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Unified Diff: base/message_pump_win.cc

Issue 17078005: Move message_pump to base/message_loop. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 7 years, 6 months ago
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Index: base/message_pump_win.cc
diff --git a/base/message_pump_win.cc b/base/message_pump_win.cc
deleted file mode 100644
index dcbb3201cd8f57c38d6a3b744727d514559df336..0000000000000000000000000000000000000000
--- a/base/message_pump_win.cc
+++ /dev/null
@@ -1,686 +0,0 @@
-// Copyright (c) 2012 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/debug/trace_event.h"
-#include "base/message_loop.h"
-#include "base/metrics/histogram.h"
-#include "base/process_util.h"
-#include "base/stringprintf.h"
-#include "base/win/wrapped_window_proc.h"
-
-namespace {
-
-enum MessageLoopProblems {
- MESSAGE_POST_ERROR,
- COMPLETION_POST_ERROR,
- SET_TIMER_ERROR,
- MESSAGE_LOOP_PROBLEM_MAX,
-};
-
-} // namespace
-
-namespace base {
-
-static const wchar_t kWndClassFormat[] = L"Chrome_MessagePumpWindow_%p";
-
-// 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(MessagePumpObserver* observer) {
- observers_.AddObserver(observer);
-}
-
-void MessagePumpWin::RemoveObserver(MessagePumpObserver* observer) {
- observers_.RemoveObserver(observer);
-}
-
-void MessagePumpWin::WillProcessMessage(const MSG& msg) {
- FOR_EACH_OBSERVER(MessagePumpObserver, observers_, WillProcessEvent(msg));
-}
-
-void MessagePumpWin::DidProcessMessage(const MSG& msg) {
- FOR_EACH_OBSERVER(MessagePumpObserver, observers_, DidProcessEvent(msg));
-}
-
-void MessagePumpWin::RunWithDispatcher(
- Delegate* delegate, MessagePumpDispatcher* 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()
- : atom_(0),
- message_filter_(new MessageFilter) {
- InitMessageWnd();
-}
-
-MessagePumpForUI::~MessagePumpForUI() {
- DestroyWindow(message_hwnd_);
- UnregisterClass(MAKEINTATOM(atom_),
- base::GetModuleFromAddress(&WndProcThunk));
-}
-
-void MessagePumpForUI::ScheduleWork() {
- if (InterlockedExchange(&have_work_, 1))
- return; // Someone else continued the pumping.
-
- // Make sure the MessagePump does some work for us.
- BOOL ret = PostMessage(message_hwnd_, kMsgHaveWork,
- reinterpret_cast<WPARAM>(this), 0);
- if (ret)
- return; // There was room in the Window Message queue.
-
- // We have failed to insert a have-work message, so there is a chance that we
- // will starve tasks/timers while sitting in a nested message loop. Nested
- // loops only look at Windows Message queues, and don't look at *our* task
- // queues, etc., so we might not get a time slice in such. :-(
- // We could abort here, but the fear is that this failure mode is plausibly
- // common (queue is full, of about 2000 messages), so we'll do a near-graceful
- // recovery. Nested loops are pretty transient (we think), so this will
- // probably be recoverable.
- InterlockedExchange(&have_work_, 0); // Clarify that we didn't really insert.
- UMA_HISTOGRAM_ENUMERATION("Chrome.MessageLoopProblem", MESSAGE_POST_ERROR,
- MESSAGE_LOOP_PROBLEM_MAX);
-}
-
-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_GE(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).
- BOOL ret = SetTimer(message_hwnd_, reinterpret_cast<UINT_PTR>(this),
- delay_msec, NULL);
- if (ret)
- return;
- // If we can't set timers, we are in big trouble... but cross our fingers for
- // now.
- // TODO(jar): If we don't see this error, use a CHECK() here instead.
- UMA_HISTOGRAM_ENUMERATION("Chrome.MessageLoopProblem", SET_TIMER_ERROR,
- MESSAGE_LOOP_PROBLEM_MAX);
-}
-
-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() {
- // Generate a unique window class name.
- string16 class_name = base::StringPrintf(kWndClassFormat, this);
-
- HINSTANCE instance = base::GetModuleFromAddress(&WndProcThunk);
- WNDCLASSEX wc = {0};
- wc.cbSize = sizeof(wc);
- wc.lpfnWndProc = base::win::WrappedWindowProc<WndProcThunk>;
- wc.hInstance = instance;
- wc.lpszClassName = class_name.c_str();
- atom_ = RegisterClassEx(&wc);
- DCHECK(atom_);
-
- message_hwnd_ = CreateWindow(MAKEINTATOM(atom_), 0, 0, 0, 0, 0, 0,
- HWND_MESSAGE, 0, instance, 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;
-
- DWORD result;
- result = MsgWaitForMultipleObjectsEx(0, NULL, delay, QS_ALLINPUT,
- MWMO_INPUTAVAILABLE);
-
- if (WAIT_OBJECT_0 == result) {
- // A WM_* message is available.
- // If a parent child relationship exists between windows across threads
- // then their thread inputs are implicitly attached.
- // This causes the MsgWaitForMultipleObjectsEx API to return indicating
- // that messages are ready for processing (Specifically, mouse messages
- // intended for the child window may appear if the child window has
- // capture).
- // The subsequent PeekMessages call may fail to return any messages thus
- // causing us to enter a tight loop at times.
- // The WaitMessage call below is a workaround to give the child window
- // some time to process its input messages.
- MSG msg = {0};
- DWORD queue_status = GetQueueStatus(QS_MOUSE);
- if (HIWORD(queue_status) & QS_MOUSE &&
- !PeekMessage(&msg, NULL, WM_MOUSEFIRST, WM_MOUSELAST, PM_NOREMOVE)) {
- WaitMessage();
- }
- return;
- }
-
- DCHECK_NE(WAIT_FAILED, result) << GetLastError();
-}
-
-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 (message_filter_->DoPeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
- return ProcessMessageHelper(msg);
-
- return sent_messages_in_queue;
-}
-
-bool MessagePumpForUI::ProcessMessageHelper(const MSG& msg) {
- TRACE_EVENT1("base", "MessagePumpForUI::ProcessMessageHelper",
- "message", msg.message);
- 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();
-
- if (CallMsgFilter(const_cast<MSG*>(&msg), kMessageFilterCode))
- return true;
-
- WillProcessMessage(msg);
-
- if (!message_filter_->ProcessMessage(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!!
-
- bool have_message = false;
- MSG msg;
- // We should not process all window messages if we are in the context of an
- // OS modal loop, i.e. in the context of a windows API call like MessageBox.
- // This is to ensure that these messages are peeked out by the OS modal loop.
- 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 = !!message_filter_->DoPeekMessage(&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);
-}
-
-void MessagePumpForUI::SetMessageFilter(
- scoped_ptr<MessageFilter> message_filter) {
- message_filter_ = message_filter.Pass();
-}
-
-//-----------------------------------------------------------------------------
-// MessagePumpForIO public:
-
-MessagePumpForIO::MessagePumpForIO() {
- port_.Set(CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, 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));
- if (ret)
- return; // Post worked perfectly.
-
- // See comment in MessagePumpForUI::ScheduleWork() for this error recovery.
- InterlockedExchange(&have_work_, 0); // Clarify that we didn't succeed.
- UMA_HISTOGRAM_ENUMERATION("Chrome.MessageLoopProblem", COMPLETION_POST_ERROR,
- MESSAGE_LOOP_PROBLEM_MAX);
-}
-
-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 = HandlerToKey(handler, true);
- HANDLE port = CreateIoCompletionPort(file_handle, port_, key, 1);
- DPCHECK(port);
-}
-
-bool MessagePumpForIO::RegisterJobObject(HANDLE job_handle,
- IOHandler* handler) {
- // Job object notifications use the OVERLAPPED pointer to carry the message
- // data. Mark the completion key correspondingly, so we will not try to
- // convert OVERLAPPED* to IOContext*.
- ULONG_PTR key = HandlerToKey(handler, false);
- JOBOBJECT_ASSOCIATE_COMPLETION_PORT info;
- info.CompletionKey = reinterpret_cast<void*>(key);
- info.CompletionPort = port_;
- return SetInformationJobObject(job_handle,
- JobObjectAssociateCompletionPortInformation,
- &info,
- sizeof(info)) != FALSE;
-}
-
-//-----------------------------------------------------------------------------
-// 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_EQ(1, state_->run_depth) << "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.has_valid_io_context| is false then |item.context| does not point
- // to a context structure, and so should not be dereferenced, although it may
- // still hold valid non-pointer data.
- if (!item.has_valid_io_context || item.context->handler) {
- if (filter && item.handler != filter) {
- // Save this item for later
- completed_io_.push_back(item);
- } else {
- DCHECK(!item.has_valid_io_context ||
- (item.context->handler == item.handler));
- WillProcessIOEvent();
- item.handler->OnIOCompleted(item.context, item.bytes_transfered,
- item.error);
- DidProcessIOEvent();
- }
- } 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 = NULL;
- 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 = KeyToHandler(key, &item->has_valid_io_context);
- 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;
-}
-
-void MessagePumpForIO::AddIOObserver(IOObserver *obs) {
- io_observers_.AddObserver(obs);
-}
-
-void MessagePumpForIO::RemoveIOObserver(IOObserver *obs) {
- io_observers_.RemoveObserver(obs);
-}
-
-void MessagePumpForIO::WillProcessIOEvent() {
- FOR_EACH_OBSERVER(IOObserver, io_observers_, WillProcessIOEvent());
-}
-
-void MessagePumpForIO::DidProcessIOEvent() {
- FOR_EACH_OBSERVER(IOObserver, io_observers_, DidProcessIOEvent());
-}
-
-// static
-ULONG_PTR MessagePumpForIO::HandlerToKey(IOHandler* handler,
- bool has_valid_io_context) {
- ULONG_PTR key = reinterpret_cast<ULONG_PTR>(handler);
-
- // |IOHandler| is at least pointer-size aligned, so the lowest two bits are
- // always cleared. We use the lowest bit to distinguish completion keys with
- // and without the associated |IOContext|.
- DCHECK((key & 1) == 0);
-
- // Mark the completion key as context-less.
- if (!has_valid_io_context)
- key = key | 1;
- return key;
-}
-
-// static
-MessagePumpForIO::IOHandler* MessagePumpForIO::KeyToHandler(
- ULONG_PTR key,
- bool* has_valid_io_context) {
- *has_valid_io_context = ((key & 1) == 0);
- return reinterpret_cast<IOHandler*>(key & ~static_cast<ULONG_PTR>(1));
-}
-
-} // namespace base
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