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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#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 on x64 systems with GCC and CLANG (Mac, Linux) -- this is really fast as long as locking durations are very short
class Mutex
{
public:
Mutex() :
nextTicket(0),
nowServing(0)
{
}
inline void lock() const
{
const uint16_t myTicket = __sync_fetch_and_add(&(const_cast<Mutex *>(this)->nextTicket),1);
while (nowServing != myTicket) {
__asm__ __volatile__("rep;nop"::);
__asm__ __volatile__("":::"memory");
}
}
inline void unlock() const
{
++(const_cast<Mutex *>(this)->nowServing);
}
/**
* Uses C++ contexts and constructor/destructor to lock/unlock automatically
*/
class Lock
{
public:
Lock(Mutex &m) :
_m(&m)
{
m.lock();
}
Lock(const Mutex &m) :
_m(const_cast<Mutex *>(&m))
{
_m->lock();
}
~Lock()
{
_m->unlock();
}
private:
Mutex *const _m;
};
private:
Mutex(const Mutex &) {}
const Mutex &operator=(const Mutex &) { return *this; }
uint16_t nextTicket;
uint16_t nowServing;
};
#else
// libpthread based mutex lock
class Mutex
{
public:
Mutex()
{
pthread_mutex_init(&_mh,(const pthread_mutexattr_t *)0);
}
~Mutex()
{
pthread_mutex_destroy(&_mh);
}
inline void lock() const
{
pthread_mutex_lock(&((const_cast <Mutex *> (this))->_mh));
}
inline void unlock() const
{
pthread_mutex_unlock(&((const_cast <Mutex *> (this))->_mh));
}
class Lock
{
public:
Lock(Mutex &m) :
_m(&m)
{
m.lock();
}
Lock(const Mutex &m) :
_m(const_cast<Mutex *>(&m))
{
_m->lock();
}
~Lock()
{
_m->unlock();
}
private:
Mutex *const _m;
};
private:
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:
Mutex()
{
InitializeCriticalSection(&_cs);
}
~Mutex()
{
DeleteCriticalSection(&_cs);
}
inline void lock()
{
EnterCriticalSection(&_cs);
}
inline void unlock()
{
LeaveCriticalSection(&_cs);
}
inline void lock() const
{
(const_cast <Mutex *> (this))->lock();
}
inline void unlock() const
{
(const_cast <Mutex *> (this))->unlock();
}
class Lock
{
public:
Lock(Mutex &m) :
_m(&m)
{
m.lock();
}
Lock(const Mutex &m) :
_m(const_cast<Mutex *>(&m))
{
_m->lock();
}
~Lock()
{
_m->unlock();
}
private:
Mutex *const _m;
};
private:
Mutex(const Mutex &) {}
const Mutex &operator=(const Mutex &) { return *this; }
CRITICAL_SECTION _cs;
};
} // namespace ZeroTier
#endif // _WIN32
#endif
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