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/*
* Copyright 2010-2017 Branimir Karadzic. All rights reserved.
* License: https://github.com/bkaradzic/bx#license-bsd-2-clause
*/
#include <bx/sem.h>
#if BX_CONFIG_SUPPORTS_THREADING
#if BX_PLATFORM_POSIX
# include <errno.h>
# include <semaphore.h>
# include <time.h>
# include <pthread.h>
#elif BX_PLATFORM_XBOXONE
# include <synchapi.h>
#elif BX_PLATFORM_XBOX360 || BX_PLATFORM_WINDOWS || BX_PLATFORM_WINRT
# include <windows.h>
# include <limits.h>
#endif // BX_PLATFORM_
namespace bx
{
#if BX_PLATFORM_POSIX
# if BX_CONFIG_SEMAPHORE_PTHREAD
Semaphore::Semaphore()
: m_count(0)
{
int result;
result = pthread_mutex_init(&m_mutex, NULL);
BX_CHECK(0 == result, "pthread_mutex_init %d", result);
result = pthread_cond_init(&m_cond, NULL);
BX_CHECK(0 == result, "pthread_cond_init %d", result);
BX_UNUSED(result);
}
Semaphore::~Semaphore()
{
int result;
result = pthread_cond_destroy(&m_cond);
BX_CHECK(0 == result, "pthread_cond_destroy %d", result);
result = pthread_mutex_destroy(&m_mutex);
BX_CHECK(0 == result, "pthread_mutex_destroy %d", result);
BX_UNUSED(result);
}
void Semaphore::post(uint32_t _count)
{
int result = pthread_mutex_lock(&m_mutex);
BX_CHECK(0 == result, "pthread_mutex_lock %d", result);
for (uint32_t ii = 0; ii < _count; ++ii)
{
result = pthread_cond_signal(&m_cond);
BX_CHECK(0 == result, "pthread_cond_signal %d", result);
}
m_count += _count;
result = pthread_mutex_unlock(&m_mutex);
BX_CHECK(0 == result, "pthread_mutex_unlock %d", result);
BX_UNUSED(result);
}
bool Semaphore::wait(int32_t _msecs)
{
int result = pthread_mutex_lock(&m_mutex);
BX_CHECK(0 == result, "pthread_mutex_lock %d", result);
# if BX_PLATFORM_NACL || BX_PLATFORM_OSX
BX_UNUSED(_msecs);
BX_CHECK(-1 == _msecs, "NaCl and OSX don't support pthread_cond_timedwait at this moment.");
while (0 == result
&& 0 >= m_count)
{
result = pthread_cond_wait(&m_cond, &m_mutex);
}
# elif BX_PLATFORM_IOS
if (-1 == _msecs)
{
while (0 == result
&& 0 >= m_count)
{
result = pthread_cond_wait(&m_cond, &m_mutex);
}
}
else
{
timespec ts;
ts.tv_sec = _msecs/1000;
ts.tv_nsec = (_msecs%1000)*1000;
while (0 == result
&& 0 >= m_count)
{
result = pthread_cond_timedwait_relative_np(&m_cond, &m_mutex, &ts);
}
}
# else
timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += _msecs/1000;
ts.tv_nsec += (_msecs%1000)*1000;
while (0 == result
&& 0 >= m_count)
{
result = pthread_cond_timedwait(&m_cond, &m_mutex, &ts);
}
# endif // BX_PLATFORM_NACL || BX_PLATFORM_OSX
bool ok = 0 == result;
if (ok)
{
--m_count;
}
result = pthread_mutex_unlock(&m_mutex);
BX_CHECK(0 == result, "pthread_mutex_unlock %d", result);
BX_UNUSED(result);
return ok;
}
# else
Semaphore::Semaphore()
{
int32_t result = sem_init(&m_handle, 0, 0);
BX_CHECK(0 == result, "sem_init failed. errno %d", errno);
BX_UNUSED(result);
}
Semaphore::~Semaphore()
{
int32_t result = sem_destroy(&m_handle);
BX_CHECK(0 == result, "sem_destroy failed. errno %d", errno);
BX_UNUSED(result);
}
void Semaphore::post(uint32_t _count)
{
int32_t result;
for (uint32_t ii = 0; ii < _count; ++ii)
{
result = sem_post(&m_handle);
BX_CHECK(0 == result, "sem_post failed. errno %d", errno);
}
BX_UNUSED(result);
}
bool Semaphore::wait(int32_t _msecs)
{
# if BX_PLATFORM_NACL || BX_PLATFORM_OSX
BX_CHECK(-1 == _msecs, "NaCl and OSX don't support sem_timedwait at this moment."); BX_UNUSED(_msecs);
return 0 == sem_wait(&m_handle);
# else
if (0 > _msecs)
{
int32_t result;
do
{
result = sem_wait(&m_handle);
} // keep waiting when interrupted by a signal handler...
while (-1 == result && EINTR == errno);
BX_CHECK(0 == result, "sem_wait failed. errno %d", errno);
return 0 == result;
}
timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += _msecs/1000;
ts.tv_nsec += (_msecs%1000)*1000;
return 0 == sem_timedwait(&m_handle, &ts);
# endif // BX_PLATFORM_
}
# endif // BX_CONFIG_SEMAPHORE_PTHREAD
#elif BX_PLATFORM_XBOX360 || BX_PLATFORM_XBOXONE || BX_PLATFORM_WINDOWS || BX_PLATFORM_WINRT
Semaphore::Semaphore()
{
#if BX_PLATFORM_XBOXONE || BX_PLATFORM_WINRT
m_handle = CreateSemaphoreExW(NULL, 0, LONG_MAX, NULL, 0, SEMAPHORE_ALL_ACCESS);
#else
m_handle = CreateSemaphoreA(NULL, 0, LONG_MAX, NULL);
#endif
BX_CHECK(NULL != m_handle, "Failed to create Semaphore!");
}
Semaphore::~Semaphore()
{
CloseHandle(m_handle);
}
void Semaphore::post(uint32_t _count)
{
ReleaseSemaphore(m_handle, _count, NULL);
}
bool Semaphore::wait(int32_t _msecs)
{
DWORD milliseconds = (0 > _msecs) ? INFINITE : _msecs;
#if BX_PLATFORM_XBOXONE || BX_PLATFORM_WINRT
return WAIT_OBJECT_0 == WaitForSingleObjectEx(m_handle, milliseconds, FALSE);
#else
return WAIT_OBJECT_0 == WaitForSingleObject(m_handle, milliseconds);
#endif
}
#endif // BX_PLATFORM_
} // namespace bx
#endif // BX_CONFIG_SUPPORTS_THREADING
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