PTHREAD_ONCE(3) BSD Programmer's Manual PTHREAD_ONCE(3)
pthread_once - dynamic package initialization
#include <pthread.h> pthread_once_t once_control = PTHREAD_ONCE_INIT; int pthread_once(pthread_once_t *once_control, void (*init_routine)(void));
The first call to pthread_once() by any thread in a process, with a given once_control, will call the init_routine() with no arguments. Subsequent calls to pthread_once() with the same once_control will not call the init_routine(). On return from pthread_once(), it is guaranteed that init_routine() has completed. The once_control parameter is used to determine whether the associated initialization routine has been called. The function pthread_once() is not a cancellation point. However, if init_routine() is a cancellation point and is cancelled, the effect on once_control is as if pthread_once() was never called. The constant PTHREAD_ONCE_INIT is defined in the header file <pthread.h>. The behavior of pthread_once() is undefined if once_control has automatic storage duration or is not initialized by PTHREAD_ONCE_INIT.
If successful, the pthread_once() function will return zero. Otherwise an error number will be returned to indicate the error.
pthread_once() conforms to ISO/IEC 9945-1:1996 ("POSIX"). MirOS BSD #10-current April 4, 1996 1
Generated on 2015-10-06 19:36:22 by $MirOS: src/scripts/roff2htm,v 1.80 2015/01/02 13:54:19 tg Exp $
These manual pages and other documentation are copyrighted by their respective writers;
their source is available at our CVSweb,
AnonCVS, and other mirrors. The rest is Copyright © 2002–2015 The MirOS Project, Germany.
This product includes material provided by Thorsten Glaser.
This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.