mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-24 15:16:40 +00:00
138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_MUTEX_HPP
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#define ZT_MUTEX_HPP
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#include "Constants.hpp"
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#ifdef __UNIX_LIKE__
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#include <stdint.h>
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#include <stdlib.h>
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#include <pthread.h>
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namespace ZeroTier {
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#if defined(__GNUC__) && (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__) || defined(_M_X64))
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// Inline ticket lock with yield for x64 systems, provides much better performance when there is no contention.
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class Mutex
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{
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public:
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ZT_ALWAYS_INLINE Mutex() : nextTicket(0),nowServing(0) {}
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ZT_ALWAYS_INLINE void lock() const
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{
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const uint16_t myTicket = __sync_fetch_and_add(&(const_cast<Mutex *>(this)->nextTicket),1);
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while (nowServing != myTicket) {
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__asm__ __volatile__("rep;nop"::);
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__asm__ __volatile__("":::"memory");
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}
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}
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ZT_ALWAYS_INLINE void unlock() const { ++(const_cast<Mutex *>(this)->nowServing); }
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class Lock
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{
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public:
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ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
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ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
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ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
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private:
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Mutex *const _m;
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};
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private:
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inline Mutex(const Mutex &) {}
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const Mutex &operator=(const Mutex &) { return *this; }
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uint16_t nextTicket;
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uint16_t nowServing;
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};
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#else
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// libpthread based mutex lock
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class Mutex
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{
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public:
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ZT_ALWAYS_INLINE Mutex() { pthread_mutex_init(&_mh,(const pthread_mutexattr_t *)0); }
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ZT_ALWAYS_INLINE ~Mutex() { pthread_mutex_destroy(&_mh); }
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ZT_ALWAYS_INLINE void lock() const { pthread_mutex_lock(&((const_cast <Mutex *> (this))->_mh)); }
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ZT_ALWAYS_INLINE void unlock() const { pthread_mutex_unlock(&((const_cast <Mutex *> (this))->_mh)); }
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class Lock
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{
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public:
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ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
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ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
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ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
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private:
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Mutex *const _m;
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};
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private:
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inline Mutex(const Mutex &) {}
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const Mutex &operator=(const Mutex &) { return *this; }
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pthread_mutex_t _mh;
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};
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#endif
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} // namespace ZeroTier
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#endif // Apple / Linux
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#ifdef __WINDOWS__
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#include <stdlib.h>
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#include <Windows.h>
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namespace ZeroTier {
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// Windows critical section based lock
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class Mutex
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{
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public:
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ZT_ALWAYS_INLINE Mutex() { InitializeCriticalSection(&_cs); }
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ZT_ALWAYS_INLINE ~Mutex() { DeleteCriticalSection(&_cs); }
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ZT_ALWAYS_INLINE void lock() { EnterCriticalSection(&_cs); }
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ZT_ALWAYS_INLINE void unlock() { LeaveCriticalSection(&_cs); }
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ZT_ALWAYS_INLINE void lock() const { (const_cast <Mutex *> (this))->lock(); }
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ZT_ALWAYS_INLINE void unlock() const { (const_cast <Mutex *> (this))->unlock(); }
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class Lock
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{
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public:
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ZT_ALWAYS_INLINE Lock(Mutex &m) : _m(&m) { m.lock(); }
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ZT_ALWAYS_INLINE Lock(const Mutex &m) : _m(const_cast<Mutex *>(&m)) { _m->lock(); }
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ZT_ALWAYS_INLINE ~Lock() { _m->unlock(); }
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private:
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Mutex *const _m;
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};
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private:
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inline Mutex(const Mutex &) {}
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const Mutex &operator=(const Mutex &) { return *this; }
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CRITICAL_SECTION _cs;
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};
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} // namespace ZeroTier
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#endif // _WIN32
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#endif
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