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78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/*
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PURPOSE:
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(Trick Sys Threads implementation)
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*/
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#ifndef SYSTHREAD_HH
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#define SYSTHREAD_HH
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#include <stdio.h>
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#include <pthread.h>
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#include <iostream>
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#include <string>
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#include <vector>
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#if __linux
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#include <sys/types.h>
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#endif
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#include <unistd.h>
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#include <sched.h>
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#include "trick/ThreadBase.hh"
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namespace Trick {
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/**
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* The purpose of this class is to ensure safe shutdown for Trick system threads, since user threads are handled separately in
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* the Trick::Threads and Executive classes.
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*
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* This class was implemented as a solution to issue https://github.com/nasa/trick/issues/1445
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*
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* @author Jackie Deans
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*
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*
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**/
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class SysThread : public Trick::ThreadBase {
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public:
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SysThread(std::string in_name);
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~SysThread();
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static int ensureAllShutdown();
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protected:
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// Called from the main thread
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void force_thread_to_pause();
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// Called from the main thread
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void unpause_thread();
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// Called from the sys_thread at a point that would be appropriate to pause
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void test_pause();
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private:
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/** Synchronization to safely pause and restart processing during a checkpoint reload */
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pthread_mutex_t _restart_pause_mutex ; /**< trick_io(**) */
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// For the main thread to tell the sys_thread to pause
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bool _thread_should_pause; /**< trick_io(**) */
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// For the main thread to tell the sys_thread to wake up
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pthread_cond_t _thread_wakeup_cv; /**< trick_io(**) */
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// For the main thread to wait for the sys_thread to pause
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pthread_cond_t _thread_has_paused_cv; /**< trick_io(**) */
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bool _thread_has_paused; /**< trick_io(**) */
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// Had to use Construct On First Use here to avoid the static initialziation fiasco
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static pthread_mutex_t& list_mutex();
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static pthread_cond_t& list_empty_cv();
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static std::vector <SysThread *>& all_sys_threads();
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static bool shutdown_finished;
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} ;
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}
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#endif
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