SDL_CreateSemaphore(3) SDL API Reference SDL_CreateSemaphore(3)
NAME
SDL_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);
DESCRIPTION
SDL_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 VALUE
Returns a pointer to an initialized semaphore or NULL if there was an error.
EXAMPLES
SDL_sem *my_sem;
my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
if (my_sem == NULL) {
return CREATE_SEM_FAILED;
}
SEE ALSO
SDL_DestroySemaphore, SDL_SemWait, SDL_SemTryWait, SDL_SemWaitTimeout, SDL_SemPost, SDL_SemValue
SDL
Tue 11 Sep 2001, 23:00 SDL_CreateSemaphore(3)
