Web MIDI: distributes MIDIPort information asynchronously

content/browser/media/midi_host.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
 #define CONTENT_BROWSER_MEDIA_MIDI_HOST_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 19 matching lines @@
  public:
   // Called from UI thread from the owner of this object.
   MidiHost(int renderer_process_id, media::MidiManager* midi_manager);
 
   // BrowserMessageFilter implementation.
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // MidiManagerClient implementation.
   void CompleteStartSession(media::MidiResult result) override;
+  void AddInputPort(const media::MidiPortInfo& info) override;
+  void AddOutputPort(const media::MidiPortInfo& info) override;
   void ReceiveMidiData(uint32 port,
                        const uint8* data,
                        size_t length,
                        double timestamp) override;
   void AccumulateMidiBytesSent(size_t n) override;
 
   // Start session to access MIDI hardware.
   void OnStartSession();
 
   // Data to be sent to a MIDI output port.
@@ skipping 29 matching lines @@
   // |midi_manager_| talks to the platform-specific MIDI APIs.
   // It can be NULL if the platform (or our current implementation)
   // does not support MIDI.  If not supported then a call to
   // OnRequestAccess() will always refuse access and a call to
   // OnSendData() will do nothing.
   media::MidiManager* const midi_manager_;
 
   // Buffers where data sent from each MIDI input port is stored.
   ScopedVector<media::MidiMessageQueue> received_messages_queues_;
 
+  // Protects access to |received_messages_queues_|;
+  base::Lock messages_queues_lock_;
+
   // The number of bytes sent to the platform-specific MIDI sending
   // system, but not yet completed.
   size_t sent_bytes_in_flight_;
 
   // The number of bytes successfully sent since the last time
   // we've acknowledged back to the renderer.
   size_t bytes_sent_since_last_acknowledgement_;
 
   // Protects access to |sent_bytes_in_flight_|.
   base::Lock in_flight_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MIDI_HOST_H_