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#include "../exceptions/exception.h"
#include "../type.h"
#include "mutex.h"
#include "semaphore.h"
namespace AsuraEngine
{
namespace Threading
{
#define try_create_semaphore(impl) \
if (!mImpl) \
{ \
try \
{ \
mImpl = new impl(init_count); \
} \
catch (Exception& e) \
{ \
mImpl = nullptr; \
} \
}
Semaphore::Semaphore(unsigned int init_count)
: mImpl(nullptr)
{
#ifdef ASURA_THREAD_WIN32
try_create_semaphore(SemaphoreWin32);
#endif
//ASSERT(mImpl);
}
Semaphore::~Semaphore()
{
if (mImpl) delete mImpl;
}
void Semaphore::Signal()
{
ASSERT(mImpl);
mImpl->Signal();
}
bool Semaphore::Wait(int timeout /*= ASURA_MUTEX_MAXWAIT*/)
{
ASSERT(mImpl);
return mImpl->Wait(timeout);
}
#if ASURA_THREAD_WIN32
SemaphoreWin32::SemaphoreWin32(unsigned int init_value)
: SemaphoreImpl(init_value)
{
// UINT_MAX get error.
mSem = CreateSemaphore(NULL, init_value, INT_MAX, NULL);
if (!mSem)
{
int errorCode = GetLastError();
throw Exception("Cant use win32 semaphore. Error code: %d.", errorCode);
}
}
SemaphoreWin32::~SemaphoreWin32()
{
CloseHandle(mSem);
}
void SemaphoreWin32::Signal()
{
InterlockedIncrement(&mCount);
if (ReleaseSemaphore(mSem, 1, NULL) == FALSE)
InterlockedDecrement(&mCount);
}
bool SemaphoreWin32::Wait(int timeout)
{
int result;
result = WaitForSingleObject(mSem, timeout);
if (result == WAIT_OBJECT_0)
{
InterlockedDecrement(&mCount);
return true;
}
else if(result == WAIT_TIMEOUT)
{
// ʱ
return false;
}
else
{
// δ֪
throw Exception("WaitForSingleObject() failed");
}
}
#endif // ASURA_THREAD_WIN32
}
}
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