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#pragma once
/**
@file
@brief mutex
@author MITSUNARI Shigeo(@herumi)
@author MITSUNARI Shigeo
*/
#ifdef _WIN32
#include <windows.h>
#else
#include <pthread.h>
#include <time.h>
#endif
#include <assert.h>
#include <stdlib.h>
namespace cybozu {
class ConditionVariable;
namespace thread {
#ifdef _WIN32
typedef HANDLE MutexHandle;
inline void MutexInit(MutexHandle& mutex)
{
// mutex = CreateSemaphore(NULL /* no security */, 1 /* init */, 0x7FFFFFFF /* max */, NULL /* no name */);
mutex = CreateMutex(NULL /* no security */, FALSE /* no owner */, NULL /* no name */);
}
inline void MutexLock(MutexHandle& mutex) { WaitForSingleObject(mutex, INFINITE); }
/*
return false if timeout
@param msec [in] msec
*/
inline bool MutexLockTimeout(MutexHandle& mutex, int msec)
{
DWORD ret = WaitForSingleObject(mutex, msec);
if (ret == WAIT_OBJECT_0) {
return true;
}
if (ret == WAIT_TIMEOUT) {
return false;
}
/* ret == WAIT_ABANDONED */
assert(0);
return false;
}
inline void MutexUnlock(MutexHandle& mutex)
{
// ReleaseSemaphore(mutex, 1, NULL);
ReleaseMutex(mutex);
}
inline void MutexTerm(MutexHandle& mutex) { CloseHandle(mutex); }
#else
typedef pthread_mutex_t MutexHandle;
inline void MutexInit(MutexHandle& mutex)
{
#if 1
pthread_mutex_init(&mutex, NULL);
#else
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_TIMED_NP)) {
perror("pthread_mutexattr_settype");
exit(1);
}
pthread_mutex_init(&mutex, &attr);
pthread_mutexattr_destroy(&attr);
#endif
}
inline void MutexLock(MutexHandle& mutex) { pthread_mutex_lock(&mutex); }
#if 0
inline bool MutexLockTimeout(MutexHandle& mutex, int msec)
{
timespec absTime;
clock_gettime(CLOCK_REALTIME, &absTime);
absTime.tv_sec += msec / 1000;
absTime.tv_nsec += msec % 1000;
bool ret = pthread_mutex_timedlock(&mutex, &absTime) == 0;
return ret;
}
#endif
inline void MutexUnlock(MutexHandle& mutex) { pthread_mutex_unlock(&mutex); }
inline void MutexTerm(MutexHandle& mutex) { pthread_mutex_destroy(&mutex); }
#endif
template<class T>
class AutoLockT {
public:
explicit AutoLockT(T &t)
: t_(t)
{
t_.lock();
}
~AutoLockT()
{
t_.unlock();
}
private:
T& t_;
AutoLockT& operator=(const AutoLockT&);
};
} // cybozu::thread
class Mutex {
friend class cybozu::ConditionVariable;
public:
Mutex()
{
thread::MutexInit(hdl_);
}
~Mutex()
{
thread::MutexTerm(hdl_);
}
void lock()
{
thread::MutexLock(hdl_);
}
#if 0
bool lockTimeout(int msec)
{
return thread::MutexLockTimeout(hdl_, msec);
}
#endif
void unlock()
{
thread::MutexUnlock(hdl_);
}
private:
Mutex(const Mutex&);
Mutex& operator=(const Mutex&);
thread::MutexHandle hdl_;
};
typedef cybozu::thread::AutoLockT<cybozu::Mutex> AutoLock;
} // cybozu
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