SDL_DestroySemaphore(3) SDL API Reference SDL_DestroySemaphore(3)NAME
SDL_DestroySemaphore - Destroys a semaphore that was created by SDL_CreateSemaphore.
SYNOPSIS
#include "SDL.h" #include "SDL_thread.h"
void SDL_DestroySemaphore(SDL_sem *sem);
DESCRIPTION
SDL_DestroySemaphore destroys the semaphore pointed to by sem that was created by SDL_CreateSemaphore. It is not safe to destroy a sema-
phore if there are threads currently blocked waiting on it.
EXAMPLES
if (my_sem != NULL) {
SDL_DestroySemaphore(my_sem);
my_sem = NULL;
}
SEE ALSO
SDL_CreateSemaphore, SDL_SemWait, SDL_SemTryWait, SDL_SemWaitTimeout, SDL_SemPost, SDL_SemValue
SDL Tue 11 Sep 2001, 23:00 SDL_DestroySemaphore(3)
Check Out this Related Man Page
SDL_SemWaitTimeout(3) SDL API Reference SDL_SemWaitTimeout(3)NAME
SDL_SemWaitTimeout - Lock a semaphore, but only wait up to a specified maximum time.
SYNOPSIS
#include "SDL.h" #include "SDL_thread.h"
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout);
DESCRIPTION
SDL_SemWaitTimeout() is a varient of SDL_SemWait with a maximum timeout value. If the value of the semaphore pointed to by sem is positive
(greater than zero) it will atomically decrement the semaphore value and return 0, otherwise it will wait up to timeout milliseconds trying
to lock the semaphore. This function is to be avoided if possible since on some platforms it is implemented by polling the semaphore every
millisecond in a busy loop.
After SDL_SemWaitTimeout() is successful, the semaphore can be released and its count atomically incremented by a successful call to
SDL_SemPost.
RETURN VALUE
Returns 0 if the semaphore was successfully locked or either SDL_MUTEX_TIMEOUT or -1 if the timeout period was exceeded or there was an
error, respectivly.
If the semaphore was not successfully locked, the semaphore will be unchanged.
EXAMPLES
res = SDL_SemWaitTimeout(my_sem, WAIT_TIMEOUT_MILLISEC);
if (res == SDL_MUTEX_TIMEOUT) {
return TRY_AGAIN;
}
if (res == -1) {
return WAIT_ERROR;
}
...
SDL_SemPost(my_sem);
SEE ALSO
SDL_CreateSemaphore, SDL_DestroySemaphore, SDL_SemWait, SDL_SemTryWait, SDL_SemPost, SDL_SemValue
SDL Tue 11 Sep 2001, 23:00 SDL_SemWaitTimeout(3)
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