1. 使用場景：死鎖

MutexLock mutex; void foo() { mutex.lock(); // do something mutex.unlock(); } void bar() { mutex.lock(); // do something foo(); mutex.unlock(); }

1.1 解決方案

#include <iostream> #include <thread> #include <mutex>class X {std::recursive_mutex m;std::string shared;public:void fun1() {std::lock_guard<std::recursive_mutex> lk(m);shared = "fun1";std::cout << "in fun1, shared variable is now " << shared << '\n';}void fun2() {std::lock_guard<std::recursive_mutex> lk(m);shared = "fun2";std::cout << "in fun2, shared variable is now " << shared << '\n';fun1(); // ① 遞歸鎖在此處變得有用std::cout << "back in fun2, shared variable is " << shared << '\n';}; };int main() {X x;std::thread t1(&X::fun1, &x);std::thread t2(&X::fun2, &x);t1.join();t2.join(); }

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