Merge "Add Thread::join"

    // that case.

            status_t    requestExitAndWait();

    // Wait until this object's thread exits. Returns immediately if not yet running.

    // Do not call from this object's thread; will return WOULD_BLOCK in that case.

            status_t    join();

protected:

    // exitPending() returns true if requestExit() has been called.

            bool        exitPending() const;

    return mStatus;

}

status_t Thread::join()

{

    Mutex::Autolock _l(mLock);

    if (mThread == getThreadId()) {

        LOGW(

        "Thread (this=%p): don't call join() from this "

        "Thread object's thread. It's a guaranteed deadlock!",

        this);

        return WOULD_BLOCK;

    }

    while (mRunning == true) {

        mThreadExitedCondition.wait(mLock);

    }

    return mStatus;

}

bool Thread::exitPending() const

{

    Mutex::Autolock _l(mLock);