mojo/edk/system/simple_dispatcher.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_
   6 #define MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_
   7
   8 #include <list>
   9
  10 #include "base/macros.h"
  11 #include "mojo/edk/system/awakable_list.h"
  12 #include "mojo/edk/system/dispatcher.h"
  13 #include "mojo/edk/system/system_impl_export.h"
  14
  15 namespace mojo {
  16 namespace system {
  17
  18 // A base class for simple dispatchers. "Simple" means that there's a one-to-one
  19 // correspondence between handles and dispatchers (see the explanatory comment
  20 // in core.cc). This class implements the standard waiter-signalling mechanism
  21 // in that case.
  22 class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher {
  23  protected:
  24   SimpleDispatcher();
  25   ~SimpleDispatcher() override;
  26
  27   // To be called by subclasses when the state changes (so
  28   // |GetHandleSignalsStateImplNoLock()| should be checked again). Must be
  29   // called under lock.
  30   void HandleSignalsStateChangedNoLock();
  31
  32   // |Dispatcher| protected methods:
  33   void CancelAllAwakablesNoLock() override;
  34   MojoResult AddAwakableImplNoLock(Awakable* awakable,
  35                                    MojoHandleSignals signals,
  36                                    uint32_t context,
  37                                    HandleSignalsState* signals_state) override;
  38   void RemoveAwakableImplNoLock(Awakable* awakable,
  39                                 HandleSignalsState* signals_state) override;
  40
  41  private:
  42   // Protected by |lock()|:
  43   AwakableList awakable_list_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher);
  46 };
  47
  48 }  // namespace system
  49 }  // namespace mojo
  50
  51 #endif  // MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_