\" $NetBSD: pthread_once.3,v 1.10 2016/07/05 10:04:17 wiz Exp $
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\" Copyright (c) 1996 John Birrell <[email protected]>.
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\" $FreeBSD: src/lib/libpthread/man/pthread_once.3,v 1.14 2002/09/16 19:29:29 mini Exp $
\"
Dd July 9, 2010
Dt PTHREAD_ONCE 3
Os
Sh NAME
Nm pthread_once
Nd dynamic package initialization
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_once "pthread_once_t *once_control" "void (*init_routine)(void)"
Vt pthread_once_t once_control No = Dv PTHREAD_ONCE_INIT ;
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
Dv PTHREAD_ONCE_INIT
initializes the static once synchronization control structure
Fa once_control
to be used with
Fn pthread_once .
The behavior of
Fn pthread_once
is undefined if
Fa once_control
has automatic storage duration or is not initialized by
Dv 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 function conforms to
St -p1003.1-2001 .

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