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 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 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 April 4, 1996 34.Dt PTHREAD_JOIN 3 35.Os BSD 4 36.Sh NAME 37.Nm pthread_join 38.Nd wait for thread termination 39.Sh LIBRARY 40.Lb libc_r 41.Sh SYNOPSIS 42.Fd #include <pthread.h> 43.Ft int 44.Fn pthread_join "pthread_t thread" "void **value_ptr" 45.Sh DESCRIPTION 46The 47.Fn pthread_join 48function suspends execution of the calling thread until the target 49.Fa thread 50terminates unless the target 51.Fa thread 52has already terminated. 53.Pp 54On return from a successful 55.Fn pthread_join 56call with a non-NULL 57.Fa value_ptr 58argument, the value passed to 59.Fn pthread_exit 60by the terminating thread is stored in the location referenced by 61.Fa value_ptr . 62When a 63.Fn pthread_join 64returns successfully, the target thread has been terminated. 65The results 66of multiple simultaneous calls to 67.Fn pthread_join 68specifying the same target thread are undefined. 69If the thread calling 70.Fn pthread_join 71is cancelled, then the target thread is not detached. 72.Pp 73A thread that has exited but remains unjoined counts against 74[_POSIX_THREAD_THREADS_MAX]. 75.Pp 76.Sh RETURN VALUES 77If successful, the 78.Fn pthread_join 79function will return zero. 80Otherwise an error number will be returned to 81indicate the error. 82.Sh ERRORS 83.Fn pthread_join 84will fail if: 85.Bl -tag -width Er 86.It Bq Er EINVAL 87The implementation has detected that the value specified by 88.Fa thread 89does not refer to a joinable thread. 90.It Bq Er ESRCH 91No thread could be found corresponding to that specified by the given 92thread ID, 93.Fa thread . 94.It Bq Er EDEADLK 95A deadlock was detected or the value of 96.Fa thread 97specifies the calling thread. 98.El 99.Pp 100.Sh SEE ALSO 101.Xr wait 2 , 102.Xr pthread_create 3 103.Sh STANDARDS 104.Fn pthread_join 105conforms to 106.St -p1003.1-96 . 107