pthread_once - once-only 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 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
argument, it calls
init_routine with no argument and changes the value
of the
once_control variable to record that initialization has been
performed. Subsequent calls to
pthread_once with the same
once_control argument do nothing.
pthread_once always returns 0.
None.
Xavier Leroy <
[email protected]>