Method reset

src/bthread/countdown_event.cpp:80–91

}

void CountdownEvent::reset(int v) {
    if (v < 0) {
        LOG(ERROR) << "Invalid count=" << v;
        return;
    }
    const int prev_counter =
            ((butil::atomic<int>*)_butex)
                ->exchange(v, butil::memory_order_release);
    LOG_IF(ERROR, _wait_was_invoked && prev_counter)
        << "Invoking reset() while count=" << prev_counter;
    _wait_was_invoked = false;
}

int CountdownEvent::timed_wait(const timespec& duetime) {
    _wait_was_invoked = true;