SDL_SemTryWait man page on Aros

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SDL_SemTryWait(3)	       SDL API Reference	     SDL_SemTryWait(3)

NAME
       SDL_SemTryWait-	Attempt	 to  lock  a  semaphore	 but don't suspend the
       thread.

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

       int SDL_SemTryWait(SDL_sem *sem);

DESCRIPTION
       SDL_SemTryWait is a non-blocking varient of SDL_SemWait. If  the	 value
       of  the	semaphore  pointed  to	by  sem is positive it will atomically
       decrement the semaphore value and return 0, otherwise  it  will	return
       SDL_MUTEX_TIMEOUT instead of suspending the thread.

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

RETURN VALUE
       Returns	0  if  the  semaphore  was  successfully  locked   or	either
       SDL_MUTEX_TIMEOUT or -1 if the thread would have suspended or there was
       an error, respectivly.

       If the semaphore was not successfully locked,  the  semaphore  will  be
       unchanged.

EXAMPLES
       res = SDL_SemTryWait(my_sem);

       if (res == SDL_MUTEX_TIMEOUT) {
	       return TRY_AGAIN;
       }
       if (res == -1) {
	       return WAIT_ERROR;
       }

       ...

       SDL_SemPost(my_sem);

SEE ALSO
       SDL_CreateSemaphore,  SDL_DestroySemaphore,  SDL_SemWait,  SDL_SemWait‚Äź
       Timeout, SDL_SemPost, SDL_SemValue

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