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277 lines
8.7 KiB
C++
277 lines
8.7 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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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_pump_libevent.h"
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#include <unistd.h>
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#include "base/bind.h"
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#include "base/bind_helpers.h"
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#include "base/files/file_util.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/message_loop/message_loop.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/run_loop.h"
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#include "base/synchronization/waitable_event.h"
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#include "base/synchronization/waitable_event_watcher.h"
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#include "base/threading/thread.h"
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#include "testing/gtest/include/gtest/gtest.h"
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#include "third_party/libevent/event.h"
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namespace base {
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class MessagePumpLibeventTest : public testing::Test {
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protected:
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MessagePumpLibeventTest()
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: ui_loop_(new MessageLoop(MessageLoop::TYPE_UI)),
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io_thread_("MessagePumpLibeventTestIOThread") {}
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~MessagePumpLibeventTest() override {}
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void SetUp() override {
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Thread::Options options(MessageLoop::TYPE_IO, 0);
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ASSERT_TRUE(io_thread_.StartWithOptions(options));
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ASSERT_EQ(MessageLoop::TYPE_IO, io_thread_.message_loop()->type());
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int ret = pipe(pipefds_);
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ASSERT_EQ(0, ret);
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}
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void TearDown() override {
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if (IGNORE_EINTR(close(pipefds_[0])) < 0)
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PLOG(ERROR) << "close";
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if (IGNORE_EINTR(close(pipefds_[1])) < 0)
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PLOG(ERROR) << "close";
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}
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MessageLoopForIO* io_loop() const {
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return static_cast<MessageLoopForIO*>(io_thread_.message_loop());
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}
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void OnLibeventNotification(
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MessagePumpLibevent* pump,
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MessagePumpLibevent::FileDescriptorWatcher* controller) {
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pump->OnLibeventNotification(0, EV_WRITE | EV_READ, controller);
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}
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int pipefds_[2];
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scoped_ptr<MessageLoop> ui_loop_;
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private:
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Thread io_thread_;
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};
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namespace {
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// Concrete implementation of MessagePumpLibevent::Watcher that does
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// nothing useful.
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class StupidWatcher : public MessagePumpLibevent::Watcher {
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public:
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~StupidWatcher() override {}
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// base:MessagePumpLibevent::Watcher interface
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void OnFileCanReadWithoutBlocking(int fd) override {}
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void OnFileCanWriteWithoutBlocking(int fd) override {}
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};
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#if GTEST_HAS_DEATH_TEST && !defined(NDEBUG)
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// Test to make sure that we catch calling WatchFileDescriptor off of the
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// wrong thread.
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#if defined(OS_CHROMEOS) || defined(OS_LINUX)
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// Flaky on Chrome OS and Linux: crbug.com/138845.
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#define MAYBE_TestWatchingFromBadThread DISABLED_TestWatchingFromBadThread
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#else
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#define MAYBE_TestWatchingFromBadThread TestWatchingFromBadThread
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#endif
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TEST_F(MessagePumpLibeventTest, MAYBE_TestWatchingFromBadThread) {
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MessagePumpLibevent::FileDescriptorWatcher watcher;
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StupidWatcher delegate;
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ASSERT_DEATH(io_loop()->WatchFileDescriptor(
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STDOUT_FILENO, false, MessageLoopForIO::WATCH_READ, &watcher, &delegate),
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"Check failed: "
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"watch_file_descriptor_caller_checker_.CalledOnValidThread\\(\\)");
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}
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TEST_F(MessagePumpLibeventTest, QuitOutsideOfRun) {
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scoped_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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ASSERT_DEATH(pump->Quit(), "Check failed: in_run_. "
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"Quit was called outside of Run!");
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}
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#endif // GTEST_HAS_DEATH_TEST && !defined(NDEBUG)
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class BaseWatcher : public MessagePumpLibevent::Watcher {
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public:
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explicit BaseWatcher(MessagePumpLibevent::FileDescriptorWatcher* controller)
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: controller_(controller) {
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DCHECK(controller_);
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}
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~BaseWatcher() override {}
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// base:MessagePumpLibevent::Watcher interface
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void OnFileCanReadWithoutBlocking(int /* fd */) override { NOTREACHED(); }
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void OnFileCanWriteWithoutBlocking(int /* fd */) override { NOTREACHED(); }
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protected:
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MessagePumpLibevent::FileDescriptorWatcher* controller_;
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};
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class DeleteWatcher : public BaseWatcher {
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public:
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explicit DeleteWatcher(
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MessagePumpLibevent::FileDescriptorWatcher* controller)
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: BaseWatcher(controller) {}
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~DeleteWatcher() override { DCHECK(!controller_); }
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {
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DCHECK(controller_);
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delete controller_;
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controller_ = NULL;
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}
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};
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TEST_F(MessagePumpLibeventTest, DeleteWatcher) {
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scoped_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FileDescriptorWatcher* watcher =
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new MessagePumpLibevent::FileDescriptorWatcher;
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DeleteWatcher delegate(watcher);
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ_WRITE, watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), watcher);
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}
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class StopWatcher : public BaseWatcher {
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public:
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explicit StopWatcher(
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MessagePumpLibevent::FileDescriptorWatcher* controller)
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: BaseWatcher(controller) {}
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~StopWatcher() override {}
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {
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controller_->StopWatchingFileDescriptor();
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}
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};
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TEST_F(MessagePumpLibeventTest, StopWatcher) {
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scoped_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FileDescriptorWatcher watcher;
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StopWatcher delegate(&watcher);
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ_WRITE, &watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), &watcher);
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}
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void QuitMessageLoopAndStart(const Closure& quit_closure) {
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quit_closure.Run();
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MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
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RunLoop runloop;
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MessageLoop::current()->PostTask(FROM_HERE, runloop.QuitClosure());
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runloop.Run();
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}
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class NestedPumpWatcher : public MessagePumpLibevent::Watcher {
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public:
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NestedPumpWatcher() {}
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~NestedPumpWatcher() override {}
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void OnFileCanReadWithoutBlocking(int /* fd */) override {
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RunLoop runloop;
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MessageLoop::current()->PostTask(FROM_HERE, Bind(&QuitMessageLoopAndStart,
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runloop.QuitClosure()));
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runloop.Run();
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}
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void OnFileCanWriteWithoutBlocking(int /* fd */) override {}
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};
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TEST_F(MessagePumpLibeventTest, NestedPumpWatcher) {
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scoped_ptr<MessagePumpLibevent> pump(new MessagePumpLibevent);
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MessagePumpLibevent::FileDescriptorWatcher watcher;
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NestedPumpWatcher delegate;
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pump->WatchFileDescriptor(pipefds_[1],
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false, MessagePumpLibevent::WATCH_READ, &watcher, &delegate);
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// Spoof a libevent notification.
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OnLibeventNotification(pump.get(), &watcher);
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}
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void FatalClosure() {
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FAIL() << "Reached fatal closure.";
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}
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class QuitWatcher : public BaseWatcher {
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public:
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QuitWatcher(MessagePumpLibevent::FileDescriptorWatcher* controller,
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RunLoop* run_loop)
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: BaseWatcher(controller), run_loop_(run_loop) {}
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~QuitWatcher() override {}
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void OnFileCanReadWithoutBlocking(int /* fd */) override {
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// Post a fatal closure to the MessageLoop before we quit it.
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MessageLoop::current()->PostTask(FROM_HERE, Bind(&FatalClosure));
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// Now quit the MessageLoop.
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run_loop_->Quit();
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}
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private:
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RunLoop* run_loop_; // weak
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};
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void WriteFDWrapper(const int fd,
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const char* buf,
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int size,
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WaitableEvent* event) {
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ASSERT_TRUE(WriteFileDescriptor(fd, buf, size));
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}
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// Tests that MessagePumpLibevent quits immediately when it is quit from
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// libevent's event_base_loop().
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TEST_F(MessagePumpLibeventTest, QuitWatcher) {
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// Delete the old MessageLoop so that we can manage our own one here.
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ui_loop_.reset();
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MessagePumpLibevent* pump = new MessagePumpLibevent; // owned by |loop|.
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MessageLoop loop(make_scoped_ptr(pump));
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RunLoop run_loop;
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MessagePumpLibevent::FileDescriptorWatcher controller;
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QuitWatcher delegate(&controller, &run_loop);
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WaitableEvent event(false /* manual_reset */, false /* initially_signaled */);
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scoped_ptr<WaitableEventWatcher> watcher(new WaitableEventWatcher);
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// Tell the pump to watch the pipe.
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pump->WatchFileDescriptor(pipefds_[0], false, MessagePumpLibevent::WATCH_READ,
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&controller, &delegate);
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// Make the IO thread wait for |event| before writing to pipefds[1].
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const char buf = 0;
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const WaitableEventWatcher::EventCallback write_fd_task =
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Bind(&WriteFDWrapper, pipefds_[1], &buf, 1);
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io_loop()->PostTask(FROM_HERE,
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Bind(IgnoreResult(&WaitableEventWatcher::StartWatching),
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Unretained(watcher.get()), &event, write_fd_task));
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// Queue |event| to signal on |loop|.
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loop.PostTask(FROM_HERE, Bind(&WaitableEvent::Signal, Unretained(&event)));
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// Now run the MessageLoop.
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run_loop.Run();
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// StartWatching can move |watcher| to IO thread. Release on IO thread.
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io_loop()->PostTask(FROM_HERE, Bind(&WaitableEventWatcher::StopWatching,
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Owned(watcher.release())));
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}
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} // namespace
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} // namespace base
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