Method try_delete

src/bthread/timer_thread.cpp:303–311

}

bool TimerThread::Task::try_delete() {
    const uint32_t id_version = version_of_task_id(task_id);
    if (version.load(butil::memory_order_relaxed) != id_version) {
        CHECK_EQ(version.load(butil::memory_order_relaxed), id_version + 2);
        butil::return_resource(slot_of_task_id(task_id));
        return true;
    }
    return false;
}

template <typename T>
static T deref_value(void* arg) {