зеркало из https://github.com/mozilla/gecko-dev.git
1205 строки
37 KiB
C++
1205 строки
37 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/DebugOnly.h"
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#include "WindowsMessageLoop.h"
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#include "RPCChannel.h"
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#include "nsAutoPtr.h"
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#include "nsServiceManagerUtils.h"
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#include "nsStringGlue.h"
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#include "nsIXULAppInfo.h"
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#include "mozilla/PaintTracker.h"
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using namespace mozilla;
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using namespace mozilla::ipc;
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using namespace mozilla::ipc::windows;
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/**
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* The Windows-only code below exists to solve a general problem with deadlocks
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* that we experience when sending synchronous IPC messages to processes that
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* contain native windows (i.e. HWNDs). Windows (the OS) sends synchronous
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* messages between parent and child HWNDs in multiple circumstances (e.g.
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* WM_PARENTNOTIFY, WM_NCACTIVATE, etc.), even when those HWNDs are controlled
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* by different threads or different processes. Thus we can very easily end up
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* in a deadlock by a call stack like the following:
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*
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* Process A:
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* - CreateWindow(...) creates a "parent" HWND.
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* - SendCreateChildWidget(HWND) is a sync IPC message that sends the "parent"
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* HWND over to Process B. Process A blocks until a response is received
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* from Process B.
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*
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* Process B:
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* - RecvCreateWidget(HWND) gets the "parent" HWND from Process A.
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* - CreateWindow(..., HWND) creates a "child" HWND with the parent from
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* process A.
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* - Windows (the OS) generates a WM_PARENTNOTIFY message that is sent
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* synchronously to Process A. Process B blocks until a response is
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* received from Process A. Process A, however, is blocked and cannot
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* process the message. Both processes are deadlocked.
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*
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* The example above has a few different workarounds (e.g. setting the
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* WS_EX_NOPARENTNOTIFY style on the child window) but the general problem is
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* persists. Once two HWNDs are parented we must not block their owning
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* threads when manipulating either HWND.
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*
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* Windows requires any application that hosts native HWNDs to always process
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* messages or risk deadlock. Given our architecture the only way to meet
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* Windows' requirement and allow for synchronous IPC messages is to pump a
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* miniature message loop during a sync IPC call. We avoid processing any
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* queued messages during the loop (with one exception, see below), but
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* "nonqueued" messages (see
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* http://msdn.microsoft.com/en-us/library/ms644927(VS.85).aspx under the
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* section "Nonqueued messages") cannot be avoided. Those messages are trapped
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* in a special window procedure where we can either ignore the message or
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* process it in some fashion.
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*
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* Queued and "non-queued" messages will be processed during RPC calls if
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* modal UI related api calls block an RPC in-call in the child. To prevent
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* windows from freezing, and to allow concurrent processing of critical
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* events (such as painting), we spin a native event dispatch loop while
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* these in-calls are blocked.
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*/
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// pulled from widget's nsAppShell
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extern const PRUnichar* kAppShellEventId;
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#if defined(ACCESSIBILITY)
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// pulled from accessibility's win utils
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extern const PRUnichar* kPropNameTabContent;
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#endif
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namespace {
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const wchar_t kOldWndProcProp[] = L"MozillaIPCOldWndProc";
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// This isn't defined before Windows XP.
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enum { WM_XP_THEMECHANGED = 0x031A };
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PRUnichar gAppMessageWindowName[256] = { 0 };
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int32_t gAppMessageWindowNameLength = 0;
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nsTArray<HWND>* gNeuteredWindows = nullptr;
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typedef nsTArray<nsAutoPtr<DeferredMessage> > DeferredMessageArray;
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DeferredMessageArray* gDeferredMessages = nullptr;
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HHOOK gDeferredGetMsgHook = NULL;
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HHOOK gDeferredCallWndProcHook = NULL;
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DWORD gUIThreadId = 0;
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static UINT sAppShellGeckoMsgId;
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LRESULT CALLBACK
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DeferredMessageHook(int nCode,
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WPARAM wParam,
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LPARAM lParam)
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{
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// XXX This function is called for *both* the WH_CALLWNDPROC hook and the
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// WH_GETMESSAGE hook, but they have different parameters. We don't
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// use any of them except nCode which has the same meaning.
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// Only run deferred messages if all of these conditions are met:
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// 1. The |nCode| indicates that this hook should do something.
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// 2. We have deferred messages to run.
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// 3. We're not being called from the PeekMessage within the WaitForNotify
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// function (indicated with SyncChannel::IsPumpingMessages). We really
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// only want to run after returning to the main event loop.
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if (nCode >= 0 && gDeferredMessages && !SyncChannel::IsPumpingMessages()) {
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NS_ASSERTION(gDeferredGetMsgHook && gDeferredCallWndProcHook,
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"These hooks must be set if we're being called!");
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NS_ASSERTION(gDeferredMessages->Length(), "No deferred messages?!");
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// Unset hooks first, in case we reenter below.
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UnhookWindowsHookEx(gDeferredGetMsgHook);
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UnhookWindowsHookEx(gDeferredCallWndProcHook);
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gDeferredGetMsgHook = 0;
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gDeferredCallWndProcHook = 0;
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// Unset the global and make sure we delete it when we're done here.
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nsAutoPtr<DeferredMessageArray> messages(gDeferredMessages);
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gDeferredMessages = nullptr;
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// Run all the deferred messages in order.
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uint32_t count = messages->Length();
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for (uint32_t index = 0; index < count; index++) {
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messages->ElementAt(index)->Run();
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}
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}
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// Always call the next hook.
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return CallNextHookEx(NULL, nCode, wParam, lParam);
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}
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void
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ScheduleDeferredMessageRun()
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{
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if (gDeferredMessages &&
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!(gDeferredGetMsgHook && gDeferredCallWndProcHook)) {
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NS_ASSERTION(gDeferredMessages->Length(), "No deferred messages?!");
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gDeferredGetMsgHook = ::SetWindowsHookEx(WH_GETMESSAGE, DeferredMessageHook,
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NULL, gUIThreadId);
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gDeferredCallWndProcHook = ::SetWindowsHookEx(WH_CALLWNDPROC,
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DeferredMessageHook, NULL,
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gUIThreadId);
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NS_ASSERTION(gDeferredGetMsgHook && gDeferredCallWndProcHook,
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"Failed to set hooks!");
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}
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}
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LRESULT
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ProcessOrDeferMessage(HWND hwnd,
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UINT uMsg,
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WPARAM wParam,
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LPARAM lParam)
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{
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DeferredMessage* deferred = nullptr;
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// Most messages ask for 0 to be returned if the message is processed.
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LRESULT res = 0;
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switch (uMsg) {
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// Messages that can be deferred as-is. These must not contain pointers in
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// their wParam or lParam arguments!
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case WM_ACTIVATE:
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case WM_ACTIVATEAPP:
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case WM_CANCELMODE:
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case WM_CAPTURECHANGED:
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case WM_CHILDACTIVATE:
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case WM_DESTROY:
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case WM_ENABLE:
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case WM_IME_NOTIFY:
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case WM_IME_SETCONTEXT:
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case WM_KILLFOCUS:
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case WM_MOUSEWHEEL:
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case WM_NCDESTROY:
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case WM_PARENTNOTIFY:
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case WM_SETFOCUS:
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case WM_SYSCOMMAND:
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case WM_DISPLAYCHANGE:
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case WM_SHOWWINDOW: // Intentional fall-through.
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case WM_XP_THEMECHANGED: {
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deferred = new DeferredSendMessage(hwnd, uMsg, wParam, lParam);
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break;
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}
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case WM_DEVICECHANGE:
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case WM_POWERBROADCAST:
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case WM_NCACTIVATE: // Intentional fall-through.
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case WM_SETCURSOR: {
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// Friggin unconventional return value...
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res = TRUE;
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deferred = new DeferredSendMessage(hwnd, uMsg, wParam, lParam);
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break;
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}
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case WM_MOUSEACTIVATE: {
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res = MA_NOACTIVATE;
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deferred = new DeferredSendMessage(hwnd, uMsg, wParam, lParam);
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break;
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}
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// These messages need to use the RedrawWindow function to generate the
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// right kind of message. We can't simply fake them as the MSDN docs say
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// explicitly that paint messages should not be sent by an application.
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case WM_ERASEBKGND: {
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UINT flags = RDW_INVALIDATE | RDW_ERASE | RDW_NOINTERNALPAINT |
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RDW_NOFRAME | RDW_NOCHILDREN | RDW_ERASENOW;
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deferred = new DeferredRedrawMessage(hwnd, flags);
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break;
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}
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// This message will generate a WM_PAINT message if there are invalid
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// areas.
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case WM_PAINT: {
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deferred = new DeferredUpdateMessage(hwnd);
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break;
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}
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// This message holds a string in its lParam that we must copy.
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case WM_SETTINGCHANGE: {
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deferred = new DeferredSettingChangeMessage(hwnd, uMsg, wParam, lParam);
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break;
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}
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// These messages are faked via a call to SetWindowPos.
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case WM_WINDOWPOSCHANGED: {
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deferred = new DeferredWindowPosMessage(hwnd, lParam);
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break;
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}
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case WM_NCCALCSIZE: {
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deferred = new DeferredWindowPosMessage(hwnd, lParam, true, wParam);
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break;
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}
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case WM_COPYDATA: {
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deferred = new DeferredCopyDataMessage(hwnd, uMsg, wParam, lParam);
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res = TRUE;
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break;
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}
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case WM_STYLECHANGED: {
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deferred = new DeferredStyleChangeMessage(hwnd, wParam, lParam);
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break;
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}
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case WM_SETICON: {
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deferred = new DeferredSetIconMessage(hwnd, uMsg, wParam, lParam);
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break;
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}
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// Messages that are safe to pass to DefWindowProc go here.
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case WM_ENTERIDLE:
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case WM_GETICON:
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case WM_NCPAINT: // (never trap nc paint events)
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case WM_GETMINMAXINFO:
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case WM_GETTEXT:
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case WM_NCHITTEST:
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case WM_STYLECHANGING: // Intentional fall-through.
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case WM_WINDOWPOSCHANGING: {
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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// Just return, prevents DefWindowProc from messaging the window
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// syncronously with other events, which may be deferred. Prevents
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// random shutdown of aero composition on the window.
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case WM_SYNCPAINT:
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return 0;
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default: {
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if (uMsg && uMsg == sAppShellGeckoMsgId) {
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// Widget's registered native event callback
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deferred = new DeferredSendMessage(hwnd, uMsg, wParam, lParam);
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} else {
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// Unknown messages only
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#ifdef DEBUG
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nsAutoCString log("Received \"nonqueued\" message ");
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log.AppendInt(uMsg);
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log.AppendLiteral(" during a synchronous IPC message for window ");
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log.AppendInt((int64_t)hwnd);
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wchar_t className[256] = { 0 };
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if (GetClassNameW(hwnd, className, sizeof(className) - 1) > 0) {
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log.AppendLiteral(" (\"");
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log.Append(NS_ConvertUTF16toUTF8((PRUnichar*)className));
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log.AppendLiteral("\")");
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}
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log.AppendLiteral(", sending it to DefWindowProc instead of the normal "
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"window procedure.");
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NS_ERROR(log.get());
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#endif
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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}
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}
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NS_ASSERTION(deferred, "Must have a message here!");
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// Create the deferred message array if it doesn't exist already.
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if (!gDeferredMessages) {
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gDeferredMessages = new nsTArray<nsAutoPtr<DeferredMessage> >(20);
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NS_ASSERTION(gDeferredMessages, "Out of memory!");
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}
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// Save for later. The array takes ownership of |deferred|.
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gDeferredMessages->AppendElement(deferred);
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return res;
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}
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} // anonymous namespace
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// We need the pointer value of this in PluginInstanceChild.
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LRESULT CALLBACK
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NeuteredWindowProc(HWND hwnd,
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UINT uMsg,
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WPARAM wParam,
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LPARAM lParam)
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{
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WNDPROC oldWndProc = (WNDPROC)GetProp(hwnd, kOldWndProcProp);
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if (!oldWndProc) {
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// We should really never ever get here.
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NS_ERROR("No old wndproc!");
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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// See if we care about this message. We may either ignore it, send it to
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// DefWindowProc, or defer it for later.
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return ProcessOrDeferMessage(hwnd, uMsg, wParam, lParam);
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}
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namespace {
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static bool
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WindowIsDeferredWindow(HWND hWnd)
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{
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if (!IsWindow(hWnd)) {
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NS_WARNING("Window has died!");
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return false;
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}
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PRUnichar buffer[256] = { 0 };
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int length = GetClassNameW(hWnd, (wchar_t*)buffer, sizeof(buffer) - 1);
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if (length <= 0) {
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NS_WARNING("Failed to get class name!");
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return false;
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}
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#if defined(ACCESSIBILITY)
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// Tab content creates a window that responds to accessible WM_GETOBJECT
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// calls. This window can safely be ignored.
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if (::GetPropW(hWnd, kPropNameTabContent)) {
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return false;
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}
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#endif
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// Common mozilla windows we must defer messages to.
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nsDependentString className(buffer, length);
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if (StringBeginsWith(className, NS_LITERAL_STRING("Mozilla")) ||
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StringBeginsWith(className, NS_LITERAL_STRING("Gecko")) ||
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className.EqualsLiteral("nsToolkitClass") ||
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className.EqualsLiteral("nsAppShell:EventWindowClass")) {
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return true;
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}
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// Plugin windows that can trigger ipc calls in child:
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// 'ShockwaveFlashFullScreen' - flash fullscreen window
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// 'AGFullScreenWinClass' - silverlight fullscreen window
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if (className.EqualsLiteral("ShockwaveFlashFullScreen") ||
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className.EqualsLiteral("AGFullScreenWinClass")) {
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return true;
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}
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// Google Earth bridging msg window between the plugin instance and a separate
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// earth process. The earth process can trigger a plugin incall on the browser
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// at any time, which is badness if the instance is already making an incall.
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if (className.EqualsLiteral("__geplugin_bridge_window__")) {
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return true;
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}
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// nsNativeAppSupport makes a window like "FirefoxMessageWindow" based on the
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// toolkit app's name. It's pretty expensive to calculate this so we only try
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// once.
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if (gAppMessageWindowNameLength == 0) {
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nsCOMPtr<nsIXULAppInfo> appInfo =
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do_GetService("@mozilla.org/xre/app-info;1");
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if (appInfo) {
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nsAutoCString appName;
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if (NS_SUCCEEDED(appInfo->GetName(appName))) {
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appName.Append("MessageWindow");
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nsDependentString windowName(gAppMessageWindowName);
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CopyUTF8toUTF16(appName, windowName);
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gAppMessageWindowNameLength = windowName.Length();
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}
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}
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// Don't try again if that failed.
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if (gAppMessageWindowNameLength == 0) {
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gAppMessageWindowNameLength = -1;
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}
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}
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if (gAppMessageWindowNameLength != -1 &&
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className.Equals(nsDependentString(gAppMessageWindowName,
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gAppMessageWindowNameLength))) {
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return true;
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}
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return false;
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}
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bool
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NeuterWindowProcedure(HWND hWnd)
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{
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if (!WindowIsDeferredWindow(hWnd)) {
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// Some other kind of window, skip.
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return false;
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}
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NS_ASSERTION(!GetProp(hWnd, kOldWndProcProp), "This should always be null!");
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// It's possible to get NULL out of SetWindowLongPtr, and the only way to know
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// if that's a valid old value is to use GetLastError. Clear the error here so
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// we can tell.
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SetLastError(ERROR_SUCCESS);
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LONG_PTR currentWndProc =
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SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LONG_PTR)NeuteredWindowProc);
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if (!currentWndProc) {
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if (ERROR_SUCCESS == GetLastError()) {
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// No error, so we set something and must therefore reset it.
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SetWindowLongPtr(hWnd, GWLP_WNDPROC, currentWndProc);
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}
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return false;
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}
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NS_ASSERTION(currentWndProc != (LONG_PTR)NeuteredWindowProc,
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"This shouldn't be possible!");
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if (!SetProp(hWnd, kOldWndProcProp, (HANDLE)currentWndProc)) {
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// Cleanup
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NS_WARNING("SetProp failed!");
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SetWindowLongPtr(hWnd, GWLP_WNDPROC, currentWndProc);
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RemoveProp(hWnd, kOldWndProcProp);
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return false;
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}
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return true;
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}
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void
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RestoreWindowProcedure(HWND hWnd)
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{
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NS_ASSERTION(WindowIsDeferredWindow(hWnd),
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"Not a deferred window, this shouldn't be in our list!");
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LONG_PTR oldWndProc = (LONG_PTR)GetProp(hWnd, kOldWndProcProp);
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if (oldWndProc) {
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NS_ASSERTION(oldWndProc != (LONG_PTR)NeuteredWindowProc,
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"This shouldn't be possible!");
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DebugOnly<LONG_PTR> currentWndProc =
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SetWindowLongPtr(hWnd, GWLP_WNDPROC, oldWndProc);
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NS_ASSERTION(currentWndProc == (LONG_PTR)NeuteredWindowProc,
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"This should never be switched out from under us!");
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}
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RemoveProp(hWnd, kOldWndProcProp);
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}
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LRESULT CALLBACK
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CallWindowProcedureHook(int nCode,
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WPARAM wParam,
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LPARAM lParam)
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{
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if (nCode >= 0) {
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NS_ASSERTION(gNeuteredWindows, "This should never be null!");
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HWND hWnd = reinterpret_cast<CWPSTRUCT*>(lParam)->hwnd;
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if (!gNeuteredWindows->Contains(hWnd) && NeuterWindowProcedure(hWnd)) {
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if (!gNeuteredWindows->AppendElement(hWnd)) {
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NS_ERROR("Out of memory!");
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RestoreWindowProcedure(hWnd);
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}
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}
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}
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return CallNextHookEx(NULL, nCode, wParam, lParam);
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}
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inline void
|
|
AssertWindowIsNotNeutered(HWND hWnd)
|
|
{
|
|
#ifdef DEBUG
|
|
// Make sure our neutered window hook isn't still in place.
|
|
LONG_PTR wndproc = GetWindowLongPtr(hWnd, GWLP_WNDPROC);
|
|
NS_ASSERTION(wndproc != (LONG_PTR)NeuteredWindowProc, "Window is neutered!");
|
|
#endif
|
|
}
|
|
|
|
void
|
|
UnhookNeuteredWindows()
|
|
{
|
|
if (!gNeuteredWindows)
|
|
return;
|
|
uint32_t count = gNeuteredWindows->Length();
|
|
for (uint32_t index = 0; index < count; index++) {
|
|
RestoreWindowProcedure(gNeuteredWindows->ElementAt(index));
|
|
}
|
|
gNeuteredWindows->Clear();
|
|
}
|
|
|
|
void
|
|
Init()
|
|
{
|
|
// If we aren't setup before a call to NotifyWorkerThread, we'll hang
|
|
// on startup.
|
|
if (!gUIThreadId) {
|
|
gUIThreadId = GetCurrentThreadId();
|
|
}
|
|
NS_ASSERTION(gUIThreadId, "ThreadId should not be 0!");
|
|
NS_ASSERTION(gUIThreadId == GetCurrentThreadId(),
|
|
"Running on different threads!");
|
|
sAppShellGeckoMsgId = RegisterWindowMessageW(kAppShellEventId);
|
|
}
|
|
|
|
// This timeout stuff assumes a sane value of mTimeoutMs (less than the overflow
|
|
// value for GetTickCount(), which is something like 50 days). It uses the
|
|
// cheapest (and least accurate) method supported by Windows 2000.
|
|
|
|
struct TimeoutData
|
|
{
|
|
DWORD startTicks;
|
|
DWORD targetTicks;
|
|
};
|
|
|
|
void
|
|
InitTimeoutData(TimeoutData* aData,
|
|
int32_t aTimeoutMs)
|
|
{
|
|
aData->startTicks = GetTickCount();
|
|
if (!aData->startTicks) {
|
|
// How unlikely is this!
|
|
aData->startTicks++;
|
|
}
|
|
aData->targetTicks = aData->startTicks + aTimeoutMs;
|
|
}
|
|
|
|
|
|
bool
|
|
TimeoutHasExpired(const TimeoutData& aData)
|
|
{
|
|
if (!aData.startTicks) {
|
|
return false;
|
|
}
|
|
|
|
DWORD now = GetTickCount();
|
|
|
|
if (aData.targetTicks < aData.startTicks) {
|
|
// Overflow
|
|
return now < aData.startTicks && now >= aData.targetTicks;
|
|
}
|
|
return now >= aData.targetTicks;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
RPCChannel::SyncStackFrame::SyncStackFrame(SyncChannel* channel, bool rpc)
|
|
: mRPC(rpc)
|
|
, mSpinNestedEvents(false)
|
|
, mListenerNotified(false)
|
|
, mChannel(channel)
|
|
, mPrev(mChannel->mTopFrame)
|
|
, mStaticPrev(sStaticTopFrame)
|
|
{
|
|
mChannel->mTopFrame = this;
|
|
sStaticTopFrame = this;
|
|
|
|
if (!mStaticPrev) {
|
|
NS_ASSERTION(!gNeuteredWindows, "Should only set this once!");
|
|
gNeuteredWindows = new nsAutoTArray<HWND, 20>();
|
|
NS_ASSERTION(gNeuteredWindows, "Out of memory!");
|
|
}
|
|
}
|
|
|
|
RPCChannel::SyncStackFrame::~SyncStackFrame()
|
|
{
|
|
NS_ASSERTION(this == mChannel->mTopFrame,
|
|
"Mismatched RPC stack frames");
|
|
NS_ASSERTION(this == sStaticTopFrame,
|
|
"Mismatched static RPC stack frames");
|
|
|
|
mChannel->mTopFrame = mPrev;
|
|
sStaticTopFrame = mStaticPrev;
|
|
|
|
if (!mStaticPrev) {
|
|
NS_ASSERTION(gNeuteredWindows, "Bad pointer!");
|
|
delete gNeuteredWindows;
|
|
gNeuteredWindows = NULL;
|
|
}
|
|
}
|
|
|
|
SyncChannel::SyncStackFrame* SyncChannel::sStaticTopFrame;
|
|
|
|
// nsAppShell's notification that gecko events are being processed.
|
|
// If we are here and there is an RPC Incall active, we are spinning
|
|
// a nested gecko event loop. In which case the remote process needs
|
|
// to know about it.
|
|
void /* static */
|
|
RPCChannel::NotifyGeckoEventDispatch()
|
|
{
|
|
// sStaticTopFrame is only valid for RPC channels
|
|
if (!sStaticTopFrame || sStaticTopFrame->mListenerNotified)
|
|
return;
|
|
|
|
sStaticTopFrame->mListenerNotified = true;
|
|
RPCChannel* channel = static_cast<RPCChannel*>(sStaticTopFrame->mChannel);
|
|
channel->Listener()->ProcessRemoteNativeEventsInRPCCall();
|
|
}
|
|
|
|
// invoked by the module that receives the spin event loop
|
|
// message.
|
|
void
|
|
RPCChannel::ProcessNativeEventsInRPCCall()
|
|
{
|
|
if (!mTopFrame) {
|
|
NS_ERROR("Spin logic error: no RPC frame");
|
|
return;
|
|
}
|
|
|
|
mTopFrame->mSpinNestedEvents = true;
|
|
}
|
|
|
|
// Spin loop is called in place of WaitForNotify when modal ui is being shown
|
|
// in a child. There are some intricacies in using it however. Spin loop is
|
|
// enabled for a particular RPC frame by the client calling
|
|
// RPCChannel::ProcessNativeEventsInRPCCall().
|
|
// This call can be nested for multiple RPC frames in a single plugin or
|
|
// multiple unrelated plugins.
|
|
void
|
|
RPCChannel::SpinInternalEventLoop()
|
|
{
|
|
if (mozilla::PaintTracker::IsPainting()) {
|
|
NS_RUNTIMEABORT("Don't spin an event loop while painting.");
|
|
}
|
|
|
|
NS_ASSERTION(mTopFrame && mTopFrame->mSpinNestedEvents,
|
|
"Spinning incorrectly");
|
|
|
|
// Nested windows event loop we trigger when the child enters into modal
|
|
// event loops.
|
|
|
|
// Note, when we return, we always reset the notify worker event. So there's
|
|
// no need to reset it on return here.
|
|
|
|
do {
|
|
MSG msg = { 0 };
|
|
|
|
// Don't get wrapped up in here if the child connection dies.
|
|
{
|
|
MonitorAutoLock lock(*mMonitor);
|
|
if (!Connected()) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Retrieve window or thread messages
|
|
if (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
|
|
// The child UI should have been destroyed before the app is closed, in
|
|
// which case, we should never get this here.
|
|
if (msg.message == WM_QUIT) {
|
|
NS_ERROR("WM_QUIT received in SpinInternalEventLoop!");
|
|
} else {
|
|
TranslateMessage(&msg);
|
|
DispatchMessageW(&msg);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Note, give dispatching windows events priority over checking if
|
|
// mEvent is signaled, otherwise heavy ipc traffic can cause jittery
|
|
// playback of video. We'll exit out on each disaptch above, so ipc
|
|
// won't get starved.
|
|
|
|
// Wait for UI events or a signal from the io thread.
|
|
DWORD result = MsgWaitForMultipleObjects(1, &mEvent, FALSE, INFINITE,
|
|
QS_ALLINPUT);
|
|
if (result == WAIT_OBJECT_0) {
|
|
// Our NotifyWorkerThread event was signaled
|
|
return;
|
|
}
|
|
} while (true);
|
|
}
|
|
|
|
bool
|
|
SyncChannel::WaitForNotify()
|
|
{
|
|
mMonitor->AssertCurrentThreadOwns();
|
|
|
|
// Initialize global objects used in deferred messaging.
|
|
Init();
|
|
|
|
NS_ASSERTION(mTopFrame && !mTopFrame->mRPC,
|
|
"Top frame is not a sync frame!");
|
|
|
|
MonitorAutoUnlock unlock(*mMonitor);
|
|
|
|
bool timedout = false;
|
|
|
|
UINT_PTR timerId = 0;
|
|
TimeoutData timeoutData = { 0 };
|
|
|
|
if (mTimeoutMs != kNoTimeout) {
|
|
InitTimeoutData(&timeoutData, mTimeoutMs);
|
|
|
|
// We only do this to ensure that we won't get stuck in
|
|
// MsgWaitForMultipleObjects below.
|
|
timerId = SetTimer(NULL, 0, mTimeoutMs, NULL);
|
|
NS_ASSERTION(timerId, "SetTimer failed!");
|
|
}
|
|
|
|
// Setup deferred processing of native events while we wait for a response.
|
|
NS_ASSERTION(!SyncChannel::IsPumpingMessages(),
|
|
"Shouldn't be pumping already!");
|
|
|
|
SyncChannel::SetIsPumpingMessages(true);
|
|
HHOOK windowHook = SetWindowsHookEx(WH_CALLWNDPROC, CallWindowProcedureHook,
|
|
NULL, gUIThreadId);
|
|
NS_ASSERTION(windowHook, "Failed to set hook!");
|
|
|
|
{
|
|
while (1) {
|
|
MSG msg = { 0 };
|
|
// Don't get wrapped up in here if the child connection dies.
|
|
{
|
|
MonitorAutoLock lock(*mMonitor);
|
|
if (!Connected()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Wait until we have a message in the queue. MSDN docs are a bit unclear
|
|
// but it seems that windows from two different threads (and it should be
|
|
// noted that a thread in another process counts as a "different thread")
|
|
// will implicitly have their message queues attached if they are parented
|
|
// to one another. This wait call, then, will return for a message
|
|
// delivered to *either* thread.
|
|
DWORD result = MsgWaitForMultipleObjects(1, &mEvent, FALSE, INFINITE,
|
|
QS_ALLINPUT);
|
|
if (result == WAIT_OBJECT_0) {
|
|
// Our NotifyWorkerThread event was signaled
|
|
ResetEvent(mEvent);
|
|
break;
|
|
} else
|
|
if (result != (WAIT_OBJECT_0 + 1)) {
|
|
NS_ERROR("Wait failed!");
|
|
break;
|
|
}
|
|
|
|
if (TimeoutHasExpired(timeoutData)) {
|
|
// A timeout was specified and we've passed it. Break out.
|
|
timedout = true;
|
|
break;
|
|
}
|
|
|
|
// The only way to know on which thread the message was delivered is to
|
|
// use some logic on the return values of GetQueueStatus and PeekMessage.
|
|
// PeekMessage will return false if there are no "queued" messages, but it
|
|
// will run all "nonqueued" messages before returning. So if PeekMessage
|
|
// returns false and there are no "nonqueued" messages that were run then
|
|
// we know that the message we woke for was intended for a window on
|
|
// another thread.
|
|
bool haveSentMessagesPending =
|
|
(HIWORD(GetQueueStatus(QS_SENDMESSAGE)) & QS_SENDMESSAGE) != 0;
|
|
|
|
// This PeekMessage call will actually process all "nonqueued" messages
|
|
// that are pending before returning. If we have "nonqueued" messages
|
|
// pending then we should have switched out all the window procedures
|
|
// above. In that case this PeekMessage call won't actually cause any
|
|
// mozilla code (or plugin code) to run.
|
|
|
|
// If the following PeekMessage call fails to return a message for us (and
|
|
// returns false) and we didn't run any "nonqueued" messages then we must
|
|
// have woken up for a message designated for a window in another thread.
|
|
// If we loop immediately then we could enter a tight loop, so we'll give
|
|
// up our time slice here to let the child process its message.
|
|
if (!PeekMessageW(&msg, NULL, 0, 0, PM_NOREMOVE) &&
|
|
!haveSentMessagesPending) {
|
|
// Message was for child, we should wait a bit.
|
|
SwitchToThread();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Unhook the neutered window procedure hook.
|
|
UnhookWindowsHookEx(windowHook);
|
|
|
|
// Unhook any neutered windows procedures so messages can be delivered
|
|
// normally.
|
|
UnhookNeuteredWindows();
|
|
|
|
// Before returning we need to set a hook to run any deferred messages that
|
|
// we received during the IPC call. The hook will unset itself as soon as
|
|
// someone else calls GetMessage, PeekMessage, or runs code that generates
|
|
// a "nonqueued" message.
|
|
ScheduleDeferredMessageRun();
|
|
|
|
if (timerId) {
|
|
KillTimer(NULL, timerId);
|
|
}
|
|
|
|
SyncChannel::SetIsPumpingMessages(false);
|
|
|
|
return WaitResponse(timedout);
|
|
}
|
|
|
|
bool
|
|
RPCChannel::WaitForNotify()
|
|
{
|
|
mMonitor->AssertCurrentThreadOwns();
|
|
|
|
if (!StackDepth()) {
|
|
// There is currently no way to recover from this condition.
|
|
NS_RUNTIMEABORT("StackDepth() is 0 in call to RPCChannel::WaitForNotify!");
|
|
}
|
|
|
|
// Initialize global objects used in deferred messaging.
|
|
Init();
|
|
|
|
NS_ASSERTION(mTopFrame && mTopFrame->mRPC,
|
|
"Top frame is not a sync frame!");
|
|
|
|
MonitorAutoUnlock unlock(*mMonitor);
|
|
|
|
bool timedout = false;
|
|
|
|
UINT_PTR timerId = 0;
|
|
TimeoutData timeoutData = { 0 };
|
|
|
|
// windowHook is used as a flag variable for the loop below: if it is set
|
|
// and we start to spin a nested event loop, we need to clear the hook and
|
|
// process deferred/pending messages.
|
|
// If windowHook is NULL, SyncChannel::IsPumpingMessages should be false.
|
|
HHOOK windowHook = NULL;
|
|
|
|
while (1) {
|
|
NS_ASSERTION((!!windowHook) == SyncChannel::IsPumpingMessages(),
|
|
"windowHook out of sync with reality");
|
|
|
|
if (mTopFrame->mSpinNestedEvents) {
|
|
if (windowHook) {
|
|
UnhookWindowsHookEx(windowHook);
|
|
windowHook = NULL;
|
|
|
|
if (timerId) {
|
|
KillTimer(NULL, timerId);
|
|
timerId = 0;
|
|
}
|
|
|
|
// Used by widget to assert on incoming native events
|
|
SyncChannel::SetIsPumpingMessages(false);
|
|
|
|
// Unhook any neutered windows procedures so messages can be delievered
|
|
// normally.
|
|
UnhookNeuteredWindows();
|
|
|
|
// Send all deferred "nonqueued" message to the intended receiver.
|
|
// We're dropping into SpinInternalEventLoop so we should be fairly
|
|
// certain these will get delivered soohn.
|
|
ScheduleDeferredMessageRun();
|
|
}
|
|
SpinInternalEventLoop();
|
|
ResetEvent(mEvent);
|
|
return true;
|
|
}
|
|
|
|
if (!windowHook) {
|
|
SyncChannel::SetIsPumpingMessages(true);
|
|
windowHook = SetWindowsHookEx(WH_CALLWNDPROC, CallWindowProcedureHook,
|
|
NULL, gUIThreadId);
|
|
NS_ASSERTION(windowHook, "Failed to set hook!");
|
|
|
|
NS_ASSERTION(!timerId, "Timer already initialized?");
|
|
|
|
if (mTimeoutMs != kNoTimeout) {
|
|
InitTimeoutData(&timeoutData, mTimeoutMs);
|
|
timerId = SetTimer(NULL, 0, mTimeoutMs, NULL);
|
|
NS_ASSERTION(timerId, "SetTimer failed!");
|
|
}
|
|
}
|
|
|
|
MSG msg = { 0 };
|
|
|
|
// Don't get wrapped up in here if the child connection dies.
|
|
{
|
|
MonitorAutoLock lock(*mMonitor);
|
|
if (!Connected()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
DWORD result = MsgWaitForMultipleObjects(1, &mEvent, FALSE, INFINITE,
|
|
QS_ALLINPUT);
|
|
if (result == WAIT_OBJECT_0) {
|
|
// Our NotifyWorkerThread event was signaled
|
|
ResetEvent(mEvent);
|
|
break;
|
|
} else
|
|
if (result != (WAIT_OBJECT_0 + 1)) {
|
|
NS_ERROR("Wait failed!");
|
|
break;
|
|
}
|
|
|
|
if (TimeoutHasExpired(timeoutData)) {
|
|
// A timeout was specified and we've passed it. Break out.
|
|
timedout = true;
|
|
break;
|
|
}
|
|
|
|
// See SyncChannel's WaitForNotify for details.
|
|
bool haveSentMessagesPending =
|
|
(HIWORD(GetQueueStatus(QS_SENDMESSAGE)) & QS_SENDMESSAGE) != 0;
|
|
|
|
// PeekMessage markes the messages as "old" so that they don't wake up
|
|
// MsgWaitForMultipleObjects every time.
|
|
if (!PeekMessageW(&msg, NULL, 0, 0, PM_NOREMOVE) &&
|
|
!haveSentMessagesPending) {
|
|
// Message was for child, we should wait a bit.
|
|
SwitchToThread();
|
|
}
|
|
}
|
|
|
|
if (windowHook) {
|
|
// Unhook the neutered window procedure hook.
|
|
UnhookWindowsHookEx(windowHook);
|
|
|
|
// Unhook any neutered windows procedures so messages can be delivered
|
|
// normally.
|
|
UnhookNeuteredWindows();
|
|
|
|
// Before returning we need to set a hook to run any deferred messages that
|
|
// we received during the IPC call. The hook will unset itself as soon as
|
|
// someone else calls GetMessage, PeekMessage, or runs code that generates
|
|
// a "nonqueued" message.
|
|
ScheduleDeferredMessageRun();
|
|
|
|
if (timerId) {
|
|
KillTimer(NULL, timerId);
|
|
}
|
|
}
|
|
|
|
SyncChannel::SetIsPumpingMessages(false);
|
|
|
|
return WaitResponse(timedout);
|
|
}
|
|
|
|
void
|
|
SyncChannel::NotifyWorkerThread()
|
|
{
|
|
mMonitor->AssertCurrentThreadOwns();
|
|
NS_ASSERTION(mEvent, "No signal event to set, this is really bad!");
|
|
if (!SetEvent(mEvent)) {
|
|
NS_WARNING("Failed to set NotifyWorkerThread event!");
|
|
}
|
|
}
|
|
|
|
void
|
|
DeferredSendMessage::Run()
|
|
{
|
|
AssertWindowIsNotNeutered(hWnd);
|
|
if (!IsWindow(hWnd)) {
|
|
NS_ERROR("Invalid window!");
|
|
return;
|
|
}
|
|
|
|
WNDPROC wndproc =
|
|
reinterpret_cast<WNDPROC>(GetWindowLongPtr(hWnd, GWLP_WNDPROC));
|
|
if (!wndproc) {
|
|
NS_ERROR("Invalid window procedure!");
|
|
return;
|
|
}
|
|
|
|
CallWindowProc(wndproc, hWnd, message, wParam, lParam);
|
|
}
|
|
|
|
void
|
|
DeferredRedrawMessage::Run()
|
|
{
|
|
AssertWindowIsNotNeutered(hWnd);
|
|
if (!IsWindow(hWnd)) {
|
|
NS_ERROR("Invalid window!");
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
BOOL ret =
|
|
#endif
|
|
RedrawWindow(hWnd, NULL, NULL, flags);
|
|
NS_ASSERTION(ret, "RedrawWindow failed!");
|
|
}
|
|
|
|
DeferredUpdateMessage::DeferredUpdateMessage(HWND aHWnd)
|
|
{
|
|
mWnd = aHWnd;
|
|
if (!GetUpdateRect(mWnd, &mUpdateRect, FALSE)) {
|
|
memset(&mUpdateRect, 0, sizeof(RECT));
|
|
return;
|
|
}
|
|
ValidateRect(mWnd, &mUpdateRect);
|
|
}
|
|
|
|
void
|
|
DeferredUpdateMessage::Run()
|
|
{
|
|
AssertWindowIsNotNeutered(mWnd);
|
|
if (!IsWindow(mWnd)) {
|
|
NS_ERROR("Invalid window!");
|
|
return;
|
|
}
|
|
|
|
InvalidateRect(mWnd, &mUpdateRect, FALSE);
|
|
#ifdef DEBUG
|
|
BOOL ret =
|
|
#endif
|
|
UpdateWindow(mWnd);
|
|
NS_ASSERTION(ret, "UpdateWindow failed!");
|
|
}
|
|
|
|
DeferredSettingChangeMessage::DeferredSettingChangeMessage(HWND aHWnd,
|
|
UINT aMessage,
|
|
WPARAM aWParam,
|
|
LPARAM aLParam)
|
|
: DeferredSendMessage(aHWnd, aMessage, aWParam, aLParam)
|
|
{
|
|
NS_ASSERTION(aMessage == WM_SETTINGCHANGE, "Wrong message type!");
|
|
if (aLParam) {
|
|
lParamString = _wcsdup(reinterpret_cast<const wchar_t*>(aLParam));
|
|
lParam = reinterpret_cast<LPARAM>(lParamString);
|
|
}
|
|
else {
|
|
lParamString = NULL;
|
|
lParam = 0;
|
|
}
|
|
}
|
|
|
|
DeferredSettingChangeMessage::~DeferredSettingChangeMessage()
|
|
{
|
|
free(lParamString);
|
|
}
|
|
|
|
DeferredWindowPosMessage::DeferredWindowPosMessage(HWND aHWnd,
|
|
LPARAM aLParam,
|
|
bool aForCalcSize,
|
|
WPARAM aWParam)
|
|
{
|
|
if (aForCalcSize) {
|
|
if (aWParam) {
|
|
NCCALCSIZE_PARAMS* arg = reinterpret_cast<NCCALCSIZE_PARAMS*>(aLParam);
|
|
memcpy(&windowPos, arg->lppos, sizeof(windowPos));
|
|
|
|
NS_ASSERTION(aHWnd == windowPos.hwnd, "Mismatched hwnds!");
|
|
}
|
|
else {
|
|
RECT* arg = reinterpret_cast<RECT*>(aLParam);
|
|
windowPos.hwnd = aHWnd;
|
|
windowPos.hwndInsertAfter = NULL;
|
|
windowPos.x = arg->left;
|
|
windowPos.y = arg->top;
|
|
windowPos.cx = arg->right - arg->left;
|
|
windowPos.cy = arg->bottom - arg->top;
|
|
|
|
NS_ASSERTION(arg->right >= arg->left && arg->bottom >= arg->top,
|
|
"Negative width or height!");
|
|
}
|
|
windowPos.flags = SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOOWNERZORDER |
|
|
SWP_NOZORDER | SWP_DEFERERASE | SWP_NOSENDCHANGING;
|
|
}
|
|
else {
|
|
// Not for WM_NCCALCSIZE
|
|
WINDOWPOS* arg = reinterpret_cast<WINDOWPOS*>(aLParam);
|
|
memcpy(&windowPos, arg, sizeof(windowPos));
|
|
|
|
NS_ASSERTION(aHWnd == windowPos.hwnd, "Mismatched hwnds!");
|
|
|
|
// Windows sends in some private flags sometimes that we can't simply copy.
|
|
// Filter here.
|
|
UINT mask = SWP_ASYNCWINDOWPOS | SWP_DEFERERASE | SWP_DRAWFRAME |
|
|
SWP_FRAMECHANGED | SWP_HIDEWINDOW | SWP_NOACTIVATE |
|
|
SWP_NOCOPYBITS | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREDRAW |
|
|
SWP_NOREPOSITION | SWP_NOSENDCHANGING | SWP_NOSIZE |
|
|
SWP_NOZORDER | SWP_SHOWWINDOW;
|
|
windowPos.flags &= mask;
|
|
}
|
|
}
|
|
|
|
void
|
|
DeferredWindowPosMessage::Run()
|
|
{
|
|
AssertWindowIsNotNeutered(windowPos.hwnd);
|
|
if (!IsWindow(windowPos.hwnd)) {
|
|
NS_ERROR("Invalid window!");
|
|
return;
|
|
}
|
|
|
|
if (!IsWindow(windowPos.hwndInsertAfter)) {
|
|
NS_WARNING("ZOrder change cannot be honored");
|
|
windowPos.hwndInsertAfter = 0;
|
|
windowPos.flags |= SWP_NOZORDER;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
BOOL ret =
|
|
#endif
|
|
SetWindowPos(windowPos.hwnd, windowPos.hwndInsertAfter, windowPos.x,
|
|
windowPos.y, windowPos.cx, windowPos.cy, windowPos.flags);
|
|
NS_ASSERTION(ret, "SetWindowPos failed!");
|
|
}
|
|
|
|
DeferredCopyDataMessage::DeferredCopyDataMessage(HWND aHWnd,
|
|
UINT aMessage,
|
|
WPARAM aWParam,
|
|
LPARAM aLParam)
|
|
: DeferredSendMessage(aHWnd, aMessage, aWParam, aLParam)
|
|
{
|
|
NS_ASSERTION(IsWindow(reinterpret_cast<HWND>(aWParam)), "Bad window!");
|
|
|
|
COPYDATASTRUCT* source = reinterpret_cast<COPYDATASTRUCT*>(aLParam);
|
|
NS_ASSERTION(source, "Should never be null!");
|
|
|
|
copyData.dwData = source->dwData;
|
|
copyData.cbData = source->cbData;
|
|
|
|
if (source->cbData) {
|
|
copyData.lpData = malloc(source->cbData);
|
|
if (copyData.lpData) {
|
|
memcpy(copyData.lpData, source->lpData, source->cbData);
|
|
}
|
|
else {
|
|
NS_ERROR("Out of memory?!");
|
|
copyData.cbData = 0;
|
|
}
|
|
}
|
|
else {
|
|
copyData.lpData = NULL;
|
|
}
|
|
|
|
lParam = reinterpret_cast<LPARAM>(©Data);
|
|
}
|
|
|
|
DeferredCopyDataMessage::~DeferredCopyDataMessage()
|
|
{
|
|
free(copyData.lpData);
|
|
}
|
|
|
|
DeferredStyleChangeMessage::DeferredStyleChangeMessage(HWND aHWnd,
|
|
WPARAM aWParam,
|
|
LPARAM aLParam)
|
|
: hWnd(aHWnd)
|
|
{
|
|
index = static_cast<int>(aWParam);
|
|
style = reinterpret_cast<STYLESTRUCT*>(aLParam)->styleNew;
|
|
}
|
|
|
|
void
|
|
DeferredStyleChangeMessage::Run()
|
|
{
|
|
SetWindowLongPtr(hWnd, index, style);
|
|
}
|
|
|
|
DeferredSetIconMessage::DeferredSetIconMessage(HWND aHWnd,
|
|
UINT aMessage,
|
|
WPARAM aWParam,
|
|
LPARAM aLParam)
|
|
: DeferredSendMessage(aHWnd, aMessage, aWParam, aLParam)
|
|
{
|
|
NS_ASSERTION(aMessage == WM_SETICON, "Wrong message type!");
|
|
}
|
|
|
|
void
|
|
DeferredSetIconMessage::Run()
|
|
{
|
|
AssertWindowIsNotNeutered(hWnd);
|
|
if (!IsWindow(hWnd)) {
|
|
NS_ERROR("Invalid window!");
|
|
return;
|
|
}
|
|
|
|
WNDPROC wndproc =
|
|
reinterpret_cast<WNDPROC>(GetWindowLongPtr(hWnd, GWLP_WNDPROC));
|
|
if (!wndproc) {
|
|
NS_ERROR("Invalid window procedure!");
|
|
return;
|
|
}
|
|
|
|
HICON hOld = reinterpret_cast<HICON>(
|
|
CallWindowProc(wndproc, hWnd, message, wParam, lParam));
|
|
if (hOld) {
|
|
DestroyIcon(hOld);
|
|
}
|
|
}
|