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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
       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.

RETURN VALUE

       pthread_once always returns 0.

ERRORS

       None.

AUTHOR

       Xavier Leroy <Xavier.Leroy@inria.fr>

                                 LinuxThreads                  PTHREAD_ONCE(3)