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NetBSD 6.1.5 - man page for pthread_once (netbsd section 3)

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PTHREAD_ONCE(3) 		   BSD Library Functions Manual 		  PTHREAD_ONCE(3)

NAME
     pthread_once -- dynamic package initialization

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_once(pthread_once_t *once_control, void (*init_routine)(void));

     pthread_once_t once_control = PTHREAD_ONCE_INIT;

DESCRIPTION
     The first call to 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 guaran-
     teed that init_routine() has completed.  The once_control parameter is used to determine
     whether the associated initialization routine has been called.

     The function 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.

     The constant PTHREAD_ONCE_INIT initializes the static once synchronization control structure
     once_control to be used with pthread_once().  The behavior of pthread_once() is undefined if
     once_control has automatic storage duration or is not initialized by PTHREAD_ONCE_INIT.

RETURN VALUES
     If successful,  the pthread_once() function will return zero.  Otherwise an error number
     will be returned to indicate the error.

ERRORS
     None.

STANDARDS
     The function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD					   July 9, 2010 				      BSD
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