kc3-lang/angle/src/libANGLE/signal_utils.h

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• Author : Jamie Madill
  Date : 2016-07-28 16:20:21
  Hash : 00d6796a
  Message : Replace std::set with vector for signal receivers. This should make insertion much faster, which will improve the speed of many BindBuffer calls. BUG=angleproject:1458 Change-Id: I3f7ebc02cc481257be8b84773506b9ac9e3be677 Reviewed-on: https://chromium-review.googlesource.com/364221 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• src/libANGLE/signal_utils.h

• //
  // Copyright 2016 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // signal_utils:
  //   Helper classes for tracking dependent state changes between objects.
  //   These changes are signaled to the dependent class via channels.
  
  #ifndef LIBANGLE_SIGNAL_UTILS_H_
  #define LIBANGLE_SIGNAL_UTILS_H_
  
  #include <set>
  
  #include "common/angleutils.h"
  
  namespace angle
  {
  
  // Message token passed to the receiver;
  using SignalToken = uint32_t;
  
  // Interface that the depending class inherits from.
  class SignalReceiver
  {
    public:
      virtual ~SignalReceiver() = default;
      virtual void signal(SignalToken token) = 0;
  };
  
  class ChannelBinding;
  
  // The host class owns the channel. It uses the channel to fire signals to the receiver.
  class BroadcastChannel final : NonCopyable
  {
    public:
      BroadcastChannel();
      ~BroadcastChannel();
  
      void signal() const;
      void reset();
  
    private:
      // Only the ChannelBinding class should add or remove receivers.
      friend class ChannelBinding;
      void addReceiver(ChannelBinding *receiver);
      void removeReceiver(ChannelBinding *receiver);
  
      std::vector<ChannelBinding *> mReceivers;
  };
  
  // The dependent class keeps bindings to the host's BroadcastChannel.
  class ChannelBinding final
  {
    public:
      ChannelBinding(SignalReceiver *receiver, SignalToken token);
      ~ChannelBinding();
      ChannelBinding(const ChannelBinding &other) = default;
      ChannelBinding &operator=(const ChannelBinding &other) = default;
  
      void bind(BroadcastChannel *channel);
      void reset();
      void signal() const;
      void onChannelClosed();
  
    private:
      BroadcastChannel *mChannel;
      SignalReceiver *mReceiver;
      SignalToken mToken;
  };
  
  }  // namespace angle
  
  #endif  // LIBANGLE_SIGNAL_UTILS_H_