pthread_once

PTHREAD_ONCE(3)                                                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
       argument do nothing.


RETURN VALUE
       pthread_once always returns 0.


ERRORS
       None.


AUTHOR
       Xavier Leroy <Xavier.Leroy@inria.fr>




                                 LinuxThreads                  PTHREAD_ONCE(3)