mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-20 05:28:01 +00:00
139 lines
3.5 KiB
C++
139 lines
3.5 KiB
C++
/*
|
|
* Copyright (c)2019 ZeroTier, Inc.
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file in the project's root directory.
|
|
*
|
|
* Change Date: 2023-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2.0 of the Apache License.
|
|
*/
|
|
/****/
|
|
|
|
#ifndef ZT_MUTEX_HPP
|
|
#define ZT_MUTEX_HPP
|
|
|
|
#include "Constants.hpp"
|
|
|
|
#ifdef __UNIX_LIKE__
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
|
|
namespace ZeroTier {
|
|
|
|
#if defined(__GNUC__) && (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__) || defined(_M_X64))
|
|
|
|
// Inline ticket lock with yield for x64 systems, provides much better performance when there is no contention.
|
|
class Mutex
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Mutex() : nextTicket(0),nowServing(0) {}
|
|
|
|
ZT_ALWAYS_INLINE void lock() const
|
|
{
|
|
const uint16_t myTicket = __sync_fetch_and_add(&(const_cast<Mutex *>(this)->nextTicket),1);
|
|
while (nowServing != myTicket) {
|
|
pthread_yield_np();
|
|
__asm__ __volatile__("rep;nop"::);
|
|
__asm__ __volatile__("":::"memory");
|
|
}
|
|
}
|
|
|
|
ZT_ALWAYS_INLINE void unlock() const { ++(const_cast<Mutex *>(this)->nowServing); }
|
|
|
|
class Lock
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
|
|
ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
|
|
ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
|
|
private:
|
|
Mutex *const _m;
|
|
};
|
|
|
|
private:
|
|
inline Mutex(const Mutex &) {}
|
|
const Mutex &operator=(const Mutex &) { return *this; }
|
|
|
|
uint16_t nextTicket;
|
|
uint16_t nowServing;
|
|
};
|
|
|
|
#else
|
|
|
|
// libpthread based mutex lock
|
|
class Mutex
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Mutex() { pthread_mutex_init(&_mh,(const pthread_mutexattr_t *)0); }
|
|
ZT_ALWAYS_INLINE ~Mutex() { pthread_mutex_destroy(&_mh); }
|
|
ZT_ALWAYS_INLINE void lock() const { pthread_mutex_lock(&((const_cast <Mutex *> (this))->_mh)); }
|
|
ZT_ALWAYS_INLINE void unlock() const { pthread_mutex_unlock(&((const_cast <Mutex *> (this))->_mh)); }
|
|
|
|
class Lock
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
|
|
ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
|
|
ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
|
|
private:
|
|
Mutex *const _m;
|
|
};
|
|
|
|
private:
|
|
inline Mutex(const Mutex &) {}
|
|
const Mutex &operator=(const Mutex &) { return *this; }
|
|
|
|
pthread_mutex_t _mh;
|
|
};
|
|
|
|
#endif
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif // Apple / Linux
|
|
|
|
#ifdef __WINDOWS__
|
|
|
|
#include <stdlib.h>
|
|
#include <Windows.h>
|
|
|
|
namespace ZeroTier {
|
|
|
|
// Windows critical section based lock
|
|
class Mutex
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Mutex() { InitializeCriticalSection(&_cs); }
|
|
ZT_ALWAYS_INLINE ~Mutex() { DeleteCriticalSection(&_cs); }
|
|
ZT_ALWAYS_INLINE void lock() { EnterCriticalSection(&_cs); }
|
|
ZT_ALWAYS_INLINE void unlock() { LeaveCriticalSection(&_cs); }
|
|
ZT_ALWAYS_INLINE void lock() const { (const_cast <Mutex *> (this))->lock(); }
|
|
ZT_ALWAYS_INLINE void unlock() const { (const_cast <Mutex *> (this))->unlock(); }
|
|
|
|
class Lock
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
|
|
ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
|
|
ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
|
|
private:
|
|
Mutex *const _m;
|
|
};
|
|
|
|
private:
|
|
inline Mutex(const Mutex &) {}
|
|
const Mutex &operator=(const Mutex &) { return *this; }
|
|
|
|
CRITICAL_SECTION _cs;
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif // _WIN32
|
|
|
|
#endif
|