.\" $NetBSD: pthread_mutex_init.3,v 1.3 2005/03/21 17:55:07 kleink Exp $
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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 .