freebsd-dev/lib/libpthread/man/pthread_join.3
Julian Elischer 0f7d684755 Submitted by: John Birrell <cimaxp1!jb@werple.net.au>
Here are the diffs for libc_r to get it one step closer to P1003.1c
These make most of the thread/mutex/condvar structures opaque to the
user. There are three functions which have been renamed with _np
suffixes because they are extensions to P1003.1c (I did them for JAVA,
which needs to suspend/resume threads and also start threads suspended).

I've created a new header (pthread_np.h) for the non-POSIX stuff.

The egrep tags stuff in /usr/src/lib/libc_r/Makefile that I uncommented
doesn't work. I think its best to delete it. I don't think libc_r needs
tags anyway, 'cause most of the source is in libc which does have tags.

also:

Here's the first batch of man pages for the thread functions.
The diff to /usr/src/lib/libc_r/Makefile removes some stuff that was
inherited from /usr/src/lib/libc/Makefile that should only be done with
libc.

also:

I should have sent this diff with the pthread(3) man page.
It allows people to type

make -DWANT_LIBC_R world

to get libc_r built with the rest of the world. I put this in the
pthread(3) man page.  The default is still not to build libc_r.


also:
The diff attached adds a pthread(3) man page to /usr/src/share/man/man3.
The idea is that without libc_r installed, this man page will give people
enough info to know that they have to build libc_r.
1996-08-20 08:22:01 +00:00

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3.4 KiB
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.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
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.Dd April 4, 1996
.Dt PTHREAD_JOIN 3
.Os BSD 4
.Sh NAME
.Nm pthread_join
.Nd wait for thread termination
.Sh SYNOPSIS
.Fd #include <pthread.h>
.Ft int
.Fn pthread_join "pthread_t thread" "void **value_ptr"
.Sh DESCRIPTION
The
.Fn pthread_join
function suspends execution of the calling thread until the target
.Fa thread
terminates unless the target
.Fa thread
has already terminated.
.Pp
On return from a successful
.Fn pthread_join
call with a non-NULL
.Fa value_ptr
argument, the value passed to
.Fn pthread_exit
by the terminating thread is stored in the location referenced by
.Fa value_ptr .
When a
.Fn pthread_join
returns successfully, the target thread has been terminated. The results
of multiple simultaneous calls to
.Fn pthread_join
specifying the same target thread are undefined. If the thread calling
.Fn pthread_join
is cancelled, then the target thread is not detached.
.Pp
A thread that has exited but remains unjoined counts against
[_POSIX_THREAD_THREADS_MAX].
.Pp
.Sh RETURN VALUES
If successful, the
.Fn pthread_join
function will return zero. Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
.Fn pthread_join
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The implementation has detected that the value specified by
.Fa thread
does not refer to a joinable thread.
.It Bq Er ESRCH
No thread could be found corresponding to that specified by the given
thread ID,
.Fa thread .
.It Bq Er EDEADLK
A deadlock was detected or the value of
.Fa thread
specifies the calling thread.
.El
.Pp
.Sh SEE ALSO
.Xr pthread_create 3 ,
.Xr wait 2
.Sh STANDARDS
.Fn pthread_join
is expected to conform to IEEE
.Pq Dq Tn POSIX
Std 1003.1c when it is published.