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Showing content from https://timsong-cpp.github.io/cppwp/n4659/thread.mutex.recursive below:

[thread.mutex.recursive]

namespace std {
  class recursive_mutex {
  public:
    recursive_mutex();
    ~recursive_mutex();

    recursive_mutex(const recursive_mutex&) = delete;
    recursive_mutex& operator=(const recursive_mutex&) = delete;

    void lock();
    bool try_lock() noexcept;
    void unlock();

    using native_handle_type = implementation-defined;     native_handle_type native_handle();                  };
}

The class recursive_­mutex provides a recursive mutex with exclusive ownership semantics. If one thread owns a recursive_­mutex object, attempts by another thread to acquire ownership of that object will fail (for try_­lock()) or block (for lock()) until the first thread has completely released ownership.

A thread that owns a recursive_­mutex object may acquire additional levels of ownership by calling lock() or try_­lock() on that object. It is unspecified how many levels of ownership may be acquired by a single thread. If a thread has already acquired the maximum level of ownership for a recursive_­mutex object, additional calls to try_­lock() shall fail, and additional calls to lock() shall throw an exception of type system_­error. A thread shall call unlock() once for each level of ownership acquired by calls to lock() and try_­lock(). Only when all levels of ownership have been released may ownership be acquired by another thread.

The behavior of a program is undefined if:

• it destroys a recursive_­mutex object owned by any thread or

• a thread terminates while owning a recursive_­mutex object.

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