зеркало из https://github.com/mozilla/pjs.git
204 строки
6.0 KiB
C++
204 строки
6.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Plugin App.
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*
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* The Initial Developer of the Original Code is
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* Chris Jones <jones.chris.g@gmail.com>
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef ipc_glue_SyncChannel_h
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#define ipc_glue_SyncChannel_h 1
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#include "mozilla/ipc/AsyncChannel.h"
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namespace mozilla {
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namespace ipc {
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//-----------------------------------------------------------------------------
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class SyncChannel : public AsyncChannel
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{
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protected:
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typedef uint16 MessageId;
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public:
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static const int32 kNoTimeout;
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class /*NS_INTERFACE_CLASS*/ SyncListener :
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public AsyncChannel::AsyncListener
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{
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public:
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virtual ~SyncListener() { }
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virtual void OnChannelClose() = 0;
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virtual void OnChannelError() = 0;
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virtual Result OnMessageReceived(const Message& aMessage) = 0;
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virtual bool OnReplyTimeout() = 0;
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virtual Result OnMessageReceived(const Message& aMessage,
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Message*& aReply) = 0;
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};
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SyncChannel(SyncListener* aListener);
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virtual ~SyncChannel();
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NS_OVERRIDE
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virtual bool Send(Message* msg) {
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return AsyncChannel::Send(msg);
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}
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// Synchronously send |msg| (i.e., wait for |reply|)
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virtual bool Send(Message* msg, Message* reply);
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void SetReplyTimeoutMs(int32 aTimeoutMs) {
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AssertWorkerThread();
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mTimeoutMs = (aTimeoutMs <= 0) ? kNoTimeout : aTimeoutMs;
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}
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// Override the AsyncChannel handler so we can dispatch sync messages
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NS_OVERRIDE virtual void OnMessageReceived(const Message& msg);
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NS_OVERRIDE virtual void OnChannelError();
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static bool IsPumpingMessages() {
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return sIsPumpingMessages;
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}
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static void SetIsPumpingMessages(bool aIsPumping) {
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sIsPumpingMessages = aIsPumping;
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}
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#ifdef OS_WIN
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struct NS_STACK_CLASS SyncStackFrame
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{
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SyncStackFrame(SyncChannel* channel, bool rpc);
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~SyncStackFrame();
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bool mRPC;
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bool mSpinNestedEvents;
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SyncChannel* mChannel;
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/* the previous stack frame for this channel */
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SyncStackFrame* mPrev;
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/* the previous stack frame on any channel */
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SyncStackFrame* mStaticPrev;
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};
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friend struct SyncChannel::SyncStackFrame;
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static bool IsSpinLoopActive() {
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for (SyncStackFrame* frame = sStaticTopFrame;
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frame;
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frame = frame->mPrev) {
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if (frame->mSpinNestedEvents)
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return true;
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}
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return false;
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}
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protected:
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/* the deepest sync stack frame for this channel */
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SyncStackFrame* mTopFrame;
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/* the deepest sync stack frame on any channel */
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static SyncStackFrame* sStaticTopFrame;
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#endif // OS_WIN
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protected:
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// Executed on the worker thread
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bool ProcessingSyncMessage() const {
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return mProcessingSyncMessage;
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}
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void OnDispatchMessage(const Message& aMsg);
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NS_OVERRIDE
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bool OnSpecialMessage(uint16 id, const Message& msg)
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{
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// SyncChannel doesn't care about any special messages yet
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return AsyncChannel::OnSpecialMessage(id, msg);
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}
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//
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// Return true if the wait ended because a notification was
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// received. That is, true => event received.
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//
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// Return false if the time elapsed from when we started the
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// process of waiting until afterwards exceeded the currently
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// allotted timeout. That *DOES NOT* mean false => "no event" (==
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// timeout); there are many circumstances that could cause the
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// measured elapsed time to exceed the timeout EVEN WHEN we were
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// notified.
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//
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// So in sum: true is a meaningful return value; false isn't,
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// necessarily.
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//
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bool WaitForNotify();
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bool ShouldContinueFromTimeout();
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// Executed on the IO thread.
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void NotifyWorkerThread();
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// On both
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bool AwaitingSyncReply() const {
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mMutex.AssertCurrentThreadOwns();
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return mPendingReply != 0;
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}
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int32 NextSeqno() {
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AssertWorkerThread();
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return mChild ? --mNextSeqno : ++mNextSeqno;
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}
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MessageId mPendingReply;
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bool mProcessingSyncMessage;
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Message mRecvd;
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// This is only accessed from the worker thread; seqno's are
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// completely opaque to the IO thread.
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int32 mNextSeqno;
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static bool sIsPumpingMessages;
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int32 mTimeoutMs;
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#ifdef OS_WIN
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HANDLE mEvent;
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#endif
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private:
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bool EventOccurred();
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // ifndef ipc_glue_SyncChannel_h
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