\" $NetBSD: pthread_join.3,v 1.6 2010/07/09 10:55:11 wiz Exp $
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\" $FreeBSD: src/lib/libpthread/man/pthread_join.3,v 1.13 2002/09/16 19:29:28 mini Exp $
\"
Dd July 9, 2010
Dt PTHREAD_JOIN 3
Os
Sh NAME
Nm pthread_join
Nd wait for thread termination
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In 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
Pf non- Dv 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
Dv _POSIX_THREAD_THREADS_MAX .
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
shall fail if:
Bl -tag -width Er
It Bq Er EINVAL
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 .
El
Pp
Fn pthread_join
may fail if:
Bl -tag -width Er
It Bq Er EDEADLK
A deadlock was detected or the value of
Fa thread
specifies the calling thread.
El
Sh SEE ALSO
Xr wait 2 ,
Xr pthread_create 3
Sh STANDARDS
The function conforms to
St -p1003.1-2001 .

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