NetBSD/lib/libpthread/pthread_mutex_init.3

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.\" $NetBSD: pthread_mutex_init.3,v 1.3 2005/03/21 17:55:07 kleink Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
.\" All rights reserved.
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.\" 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.
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.\" may be used to endorse or promote products derived from this software
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.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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.\" $FreeBSD: src/lib/libpthread/man/pthread_mutex_init.3,v 1.12 2002/09/16 19:29:29 mini Exp $
.\"
.Dd January 30, 2003
.Dt PTHREAD_MUTEX_INIT 3
.Os
.Sh NAME
.Nm pthread_mutex_init
.Nd create a mutex
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_mutex_init "pthread_mutex_t * restrict mutex" "const pthread_mutexattr_t * restrict attr"
.Sh DESCRIPTION
The
.Fn pthread_mutex_init
function creates a new mutex, with attributes specified with
.Fa attr .
If
.Fa attr
is NULL the default attributes are used.
.Sh RETURN VALUES
If successful,
.Fn pthread_mutex_init
will return zero and put the new mutex id into
.Fa mutex ,
otherwise an error number will be returned to indicate the error.
.Sh ERRORS
.Fn pthread_mutex_init
shall fail if:
.Bl -tag -width Er
.It Bq Er ENOMEM
The process cannot allocate enough memory to initialize another mutex.
.It Bq Er EAGAIN
The system lacks the resources to initialize another mutex.
.El
.Pp
.Fn pthread_mutex_init
may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Sh SEE ALSO
.Xr pthread_mutex_destroy 3 ,
.Xr pthread_mutex_lock 3 ,
.Xr pthread_mutex_trylock 3 ,
.Xr pthread_mutex_unlock 3
.Sh STANDARDS
.Fn pthread_mutex_init
conforms to
.St -p1003.1-96 .