代码逻辑实现如下：
try {
using string = std::string;
static const string str("I like to code in C c++ python go");
util::Config &config = util::Config::GetInstance(); // initial
util::Logger &logger = util::Logger::GetInstance(); // initial
auto now = std::chrono::steady_clock::now();
std::atomic<bool> ready(false); // std::atomic_bool is_running(false);
std::mutex mutx; // mutable
std::unique_lock<std::mutex> lock(mutx);
std::condition_variable cond; // Predicate pred Only visit start and end...
std::thread thrd([&](){
logger.debug("thread sleep:{}s", std::chrono::duration<float>(std::chrono::steady_clock::now() - now).count());
std::this_thread::sleep_for(std::chrono::seconds(1));
ready = true;
cond.notify_one();
logger.debug("thread notify:{}s", std::chrono::duration<float>(std::chrono::steady_clock::now() - now).count());
});
if (cond.wait_for(lock, std::chrono::milliseconds(3 * 1000), [&]() {
logger.debug("proccess precode:{}s", std::chrono::duration<float>(std::chrono::steady_clock::now() - now).count());
return (ready == true); })) {
logger.debug("proccess wait_for:{}s", std::chrono::duration<float>(std::chrono::steady_clock::now() - now).count());
} else {
logger.debug("proccess timeout:{}s", std::chrono::duration<float>(std::chrono::steady_clock::now() - now).count());
}
thrd.join();
// proccess precode:0.0004306s
// thread sleep:0.0004152s
// thread notify:1.0143577s
// proccess precode:1.0143545s
// proccess wait_for:1.0186943s
} catch (std::exception &error) {
std::cout << "exception error:" << error.what() << " @" << __FILE__ << __LINE__ << std::endl;
}运行时序流程参见日志：
2023-08-03 09:57:05.713 [logger][debug][2632][4548]:config.con_file:D:\code\template\build\Debug\conf\template.json 2023-08-03 09:57:05.714 [logger][debug][2632][4548]:logger.log_file:D:\code\template\build\Debug\logs\template.log 2023-08-03 09:57:05.714 [logger][debug][2632][4548]:proccess precode:0.0004306s 2023-08-03 09:57:05.714 [logger][debug][2632][2508]:thread sleep:0.0004152s 2023-08-03 09:57:06.728 [logger][debug][2632][2508]:thread notify:1.0143577s 2023-08-03 09:57:06.728 [logger][debug][2632][4548]:proccess precode:1.0143545s 2023-08-03 09:57:06.733 [logger][debug][2632][4548]:proccess wait_for:1.0186943s