redhat man page for sdl_semwait

SDL_SemWait(3)							 SDL API Reference						    SDL_SemWait(3)

NAME
       SDL_SemWait- Lock a semaphore and suspend the thread if the semaphore value is zero.

SYNOPSIS
       #include "SDL.h" #include "SDL_thread.h"

       int SDL_SemWait(SDL_sem *sem);

DESCRIPTION
       SDL_SemWait()  suspends	the calling thread until either the semaphore pointed to by sem has a positive value, the call is interrupted by a
       signal or error. If the call is successful it will atomically decrement the semaphore value.

       After SDL_SemWait() is successful, the semaphore can be released and its count atomically incremented by a successful call to SDL_SemPost.

RETURN VALUE
       Returns 0 if successful or -1 if there was an error (leaving the semaphore unchanged).

EXAMPLES
       if (SDL_SemWait(my_sem) == -1) {
	       return WAIT_FAILED;
       }

       ...

       SDL_SemPost(my_sem);

SEE ALSO
       SDL_CreateSemaphore, SDL_DestroySemaphore, SDL_SemTryWait, SDL_SemWaitTimeout, SDL_SemPost, SDL_SemValue

SDL
							      Tue 11 Sep 2001, 23:00						    SDL_SemWait(3)