SDL_SemWait?

SDL_SemWait?

NAME SYNOPSIS DESCRIPTION RETURN VALUE EXAMPLES SEE ALSO

NAME

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

SYNOPSIS

#include

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?