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28.\" $FreeBSD: src/share/man/man3/pthread_mutex_init.3,v 1.18 2007/10/22 10:08:00 ru Exp $
29.\"
30.Dd July 10, 2009
31.Dt PTHREAD_MUTEX_INIT 3
32.Os
33.Sh NAME
34.Nm pthread_mutex_init
35.Nd create a mutex
36.Sh LIBRARY
37.Lb libpthread
38.Sh SYNOPSIS
39.In pthread.h
40.Ft int
41.Fn pthread_mutex_init "pthread_mutex_t *mutex" "const pthread_mutexattr_t *attr"
42.Sh DESCRIPTION
43The
44.Fn pthread_mutex_init
45function creates a new mutex, with attributes specified with
46.Fa attr .
47If
48.Fa attr
49is NULL the default attributes are used.
50.Sh RETURN VALUES
51If successful,
52.Fn pthread_mutex_init
53will return zero and put the new mutex id into
54.Fa mutex ,
55otherwise an error number will be returned to indicate the error.
56.Sh ERRORS
57The
58.Fn pthread_mutex_init
59function will fail if:
60.Bl -tag -width Er
61.It Bq Er EINVAL
62The value specified by
63.Fa attr
64is invalid.
65.It Bq Er ENOMEM
66The process cannot allocate enough memory to create another mutex.
67.El
68.Sh SEE ALSO
69.Xr pthread_mutexattr 3 ,
70.Xr pthread_mutex_destroy 3 ,
71.Xr pthread_mutex_getprioceiling 3 ,
72.Xr pthread_mutex_lock 3 ,
73.Xr pthread_mutex_setprioceiling 3 ,
74.Xr pthread_mutex_timedlock 3 ,
75.Xr pthread_mutex_trylock 3 ,
76.Xr pthread_mutex_unlock 3
77.Sh STANDARDS
78The
79.Fn pthread_mutex_init
80function conforms to
81.St -p1003.1-96 .
82