109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
// Copyright (c) 2016 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#include "cefclient/browser/main_message_loop_external_pump.h"
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#include <climits>
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#include "include/cef_app.h"
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#include "include/wrapper/cef_helpers.h"
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#include "cefclient/browser/main_message_loop.h"
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namespace client {
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namespace {
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// Special timer delay placeholder value. Intentionally 32-bit for Windows and
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// OS X platform API compatibility.
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const int32 kTimerDelayPlaceholder = INT_MAX;
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// The maximum number of milliseconds we're willing to wait between calls to
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// DoWork().
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const int64 kMaxTimerDelay = 1000 / 30; // 30fps
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client::MainMessageLoopExternalPump* g_external_message_pump = NULL;
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} // namespace
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MainMessageLoopExternalPump::MainMessageLoopExternalPump()
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: is_active_(false),
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reentrancy_detected_(false) {
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DCHECK(!g_external_message_pump);
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g_external_message_pump = this;
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}
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MainMessageLoopExternalPump::~MainMessageLoopExternalPump() {
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g_external_message_pump = NULL;
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}
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MainMessageLoopExternalPump* MainMessageLoopExternalPump::Get() {
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return g_external_message_pump;
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}
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void MainMessageLoopExternalPump::OnScheduleWork(int64 delay_ms) {
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REQUIRE_MAIN_THREAD();
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if (delay_ms == kTimerDelayPlaceholder && IsTimerPending()) {
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// Don't set the maximum timer requested from DoWork() if a timer event is
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// currently pending.
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return;
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}
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KillTimer();
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if (delay_ms <= 0) {
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// Execute the work immediately.
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DoWork();
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} else {
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// Never wait longer than the maximum allowed time.
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if (delay_ms > kMaxTimerDelay)
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delay_ms = kMaxTimerDelay;
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// Results in call to OnTimerTimeout() after the specified delay.
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SetTimer(delay_ms);
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}
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}
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void MainMessageLoopExternalPump::OnTimerTimeout() {
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REQUIRE_MAIN_THREAD();
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KillTimer();
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DoWork();
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}
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void MainMessageLoopExternalPump::DoWork() {
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const bool was_reentrant = PerformMessageLoopWork();
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if (was_reentrant) {
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// Execute the remaining work as soon as possible.
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OnScheduleMessagePumpWork(0);
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} else if (!IsTimerPending()) {
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// Schedule a timer event at the maximum allowed time. This may be dropped
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// in OnScheduleWork() if another timer event is already in-flight.
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OnScheduleMessagePumpWork(kTimerDelayPlaceholder);
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}
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}
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bool MainMessageLoopExternalPump::PerformMessageLoopWork() {
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if (is_active_) {
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// When CefDoMessageLoopWork() is called there may be various callbacks
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// (such as paint and IPC messages) that result in additional calls to this
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// method. If re-entrancy is detected we must repost a request again to the
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// owner thread to ensure that the discarded call is executed in the future.
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reentrancy_detected_ = true;
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return false;
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}
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reentrancy_detected_ = false;
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is_active_ = true;
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CefDoMessageLoopWork();
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is_active_ = false;
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// |reentrancy_detected_| may have changed due to re-entrant calls to this
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// method.
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return reentrancy_detected_;
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}
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} // namespace client
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