Created
September 28, 2023 02:30
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A program scenario in C++ that bind timer to a callback function
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| #include <atomic> | |
| #include <iostream> | |
| #include <thread> | |
| #include <unistd.h> | |
| // A simple timer that use atomic bool to identify it's status. | |
| struct Timer { | |
| bool overdue() { return flag_.load() ? true : false; } | |
| void reset_timer() { | |
| flag_.store(true); | |
| return; | |
| } | |
| void reset_status() { | |
| flag_.store(false); | |
| return; | |
| } | |
| private: | |
| // when flag_ is true, then timer is overdued. | |
| std::atomic_bool flag_; | |
| }; | |
| static Timer t; | |
| void trigger_callback(void (*ptr)(int)) { | |
| // trigger callback for 10 timers | |
| for (int i = 0; i < 10; i++) { | |
| ptr(i); | |
| } | |
| // and not trigger callback to verify if callback monitor is on work. | |
| sleep(2); | |
| } | |
| void callback(const int i) { | |
| std::cout << "callback is triggered, reset callback monitor timer" | |
| << std::endl; | |
| t.reset_status(); | |
| return; | |
| } | |
| void callback_monitor() { | |
| while (true) { | |
| // check timer if is overdue | |
| if (t.overdue()) { | |
| std::cout << "callback is not triggered, overdue." << std::endl; | |
| } | |
| // | |
| sleep(3); | |
| t.reset_timer(); | |
| } | |
| } | |
| int main() { | |
| std::thread callback_triggered_th = std::thread(trigger_callback, &callback); | |
| std::thread callback_monitor_th = std::thread(callback_monitor); | |
| callback_triggered_th.join(); | |
| callback_monitor_th.join(); | |
| return 0; | |
| } |
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