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PR_JoinThread
=============
Blocks the calling thread until a specified thread terminates.
Syntax
------
.. code::
#include <prthread.h>
PRStatus PR_JoinThread(PRThread *thread);
Parameter
~~~~~~~~~
:ref:`PR_JoinThread` has the following parameter:
``thread``
A valid identifier for the thread that is to be joined.
Returns
~~~~~~~
The function returns one of the following values:
- If successful, ``PR_SUCCESS``
- If unsuccessful--for example, if no joinable thread can be found that
corresponds to the specified target thread, or if the target thread
is unjoinable--``PR_FAILURE``.
Description
-----------
:ref:`PR_JoinThread` is used to synchronize the termination of a thread.
The function is synchronous in that it blocks the calling thread until
the target thread is in a joinable state. :ref:`PR_JoinThread` returns to
the caller only after the target thread returns from its root function.
:ref:`PR_JoinThread` must not be called until after :ref:`PR_CreateThread` has
returned. If :ref:`PR_JoinThread` is not called on the same thread as
:ref:`PR_CreateThread`, then it is the caller's responsibility to ensure
that :ref:`PR_CreateThread` has completed.
Several threads cannot wait for the same thread to complete. One of the
calling threads operates successfully, and the others terminate with the
error ``PR_FAILURE``.
The calling thread is not blocked if the target thread has already
terminated.
:ref:`PR_JoinThread` is interruptible.