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-.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by John Birrell.
-.\" 4. Neither the name of the author nor the names of any co-contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd April 4, 1996
-.Dt PTHREAD_ONCE 3
-.Os
-.Sh NAME
-.Nm pthread_once
-.Nd dynamic package initialization
-.Sh LIBRARY
-.Lb libpthread
-.Sh SYNOPSIS
-.In pthread.h
-.Pp
-pthread_once_t
-.Fa once_control
-= PTHREAD_ONCE_INIT;
-.Ft int
-.Fn pthread_once "pthread_once_t *once_control" "void (*init_routine)(void)"
-.Sh DESCRIPTION
-The first call to
-.Fn pthread_once
-by any thread in a process, with a given
-.Fa once_control ,
-will call the
-.Fn init_routine
-with no arguments.
-Subsequent calls to
-.Fn pthread_once
-with the same
-.Fa once_control
-will not call the
-.Fn init_routine .
-On return from
-.Fn pthread_once ,
-it is guaranteed that
-.Fn init_routine
-has completed.
-The
-.Fa once_control
-parameter is used to determine whether the associated initialization
-routine has been called.
-.Pp
-The function
-.Fn pthread_once
-is not a cancellation point.
-However, if
-.Fn init_routine
-is a cancellation point and is cancelled, the effect on
-.Fa once_control is as if
-.Fn pthread_once
-was never called.
-.Pp
-The constant
-.Fa PTHREAD_ONCE_INIT
-is defined by header
-.In pthread.h .
-.Pp
-The behavior of
-.Fn pthread_once
-is undefined if
-.Fa once_control
-has automatic storage duration or is not initialized by
-.Fa PTHREAD_ONCE_INIT .
-.Sh RETURN VALUES
-If successful, the
-.Fn pthread_once
-function will return zero.
-Otherwise an error number will be returned to
-indicate the error.
-.Sh ERRORS
-None.
-.Sh STANDARDS
-The
-.Fn pthread_once
-function conforms to
-.St -p1003.1-96 .
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