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