man SDL_CreateSemaphore (Fonctions bibliothèques) - SDL_CreateSemaphore- Creates a new semaphore and assigns an initial value to it.
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
CWSDL_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