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_SemValueSDL Tue 11 Sep 2001, 23:00 SDL_CreateSemaphore(3)
