class recursive_mutex : private boost::noncopyable   // Exposition only
{
public:
  // types
  typedef implementation-defined scoped_lock;

  // construct/copy/destruct
  recursive_mutex();
  ~recursive_mutex();
};

Description

The recursive_mutex class is a model of the Mutex concept. It should be used to synchronize access to shared resources using Recursive locking mechanics.

For classes that model related mutex concepts, see recursive_try_mutex and recursive_timed_mutex.

For Unspecified locking mechanics, see mutex, try_mutex, and timed_mutex.

The recursive_mutex class supplies the following typedef, which models the specified locking strategy:

The recursive_mutex class uses a Recursive locking strategy, so attempts to recursively lock a recursive_mutex object succeed and an internal "lock count" is maintained. Attempts to unlock a recursive_mutex object by threads that don't own a lock on it result in undefined behavior.

Like all mutex models in Boost.Threads, recursive_mutex leaves the scheduling policy as Unspecified. Programmers should make no assumptions about the order in which waiting threads acquire a lock.