Merge "SoundPool: Set completion flag before promise" into rvc-dev

    static int staticFunction(void *data) {

        JavaThread *jt = static_cast<JavaThread *>(data);

        jt->mF();

        jt->mIsClosed = true;  // set the flag that we are closed

                               // now before we allow the destructor to execute;

                               // otherwise there may be a use after free.

        jt->mPromise.set_value();

        jt->mIsClosed = true;  // publicly inform that we are closed

                               // after we have accessed all variables.

        return 0;

    }