cef/tests/cefclient/browser/main_message_loop_multithre...

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// Copyright (c) 2018 The Chromium Embedded Framework 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 "tests/cefclient/browser/main_message_loop_multithreaded_gtk.h"
#include <X11/Xlib.h>
#include <gtk/gtk.h>
#include "include/base/cef_callback.h"
#include "include/base/cef_logging.h"
#include "include/wrapper/cef_closure_task.h"
namespace client {
namespace {
base::Lock g_global_lock;
base::PlatformThreadId g_global_lock_thread = kInvalidPlatformThreadId;
void lock_enter() {
// The GDK lock is not reentrant, so check that we're using it correctly.
// See comments on ScopedGdkThreadsEnter.
base::PlatformThreadId current_thread = base::PlatformThread::CurrentId();
CHECK(current_thread != g_global_lock_thread);
g_global_lock.Acquire();
g_global_lock_thread = current_thread;
}
void lock_leave() {
g_global_lock_thread = kInvalidPlatformThreadId;
g_global_lock.Release();
}
// Same as g_idle_add() but specifying the GMainContext.
guint idle_add(GMainContext* main_context,
GSourceFunc function,
gpointer data) {
GSource* source = g_idle_source_new();
g_source_set_callback(source, function, data, nullptr);
guint id = g_source_attach(source, main_context);
g_source_unref(source);
return id;
}
// Same as g_timeout_add() but specifying the GMainContext.
guint timeout_add(GMainContext* main_context,
guint interval,
GSourceFunc function,
gpointer data) {
GSource* source = g_timeout_source_new(interval);
g_source_set_callback(source, function, data, nullptr);
guint id = g_source_attach(source, main_context);
g_source_unref(source);
return id;
}
} // namespace
MainMessageLoopMultithreadedGtk::MainMessageLoopMultithreadedGtk()
: thread_id_(base::PlatformThread::CurrentId()) {
// Initialize Xlib support for concurrent threads. This function must be the
// first Xlib function a multi-threaded program calls, and it must complete
// before any other Xlib call is made.
CHECK(XInitThreads() != 0);
// Initialize GDK thread support. See comments on ScopedGdkThreadsEnter.
gdk_threads_set_lock_functions(lock_enter, lock_leave);
gdk_threads_init();
}
MainMessageLoopMultithreadedGtk::~MainMessageLoopMultithreadedGtk() {
DCHECK(RunsTasksOnCurrentThread());
DCHECK(queued_tasks_.empty());
}
int MainMessageLoopMultithreadedGtk::Run() {
DCHECK(RunsTasksOnCurrentThread());
// We use the default Glib context and Chromium creates its own context in
// MessagePumpGlib (starting in M86).
main_context_ = g_main_context_default();
main_loop_ = g_main_loop_new(main_context_, TRUE);
// Check the queue when GTK is idle, or at least every 100ms.
// TODO(cef): It might be more efficient to use input functions
// (gdk_input_add) and trigger by writing to an fd.
idle_add(main_context_, MainMessageLoopMultithreadedGtk::TriggerRunTasks,
this);
timeout_add(main_context_, 100,
MainMessageLoopMultithreadedGtk::TriggerRunTasks, this);
// Block until g_main_loop_quit().
g_main_loop_run(main_loop_);
// Release GLib resources.
g_main_loop_unref(main_loop_);
main_loop_ = nullptr;
main_context_ = nullptr;
return 0;
}
void MainMessageLoopMultithreadedGtk::Quit() {
PostTask(CefCreateClosureTask(base::BindOnce(
&MainMessageLoopMultithreadedGtk::DoQuit, base::Unretained(this))));
}
void MainMessageLoopMultithreadedGtk::PostTask(CefRefPtr<CefTask> task) {
base::AutoLock lock_scope(lock_);
// Queue the task.
queued_tasks_.push(task);
}
bool MainMessageLoopMultithreadedGtk::RunsTasksOnCurrentThread() const {
return (thread_id_ == base::PlatformThread::CurrentId());
}
// static
int MainMessageLoopMultithreadedGtk::TriggerRunTasks(void* self) {
static_cast<MainMessageLoopMultithreadedGtk*>(self)->RunTasks();
return G_SOURCE_CONTINUE;
}
void MainMessageLoopMultithreadedGtk::RunTasks() {
DCHECK(RunsTasksOnCurrentThread());
std::queue<CefRefPtr<CefTask>> tasks;
{
base::AutoLock lock_scope(lock_);
tasks.swap(queued_tasks_);
}
// Execute all queued tasks.
while (!tasks.empty()) {
CefRefPtr<CefTask> task = tasks.front();
tasks.pop();
task->Execute();
}
}
void MainMessageLoopMultithreadedGtk::DoQuit() {
DCHECK(RunsTasksOnCurrentThread());
g_main_loop_quit(main_loop_);
}
} // namespace client