SDL_SemPost -- Unlock a semaphore.
function SDL_SemPost( sem : PSDL_sem ) : Integer;
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
Returns 0 if successful or
-1 if there was an error (leaving the semaphore unchanged).
SDL_SemPost( my_sem );