SDL_CreateSemaphore - Online Linux Manual PageSection : 3
Updated : Tue 11 Sep 2001, 23:00
Source : SDL
Note : SDL API Reference
NAMESDL_CreateSemaphore − Creates a new semaphore and assigns an initial value to it.
SYNOPSIS#include "SDL.h" #include "SDL_thread.h" SDL_sem *SDL_CreateSemaphore(Uint32 initial_value);
DESCRIPTIONSDL_CreateSemaphore() creates a new semaphore and initializes it with the value initial_value. Each locking operation on the semaphore by SDL_SemWait, SDL_SemTryWait or SDL_SemWaitTimeout will atomically decrement the semaphore value. The locking operation will be blocked if the semaphore value is not positive (greater than zero). Each unlock operation by SDL_SemPost will atomically increment the semaphore value.
RETURN VALUEReturns a pointer to an initialized semaphore or NULL if there was an error.
EXAMPLESSDL_sem *my_sem;
my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
if (my_sem == NULL) {
return CREATE_SEM_FAILED;
}
SEE ALSOSDL_DestroySemaphore, SDL_SemWait, SDL_SemTryWait, SDL_SemWaitTimeout, SDL_SemPost, SDL_SemValue 0
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