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PTHREAD_ONCE(3) Library Functions Manual PTHREAD_ONCE(3) NAME pthread_once -- dynamic package initialization LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_once(pthread_once_t *once_control, void (*init_routine)(void)); pthread_once_t once_control = PTHREAD_ONCE_INIT; DESCRIPTION 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 initializes the static once synchronization control structure once_control to be used with pthread_once(). The behavior of pthread_once() is undefined if once_control has automatic storage duration or is not initialized by PTHREAD_ONCE_INIT. RETURN VALUES If successful, the pthread_once() function will return zero. Otherwise an error number will be returned to indicate the error. ERRORS None. STANDARDS The function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). NetBSD 7.1.2 July 9, 2010 NetBSD 7.1.2