PTHREAD_ONCE(3) Library Functions Manual PTHREAD_ONCE(3)
NAME
pthread_once - once-only initialization
SYNOPSIS
#include <pthread.h>
pthread_once_t once_control = PTHREAD_ONCE_INIT;
int pthread_once(pthread_once_t *once_control, void (*init_routine)
(void));
DESCRIPTION
The purpose of pthread_once is to ensure that a piece of initialization
code is executed at most once. The once_control argument points to a
static or extern variable statically initialized to PTHREAD_ONCE_INIT.
The first time pthread_once is called with a given once_control argu-
ment, it calls init_routine with no argument and changes the value of
the once_control variable to record that initialization has been per-
formed. Subsequent calls to pthread_once with the same once_control ar-
gument do nothing.
RETURN VALUE
pthread_once always returns 0.
ERRORS
None.
AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr>
LinuxThreads PTHREAD_ONCE(3)
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