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	1	.\" Copyright (c) 1996-1998 John Birrell <jb@cimlogic.com.au>.
	2	.\" All rights reserved.
	3	.\"
	4	.\" Redistribution and use in source and binary forms, with or without
	5	.\" modification, are permitted provided that the following conditions
	6	.\" are met:
	7	.\" 1. Redistributions of source code must retain the above copyright
	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
	12	.\" 3. All advertising materials mentioning features or use of this software
	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by John Birrell.
	15	.\" 4. Neither the name of the author nor the names of any co-contributors
	16	.\" may be used to endorse or promote products derived from this software
	17	.\" without specific prior written permission.
	18	.\"
	19	.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
	20	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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	24	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	.\" SUCH DAMAGE.
	30	.\"
	31	.\" $FreeBSD$
	32	.\"
	33	.Dd January 23, 2010
	34	.Dt PTHREAD_JOIN 3
	35	.Os
	36	.Sh NAME
	37	.Nm pthread_join
	38	.Nd wait for thread termination
	39	.Sh SYNOPSIS
	40	.In pthread.h
	41	.Ft int
	42	.Fn pthread_join "pthread_t thread" "void **value_ptr"
	43	.Sh DESCRIPTION
	44	The
	45	.Fn pthread_join
	46	function suspends execution of the calling thread until the target
	47	.Fa thread
	48	terminates unless the target
	49	.Fa thread
	50	has already terminated.
	51	.Pp
	52	On return from a successful
	53	.Fn pthread_join
	54	call with a non-NULL
	55	.Fa value_ptr
	56	argument, the value passed to
	57	.Fn pthread_exit
	58	by the terminating thread is stored in the location referenced by
	59	.Fa value_ptr .
	60	When a
	61	.Fn pthread_join
	62	returns successfully, the target thread has been terminated.
	63	The results
	64	of multiple simultaneous calls to
	65	.Fn pthread_join
	66	specifying the same target thread are undefined.
	67	If the thread calling
	68	.Fn pthread_join
	69	is cancelled, then the target thread is not detached.
	70	.Pp
	71	.Sh RETURN VALUES
	72	If successful, the
	73	.Fn pthread_join
	74	function will return zero.
	75	Otherwise, an error number will be returned to
	76	indicate the error.
	77	.Sh ERRORS
	78	The
	79	.Fn pthread_join
	80	function will fail if:
	81	.Bl -tag -width Er
	82	.It Bq Er EINVAL
	83	The implementation has detected that the value specified by
	84	.Fa thread
	85	does not refer to a joinable thread.
	86	.It Bq Er ESRCH
	87	No thread could be found corresponding to that specified by the given
	88	thread ID,
	89	.Fa thread .
	90	.It Bq Er EDEADLK
	91	A deadlock was detected or the value of
	92	.Fa thread
	93	specifies the calling thread.
	94	.El
	95	.Sh SEE ALSO
	96	.Xr wait 2 ,
	97	.Xr pthread_create 3
	98	.Sh STANDARDS
	99	The
	100	.Fn pthread_join
	101	function conforms to
	102	.St -p1003.1-96 .