|PTHREAD_ONCE(3)||Library Functions Manual||PTHREAD_ONCE(3)|
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.
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.
PTHREAD_ONCE_INIT is defined
in the header file
The behavior of
undefined if once_control has automatic storage
duration or is not initialized by
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.1”).
|September 14, 2015||OpenBSD-current|