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Side by Side Diff: base/message_loop/message_pump_win.cc

Issue 1992243003: Remove MessageLoop::os_modal_loop_. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 7 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "base/message_loop/message_pump_win.h" 5 #include "base/message_loop/message_pump_win.h"
6 6
7 #include <math.h> 7 #include <math.h>
8 #include <stdint.h> 8 #include <stdint.h>
9 9
10 #include <limits> 10 #include <limits>
11 11
12 #include "base/message_loop/message_loop.h"
13 #include "base/metrics/histogram.h" 12 #include "base/metrics/histogram.h"
14 #include "base/strings/stringprintf.h" 13 #include "base/strings/stringprintf.h"
15 #include "base/trace_event/trace_event.h" 14 #include "base/trace_event/trace_event.h"
16 #include "base/win/current_module.h" 15 #include "base/win/current_module.h"
17 #include "base/win/wrapped_window_proc.h" 16 #include "base/win/wrapped_window_proc.h"
18 17
19 namespace base { 18 namespace base {
20 19
21 namespace { 20 namespace {
22 21
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378 if (CallMsgFilter(const_cast<MSG*>(&msg), kMessageFilterCode)) 377 if (CallMsgFilter(const_cast<MSG*>(&msg), kMessageFilterCode))
379 return true; 378 return true;
380 379
381 TranslateMessage(&msg); 380 TranslateMessage(&msg);
382 DispatchMessage(&msg); 381 DispatchMessage(&msg);
383 382
384 return true; 383 return true;
385 } 384 }
386 385
387 bool MessagePumpForUI::ProcessPumpReplacementMessage() { 386 bool MessagePumpForUI::ProcessPumpReplacementMessage() {
388 // When we encounter a kMsgHaveWork message, this method is called to peek 387 // When we encounter a kMsgHaveWork message, this method is called to peek and
389 // and process a replacement message, such as a WM_PAINT or WM_TIMER. The 388 // process a replacement message. The goal is to make the kMsgHaveWork as non-
390 // goal is to make the kMsgHaveWork as non-intrusive as possible, even though 389 // intrusive as possible, even though a continuous stream of such messages are
391 // a continuous stream of such messages are posted. This method carefully 390 // posted. This method carefully peeks a message while there is no chance for
392 // peeks a message while there is no chance for a kMsgHaveWork to be pending, 391 // a kMsgHaveWork to be pending, then resets the |have_work_| flag (allowing a
393 // then resets the have_work_ flag (allowing a replacement kMsgHaveWork to 392 // replacement kMsgHaveWork to possibly be posted), and finally dispatches
394 // possibly be posted), and finally dispatches that peeked replacement. Note 393 // that peeked replacement. Note that the re-post of kMsgHaveWork may be
395 // that the re-post of kMsgHaveWork may be asynchronous to this thread!! 394 // asynchronous to this thread!!
396 395
397 bool have_message = false;
398 MSG msg; 396 MSG msg;
399 // We should not process all window messages if we are in the context of an 397 const bool have_message = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) != FALSE;
400 // OS modal loop, i.e. in the context of a windows API call like MessageBox.
401 // This is to ensure that these messages are peeked out by the OS modal loop.
402 if (MessageLoop::current()->os_modal_loop()) {
403 // We only peek out WM_PAINT and WM_TIMER here for reasons mentioned above.
404 have_message = PeekMessage(&msg, NULL, WM_PAINT, WM_PAINT, PM_REMOVE) ||
405 PeekMessage(&msg, NULL, WM_TIMER, WM_TIMER, PM_REMOVE);
406 } else {
407 have_message = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) != FALSE;
408 }
409 398
399 // Expect no message or a message different than kMsgHaveWork.
410 DCHECK(!have_message || kMsgHaveWork != msg.message || 400 DCHECK(!have_message || kMsgHaveWork != msg.message ||
411 msg.hwnd != message_hwnd_); 401 msg.hwnd != message_hwnd_);
412 402
413 // Since we discarded a kMsgHaveWork message, we must update the flag. 403 // Since we discarded a kMsgHaveWork message, we must update the flag.
414 int old_have_work = InterlockedExchange(&have_work_, 0); 404 int old_have_work = InterlockedExchange(&have_work_, 0);
415 DCHECK(old_have_work); 405 DCHECK(old_have_work);
416 406
417 // We don't need a special time slice if we didn't have_message to process. 407 // We don't need a special time slice if we didn't have_message to process.
418 if (!have_message) 408 if (!have_message)
419 return false; 409 return false;
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597 if (!filter || it->handler == filter) { 587 if (!filter || it->handler == filter) {
598 *item = *it; 588 *item = *it;
599 completed_io_.erase(it); 589 completed_io_.erase(it);
600 return true; 590 return true;
601 } 591 }
602 } 592 }
603 return false; 593 return false;
604 } 594 }
605 595
606 } // namespace base 596 } // namespace base
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