Remove empty MIDI regions which result from recordings made when no MIDI data is...

[ardour.git] / libs / ardour / ardour / butler.h

diff --git a/libs/ardour/ardour/butler.h b/libs/ardour/ardour/butler.h
index b88b82073605385a3dcc3d8dc6a6ba49500ea34e..e3760a8c530d50d2b03ada693b5e8395d0b5a60a 100644 (file)
--- a/libs/ardour/ardour/butler.h
+++ b/libs/ardour/ardour/butler.h
@@ -21,17 +21,27 @@
 #define __ardour_butler_h__
 
 #include <glibmm/thread.h>
+
+#include "pbd/ringbuffer.h"
+#include "pbd/pool.h"
 #include "ardour/types.h"
+#include "ardour/session_handle.h"
 
 namespace ARDOUR {
 
-class Session;
-
-class Butler {
-public:
-       Butler(Session* session);
+/**
+ *  One of the Butler's functions is to clean up (ie delete) unused CrossThreadPools.
+ *  When a thread with a CrossThreadPool terminates, its CTP is added to pool_trash.
+ *  When the Butler thread wakes up, we check this trash buffer for CTPs, and if they
+ *  are empty they are deleted.
+ */
+
+class Butler : public SessionHandleRef
+{
+  public:
+       Butler (Session& session);
        ~Butler();
-
+       
        int  start_thread();
        void terminate_thread();
        void schedule_transport_work();
@@ -39,6 +49,7 @@ public:
        void stop();
        void wait_until_finished();
        bool transport_work_requested() const;
+       void drop_references ();
 
        float read_data_rate() const; ///< in usec
        float write_data_rate() const;
@@ -58,7 +69,6 @@ public:
                };
        };
 
-       Session*     session;
        pthread_t    thread;
        Glib::Mutex  request_lock;
        Glib::Cond   paused;
@@ -67,6 +77,10 @@ public:
        int          request_pipe[2];
        uint32_t     audio_dstream_buffer_size;
        uint32_t     midi_dstream_buffer_size;
+       RingBuffer<CrossThreadPool*> pool_trash;
+
+private:
+       void empty_pool_trash ();
 };
 
 } // namespace ARDOUR