.\" Copyright (c) 2003 Michael Telahun Makonnen
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.\" $FreeBSD: src/share/man/man3/pthread_mutex_timedlock.3,v 1.6 2007/10/22 10:08:00 ru Exp $
.\"
.Dd July 10, 2009
.Dt PTHREAD_MUTEX_TIMEDLOCK 3
.Os
.Sh NAME
.Nm pthread_mutex_timedlock
.Nd lock a mutex without blocking indefinitely
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.In time.h
.Ft int
.Fn pthread_mutex_timedlock "pthread_mutex_t *mutex" "const struct timespec *abs_timeout"
.Sh DESCRIPTION
The
.Fn pthread_mutex_timedlock
function will lock
.Fa mutex .
If it is already locked the calling thread will block until
the mutex becomes available or
the timeout,
specified by abs_timeout,
expires.
The time of the timeout is an absolute time and
is not relative to the current time.
.Sh RETURN VALUES
If successful,
.Fn pthread_mutex_timedlock
will return zero, otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
The
.Fn pthread_mutex_timedlock
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa mutex
was created with the protocol attribute having the
value PTHREAD_PRIO_PROTECT and
the calling thread's priority is higher than the
mutex's current priority ceiling.
.It Bq Er EINVAL
The process or thread would have blocked, and
.Fa abs_timeout
specified a nanosecond value less than zero or
greater than or equal to 1 billion.
.It Bq Er EINVAL
The
.Fa mutex
parameter is invalid.
.It Bq Er ETIMEDOUT
The
.Fa mutex
could not be locked before the timeout expired.
.It Bq Er EAGAIN
The
.Fa mutex
could not be acquired because the
maximum number of recursive locks for the
.Fa mutex
has been exceeded.
.It Bq Er EDEADLK
The current thread already owns the
.Fa mutex .
.El
.Sh SEE ALSO
.Xr pthread_mutex_destroy 3 ,
.Xr pthread_mutex_init 3 ,
.Xr pthread_mutex_lock 3 ,
.Xr pthread_mutex_trylock 3 ,
.Xr pthread_mutex_unlock 3
.Sh STANDARDS
The
.Fn pthread_mutex_timedlock
function is expected to conform to
.St -p1003.1-96 .