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来看一段代码：

void task1(mutex &m) {cout << "thread 1 init..." << endl;{std::unique_lock<mutex> lock(m);cout << "thread 1 getLock" << endl;sleep(5);}cout << "thread 1 freeLock" << endl;cout << "thread 1 exit..." << endl;
}void task2(mutex &m) {cout << "thread 2 init..." << endl;{std::unique_lock<mutex> lock(m);cout << "thread 2 getLock" << endl;}cout << "thread 2 freeLock" << endl;cout << "thread 2 exit..." << endl;
}int main() {mutex m;jthread t1(task1, std::ref(m));sleep(1);jthread t2(task2, std::ref(m));
}

代码的输出：

thread 1 init...
thread 1 getLock
thread 2 init...
thread 1 freeLock
thread 1 exit...
thread 2 getLock
thread 2 freeLock
thread 2 exit...

可以看出：线程在sleep的时候是不会释放锁的