/* The Win32 callback for filling the WAVE device */
static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
DWORD dwParam1, DWORD dwParam2)
{
SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;
/* Only service "buffer done playing" messages */
if ( uMsg != WOM_DONE )
return;
/* Signal that we are done playing a buffer */
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
ReleaseSemaphoreCE(audio_sem, 1, NULL);
#else
ReleaseSemaphore(audio_sem, 1, NULL);
#endif
}
static void CALLBACK
CaptureSound(HWAVEIN hwi, UINT uMsg, DWORD_PTR dwInstance,
DWORD_PTR dwParam1, DWORD_PTR dwParam2)
{
SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
/* Only service "buffer is filled" messages */
if (uMsg != WIM_DATA)
return;
/* Signal that we have a new buffer of data */
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
ReleaseSemaphoreCE(this->hidden->audio_sem, 1, NULL);
#else
ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
#endif
}
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
{
int retval;
DWORD dwMilliseconds;
if ( ! sem ) {
SDL_SetError("Passed a NULL sem");
return -1;
}
if ( timeout == SDL_MUTEX_MAXWAIT ) {
dwMilliseconds = INFINITE;
} else {
dwMilliseconds = (DWORD)timeout;
}
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) {
#else
switch (WaitForSingleObject(sem->id, dwMilliseconds)) {
#endif
case WAIT_OBJECT_0:
InterlockedDecrement(&sem->count);
retval = 0;
break;
case WAIT_TIMEOUT:
retval = SDL_MUTEX_TIMEDOUT;
break;
default:
SDL_SetError("WaitForSingleObject() failed");
retval = -1;
break;
}
return retval;
}
int SDL_SemTryWait(SDL_sem *sem)
{
return SDL_SemWaitTimeout(sem, 0);
}
int SDL_SemWait(SDL_sem *sem)
{
return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
}
/* Returns the current count of the semaphore */
Uint32 SDL_SemValue(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL sem");
return 0;
}
return sem->count;
}
int SDL_SemPost(SDL_sem *sem)
{
if ( ! sem ) {
SDL_SetError("Passed a NULL sem");
return -1;
}
/* Increase the counter in the first place, because
* after a successful release the semaphore may
* immediately get destroyed by another thread which
* is waiting for this semaphore.
*/
InterlockedIncrement(&sem->count);
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) {
#else
if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) {
#endif
InterlockedDecrement(&sem->count); /* restore */
SDL_SetError("ReleaseSemaphore() failed");
return -1;
}
return 0;
}
