C++

参考

<mutex>

recursive_mutex

public member function
<mutex>

std::recursive_mutex::try_lock

bool try_lock() noexcept;
Lock mutex if not locked by other threads
Attempts to lock the recursive_mutex, without blocking

  • If the recursive_mutex isn't currently locked by any thread, the calling thread locks it (from this point, and until its member unlock is called, the thread owns the recursive_mutex).
  • If the recursive_mutex is currently locked by another thread, the function fails and returns false, without blocking (the calling thread continues its execution).
  • If the recursive_mutex is currently locked by the same thread calling this function, the thread acquires a new level of ownership over the recursive_mutex. Unlocking the recursive_mutex completely will require an additional call to member unlock.

This function may fail spuriously when no other thread has a lock on the recursive_mutex, but repeated calls in these circumstances shall succeed at some point.

All lock and unlock operations on the recursive_mutex follow a single total order, with all visible effects synchronized between the lock operations and previous unlock operations on the same object.

参数

无

返回值

true if the function succeeds in locking the recursive_mutex for the thread.
否则返回 false。

数据竞争

The recursive_mutex object is accessed/modified as an atomic operation (causes no data races).

异常安全

无异常保证： 绝不抛出异常。

另见

recursive_mutex::lock
Lock recursive mutex (public member function)
recursive_mutex::unlock
Unlocks mutex (public member function)