49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*************************************************************************
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> File Name : demo4_lock_guard.cpp
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> Author : TL Song
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> EMail : songtianlun@frytea.com
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> Created Time : Tue Feb 9 11:43:19 2021
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************************************************************************/
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#include <iostream>
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#include <thread>
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#include <vector>
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#include <mutex>
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#include <chrono>
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#include <stdexcept>
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int counter = 0;
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std::mutex mtx; // 保护counter
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void increase_proxy(int time, int id) {
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for (int i = 0; i < time; i++) {
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// std::lock_guard对象构造时，自动调用mtx.lock()进行上锁
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// std::lock_guard对象析构时，自动调用mtx.unlock()释放锁
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std::lock_guard<std::mutex> lk(mtx);
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// 线程1上锁成功后，抛出异常：未释放锁
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if (id == 1) {
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throw std::runtime_error("throw excption....");
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}
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// 当前线程休眠1毫秒
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std::this_thread::sleep_for(std::chrono::milliseconds(1));
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counter++;
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}
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}
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void increase(int time, int id) {
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try {
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increase_proxy(time, id);
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}
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catch (const std::exception& e){
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std::cout << "id:" << id << ", " << e.what() << std::endl;
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}
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}
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int main(int argc, char** argv) {
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std::thread t1(increase, 10000, 1);
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std::thread t2(increase, 10000, 2);
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t1.join();
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t2.join();
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std::cout << "counter:" << counter << std::endl;
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return 0;
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} |