mirror of
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1413 lines
45 KiB
C
1413 lines
45 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief General Asterisk channel locking definitions.
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*
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* - See \ref LockDef
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*/
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/*! \page LockDef Asterisk thread locking models
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*
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* This file provides different implementation of the functions,
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* depending on the platform, the use of DEBUG_THREADS, and the way
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* module-level mutexes are initialized.
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*
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* - \b static: the mutex is assigned the value AST_MUTEX_INIT_VALUE
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* this is done at compile time, and is the way used on Linux.
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* This method is not applicable to all platforms e.g. when the
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* initialization needs that some code is run.
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*
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* - \b through constructors: for each mutex, a constructor function is
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* defined, which then runs when the program (or the module)
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* starts. The problem with this approach is that there is a
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* lot of code duplication (a new block of code is created for
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* each mutex). Also, it does not prevent a user from declaring
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* a global mutex without going through the wrapper macros,
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* so sane programming practices are still required.
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*/
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#ifndef _ASTERISK_LOCK_H
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#define _ASTERISK_LOCK_H
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#include <pthread.h>
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#include <netdb.h>
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#include <time.h>
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#include <sys/param.h>
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#include <unistd.h>
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#ifndef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
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#include "asterisk/time.h"
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#endif
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#include "asterisk/logger.h"
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#include "asterisk/compiler.h"
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/* internal macro to profile mutexes. Only computes the delay on
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* non-blocking calls.
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*/
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#ifndef HAVE_MTX_PROFILE
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#define __MTX_PROF(a) return pthread_mutex_lock((a))
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#else
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#define __MTX_PROF(a) do { \
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int i; \
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/* profile only non-blocking events */ \
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ast_mark(mtx_prof, 1); \
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i = pthread_mutex_trylock((a)); \
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ast_mark(mtx_prof, 0); \
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if (!i) \
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return i; \
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else \
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return pthread_mutex_lock((a)); \
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} while (0)
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#endif /* HAVE_MTX_PROFILE */
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#define AST_PTHREADT_NULL (pthread_t) -1
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#define AST_PTHREADT_STOP (pthread_t) -2
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#if defined(SOLARIS) || defined(BSD)
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#define AST_MUTEX_INIT_W_CONSTRUCTORS
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#endif /* SOLARIS || BSD */
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/* Asterisk REQUIRES recursive (not error checking) mutexes
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and will not run without them. */
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#if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
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#define PTHREAD_MUTEX_INIT_VALUE PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
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#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE_NP
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#else
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#define PTHREAD_MUTEX_INIT_VALUE PTHREAD_MUTEX_INITIALIZER
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#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE
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#endif /* PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP */
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#ifdef DEBUG_THREADS
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#define __ast_mutex_logger(...) do { if (canlog) ast_log(LOG_ERROR, __VA_ARGS__); else fprintf(stderr, __VA_ARGS__); } while (0)
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#ifdef THREAD_CRASH
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#define DO_THREAD_CRASH do { *((int *)(0)) = 1; } while(0)
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#else
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#define DO_THREAD_CRASH do { } while (0)
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#endif
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#define AST_MUTEX_INIT_VALUE { PTHREAD_MUTEX_INIT_VALUE, 1, { NULL }, { 0 }, 0, { NULL }, { 0 }, PTHREAD_MUTEX_INIT_VALUE }
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#define AST_MUTEX_INIT_VALUE_NOTRACKING \
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{ PTHREAD_MUTEX_INIT_VALUE, 0, { NULL }, { 0 }, 0, { NULL }, { 0 }, PTHREAD_MUTEX_INIT_VALUE }
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#define AST_MAX_REENTRANCY 10
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struct ast_mutex_info {
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pthread_mutex_t mutex;
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/*! Track which thread holds this lock */
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unsigned int track:1;
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const char *file[AST_MAX_REENTRANCY];
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int lineno[AST_MAX_REENTRANCY];
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int reentrancy;
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const char *func[AST_MAX_REENTRANCY];
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pthread_t thread[AST_MAX_REENTRANCY];
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pthread_mutex_t reentr_mutex;
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};
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typedef struct ast_mutex_info ast_mutex_t;
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typedef pthread_cond_t ast_cond_t;
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static pthread_mutex_t empty_mutex;
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enum ast_lock_type {
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AST_MUTEX,
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AST_RDLOCK,
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AST_WRLOCK,
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};
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/*!
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* \brief Store lock info for the current thread
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*
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* This function gets called in ast_mutex_lock() and ast_mutex_trylock() so
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* that information about this lock can be stored in this thread's
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* lock info struct. The lock is marked as pending as the thread is waiting
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* on the lock. ast_mark_lock_acquired() will mark it as held by this thread.
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*/
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#if !defined(LOW_MEMORY)
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void ast_store_lock_info(enum ast_lock_type type, const char *filename,
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int line_num, const char *func, const char *lock_name, void *lock_addr);
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#else
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#define ast_store_lock_info(I,DONT,CARE,ABOUT,THE,PARAMETERS)
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#endif
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/*!
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* \brief Mark the last lock as acquired
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*/
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#if !defined(LOW_MEMORY)
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void ast_mark_lock_acquired(void *lock_addr);
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#else
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#define ast_mark_lock_acquired(ignore)
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#endif
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/*!
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* \brief Mark the last lock as failed (trylock)
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*/
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#if !defined(LOW_MEMORY)
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void ast_mark_lock_failed(void *lock_addr);
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#else
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#define ast_mark_lock_failed(ignore)
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#endif
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/*!
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* \brief remove lock info for the current thread
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*
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* this gets called by ast_mutex_unlock so that information on the lock can
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* be removed from the current thread's lock info struct.
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*/
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#if !defined(LOW_MEMORY)
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void ast_remove_lock_info(void *lock_addr);
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#else
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#define ast_remove_lock_info(ignore)
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#endif
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/*!
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* \brief retrieve lock info for the specified mutex
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*
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* this gets called during deadlock avoidance, so that the information may
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* be preserved as to what location originally acquired the lock.
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*/
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#if !defined(LOW_MEMORY)
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int ast_find_lock_info(void *lock_addr, char *filename, size_t filename_size, int *lineno, char *func, size_t func_size, char *mutex_name, size_t mutex_name_size);
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#else
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#define ast_find_lock_info(a,b,c,d,e,f,g,h) -1
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#endif
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/*!
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* \brief Unlock a lock briefly
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*
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* used during deadlock avoidance, to preserve the original location where
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* a lock was originally acquired.
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*/
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#define DEADLOCK_AVOIDANCE(lock) \
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do { \
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char __filename[80], __func[80], __mutex_name[80]; \
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int __lineno; \
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int __res2, __res = ast_find_lock_info(lock, __filename, sizeof(__filename), &__lineno, __func, sizeof(__func), __mutex_name, sizeof(__mutex_name)); \
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__res2 = ast_mutex_unlock(lock); \
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usleep(1); \
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if (__res < 0) { /* Shouldn't ever happen, but just in case... */ \
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if (__res2 == 0) { \
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ast_mutex_lock(lock); \
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} else { \
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ast_log(LOG_WARNING, "Could not unlock mutex '%s': %s and no lock info found! I will NOT try to relock.\n", #lock, strerror(__res2)); \
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} \
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} else { \
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if (__res2 == 0) { \
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__ast_pthread_mutex_lock(__filename, __lineno, __func, __mutex_name, lock); \
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} else { \
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ast_log(LOG_WARNING, "Could not unlock mutex '%s': %s. {{{Originally locked at %s line %d: (%s) '%s'}}} I will NOT try to relock.\n", #lock, strerror(__res2), __filename, __lineno, __func, __mutex_name); \
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} \
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} \
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} while (0)
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static void __attribute__((constructor)) init_empty_mutex(void)
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{
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memset(&empty_mutex, 0, sizeof(empty_mutex));
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}
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static inline void ast_reentrancy_lock(ast_mutex_t *p_ast_mutex)
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{
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pthread_mutex_lock(&p_ast_mutex->reentr_mutex);
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}
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static inline void ast_reentrancy_unlock(ast_mutex_t *p_ast_mutex)
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{
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pthread_mutex_unlock(&p_ast_mutex->reentr_mutex);
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}
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static inline void ast_reentrancy_init(ast_mutex_t *p_ast_mutex)
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{
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int i;
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pthread_mutexattr_t reentr_attr;
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for (i = 0; i < AST_MAX_REENTRANCY; i++) {
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p_ast_mutex->file[i] = NULL;
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p_ast_mutex->lineno[i] = 0;
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p_ast_mutex->func[i] = NULL;
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p_ast_mutex->thread[i] = 0;
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}
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p_ast_mutex->reentrancy = 0;
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pthread_mutexattr_init(&reentr_attr);
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pthread_mutexattr_settype(&reentr_attr, AST_MUTEX_KIND);
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pthread_mutex_init(&p_ast_mutex->reentr_mutex, &reentr_attr);
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pthread_mutexattr_destroy(&reentr_attr);
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}
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static inline void delete_reentrancy_cs(ast_mutex_t * p_ast_mutex)
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{
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pthread_mutex_destroy(&p_ast_mutex->reentr_mutex);
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}
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static inline int __ast_pthread_mutex_init(int track, const char *filename, int lineno, const char *func,
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const char *mutex_name, ast_mutex_t *t)
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{
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int res;
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pthread_mutexattr_t attr;
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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if ((t->mutex) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
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/*
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int canlog = strcmp(filename, "logger.c") & track;
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__ast_mutex_logger("%s line %d (%s): NOTICE: mutex '%s' is already initialized.\n",
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filename, lineno, func, mutex_name);
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DO_THREAD_CRASH;
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*/
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return 0;
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}
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#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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ast_reentrancy_init(t);
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t->track = track;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, AST_MUTEX_KIND);
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res = pthread_mutex_init(&t->mutex, &attr);
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pthread_mutexattr_destroy(&attr);
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return res;
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}
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#define ast_mutex_init(pmutex) __ast_pthread_mutex_init(1, __FILE__, __LINE__, __PRETTY_FUNCTION__, #pmutex, pmutex)
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#define ast_mutex_init_notracking(pmutex) \
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__ast_pthread_mutex_init(0, __FILE__, __LINE__, __PRETTY_FUNCTION__, #pmutex, pmutex)
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#define ROFFSET ((t->reentrancy > 0) ? (t->reentrancy-1) : 0)
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static inline int __ast_pthread_mutex_destroy(const char *filename, int lineno, const char *func,
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const char *mutex_name, ast_mutex_t *t)
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{
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int res;
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int canlog = strcmp(filename, "logger.c") & t->track;
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
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/* Don't try to uninitialize non initialized mutex
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* This may no effect on linux
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* And always ganerate core on *BSD with
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* linked libpthread
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* This not error condition if the mutex created on the fly.
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*/
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__ast_mutex_logger("%s line %d (%s): NOTICE: mutex '%s' is uninitialized.\n",
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filename, lineno, func, mutex_name);
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return 0;
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}
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#endif
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res = pthread_mutex_trylock(&t->mutex);
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switch (res) {
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case 0:
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pthread_mutex_unlock(&t->mutex);
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break;
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case EINVAL:
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__ast_mutex_logger("%s line %d (%s): Error: attempt to destroy invalid mutex '%s'.\n",
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filename, lineno, func, mutex_name);
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break;
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case EBUSY:
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__ast_mutex_logger("%s line %d (%s): Error: attempt to destroy locked mutex '%s'.\n",
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filename, lineno, func, mutex_name);
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ast_reentrancy_lock(t);
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__ast_mutex_logger("%s line %d (%s): Error: '%s' was locked here.\n",
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t->file[ROFFSET], t->lineno[ROFFSET], t->func[ROFFSET], mutex_name);
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ast_reentrancy_unlock(t);
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break;
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}
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if ((res = pthread_mutex_destroy(&t->mutex)))
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__ast_mutex_logger("%s line %d (%s): Error destroying mutex %s: %s\n",
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filename, lineno, func, mutex_name, strerror(res));
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ast_reentrancy_lock(t);
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t->file[0] = filename;
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t->lineno[0] = lineno;
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t->func[0] = func;
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t->reentrancy = 0;
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t->thread[0] = 0;
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ast_reentrancy_unlock(t);
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delete_reentrancy_cs(t);
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return res;
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}
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static inline int __ast_pthread_mutex_lock(const char *filename, int lineno, const char *func,
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const char* mutex_name, ast_mutex_t *t)
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{
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int res;
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int canlog = strcmp(filename, "logger.c") & t->track;
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
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/* Don't warn abount uninitialized mutex.
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* Simple try to initialize it.
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* May be not needed in linux system.
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*/
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res = __ast_pthread_mutex_init(t->track, filename, lineno, func, mutex_name, t);
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if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
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__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
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filename, lineno, func, mutex_name);
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return res;
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}
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}
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#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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if (t->track)
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ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, &t->mutex);
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#ifdef DETECT_DEADLOCKS
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{
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time_t seconds = time(NULL);
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time_t wait_time, reported_wait = 0;
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do {
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#ifdef HAVE_MTX_PROFILE
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ast_mark(mtx_prof, 1);
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#endif
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res = pthread_mutex_trylock(&t->mutex);
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#ifdef HAVE_MTX_PROFILE
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ast_mark(mtx_prof, 0);
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#endif
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if (res == EBUSY) {
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wait_time = time(NULL) - seconds;
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if (wait_time > reported_wait && (wait_time % 5) == 0) {
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__ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for mutex '%s'?\n",
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filename, lineno, func, (int) wait_time, mutex_name);
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ast_reentrancy_lock(t);
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__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
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t->file[ROFFSET], t->lineno[ROFFSET],
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t->func[ROFFSET], mutex_name);
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ast_reentrancy_unlock(t);
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reported_wait = wait_time;
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}
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usleep(200);
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}
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} while (res == EBUSY);
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}
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#else
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#ifdef HAVE_MTX_PROFILE
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ast_mark(mtx_prof, 1);
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res = pthread_mutex_trylock(&t->mutex);
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ast_mark(mtx_prof, 0);
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if (res)
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#endif
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res = pthread_mutex_lock(&t->mutex);
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#endif /* DETECT_DEADLOCKS */
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if (!res) {
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ast_reentrancy_lock(t);
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if (t->reentrancy < AST_MAX_REENTRANCY) {
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t->file[t->reentrancy] = filename;
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t->lineno[t->reentrancy] = lineno;
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t->func[t->reentrancy] = func;
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t->thread[t->reentrancy] = pthread_self();
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t->reentrancy++;
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} else {
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__ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
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filename, lineno, func, mutex_name);
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}
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ast_reentrancy_unlock(t);
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if (t->track)
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ast_mark_lock_acquired(&t->mutex);
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} else {
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if (t->track)
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ast_remove_lock_info(&t->mutex);
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__ast_mutex_logger("%s line %d (%s): Error obtaining mutex: %s\n",
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filename, lineno, func, strerror(res));
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DO_THREAD_CRASH;
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}
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return res;
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}
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static inline int __ast_pthread_mutex_trylock(const char *filename, int lineno, const char *func,
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const char* mutex_name, ast_mutex_t *t) attribute_warn_unused_result;
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static inline int __ast_pthread_mutex_trylock(const char *filename, int lineno, const char *func,
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const char* mutex_name, ast_mutex_t *t)
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{
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int res;
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int canlog = strcmp(filename, "logger.c") & t->track;
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|
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
/* Don't warn abount uninitialized mutex.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_pthread_mutex_init(t->track, filename, lineno, func, mutex_name, t);
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
|
|
filename, lineno, func, mutex_name);
|
|
return res;
|
|
}
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
if (t->track)
|
|
ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, &t->mutex);
|
|
|
|
if (!(res = pthread_mutex_trylock(&t->mutex))) {
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = filename;
|
|
t->lineno[t->reentrancy] = lineno;
|
|
t->func[t->reentrancy] = func;
|
|
t->thread[t->reentrancy] = pthread_self();
|
|
t->reentrancy++;
|
|
} else {
|
|
__ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
if (t->track)
|
|
ast_mark_lock_acquired(&t->mutex);
|
|
} else if (t->track) {
|
|
ast_mark_lock_failed(&t->mutex);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline int __ast_pthread_mutex_unlock(const char *filename, int lineno, const char *func,
|
|
const char *mutex_name, ast_mutex_t *t)
|
|
{
|
|
int res;
|
|
int canlog = strcmp(filename, "logger.c") & t->track;
|
|
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
|
|
filename, lineno, func, mutex_name);
|
|
res = __ast_pthread_mutex_init(t->track, filename, lineno, func, mutex_name, t);
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
return res;
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy && (t->thread[ROFFSET] != pthread_self())) {
|
|
__ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
|
|
filename, lineno, func, mutex_name);
|
|
__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
|
|
t->file[ROFFSET], t->lineno[ROFFSET], t->func[ROFFSET], mutex_name);
|
|
DO_THREAD_CRASH;
|
|
}
|
|
|
|
if (--t->reentrancy < 0) {
|
|
__ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n",
|
|
filename, lineno, func, mutex_name);
|
|
t->reentrancy = 0;
|
|
}
|
|
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = NULL;
|
|
t->lineno[t->reentrancy] = 0;
|
|
t->func[t->reentrancy] = NULL;
|
|
t->thread[t->reentrancy] = 0;
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
|
|
if (t->track)
|
|
ast_remove_lock_info(&t->mutex);
|
|
|
|
if ((res = pthread_mutex_unlock(&t->mutex))) {
|
|
__ast_mutex_logger("%s line %d (%s): Error releasing mutex: %s\n",
|
|
filename, lineno, func, strerror(res));
|
|
DO_THREAD_CRASH;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline int __ast_cond_init(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, ast_cond_t *cond, pthread_condattr_t *cond_attr)
|
|
{
|
|
return pthread_cond_init(cond, cond_attr);
|
|
}
|
|
|
|
static inline int __ast_cond_signal(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_signal(cond);
|
|
}
|
|
|
|
static inline int __ast_cond_broadcast(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_broadcast(cond);
|
|
}
|
|
|
|
static inline int __ast_cond_destroy(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_destroy(cond);
|
|
}
|
|
|
|
static inline int __ast_cond_wait(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, const char *mutex_name,
|
|
ast_cond_t *cond, ast_mutex_t *t)
|
|
{
|
|
int res;
|
|
int canlog = strcmp(filename, "logger.c") & t->track;
|
|
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
|
|
filename, lineno, func, mutex_name);
|
|
res = __ast_pthread_mutex_init(t->track, filename, lineno, func, mutex_name, t);
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
return res;
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy && (t->thread[ROFFSET] != pthread_self())) {
|
|
__ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
|
|
filename, lineno, func, mutex_name);
|
|
__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
|
|
t->file[ROFFSET], t->lineno[ROFFSET], t->func[ROFFSET], mutex_name);
|
|
DO_THREAD_CRASH;
|
|
}
|
|
|
|
if (--t->reentrancy < 0) {
|
|
__ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n",
|
|
filename, lineno, func, mutex_name);
|
|
t->reentrancy = 0;
|
|
}
|
|
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = NULL;
|
|
t->lineno[t->reentrancy] = 0;
|
|
t->func[t->reentrancy] = NULL;
|
|
t->thread[t->reentrancy] = 0;
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
|
|
if (t->track)
|
|
ast_remove_lock_info(&t->mutex);
|
|
|
|
if ((res = pthread_cond_wait(cond, &t->mutex))) {
|
|
__ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n",
|
|
filename, lineno, func, strerror(res));
|
|
DO_THREAD_CRASH;
|
|
} else {
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = filename;
|
|
t->lineno[t->reentrancy] = lineno;
|
|
t->func[t->reentrancy] = func;
|
|
t->thread[t->reentrancy] = pthread_self();
|
|
t->reentrancy++;
|
|
} else {
|
|
__ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
|
|
if (t->track)
|
|
ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, &t->mutex);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline int __ast_cond_timedwait(const char *filename, int lineno, const char *func,
|
|
const char *cond_name, const char *mutex_name, ast_cond_t *cond,
|
|
ast_mutex_t *t, const struct timespec *abstime)
|
|
{
|
|
int res;
|
|
int canlog = strcmp(filename, "logger.c") & t->track;
|
|
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
|
|
filename, lineno, func, mutex_name);
|
|
res = __ast_pthread_mutex_init(t->track, filename, lineno, func, mutex_name, t);
|
|
if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
return res;
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy && (t->thread[ROFFSET] != pthread_self())) {
|
|
__ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
|
|
filename, lineno, func, mutex_name);
|
|
__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
|
|
t->file[ROFFSET], t->lineno[ROFFSET], t->func[ROFFSET], mutex_name);
|
|
DO_THREAD_CRASH;
|
|
}
|
|
|
|
if (--t->reentrancy < 0) {
|
|
__ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n",
|
|
filename, lineno, func, mutex_name);
|
|
t->reentrancy = 0;
|
|
}
|
|
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = NULL;
|
|
t->lineno[t->reentrancy] = 0;
|
|
t->func[t->reentrancy] = NULL;
|
|
t->thread[t->reentrancy] = 0;
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
|
|
if (t->track)
|
|
ast_remove_lock_info(&t->mutex);
|
|
|
|
if ((res = pthread_cond_timedwait(cond, &t->mutex, abstime)) && (res != ETIMEDOUT)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n",
|
|
filename, lineno, func, strerror(res));
|
|
DO_THREAD_CRASH;
|
|
} else {
|
|
ast_reentrancy_lock(t);
|
|
if (t->reentrancy < AST_MAX_REENTRANCY) {
|
|
t->file[t->reentrancy] = filename;
|
|
t->lineno[t->reentrancy] = lineno;
|
|
t->func[t->reentrancy] = func;
|
|
t->thread[t->reentrancy] = pthread_self();
|
|
t->reentrancy++;
|
|
} else {
|
|
__ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
|
|
filename, lineno, func, mutex_name);
|
|
}
|
|
ast_reentrancy_unlock(t);
|
|
|
|
if (t->track)
|
|
ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, &t->mutex);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#define ast_mutex_destroy(a) __ast_pthread_mutex_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a)
|
|
#define ast_mutex_lock(a) __ast_pthread_mutex_lock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a)
|
|
#define ast_mutex_unlock(a) __ast_pthread_mutex_unlock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a)
|
|
#define ast_mutex_trylock(a) __ast_pthread_mutex_trylock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a)
|
|
#define ast_cond_init(cond, attr) __ast_cond_init(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond, attr)
|
|
#define ast_cond_destroy(cond) __ast_cond_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond)
|
|
#define ast_cond_signal(cond) __ast_cond_signal(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond)
|
|
#define ast_cond_broadcast(cond) __ast_cond_broadcast(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond)
|
|
#define ast_cond_wait(cond, mutex) __ast_cond_wait(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, #mutex, cond, mutex)
|
|
#define ast_cond_timedwait(cond, mutex, time) __ast_cond_timedwait(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, #mutex, cond, mutex, time)
|
|
|
|
#else /* !DEBUG_THREADS */
|
|
|
|
#define DEADLOCK_AVOIDANCE(lock) \
|
|
do { \
|
|
int __res; \
|
|
if (!(__res = ast_mutex_unlock(lock))) { \
|
|
usleep(1); \
|
|
ast_mutex_lock(lock); \
|
|
} else { \
|
|
ast_log(LOG_WARNING, "Failed to unlock mutex '%s' (%s). I will NOT try to relock. {{{ THIS IS A BUG. }}}\n", #lock, strerror(__res)); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
typedef pthread_mutex_t ast_mutex_t;
|
|
|
|
#define AST_MUTEX_INIT_VALUE ((ast_mutex_t) PTHREAD_MUTEX_INIT_VALUE)
|
|
#define AST_MUTEX_INIT_VALUE_NOTRACKING \
|
|
((ast_mutex_t) PTHREAD_MUTEX_INIT_VALUE)
|
|
|
|
#define ast_mutex_init_notracking(m) ast_mutex_init(m)
|
|
|
|
static inline int ast_mutex_init(ast_mutex_t *pmutex)
|
|
{
|
|
int res;
|
|
pthread_mutexattr_t attr;
|
|
|
|
pthread_mutexattr_init(&attr);
|
|
pthread_mutexattr_settype(&attr, AST_MUTEX_KIND);
|
|
|
|
res = pthread_mutex_init(pmutex, &attr);
|
|
pthread_mutexattr_destroy(&attr);
|
|
return res;
|
|
}
|
|
|
|
#define ast_pthread_mutex_init(pmutex,a) pthread_mutex_init(pmutex,a)
|
|
|
|
static inline int ast_mutex_unlock(ast_mutex_t *pmutex)
|
|
{
|
|
return pthread_mutex_unlock(pmutex);
|
|
}
|
|
|
|
static inline int ast_mutex_destroy(ast_mutex_t *pmutex)
|
|
{
|
|
return pthread_mutex_destroy(pmutex);
|
|
}
|
|
|
|
static inline int ast_mutex_lock(ast_mutex_t *pmutex)
|
|
{
|
|
__MTX_PROF(pmutex);
|
|
}
|
|
|
|
static inline int ast_mutex_trylock(ast_mutex_t *pmutex)
|
|
{
|
|
return pthread_mutex_trylock(pmutex);
|
|
}
|
|
|
|
typedef pthread_cond_t ast_cond_t;
|
|
|
|
static inline int ast_cond_init(ast_cond_t *cond, pthread_condattr_t *cond_attr)
|
|
{
|
|
return pthread_cond_init(cond, cond_attr);
|
|
}
|
|
|
|
static inline int ast_cond_signal(ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_signal(cond);
|
|
}
|
|
|
|
static inline int ast_cond_broadcast(ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_broadcast(cond);
|
|
}
|
|
|
|
static inline int ast_cond_destroy(ast_cond_t *cond)
|
|
{
|
|
return pthread_cond_destroy(cond);
|
|
}
|
|
|
|
static inline int ast_cond_wait(ast_cond_t *cond, ast_mutex_t *t)
|
|
{
|
|
return pthread_cond_wait(cond, t);
|
|
}
|
|
|
|
static inline int ast_cond_timedwait(ast_cond_t *cond, ast_mutex_t *t, const struct timespec *abstime)
|
|
{
|
|
return pthread_cond_timedwait(cond, t, abstime);
|
|
}
|
|
|
|
#endif /* !DEBUG_THREADS */
|
|
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
|
|
/* If AST_MUTEX_INIT_W_CONSTRUCTORS is defined, use file scope
|
|
destructors to destroy mutexes and create it on the fly. */
|
|
#define __AST_MUTEX_DEFINE(scope, mutex, init_val, track) \
|
|
scope ast_mutex_t mutex = init_val; \
|
|
static void __attribute__((constructor)) init_##mutex(void) \
|
|
{ \
|
|
if (track) \
|
|
ast_mutex_init(&mutex); \
|
|
else \
|
|
ast_mutex_init_notracking(&mutex); \
|
|
} \
|
|
static void __attribute__((destructor)) fini_##mutex(void) \
|
|
{ \
|
|
ast_mutex_destroy(&mutex); \
|
|
}
|
|
#else /* !AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
/* By default, use static initialization of mutexes. */
|
|
#define __AST_MUTEX_DEFINE(scope, mutex, init_val, track) \
|
|
scope ast_mutex_t mutex = init_val
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
#define pthread_mutex_t use_ast_mutex_t_instead_of_pthread_mutex_t
|
|
#define pthread_mutex_lock use_ast_mutex_lock_instead_of_pthread_mutex_lock
|
|
#define pthread_mutex_unlock use_ast_mutex_unlock_instead_of_pthread_mutex_unlock
|
|
#define pthread_mutex_trylock use_ast_mutex_trylock_instead_of_pthread_mutex_trylock
|
|
#define pthread_mutex_init use_ast_mutex_init_instead_of_pthread_mutex_init
|
|
#define pthread_mutex_destroy use_ast_mutex_destroy_instead_of_pthread_mutex_destroy
|
|
#define pthread_cond_t use_ast_cond_t_instead_of_pthread_cond_t
|
|
#define pthread_cond_init use_ast_cond_init_instead_of_pthread_cond_init
|
|
#define pthread_cond_destroy use_ast_cond_destroy_instead_of_pthread_cond_destroy
|
|
#define pthread_cond_signal use_ast_cond_signal_instead_of_pthread_cond_signal
|
|
#define pthread_cond_broadcast use_ast_cond_broadcast_instead_of_pthread_cond_broadcast
|
|
#define pthread_cond_wait use_ast_cond_wait_instead_of_pthread_cond_wait
|
|
#define pthread_cond_timedwait use_ast_cond_timedwait_instead_of_pthread_cond_timedwait
|
|
|
|
#define AST_MUTEX_DEFINE_STATIC(mutex) __AST_MUTEX_DEFINE(static, mutex, AST_MUTEX_INIT_VALUE, 1)
|
|
#define AST_MUTEX_DEFINE_STATIC_NOTRACKING(mutex) __AST_MUTEX_DEFINE(static, mutex, AST_MUTEX_INIT_VALUE_NOTRACKING, 0)
|
|
|
|
#define AST_MUTEX_INITIALIZER __use_AST_MUTEX_DEFINE_STATIC_rather_than_AST_MUTEX_INITIALIZER__
|
|
|
|
#define gethostbyname __gethostbyname__is__not__reentrant__use__ast_gethostbyname__instead__
|
|
|
|
#ifndef __linux__
|
|
#define pthread_create __use_ast_pthread_create_instead__
|
|
#endif
|
|
|
|
typedef pthread_rwlock_t ast_rwlock_t;
|
|
|
|
#ifdef HAVE_PTHREAD_RWLOCK_INITIALIZER
|
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#define AST_RWLOCK_INIT_VALUE PTHREAD_RWLOCK_INITIALIZER
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#else
|
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#define AST_RWLOCK_INIT_VALUE NULL
|
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#endif
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|
|
|
#ifdef DEBUG_THREADS
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|
|
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#define ast_rwlock_init(rwlock) __ast_rwlock_init(__FILE__, __LINE__, __PRETTY_FUNCTION__, #rwlock, rwlock)
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|
|
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static inline int __ast_rwlock_init(const char *filename, int lineno, const char *func, const char *rwlock_name, ast_rwlock_t *prwlock)
|
|
{
|
|
int res;
|
|
pthread_rwlockattr_t attr;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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int canlog = strcmp(filename, "logger.c");
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|
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if (*prwlock != ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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__ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is already initialized.\n",
|
|
filename, lineno, func, rwlock_name);
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return 0;
|
|
}
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|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
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pthread_rwlockattr_init(&attr);
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|
|
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#ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
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pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP);
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#endif
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|
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res = pthread_rwlock_init(prwlock, &attr);
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pthread_rwlockattr_destroy(&attr);
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return res;
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}
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|
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#define ast_rwlock_destroy(rwlock) __ast_rwlock_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, #rwlock, rwlock)
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|
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static inline int __ast_rwlock_destroy(const char *filename, int lineno, const char *func, const char *rwlock_name, ast_rwlock_t *prwlock)
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|
{
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int res;
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|
int canlog = strcmp(filename, "logger.c");
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|
|
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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if (*prwlock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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__ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is uninitialized.\n",
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filename, lineno, func, rwlock_name);
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return 0;
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}
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#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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|
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if ((res = pthread_rwlock_destroy(prwlock)))
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__ast_mutex_logger("%s line %d (%s): Error destroying rwlock %s: %s\n",
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filename, lineno, func, rwlock_name, strerror(res));
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return res;
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}
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|
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#define ast_rwlock_unlock(a) \
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_ast_rwlock_unlock(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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static inline int _ast_rwlock_unlock(ast_rwlock_t *lock, const char *name,
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const char *file, int line, const char *func)
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{
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int res;
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#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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int canlog = strcmp(file, "logger.c");
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|
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if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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__ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is uninitialized.\n",
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file, line, func, name);
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res = __ast_rwlock_init(file, line, func, name, lock);
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if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
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|
file, line, func, name);
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|
}
|
|
return res;
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|
}
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|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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|
|
|
res = pthread_rwlock_unlock(lock);
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|
ast_remove_lock_info(lock);
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return res;
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}
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|
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#define ast_rwlock_rdlock(a) \
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_ast_rwlock_rdlock(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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|
|
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static inline int _ast_rwlock_rdlock(ast_rwlock_t *lock, const char *name,
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const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
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int canlog = strcmp(file, "logger.c");
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|
|
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if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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|
/* Don't warn abount uninitialized lock.
|
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* Simple try to initialize it.
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|
* May be not needed in linux system.
|
|
*/
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res = __ast_rwlock_init(file, line, func, name, lock);
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if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
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|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
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|
file, line, func, name);
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return res;
|
|
}
|
|
}
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|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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|
|
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ast_store_lock_info(AST_RDLOCK, file, line, func, name, lock);
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res = pthread_rwlock_rdlock(lock);
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|
if (!res)
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|
ast_mark_lock_acquired(lock);
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|
else
|
|
ast_remove_lock_info(lock);
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|
return res;
|
|
}
|
|
|
|
#define ast_rwlock_wrlock(a) \
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_ast_rwlock_wrlock(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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|
|
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static inline int _ast_rwlock_wrlock(ast_rwlock_t *lock, const char *name,
|
|
const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
int canlog = strcmp(file, "logger.c");
|
|
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
/* Don't warn abount uninitialized lock.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_rwlock_init(file, line, func, name, lock);
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
|
|
file, line, func, name);
|
|
return res;
|
|
}
|
|
}
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|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
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|
|
|
ast_store_lock_info(AST_WRLOCK, file, line, func, name, lock);
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|
res = pthread_rwlock_wrlock(lock);
|
|
if (!res)
|
|
ast_mark_lock_acquired(lock);
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|
else
|
|
ast_remove_lock_info(lock);
|
|
return res;
|
|
}
|
|
|
|
#define ast_rwlock_timedrdlock(a,b) \
|
|
_ast_rwlock_timedrdlock(a, # a, b, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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|
|
|
static inline int _ast_rwlock_timedrdlock(ast_rwlock_t *lock, const char *name,
|
|
const struct timespec *abs_timeout, const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
int canlog = strcmp(file, "logger.c");
|
|
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
/* Don't warn abount uninitialized lock.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_rwlock_init(file, line, func, name, lock);
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
|
|
file, line, func, name);
|
|
return res;
|
|
}
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_store_lock_info(AST_RDLOCK, file, line, func, name, lock);
|
|
#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
|
|
res = pthread_rwlock_timedrdlock(lock, abs_timeout);
|
|
#else
|
|
do {
|
|
struct timeval _start = ast_tvnow(), _diff;
|
|
for (;;) {
|
|
if (!(res = pthread_rwlock_tryrdlock(lock))) {
|
|
break;
|
|
}
|
|
_diff = ast_tvsub(ast_tvnow(), _start);
|
|
if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
|
|
break;
|
|
}
|
|
usleep(1);
|
|
}
|
|
} while (0);
|
|
#endif
|
|
if (!res)
|
|
ast_mark_lock_acquired(lock);
|
|
else
|
|
ast_remove_lock_info(lock);
|
|
return res;
|
|
}
|
|
|
|
#define ast_rwlock_timedwrlock(a,b) \
|
|
_ast_rwlock_timedwrlock(a, # a, b, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
|
|
static inline int _ast_rwlock_timedwrlock(ast_rwlock_t *lock, const char *name,
|
|
const struct timespec *abs_timeout, const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
int canlog = strcmp(file, "logger.c");
|
|
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
/* Don't warn abount uninitialized lock.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_rwlock_init(file, line, func, name, lock);
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
|
|
file, line, func, name);
|
|
return res;
|
|
}
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_store_lock_info(AST_WRLOCK, file, line, func, name, lock);
|
|
#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
|
|
res = pthread_rwlock_timedwrlock(lock, abs_timeout);
|
|
#else
|
|
do {
|
|
struct timeval _start = ast_tvnow(), _diff;
|
|
for (;;) {
|
|
if (!(res = pthread_rwlock_trywrlock(lock))) {
|
|
break;
|
|
}
|
|
_diff = ast_tvsub(ast_tvnow(), _start);
|
|
if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
|
|
break;
|
|
}
|
|
usleep(1);
|
|
}
|
|
} while (0);
|
|
#endif
|
|
if (!res)
|
|
ast_mark_lock_acquired(lock);
|
|
else
|
|
ast_remove_lock_info(lock);
|
|
return res;
|
|
}
|
|
|
|
#define ast_rwlock_tryrdlock(a) \
|
|
_ast_rwlock_tryrdlock(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
|
|
static inline int _ast_rwlock_tryrdlock(ast_rwlock_t *lock, const char *name,
|
|
const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
int canlog = strcmp(file, "logger.c");
|
|
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
/* Don't warn abount uninitialized lock.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_rwlock_init(file, line, func, name, lock);
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
|
|
file, line, func, name);
|
|
return res;
|
|
}
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_store_lock_info(AST_RDLOCK, file, line, func, name, lock);
|
|
res = pthread_rwlock_tryrdlock(lock);
|
|
if (!res)
|
|
ast_mark_lock_acquired(lock);
|
|
else
|
|
ast_remove_lock_info(lock);
|
|
return res;
|
|
}
|
|
|
|
#define ast_rwlock_trywrlock(a) \
|
|
_ast_rwlock_trywrlock(a, # a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
|
|
static inline int _ast_rwlock_trywrlock(ast_rwlock_t *lock, const char *name,
|
|
const char *file, int line, const char *func)
|
|
{
|
|
int res;
|
|
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
|
|
int canlog = strcmp(file, "logger.c");
|
|
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
/* Don't warn abount uninitialized lock.
|
|
* Simple try to initialize it.
|
|
* May be not needed in linux system.
|
|
*/
|
|
res = __ast_rwlock_init(file, line, func, name, lock);
|
|
if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
|
|
__ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
|
|
file, line, func, name);
|
|
return res;
|
|
}
|
|
}
|
|
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
|
|
|
|
ast_store_lock_info(AST_WRLOCK, file, line, func, name, lock);
|
|
res = pthread_rwlock_trywrlock(lock);
|
|
if (!res)
|
|
ast_mark_lock_acquired(lock);
|
|
else
|
|
ast_remove_lock_info(lock);
|
|
return res;
|
|
}
|
|
|
|
#else /* !DEBUG_THREADS */
|
|
|
|
static inline int ast_rwlock_init(ast_rwlock_t *prwlock)
|
|
{
|
|
int res;
|
|
pthread_rwlockattr_t attr;
|
|
|
|
pthread_rwlockattr_init(&attr);
|
|
|
|
#ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
|
|
pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP);
|
|
#endif
|
|
|
|
res = pthread_rwlock_init(prwlock, &attr);
|
|
pthread_rwlockattr_destroy(&attr);
|
|
return res;
|
|
}
|
|
|
|
static inline int ast_rwlock_destroy(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_destroy(prwlock);
|
|
}
|
|
|
|
static inline int ast_rwlock_unlock(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_unlock(prwlock);
|
|
}
|
|
|
|
static inline int ast_rwlock_rdlock(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_rdlock(prwlock);
|
|
}
|
|
|
|
static inline int ast_rwlock_timedrdlock(ast_rwlock_t *prwlock, const struct timespec *abs_timeout)
|
|
{
|
|
int res;
|
|
#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
|
|
res = pthread_rwlock_timedrdlock(prwlock, abs_timeout);
|
|
#else
|
|
struct timeval _start = ast_tvnow(), _diff;
|
|
for (;;) {
|
|
if (!(res = pthread_rwlock_tryrdlock(prwlock))) {
|
|
break;
|
|
}
|
|
_diff = ast_tvsub(ast_tvnow(), _start);
|
|
if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
|
|
break;
|
|
}
|
|
usleep(1);
|
|
}
|
|
#endif
|
|
return res;
|
|
}
|
|
|
|
static inline int ast_rwlock_tryrdlock(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_tryrdlock(prwlock);
|
|
}
|
|
|
|
static inline int ast_rwlock_wrlock(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_wrlock(prwlock);
|
|
}
|
|
|
|
static inline int ast_rwlock_timedwrlock(ast_rwlock_t *prwlock, const struct timespec *abs_timeout)
|
|
{
|
|
int res;
|
|
#ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
|
|
res = pthread_rwlock_timedwrlock(prwlock, abs_timeout);
|
|
#else
|
|
do {
|
|
struct timeval _start = ast_tvnow(), _diff;
|
|
for (;;) {
|
|
if (!(res = pthread_rwlock_trywrlock(prwlock))) {
|
|
break;
|
|
}
|
|
_diff = ast_tvsub(ast_tvnow(), _start);
|
|
if (_diff.tv_sec > abs_timeout->tv_sec || (_diff.tv_sec == abs_timeout->tv_sec && _diff.tv_usec * 1000 > abs_timeout->tv_nsec)) {
|
|
break;
|
|
}
|
|
usleep(1);
|
|
}
|
|
} while (0);
|
|
#endif
|
|
return res;
|
|
}
|
|
|
|
static inline int ast_rwlock_trywrlock(ast_rwlock_t *prwlock)
|
|
{
|
|
return pthread_rwlock_trywrlock(prwlock);
|
|
}
|
|
#endif /* !DEBUG_THREADS */
|
|
|
|
/* Statically declared read/write locks */
|
|
|
|
#ifndef HAVE_PTHREAD_RWLOCK_INITIALIZER
|
|
#define __AST_RWLOCK_DEFINE(scope, rwlock) \
|
|
scope ast_rwlock_t rwlock; \
|
|
static void __attribute__((constructor)) init_##rwlock(void) \
|
|
{ \
|
|
ast_rwlock_init(&rwlock); \
|
|
} \
|
|
static void __attribute__((destructor)) fini_##rwlock(void) \
|
|
{ \
|
|
ast_rwlock_destroy(&rwlock); \
|
|
}
|
|
#else
|
|
#define __AST_RWLOCK_DEFINE(scope, rwlock) \
|
|
scope ast_rwlock_t rwlock = AST_RWLOCK_INIT_VALUE
|
|
#endif
|
|
|
|
#define AST_RWLOCK_DEFINE_STATIC(rwlock) __AST_RWLOCK_DEFINE(static, rwlock)
|
|
|
|
/*
|
|
* Initial support for atomic instructions.
|
|
* For platforms that have it, use the native cpu instruction to
|
|
* implement them. For other platforms, resort to a 'slow' version
|
|
* (defined in utils.c) that protects the atomic instruction with
|
|
* a single lock.
|
|
* The slow versions is always available, for testing purposes,
|
|
* as ast_atomic_fetchadd_int_slow()
|
|
*/
|
|
|
|
int ast_atomic_fetchadd_int_slow(volatile int *p, int v);
|
|
|
|
#include "asterisk/inline_api.h"
|
|
|
|
#if defined(HAVE_OSX_ATOMICS)
|
|
#include "libkern/OSAtomic.h"
|
|
#endif
|
|
|
|
/*! \brief Atomically add v to *p and return * the previous value of *p.
|
|
* This can be used to handle reference counts, and the return value
|
|
* can be used to generate unique identifiers.
|
|
*/
|
|
|
|
#if defined(HAVE_GCC_ATOMICS)
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
return __sync_fetch_and_add(p, v);
|
|
})
|
|
#elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 4)
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
return OSAtomicAdd32(v, (int32_t *) p) - v;
|
|
})
|
|
#elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 8)
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
return OSAtomicAdd64(v, (int64_t *) p) - v;
|
|
#elif defined (__i386__)
|
|
#ifdef sun
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
__asm __volatile (
|
|
" lock; xaddl %0, %1 ; "
|
|
: "+r" (v), /* 0 (result) */
|
|
"=m" (*p) /* 1 */
|
|
: "m" (*p)); /* 2 */
|
|
return (v);
|
|
})
|
|
#else /* ifndef sun */
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
__asm __volatile (
|
|
" lock xaddl %0, %1 ; "
|
|
: "+r" (v), /* 0 (result) */
|
|
"=m" (*p) /* 1 */
|
|
: "m" (*p)); /* 2 */
|
|
return (v);
|
|
})
|
|
#endif
|
|
#else /* low performance version in utils.c */
|
|
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
|
|
{
|
|
return ast_atomic_fetchadd_int_slow(p, v);
|
|
})
|
|
#endif
|
|
|
|
/*! \brief decrement *p by 1 and return true if the variable has reached 0.
|
|
* Useful e.g. to check if a refcount has reached 0.
|
|
*/
|
|
#if defined(HAVE_GCC_ATOMICS)
|
|
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
|
|
{
|
|
return __sync_sub_and_fetch(p, 1) == 0;
|
|
})
|
|
#elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 4)
|
|
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
|
|
{
|
|
return OSAtomicAdd32( -1, (int32_t *) p) == 0;
|
|
})
|
|
#elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 8)
|
|
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
|
|
{
|
|
return OSAtomicAdd64( -1, (int64_t *) p) == 0;
|
|
#else
|
|
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
|
|
{
|
|
int a = ast_atomic_fetchadd_int(p, -1);
|
|
return a == 1; /* true if the value is 0 now (so it was 1 previously) */
|
|
})
|
|
#endif
|
|
|
|
#ifndef DEBUG_CHANNEL_LOCKS
|
|
/*! \brief Lock a channel. If DEBUG_CHANNEL_LOCKS is defined
|
|
in the Makefile, print relevant output for debugging */
|
|
#define ast_channel_lock(x) ast_mutex_lock(&x->lock)
|
|
/*! \brief Unlock a channel. If DEBUG_CHANNEL_LOCKS is defined
|
|
in the Makefile, print relevant output for debugging */
|
|
#define ast_channel_unlock(x) ast_mutex_unlock(&x->lock)
|
|
/*! \brief Try locking a channel. If DEBUG_CHANNEL_LOCKS is defined
|
|
in the Makefile, print relevant output for debugging */
|
|
#define ast_channel_trylock(x) ast_mutex_trylock(&x->lock)
|
|
#else
|
|
|
|
struct ast_channel;
|
|
|
|
#define ast_channel_lock(a) __ast_channel_lock(a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
/*! \brief Lock AST channel (and print debugging output)
|
|
\note You need to enable DEBUG_CHANNEL_LOCKS for this function */
|
|
int __ast_channel_lock(struct ast_channel *chan, const char *file, int lineno, const char *func);
|
|
|
|
#define ast_channel_unlock(a) __ast_channel_unlock(a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
/*! \brief Unlock AST channel (and print debugging output)
|
|
\note You need to enable DEBUG_CHANNEL_LOCKS for this function
|
|
*/
|
|
int __ast_channel_unlock(struct ast_channel *chan, const char *file, int lineno, const char *func);
|
|
|
|
#define ast_channel_trylock(a) __ast_channel_trylock(a, __FILE__, __LINE__, __PRETTY_FUNCTION__)
|
|
/*! \brief Lock AST channel (and print debugging output)
|
|
\note You need to enable DEBUG_CHANNEL_LOCKS for this function */
|
|
int __ast_channel_trylock(struct ast_channel *chan, const char *file, int lineno, const char *func) attribute_warn_unused_result;
|
|
#endif
|
|
|
|
#endif /* _ASTERISK_LOCK_H */
|