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-
-// $Id$
-
-#ifndef BARRIER_H
-#define BARRIER_H
-
-#include "ace/Synch.h"
-
-/* Barrier is a simple wrapper for the ACE_Barrier synchronization
- class. The ACE_Barrier is already pretty easy to use but I thought
- I'd wrap it up to create just a bit more abstraction at the
- application level.
- */
-class Barrier
-{
-public:
- // Basic constructor and destructor. If you only need to
- // synch the start of your threads, you can safely delete your
- // Barrier object after invoking done(). Of course, you
- // should be careful to only delete the object once!
- Barrier(void);
- ~Barrier(void);
-
- // Set and get the number of threads that the barrier will
- // manage. If you add or remove threads to your application
- // at run-time you can use the mutator to reflect that
- // change. Note, however, that you can only do that from the
- // thread which first created the Barrier. (This is a
- // limitation of my Barrier object, not the ACE_Barrier.)
- // The optional _wait parameter will cause wait() to be
- // invoked if there is already a valid threads value.
- int threads( u_int _threads, int _wait = 0);
- u_int threads(void);
-
- // Wait for all threads to reach the point where this is
- // invoked. Because of the snappy way in which ACE_Barrier is
- // implemented, you can invoke these back-to-back with no ill-effects.
- int wait(void);
-
- // done() will invoke wait(). Before returning though, it
- // will delete the barrier_ pointer below to reclaim some memory.
- int done(void);
-
-protected:
- // The number of threads we're synching
- ACE_Atomic_Op<ACE_Mutex,u_int> threads_;
-
- // The ACE_Barrier that does all of the work
- ACE_Barrier * barrier_;
-
- // The thread which created the Barrier in the first place.
- // Only this thread can change the threads_ value.
- ACE_thread_t owner_;
-
- // An internal method that constructs the barrier_ as needed.
- int make_barrier( int _wait );
-};
-
-#endif // BARRIER_H