Add m-esr52 at 52.6.0

1 files changed, 547 insertions, 0 deletions

diff --git a/ipc/chromium/src/base/message_pump_win.cc b/ipc/chromium/src/base/message_pump_win.cc
new file mode 100644
index 000000000..407a47065
--- /dev/null
+++ b/ipc/chromium/src/base/message_pump_win.cc
@@ -0,0 +1,547 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/message_pump_win.h"
+
+#include <math.h>
+
+#include "base/message_loop.h"
+#include "base/histogram.h"
+#include "base/win_util.h"
+#include "WinUtils.h"
+
+using base::Time;
+
+namespace base {
+
+static const wchar_t kWndClass[] = L"Chrome_MessagePumpWindow";
+
+// Message sent to get an additional time slice for pumping (processing) another
+// task (a series of such messages creates a continuous task pump).
+static const int kMsgHaveWork = WM_USER + 1;
+
+//-----------------------------------------------------------------------------
+// MessagePumpWin public:
+
+void MessagePumpWin::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void MessagePumpWin::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void MessagePumpWin::WillProcessMessage(const MSG& msg) {
+  FOR_EACH_OBSERVER(Observer, observers_, WillProcessMessage(msg));
+}
+
+void MessagePumpWin::DidProcessMessage(const MSG& msg) {
+  FOR_EACH_OBSERVER(Observer, observers_, DidProcessMessage(msg));
+}
+
+void MessagePumpWin::RunWithDispatcher(
+    Delegate* delegate, Dispatcher* dispatcher) {
+  RunState s;
+  s.delegate = delegate;
+  s.dispatcher = dispatcher;
+  s.should_quit = false;
+  s.run_depth = state_ ? state_->run_depth + 1 : 1;
+
+  RunState* previous_state = state_;
+  state_ = &s;
+
+  DoRunLoop();
+
+  state_ = previous_state;
+}
+
+void MessagePumpWin::Quit() {
+  DCHECK(state_);
+  state_->should_quit = true;
+}
+
+//-----------------------------------------------------------------------------
+// MessagePumpWin protected:
+
+int MessagePumpWin::GetCurrentDelay() const {
+  if (delayed_work_time_.is_null())
+    return -1;
+
+  // Be careful here.  TimeDelta has a precision of microseconds, but we want a
+  // value in milliseconds.  If there are 5.5ms left, should the delay be 5 or
+  // 6?  It should be 6 to avoid executing delayed work too early.
+  double timeout =
+      ceil((delayed_work_time_ - TimeTicks::Now()).InMillisecondsF());
+
+  // If this value is negative, then we need to run delayed work soon.
+  int delay = static_cast<int>(timeout);
+  if (delay < 0)
+    delay = 0;
+
+  return delay;
+}
+
+//-----------------------------------------------------------------------------
+// MessagePumpForUI public:
+
+MessagePumpForUI::MessagePumpForUI() {
+  InitMessageWnd();
+}
+
+MessagePumpForUI::~MessagePumpForUI() {
+  DestroyWindow(message_hwnd_);
+  UnregisterClass(kWndClass, GetModuleHandle(NULL));
+}
+
+void MessagePumpForUI::ScheduleWork() {
+  if (InterlockedExchange(&have_work_, 1))
+    return;  // Someone else continued the pumping.
+
+  // Make sure the MessagePump does some work for us.
+  PostMessage(message_hwnd_, kMsgHaveWork, reinterpret_cast<WPARAM>(this), 0);
+
+  // In order to wake up any cross-process COM calls which may currently be
+  // pending on the main thread, we also have to post a UI message.
+  PostMessage(message_hwnd_, WM_NULL, 0, 0);
+}
+
+void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
+  //
+  // We would *like* to provide high resolution timers.  Windows timers using
+  // SetTimer() have a 10ms granularity.  We have to use WM_TIMER as a wakeup
+  // mechanism because the application can enter modal windows loops where it
+  // is not running our MessageLoop; the only way to have our timers fire in
+  // these cases is to post messages there.
+  //
+  // To provide sub-10ms timers, we process timers directly from our run loop.
+  // For the common case, timers will be processed there as the run loop does
+  // its normal work.  However, we *also* set the system timer so that WM_TIMER
+  // events fire.  This mops up the case of timers not being able to work in
+  // modal message loops.  It is possible for the SetTimer to pop and have no
+  // pending timers, because they could have already been processed by the
+  // run loop itself.
+  //
+  // We use a single SetTimer corresponding to the timer that will expire
+  // soonest.  As new timers are created and destroyed, we update SetTimer.
+  // Getting a spurrious SetTimer event firing is benign, as we'll just be
+  // processing an empty timer queue.
+  //
+  delayed_work_time_ = delayed_work_time;
+
+  int delay_msec = GetCurrentDelay();
+  DCHECK(delay_msec >= 0);
+  if (delay_msec < USER_TIMER_MINIMUM)
+    delay_msec = USER_TIMER_MINIMUM;
+
+  // Create a WM_TIMER event that will wake us up to check for any pending
+  // timers (in case we are running within a nested, external sub-pump).
+  SetTimer(message_hwnd_, reinterpret_cast<UINT_PTR>(this), delay_msec, NULL);
+}
+
+void MessagePumpForUI::PumpOutPendingPaintMessages() {
+  // If we are being called outside of the context of Run, then don't try to do
+  // any work.
+  if (!state_)
+    return;
+
+  // Create a mini-message-pump to force immediate processing of only Windows
+  // WM_PAINT messages.  Don't provide an infinite loop, but do enough peeking
+  // to get the job done.  Actual common max is 4 peeks, but we'll be a little
+  // safe here.
+  const int kMaxPeekCount = 20;
+  int peek_count;
+  for (peek_count = 0; peek_count < kMaxPeekCount; ++peek_count) {
+    MSG msg;
+    if (!PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_QS_PAINT))
+      break;
+    ProcessMessageHelper(msg);
+    if (state_->should_quit)  // Handle WM_QUIT.
+      break;
+  }
+  // Histogram what was really being used, to help to adjust kMaxPeekCount.
+  DHISTOGRAM_COUNTS("Loop.PumpOutPendingPaintMessages Peeks", peek_count);
+}
+
+//-----------------------------------------------------------------------------
+// MessagePumpForUI private:
+
+// static
+LRESULT CALLBACK MessagePumpForUI::WndProcThunk(
+    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
+  switch (message) {
+    case kMsgHaveWork:
+      reinterpret_cast<MessagePumpForUI*>(wparam)->HandleWorkMessage();
+      break;
+    case WM_TIMER:
+      reinterpret_cast<MessagePumpForUI*>(wparam)->HandleTimerMessage();
+      break;
+  }
+  return DefWindowProc(hwnd, message, wparam, lparam);
+}
+
+void MessagePumpForUI::DoRunLoop() {
+  // IF this was just a simple PeekMessage() loop (servicing all possible work
+  // queues), then Windows would try to achieve the following order according
+  // to MSDN documentation about PeekMessage with no filter):
+  //    * Sent messages
+  //    * Posted messages
+  //    * Sent messages (again)
+  //    * WM_PAINT messages
+  //    * WM_TIMER messages
+  //
+  // Summary: none of the above classes is starved, and sent messages has twice
+  // the chance of being processed (i.e., reduced service time).
+
+  for (;;) {
+    // If we do any work, we may create more messages etc., and more work may
+    // possibly be waiting in another task group.  When we (for example)
+    // ProcessNextWindowsMessage(), there is a good chance there are still more
+    // messages waiting.  On the other hand, when any of these methods return
+    // having done no work, then it is pretty unlikely that calling them again
+    // quickly will find any work to do.  Finally, if they all say they had no
+    // work, then it is a good time to consider sleeping (waiting) for more
+    // work.
+
+    bool more_work_is_plausible = ProcessNextWindowsMessage();
+    if (state_->should_quit)
+      break;
+
+    more_work_is_plausible |= state_->delegate->DoWork();
+    if (state_->should_quit)
+      break;
+
+    more_work_is_plausible |=
+        state_->delegate->DoDelayedWork(&delayed_work_time_);
+    // If we did not process any delayed work, then we can assume that our
+    // existing WM_TIMER if any will fire when delayed work should run.  We
+    // don't want to disturb that timer if it is already in flight.  However,
+    // if we did do all remaining delayed work, then lets kill the WM_TIMER.
+    if (more_work_is_plausible && delayed_work_time_.is_null())
+      KillTimer(message_hwnd_, reinterpret_cast<UINT_PTR>(this));
+    if (state_->should_quit)
+      break;
+
+    if (more_work_is_plausible)
+      continue;
+
+    more_work_is_plausible = state_->delegate->DoIdleWork();
+    if (state_->should_quit)
+      break;
+
+    if (more_work_is_plausible)
+      continue;
+
+    WaitForWork();  // Wait (sleep) until we have work to do again.
+  }
+}
+
+void MessagePumpForUI::InitMessageWnd() {
+  HINSTANCE hinst = GetModuleHandle(NULL);
+
+  WNDCLASSEX wc = {0};
+  wc.cbSize = sizeof(wc);
+  wc.lpfnWndProc = WndProcThunk;
+  wc.hInstance = hinst;
+  wc.lpszClassName = kWndClass;
+  RegisterClassEx(&wc);
+
+  message_hwnd_ =
+      CreateWindow(kWndClass, 0, 0, 0, 0, 0, 0, HWND_MESSAGE, 0, hinst, 0);
+  DCHECK(message_hwnd_);
+}
+
+void MessagePumpForUI::WaitForWork() {
+  // Wait until a message is available, up to the time needed by the timer
+  // manager to fire the next set of timers.
+  int delay = GetCurrentDelay();
+  if (delay < 0)  // Negative value means no timers waiting.
+    delay = INFINITE;
+
+  mozilla::widget::WinUtils::WaitForMessage(delay);
+}
+
+void MessagePumpForUI::HandleWorkMessage() {
+  // If we are being called outside of the context of Run, then don't try to do
+  // any work.  This could correspond to a MessageBox call or something of that
+  // sort.
+  if (!state_) {
+    // Since we handled a kMsgHaveWork message, we must still update this flag.
+    InterlockedExchange(&have_work_, 0);
+    return;
+  }
+
+  // Let whatever would have run had we not been putting messages in the queue
+  // run now.  This is an attempt to make our dummy message not starve other
+  // messages that may be in the Windows message queue.
+  ProcessPumpReplacementMessage();
+
+  // Now give the delegate a chance to do some work.  He'll let us know if he
+  // needs to do more work.
+  if (state_->delegate->DoWork())
+    ScheduleWork();
+}
+
+void MessagePumpForUI::HandleTimerMessage() {
+  KillTimer(message_hwnd_, reinterpret_cast<UINT_PTR>(this));
+
+  // If we are being called outside of the context of Run, then don't do
+  // anything.  This could correspond to a MessageBox call or something of
+  // that sort.
+  if (!state_)
+    return;
+
+  state_->delegate->DoDelayedWork(&delayed_work_time_);
+  if (!delayed_work_time_.is_null()) {
+    // A bit gratuitous to set delayed_work_time_ again, but oh well.
+    ScheduleDelayedWork(delayed_work_time_);
+  }
+}
+
+bool MessagePumpForUI::ProcessNextWindowsMessage() {
+  // If there are sent messages in the queue then PeekMessage internally
+  // dispatches the message and returns false. We return true in this
+  // case to ensure that the message loop peeks again instead of calling
+  // MsgWaitForMultipleObjectsEx again.
+  bool sent_messages_in_queue = false;
+  DWORD queue_status = GetQueueStatus(QS_SENDMESSAGE);
+  if (HIWORD(queue_status) & QS_SENDMESSAGE)
+    sent_messages_in_queue = true;
+
+  MSG msg;
+  if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
+    return ProcessMessageHelper(msg);
+
+  return sent_messages_in_queue;
+}
+
+bool MessagePumpForUI::ProcessMessageHelper(const MSG& msg) {
+  if (WM_QUIT == msg.message) {
+    // Repost the QUIT message so that it will be retrieved by the primary
+    // GetMessage() loop.
+    state_->should_quit = true;
+    PostQuitMessage(static_cast<int>(msg.wParam));
+    return false;
+  }
+
+  // While running our main message pump, we discard kMsgHaveWork messages.
+  if (msg.message == kMsgHaveWork && msg.hwnd == message_hwnd_)
+    return ProcessPumpReplacementMessage();
+
+  WillProcessMessage(msg);
+
+  if (state_->dispatcher) {
+    if (!state_->dispatcher->Dispatch(msg))
+      state_->should_quit = true;
+  } else {
+    TranslateMessage(&msg);
+    DispatchMessage(&msg);
+  }
+
+  DidProcessMessage(msg);
+  return true;
+}
+
+bool MessagePumpForUI::ProcessPumpReplacementMessage() {
+  // When we encounter a kMsgHaveWork message, this method is called to peek
+  // and process a replacement message, such as a WM_PAINT or WM_TIMER.  The
+  // goal is to make the kMsgHaveWork as non-intrusive as possible, even though
+  // a continuous stream of such messages are posted.  This method carefully
+  // peeks a message while there is no chance for a kMsgHaveWork to be pending,
+  // then resets the have_work_ flag (allowing a replacement kMsgHaveWork to
+  // possibly be posted), and finally dispatches that peeked replacement.  Note
+  // that the re-post of kMsgHaveWork may be asynchronous to this thread!!
+
+  MSG msg;
+  bool have_message = false;
+  if (MessageLoop::current()->os_modal_loop()) {
+    // We only peek out WM_PAINT and WM_TIMER here for reasons mentioned above.
+    have_message = PeekMessage(&msg, NULL, WM_PAINT, WM_PAINT, PM_REMOVE) ||
+                   PeekMessage(&msg, NULL, WM_TIMER, WM_TIMER, PM_REMOVE);
+  } else {
+    have_message = (0 != PeekMessage(&msg, NULL, 0, 0, PM_REMOVE));
+
+    if (have_message && msg.message == WM_NULL)
+      have_message = (0 != PeekMessage(&msg, NULL, 0, 0, PM_REMOVE));
+  }
+
+  DCHECK(!have_message || kMsgHaveWork != msg.message ||
+         msg.hwnd != message_hwnd_);
+
+  // Since we discarded a kMsgHaveWork message, we must update the flag.
+  int old_have_work = InterlockedExchange(&have_work_, 0);
+  DCHECK(old_have_work);
+
+  // We don't need a special time slice if we didn't have_message to process.
+  if (!have_message)
+    return false;
+
+  // Guarantee we'll get another time slice in the case where we go into native
+  // windows code.   This ScheduleWork() may hurt performance a tiny bit when
+  // tasks appear very infrequently, but when the event queue is busy, the
+  // kMsgHaveWork events get (percentage wise) rarer and rarer.
+  ScheduleWork();
+  return ProcessMessageHelper(msg);
+}
+
+//-----------------------------------------------------------------------------
+// MessagePumpForIO public:
+
+MessagePumpForIO::MessagePumpForIO() {
+  port_.Set(CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1));
+  DCHECK(port_.IsValid());
+}
+
+void MessagePumpForIO::ScheduleWork() {
+  if (InterlockedExchange(&have_work_, 1))
+    return;  // Someone else continued the pumping.
+
+  // Make sure the MessagePump does some work for us.
+  BOOL ret = PostQueuedCompletionStatus(port_, 0,
+                                        reinterpret_cast<ULONG_PTR>(this),
+                                        reinterpret_cast<OVERLAPPED*>(this));
+  DCHECK(ret);
+}
+
+void MessagePumpForIO::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
+  // We know that we can't be blocked right now since this method can only be
+  // called on the same thread as Run, so we only need to update our record of
+  // how long to sleep when we do sleep.
+  delayed_work_time_ = delayed_work_time;
+}
+
+void MessagePumpForIO::RegisterIOHandler(HANDLE file_handle,
+                                         IOHandler* handler) {
+  ULONG_PTR key = reinterpret_cast<ULONG_PTR>(handler);
+  HANDLE port = CreateIoCompletionPort(file_handle, port_, key, 1);
+  DCHECK(port == port_.Get());
+}
+
+//-----------------------------------------------------------------------------
+// MessagePumpForIO private:
+
+void MessagePumpForIO::DoRunLoop() {
+  for (;;) {
+    // If we do any work, we may create more messages etc., and more work may
+    // possibly be waiting in another task group.  When we (for example)
+    // WaitForIOCompletion(), there is a good chance there are still more
+    // messages waiting.  On the other hand, when any of these methods return
+    // having done no work, then it is pretty unlikely that calling them
+    // again quickly will find any work to do.  Finally, if they all say they
+    // had no work, then it is a good time to consider sleeping (waiting) for
+    // more work.
+
+    bool more_work_is_plausible = state_->delegate->DoWork();
+    if (state_->should_quit)
+      break;
+
+    more_work_is_plausible |= WaitForIOCompletion(0, NULL);
+    if (state_->should_quit)
+      break;
+
+    more_work_is_plausible |=
+        state_->delegate->DoDelayedWork(&delayed_work_time_);
+    if (state_->should_quit)
+      break;
+
+    if (more_work_is_plausible)
+      continue;
+
+    more_work_is_plausible = state_->delegate->DoIdleWork();
+    if (state_->should_quit)
+      break;
+
+    if (more_work_is_plausible)
+      continue;
+
+    WaitForWork();  // Wait (sleep) until we have work to do again.
+  }
+}
+
+// Wait until IO completes, up to the time needed by the timer manager to fire
+// the next set of timers.
+void MessagePumpForIO::WaitForWork() {
+  // We do not support nested IO message loops. This is to avoid messy
+  // recursion problems.
+  DCHECK(state_->run_depth == 1) << "Cannot nest an IO message loop!";
+
+  int timeout = GetCurrentDelay();
+  if (timeout < 0)  // Negative value means no timers waiting.
+    timeout = INFINITE;
+
+  WaitForIOCompletion(timeout, NULL);
+}
+
+bool MessagePumpForIO::WaitForIOCompletion(DWORD timeout, IOHandler* filter) {
+  IOItem item;
+  if (completed_io_.empty() || !MatchCompletedIOItem(filter, &item)) {
+    // We have to ask the system for another IO completion.
+    if (!GetIOItem(timeout, &item))
+      return false;
+
+    if (ProcessInternalIOItem(item))
+      return true;
+  }
+
+  if (item.context->handler) {
+    if (filter && item.handler != filter) {
+      // Save this item for later
+      completed_io_.push_back(item);
+    } else {
+      DCHECK(item.context->handler == item.handler);
+      item.handler->OnIOCompleted(item.context, item.bytes_transfered,
+                                  item.error);
+    }
+  } else {
+    // The handler must be gone by now, just cleanup the mess.
+    delete item.context;
+  }
+  return true;
+}
+
+// Asks the OS for another IO completion result.
+bool MessagePumpForIO::GetIOItem(DWORD timeout, IOItem* item) {
+  memset(item, 0, sizeof(*item));
+  ULONG_PTR key = 0;
+  OVERLAPPED* overlapped = NULL;
+  if (!GetQueuedCompletionStatus(port_.Get(), &item->bytes_transfered, &key,
+                                 &overlapped, timeout)) {
+    if (!overlapped)
+      return false;  // Nothing in the queue.
+    item->error = GetLastError();
+    item->bytes_transfered = 0;
+  }
+
+  item->handler = reinterpret_cast<IOHandler*>(key);
+  item->context = reinterpret_cast<IOContext*>(overlapped);
+  return true;
+}
+
+bool MessagePumpForIO::ProcessInternalIOItem(const IOItem& item) {
+  if (this == reinterpret_cast<MessagePumpForIO*>(item.context) &&
+      this == reinterpret_cast<MessagePumpForIO*>(item.handler)) {
+    // This is our internal completion.
+    DCHECK(!item.bytes_transfered);
+    InterlockedExchange(&have_work_, 0);
+    return true;
+  }
+  return false;
+}
+
+// Returns a completion item that was previously received.
+bool MessagePumpForIO::MatchCompletedIOItem(IOHandler* filter, IOItem* item) {
+  DCHECK(!completed_io_.empty());
+  for (std::list<IOItem>::iterator it = completed_io_.begin();
+       it != completed_io_.end(); ++it) {
+    if (!filter || it->handler == filter) {
+      *item = *it;
+      completed_io_.erase(it);
+      return true;
+    }
+  }
+  return false;
+}
+
+}  // namespace base