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.\" $FreeBSD: head/share/man/man3/pthread_mutex_init.3 276261 2014-12-26 22:41:10Z bapt $
.\"
.Dd November 4, 2006
.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 *mutex" "const pthread_mutexattr_t *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
The
.Fn pthread_mutex_init
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.It Bq Er ENOMEM
The process cannot allocate enough memory to create another mutex.
.El
.Sh SEE ALSO
.Xr pthread_mutex_destroy 3 ,
.Xr pthread_mutex_lock 3 ,
.Xr pthread_mutex_trylock 3 ,
.Xr pthread_mutex_unlock 3 ,
.Xr pthread_mutexattr 3
.Sh STANDARDS
The
.Fn pthread_mutex_init
function conforms to
.St -p1003.1-96 .