mojo/system/simple_dispatcher.cc

   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 #include "mojo/system/simple_dispatcher.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace mojo {
  10 namespace system {
  11
  12 SimpleDispatcher::SimpleDispatcher() {
  13 }
  14
  15 SimpleDispatcher::~SimpleDispatcher() {
  16 }
  17
  18 void SimpleDispatcher::HandleSignalsStateChangedNoLock() {
  19   lock().AssertAcquired();
  20   waiter_list_.AwakeWaitersForStateChange(GetHandleSignalsStateImplNoLock());
  21 }
  22
  23 void SimpleDispatcher::CancelAllWaitersNoLock() {
  24   lock().AssertAcquired();
  25   waiter_list_.CancelAllWaiters();
  26 }
  27
  28 MojoResult SimpleDispatcher::AddWaiterImplNoLock(
  29     Waiter* waiter,
  30     MojoHandleSignals signals,
  31     uint32_t context,
  32     HandleSignalsState* signals_state) {
  33   lock().AssertAcquired();
  34
  35   HandleSignalsState state(GetHandleSignalsStateImplNoLock());
  36   if (state.satisfies(signals)) {
  37     if (signals_state)
  38       *signals_state = state;
  39     return MOJO_RESULT_ALREADY_EXISTS;
  40   }
  41   if (!state.can_satisfy(signals)) {
  42     if (signals_state)
  43       *signals_state = state;
  44     return MOJO_RESULT_FAILED_PRECONDITION;
  45   }
  46
  47   waiter_list_.AddWaiter(waiter, signals, context);
  48   return MOJO_RESULT_OK;
  49 }
  50
  51 void SimpleDispatcher::RemoveWaiterImplNoLock(
  52     Waiter* waiter,
  53     HandleSignalsState* signals_state) {
  54   lock().AssertAcquired();
  55   waiter_list_.RemoveWaiter(waiter);
  56   if (signals_state)
  57     *signals_state = GetHandleSignalsStateImplNoLock();
  58 }
  59
  60 }  // namespace system
  61 }  // namespace mojo