C++

参考

<mutex>

recursive_mutex

public member function
<mutex>

std::recursive_mutex::~recursive_mutex

~recursive_mutex();
Destroy recursive mutex
Destroys the recursive_mutex object.

If the object is locked on destruction, it causes undefined behavior.

异常安全

如果未锁定，则永远不会抛出异常（无抛出保证）。
否则，未定义行为。