pthread_once(3P)					      pthread_once(3P)

NAME    [Toc]    [Back]

     pthread_once - thread-safe	initialization

C SYNOPSIS    [Toc]    [Back]

     #include <pthread.h>

     int pthread_once(pthread_once_t *once, void (*init)(void));

DESCRIPTION    [Toc]    [Back]

     The pthread_once()	function ensures that the function init	is called
     exactly once for all callers using	the once initialization	variable.
     This variable is initialized with the constant PTHREAD_ONCE_INIT.	While
     init is being executed all	callers	of pthread_once() will wait.

     If	a thread is cancelled while executing the init function	[see
     pthread_setcancelstate()],	then pthread_once() will permit	another	thread
     (possibly waiting)	to make	the call.

DIAGNOSTICS    [Toc]    [Back]

     There are no errors for pthread_once.

SEE ALSO    [Toc]    [Back]

     pthread_setcancelstate(3P).


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