SDL Library Documentation
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SDL_SemPost

Name

SDL_SemPost -- Unlock a semaphore.

Synopsis

#include "SDL.h"
#include "SDL_thread.h"

int SDL_SemPost(SDL_sem *sem);

Description

SDL_SemPost unlocks the semaphore pointed to by sem and atomically increments the semaphores value. Threads that were blocking on the semaphore may be scheduled after this call succeeds.

SDL_SemPost should be called after a semaphore is locked by a successful call to SDL_SemWait, SDL_SemTryWait or SDL_SemWaitTimeout.

Return Value

Returns 0 if successful or -1 if there was an error (leaving the semaphore unchanged).

Examples

SDL_SemPost(my_sem);

See Also

SDL_CreateSemaphore, SDL_DestroySemaphore, SDL_SemWait, SDL_SemTryWait, SDL_SemWaitTimeout, SDL_SemValue

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