79 lines
3.1 KiB
Diff
79 lines
3.1 KiB
Diff
diff --git base/message_loop/message_loop_current.cc base/message_loop/message_loop_current.cc
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index 7688ba3d7b0d..9acaaa0d5c7f 100644
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--- base/message_loop/message_loop_current.cc
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+++ base/message_loop/message_loop_current.cc
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@@ -47,6 +47,8 @@ void MessageLoopCurrent::AddDestructionObserver(
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void MessageLoopCurrent::RemoveDestructionObserver(
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DestructionObserver* destruction_observer) {
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+ if (!current_)
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+ return;
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DCHECK(current_->IsBoundToCurrentThread());
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current_->RemoveDestructionObserver(destruction_observer);
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}
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diff --git base/message_loop/message_loop_current.h base/message_loop/message_loop_current.h
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index a3b48b58d367..57f8dc7fe2fa 100644
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--- base/message_loop/message_loop_current.h
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+++ base/message_loop/message_loop_current.h
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@@ -120,6 +120,12 @@ class BASE_EXPORT MessageLoopCurrent {
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// posted tasks.
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void SetAddQueueTimeToTasks(bool enable);
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+#if defined(OS_WIN)
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+ void set_os_modal_loop(bool os_modal_loop) { os_modal_loop_ = os_modal_loop; }
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+
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+ bool os_modal_loop() const { return os_modal_loop_; }
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+#endif // OS_WIN
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+
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// Enables or disables the recursive task processing. This happens in the case
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// of recursive message loops. Some unwanted message loops may occur when
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// using common controls or printer functions. By default, recursive task
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@@ -190,6 +196,13 @@ class BASE_EXPORT MessageLoopCurrent {
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friend class web::WebTaskEnvironment;
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sequence_manager::internal::SequenceManagerImpl* current_;
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+
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+#if defined(OS_WIN)
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+ private:
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+ // Should be set to true before calling Windows APIs like TrackPopupMenu, etc.
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+ // which enter a modal message loop.
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+ bool os_modal_loop_ = false;
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+#endif
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};
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#if !defined(OS_NACL)
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diff --git base/message_loop/message_pump_win.cc base/message_loop/message_pump_win.cc
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index 3e9562cc4cc5..cf4a700364d3 100644
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--- base/message_loop/message_pump_win.cc
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+++ base/message_loop/message_pump_win.cc
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@@ -2,6 +2,7 @@
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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+#include "base/message_loop/message_loop_current.h"
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#include "base/message_loop/message_pump_win.h"
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#include <algorithm>
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@@ -493,10 +494,18 @@ bool MessagePumpForUI::ProcessPumpReplacementMessage() {
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// asynchronous to this thread!!
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MSG msg;
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- const bool have_message =
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- ::PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE) != FALSE;
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+ bool have_message = false;
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+ // We should not process all window messages if we are in the context of an
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+ // OS modal loop, i.e. in the context of a windows API call like MessageBox.
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+ // This is to ensure that these messages are peeked out by the OS modal loop.
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+ if (MessageLoopCurrent::Get()->os_modal_loop()) {
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+ // We only peek out WM_PAINT and WM_TIMER here for reasons mentioned above.
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+ have_message = PeekMessage(&msg, NULL, WM_PAINT, WM_PAINT, PM_REMOVE) ||
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+ PeekMessage(&msg, NULL, WM_TIMER, WM_TIMER, PM_REMOVE);
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+ } else {
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+ have_message = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) != FALSE;
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+ }
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- // Expect no message or a message different than kMsgHaveWork.
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DCHECK(!have_message || kMsgHaveWork != msg.message ||
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msg.hwnd != message_window_.hwnd());
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