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.Dd February 3, 2018
.Dt PTHREAD_JOIN 3
.Os
.Sh NAME
.Nm pthread_join ,
.Nm pthread_timedjoin_np
.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"
.In pthread_np.h
.Ft int
.Fn pthread_timedjoin_np "pthread_t thread" "void **value_ptr" "const struct timespec *abstime"
.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
The
.Fn pthread_timedjoin_np
function is equivalent to the
.Fn pthread_join
function except it will return
.Er ETIMEDOUT
if target thread does not exit before specified absolute time passes.
.Pp
A thread that has exited but remains unjoined counts against
[_POSIX_THREAD_THREADS_MAX].
.Sh RETURN VALUES
If successful, the
.Fn pthread_join
and
.Fn pthread_timedjoin_np
functions will return zero.
Otherwise an error number will be returned to
indicate the error.
.Sh ERRORS
The
.Fn pthread_join
and
.Fn pthread_timedjoin_np
functions 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.
.It Bq Er EOPNOTSUPP
The implementation detected that another caller is already waiting on
.Fa thread .
.El
.Pp
Additionally, the
.Fn pthread_timedjoin_np
function will fail if:
.Bl -tag -width Er
.It Bq Er ETIMEDOUT
The specified absolute time passed while
.Fn pthread_timedjoin_np
waited for thread exit.
.El
.Sh SEE ALSO
.Xr wait 2 ,
.Xr pthread_create 3
.Sh STANDARDS
The
.Fn pthread_join
function conforms to
.St -p1003.1-96 .
The
.Fn pthread_timedjoin_np
function is a
.Fx
extension which first appeared in
.Fx 6.1 .