蓝桥ROS机器人之现代C++学习笔记7.2 互斥量与临界区

#include 
#include 
#include 

int v = 1;

void critical_section(int change_v) {
    static std::mutex mtx;
    std::lock_guard lock(mtx);

    // do contention operations
    v = change_v;

    // mtx will be destructed when exit this region
}

int main() {
    std::thread t1(critical_section, 2), t2(critical_section, 3);
    t1.join();
    t2.join();

    std::cout << v << std::endl;
    return 0;
}

#include 
#include 
#include 

int v = 1;

void critical_section(int change_v) {
    static std::mutex mtx;
    std::unique_lock lock(mtx);
    // do contention operations
    v = change_v;
    std::cout << v << std::endl;
    // release the lock
    lock.unlock();

    // during this period,
    // others are allowed to acquire v

    // start another group of contention operations
    // lock again
    lock.lock();
    v += 1;
    std::cout << v << std::endl;
}

int main() {
    std::thread t1(critical_section, 2), t2(critical_section, 3);
    t1.join();
    t2.join();
    return 0;
}

尝试编译无果……

查一下，c++20应该可以。

只能使用如下链接：

coliru.stacked-crooked.com

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