Separates ipc code from common (http://crbug.com/16829)

ipc/ipc_sync_channel_unittest.cc

+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Unit test for SyncChannel.
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "base/platform_thread.h"
+#include "base/stl_util-inl.h"
+#include "base/string_util.h"
+#include "base/thread.h"
+#include "base/waitable_event.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_sync_channel.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+
+#define MESSAGES_INTERNAL_FILE "ipc/ipc_sync_message_unittest.h"
+#include "ipc/ipc_message_macros.h"
+
+using namespace IPC;
+using base::WaitableEvent;
+
+namespace {
+
+// Base class for a "process" with listener and IPC threads.
+class Worker : public Channel::Listener, public Message::Sender {
+ public:
+  // Will create a channel without a name.
+  Worker(Channel::Mode mode, const std::string& thread_name)
+      : done_(new WaitableEvent(false, false)),
+        channel_created_(new WaitableEvent(false, false)),
+        mode_(mode),
+        ipc_thread_((thread_name + "_ipc").c_str()),
+        listener_thread_((thread_name + "_listener").c_str()),
+        overrided_thread_(NULL),
+        shutdown_event_(true, false) { }
+
+  // Will create a named channel and use this name for the threads' name.
+  Worker(const std::string& channel_name, Channel::Mode mode)
+      : done_(new WaitableEvent(false, false)),
+        channel_created_(new WaitableEvent(false, false)),
+        channel_name_(channel_name),
+        mode_(mode),
+        ipc_thread_((channel_name + "_ipc").c_str()),
+        listener_thread_((channel_name + "_listener").c_str()),
+        overrided_thread_(NULL),
+        shutdown_event_(true, false) { }
+
+  // The IPC thread needs to outlive SyncChannel, so force the correct order of
+  // destruction.
+  virtual ~Worker() {
+    WaitableEvent listener_done(false, false), ipc_done(false, false);
+    ListenerThread()->message_loop()->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &Worker::OnListenerThreadShutdown1, &listener_done,
+        &ipc_done));
+    listener_done.Wait();
+    ipc_done.Wait();
+    ipc_thread_.Stop();
+    listener_thread_.Stop();
+  }
+  void AddRef() { }
+  void Release() { }
+  bool Send(Message* msg) { return channel_->Send(msg); }
+  bool SendWithTimeout(Message* msg, int timeout_ms) {
+    return channel_->SendWithTimeout(msg, timeout_ms);
+  }
+  void WaitForChannelCreation() { channel_created_->Wait(); }
+  void CloseChannel() {
+    DCHECK(MessageLoop::current() == ListenerThread()->message_loop());
+    channel_->Close();
+  }
+  void Start() {
+    StartThread(&listener_thread_, MessageLoop::TYPE_DEFAULT);
+    ListenerThread()->message_loop()->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &Worker::OnStart));
+  }
+  void OverrideThread(base::Thread* overrided_thread) {
+    DCHECK(overrided_thread_ == NULL);
+    overrided_thread_ = overrided_thread;
+  }
+  bool SendAnswerToLife(bool pump, int timeout, bool succeed) {
+    int answer = 0;
+    SyncMessage* msg = new SyncChannelTestMsg_AnswerToLife(&answer);
+    if (pump)
+      msg->EnableMessagePumping();
+    bool result = SendWithTimeout(msg, timeout);
+    DCHECK(result == succeed);
+    DCHECK(answer == (succeed ? 42 : 0));
+    return result;
+  }
+  bool SendDouble(bool pump, bool succeed) {
+    int answer = 0;
+    SyncMessage* msg = new SyncChannelTestMsg_Double(5, &answer);
+    if (pump)
+      msg->EnableMessagePumping();
+    bool result = Send(msg);
+    DCHECK(result == succeed);
+    DCHECK(answer == (succeed ? 10 : 0));
+    return result;
+  }
+  Channel::Mode mode() { return mode_; }
+  WaitableEvent* done_event() { return done_.get(); }
+
+ protected:
+  // Derived classes need to call this when they've completed their part of
+  // the test.
+  void Done() { done_->Signal(); }
+  // Functions for dervied classes to implement if they wish.
+  virtual void Run() { }
+  virtual void OnAnswer(int* answer) { NOTREACHED(); }
+  virtual void OnAnswerDelay(Message* reply_msg) {
+    // The message handler map below can only take one entry for
+    // SyncChannelTestMsg_AnswerToLife, so since some classes want
+    // the normal version while other want the delayed reply, we
+    // call the normal version if the derived class didn't override
+    // this function.
+    int answer;
+    OnAnswer(&answer);
+    SyncChannelTestMsg_AnswerToLife::WriteReplyParams(reply_msg, answer);
+    Send(reply_msg);
+  }
+  virtual void OnDouble(int in, int* out) { NOTREACHED(); }
+  virtual void OnDoubleDelay(int in, Message* reply_msg) {
+    int result;
+    OnDouble(in, &result);
+    SyncChannelTestMsg_Double::WriteReplyParams(reply_msg, result);
+    Send(reply_msg);
+  }
+
+ private:
+  base::Thread* ListenerThread() {
+    return overrided_thread_ ? overrided_thread_ : &listener_thread_;
+  }
+  // Called on the listener thread to create the sync channel.
+  void OnStart() {
+    // Link ipc_thread_, listener_thread_ and channel_ altogether.
+    StartThread(&ipc_thread_, MessageLoop::TYPE_IO);
+    channel_.reset(new SyncChannel(
+        channel_name_, mode_, this, NULL, ipc_thread_.message_loop(), true,
+        &shutdown_event_));
+    channel_created_->Signal();
+    Run();
+  }
+
+  void OnListenerThreadShutdown1(WaitableEvent* listener_event,
+                                 WaitableEvent* ipc_event) {
+    // SyncChannel needs to be destructed on the thread that it was created on.
+    channel_.reset();
+
+    MessageLoop::current()->RunAllPending();
+
+    ipc_thread_.message_loop()->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &Worker::OnIPCThreadShutdown, listener_event, ipc_event));
+  }
+
+  void OnIPCThreadShutdown(WaitableEvent* listener_event,
+                           WaitableEvent* ipc_event) {
+    MessageLoop::current()->RunAllPending();
+    ipc_event->Signal();
+
+    listener_thread_.message_loop()->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &Worker::OnListenerThreadShutdown2, listener_event));
+  }
+
+  void OnListenerThreadShutdown2(WaitableEvent* listener_event) {
+    MessageLoop::current()->RunAllPending();
+    listener_event->Signal();
+  }
+
+  void OnMessageReceived(const Message& message) {
+    IPC_BEGIN_MESSAGE_MAP(Worker, message)
+     IPC_MESSAGE_HANDLER_DELAY_REPLY(SyncChannelTestMsg_Double, OnDoubleDelay)
+     IPC_MESSAGE_HANDLER_DELAY_REPLY(SyncChannelTestMsg_AnswerToLife,
+                                     OnAnswerDelay)
+    IPC_END_MESSAGE_MAP()
+  }
+
+  void StartThread(base::Thread* thread, MessageLoop::Type type) {
+    base::Thread::Options options;
+    options.message_loop_type = type;
+    thread->StartWithOptions(options);
+  }
+
+  scoped_ptr<WaitableEvent> done_;
+  scoped_ptr<WaitableEvent> channel_created_;
+  std::string channel_name_;
+  Channel::Mode mode_;
+  scoped_ptr<SyncChannel> channel_;
+  base::Thread ipc_thread_;
+  base::Thread listener_thread_;
+  base::Thread* overrided_thread_;
+
+  base::WaitableEvent shutdown_event_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(Worker);
+};
+
+
+// Starts the test with the given workers.  This function deletes the workers
+// when it's done.
+void RunTest(std::vector<Worker*> workers) {
+  // First we create the workers that are channel servers, or else the other
+  // workers' channel initialization might fail because the pipe isn't created..
+  for (size_t i = 0; i < workers.size(); ++i) {
+    if (workers[i]->mode() == Channel::MODE_SERVER) {
+      workers[i]->Start();
+      workers[i]->WaitForChannelCreation();
+    }
+  }
+
+  // now create the clients
+  for (size_t i = 0; i < workers.size(); ++i) {
+    if (workers[i]->mode() == Channel::MODE_CLIENT)
+      workers[i]->Start();
+  }
+
+  // wait for all the workers to finish
+  for (size_t i = 0; i < workers.size(); ++i)
+    workers[i]->done_event()->Wait();
+
+  STLDeleteContainerPointers(workers.begin(), workers.end());
+}
+
+}  // namespace
+
+class IPCSyncChannelTest : public testing::Test {
+ private:
+  MessageLoop message_loop_;
+};
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class SimpleServer : public Worker {
+ public:
+  SimpleServer(bool pump_during_send)
+      : Worker(Channel::MODE_SERVER, "simpler_server"),
+        pump_during_send_(pump_during_send) { }
+  void Run() {
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, true);
+    Done();
+  }
+
+  bool pump_during_send_;
+};
+
+class SimpleClient : public Worker {
+ public:
+  SimpleClient() : Worker(Channel::MODE_CLIENT, "simple_client") { }
+
+  void OnAnswer(int* answer) {
+    *answer = 42;
+    Done();
+  }
+};
+
+void Simple(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  workers.push_back(new SimpleServer(pump_during_send));
+  workers.push_back(new SimpleClient());
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests basic synchronous call
+TEST_F(IPCSyncChannelTest, Simple) {
+  Simple(false);
+  Simple(true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class DelayClient : public Worker {
+ public:
+  DelayClient() : Worker(Channel::MODE_CLIENT, "delay_client") { }
+
+  void OnAnswerDelay(Message* reply_msg) {
+    SyncChannelTestMsg_AnswerToLife::WriteReplyParams(reply_msg, 42);
+    Send(reply_msg);
+    Done();
+  }
+};
+
+void DelayReply(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  workers.push_back(new SimpleServer(pump_during_send));
+  workers.push_back(new DelayClient());
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that asynchronous replies work
+TEST_F(IPCSyncChannelTest, DelayReply) {
+  DelayReply(false);
+  DelayReply(true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class NoHangServer : public Worker {
+ public:
+  explicit NoHangServer(WaitableEvent* got_first_reply, bool pump_during_send)
+      : Worker(Channel::MODE_SERVER, "no_hang_server"),
+        got_first_reply_(got_first_reply),
+        pump_during_send_(pump_during_send) { }
+  void Run() {
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, true);
+    got_first_reply_->Signal();
+
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, false);
+    Done();
+  }
+
+  WaitableEvent* got_first_reply_;
+  bool pump_during_send_;
+};
+
+class NoHangClient : public Worker {
+ public:
+  explicit NoHangClient(WaitableEvent* got_first_reply)
+    : Worker(Channel::MODE_CLIENT, "no_hang_client"),
+      got_first_reply_(got_first_reply) { }
+
+  virtual void OnAnswerDelay(Message* reply_msg) {
+    // Use the DELAY_REPLY macro so that we can force the reply to be sent
+    // before this function returns (when the channel will be reset).
+    SyncChannelTestMsg_AnswerToLife::WriteReplyParams(reply_msg, 42);
+    Send(reply_msg);
+    got_first_reply_->Wait();
+    CloseChannel();
+    Done();
+  }
+
+  WaitableEvent* got_first_reply_;
+};
+
+void NoHang(bool pump_during_send) {
+  WaitableEvent got_first_reply(false, false);
+  std::vector<Worker*> workers;
+  workers.push_back(new NoHangServer(&got_first_reply, pump_during_send));
+  workers.push_back(new NoHangClient(&got_first_reply));
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that caller doesn't hang if receiver dies
+TEST_F(IPCSyncChannelTest, NoHang) {
+  NoHang(false);
+  NoHang(true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class UnblockServer : public Worker {
+ public:
+  UnblockServer(bool pump_during_send)
+    : Worker(Channel::MODE_SERVER, "unblock_server"),
+      pump_during_send_(pump_during_send) { }
+  void Run() {
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, true);
+    Done();
+  }
+
+  void OnDouble(int in, int* out) {
+    *out = in * 2;
+  }
+
+  bool pump_during_send_;
+};
+
+class UnblockClient : public Worker {
+ public:
+  UnblockClient(bool pump_during_send)
+    : Worker(Channel::MODE_CLIENT, "unblock_client"),
+      pump_during_send_(pump_during_send) { }
+
+  void OnAnswer(int* answer) {
+    SendDouble(pump_during_send_, true);
+    *answer = 42;
+    Done();
+  }
+
+  bool pump_during_send_;
+};
+
+void Unblock(bool server_pump, bool client_pump) {
+  std::vector<Worker*> workers;
+  workers.push_back(new UnblockServer(server_pump));
+  workers.push_back(new UnblockClient(client_pump));
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that the caller unblocks to answer a sync message from the receiver.
+TEST_F(IPCSyncChannelTest, Unblock) {
+  Unblock(false, false);
+  Unblock(false, true);
+  Unblock(true, false);
+  Unblock(true, true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class RecursiveServer : public Worker {
+ public:
+  explicit RecursiveServer(
+    bool expected_send_result, bool pump_first, bool pump_second)
+    : Worker(Channel::MODE_SERVER, "recursive_server"),
+      expected_send_result_(expected_send_result),
+      pump_first_(pump_first), pump_second_(pump_second)  { }
+  void Run() {
+    SendDouble(pump_first_, expected_send_result_);
+    Done();
+  }
+
+  void OnDouble(int in, int* out) {
+    *out = in * 2;
+    SendAnswerToLife(pump_second_, base::kNoTimeout, expected_send_result_);
+  }
+
+  bool expected_send_result_, pump_first_, pump_second_;
+};
+
+class RecursiveClient : public Worker {
+ public:
+  explicit RecursiveClient(bool pump_during_send, bool close_channel)
+    : Worker(Channel::MODE_CLIENT, "recursive_client"),
+      pump_during_send_(pump_during_send), close_channel_(close_channel) { }
+
+  void OnDoubleDelay(int in, Message* reply_msg) {
+    SendDouble(pump_during_send_, !close_channel_);
+    if (close_channel_) {
+      delete reply_msg;
+    } else {
+      SyncChannelTestMsg_Double::WriteReplyParams(reply_msg, in * 2);
+      Send(reply_msg);
+    }
+    Done();
+  }
+
+  void OnAnswerDelay(Message* reply_msg) {
+    if (close_channel_) {
+      delete reply_msg;
+      CloseChannel();
+    } else {
+      SyncChannelTestMsg_AnswerToLife::WriteReplyParams(reply_msg, 42);
+      Send(reply_msg);
+    }
+  }
+
+  bool pump_during_send_, close_channel_;
+};
+
+void Recursive(
+    bool server_pump_first, bool server_pump_second, bool client_pump) {
+  std::vector<Worker*> workers;
+  workers.push_back(
+      new RecursiveServer(true, server_pump_first, server_pump_second));
+  workers.push_back(new RecursiveClient(client_pump, false));
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests a server calling Send while another Send is pending.
+TEST_F(IPCSyncChannelTest, Recursive) {
+  Recursive(false, false, false);
+  Recursive(false, false, true);
+  Recursive(false, true, false);
+  Recursive(false, true, true);
+  Recursive(true, false, false);
+  Recursive(true, false, true);
+  Recursive(true, true, false);
+  Recursive(true, true, true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+void RecursiveNoHang(
+    bool server_pump_first, bool server_pump_second, bool client_pump) {
+  std::vector<Worker*> workers;
+  workers.push_back(
+      new RecursiveServer(false, server_pump_first, server_pump_second));
+  workers.push_back(new RecursiveClient(client_pump, true));
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that if a caller makes a sync call during an existing sync call and
+// the receiver dies, neither of the Send() calls hang.
+TEST_F(IPCSyncChannelTest, RecursiveNoHang) {
+  RecursiveNoHang(false, false, false);
+  RecursiveNoHang(false, false, true);
+  RecursiveNoHang(false, true, false);
+  RecursiveNoHang(false, true, true);
+  RecursiveNoHang(true, false, false);
+  RecursiveNoHang(true, false, true);
+  RecursiveNoHang(true, true, false);
+  RecursiveNoHang(true, true, true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class MultipleServer1 : public Worker {
+ public:
+  MultipleServer1(bool pump_during_send)
+    : Worker("test_channel1", Channel::MODE_SERVER),
+      pump_during_send_(pump_during_send) { }
+
+  void Run() {
+    SendDouble(pump_during_send_, true);
+    Done();
+  }
+
+  bool pump_during_send_;
+};
+
+class MultipleClient1 : public Worker {
+ public:
+  MultipleClient1(WaitableEvent* client1_msg_received,
+                  WaitableEvent* client1_can_reply) :
+      Worker("test_channel1", Channel::MODE_CLIENT),
+      client1_msg_received_(client1_msg_received),
+      client1_can_reply_(client1_can_reply) { }
+
+  void OnDouble(int in, int* out) {
+    client1_msg_received_->Signal();
+    *out = in * 2;
+    client1_can_reply_->Wait();
+    Done();
+  }
+
+ private:
+  WaitableEvent *client1_msg_received_, *client1_can_reply_;
+};
+
+class MultipleServer2 : public Worker {
+ public:
+  MultipleServer2() : Worker("test_channel2", Channel::MODE_SERVER) { }
+
+  void OnAnswer(int* result) {
+    *result = 42;
+    Done();
+  }
+};
+
+class MultipleClient2 : public Worker {
+ public:
+  MultipleClient2(
+    WaitableEvent* client1_msg_received, WaitableEvent* client1_can_reply,
+    bool pump_during_send)
+    : Worker("test_channel2", Channel::MODE_CLIENT),
+      client1_msg_received_(client1_msg_received),
+      client1_can_reply_(client1_can_reply),
+      pump_during_send_(pump_during_send) { }
+
+  void Run() {
+    client1_msg_received_->Wait();
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, true);
+    client1_can_reply_->Signal();
+    Done();
+  }
+
+ private:
+  WaitableEvent *client1_msg_received_, *client1_can_reply_;
+  bool pump_during_send_;
+};
+
+void Multiple(bool server_pump, bool client_pump) {
+  std::vector<Worker*> workers;
+
+  // A shared worker thread so that server1 and server2 run on one thread.
+  base::Thread worker_thread("Multiple");
+  ASSERT_TRUE(worker_thread.Start());
+
+  // Server1 sends a sync msg to client1, which blocks the reply until
+  // server2 (which runs on the same worker thread as server1) responds
+  // to a sync msg from client2.
+  WaitableEvent client1_msg_received(false, false);
+  WaitableEvent client1_can_reply(false, false);
+
+  Worker* worker;
+
+  worker = new MultipleServer2();
+  worker->OverrideThread(&worker_thread);
+  workers.push_back(worker);
+
+  worker = new MultipleClient2(
+      &client1_msg_received, &client1_can_reply, client_pump);
+  workers.push_back(worker);
+
+  worker = new MultipleServer1(server_pump);
+  worker->OverrideThread(&worker_thread);
+  workers.push_back(worker);
+
+  worker = new MultipleClient1(
+      &client1_msg_received, &client1_can_reply);
+  workers.push_back(worker);
+
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that multiple SyncObjects on the same listener thread can unblock each
+// other.
+TEST_F(IPCSyncChannelTest, Multiple) {
+  Multiple(false, false);
+  Multiple(false, true);
+  Multiple(true, false);
+  Multiple(true, true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class QueuedReplyServer1 : public Worker {
+ public:
+  QueuedReplyServer1(bool pump_during_send)
+    : Worker("test_channel1", Channel::MODE_SERVER),
+      pump_during_send_(pump_during_send) { }
+  void Run() {
+    SendDouble(pump_during_send_, true);
+    Done();
+  }
+
+  bool pump_during_send_;
+};
+
+class QueuedReplyClient1 : public Worker {
+ public:
+  QueuedReplyClient1(WaitableEvent* client1_msg_received,
+                     WaitableEvent* server2_can_reply) :
+      Worker("test_channel1", Channel::MODE_CLIENT),
+      client1_msg_received_(client1_msg_received),
+      server2_can_reply_(server2_can_reply) { }
+
+  void OnDouble(int in, int* out) {
+    client1_msg_received_->Signal();
+    *out = in * 2;
+    server2_can_reply_->Wait();
+    Done();
+  }
+
+ private:
+  WaitableEvent *client1_msg_received_, *server2_can_reply_;
+};
+
+class QueuedReplyServer2 : public Worker {
+ public:
+  explicit QueuedReplyServer2(WaitableEvent* server2_can_reply) :
+      Worker("test_channel2", Channel::MODE_SERVER),
+      server2_can_reply_(server2_can_reply) { }
+
+  void OnAnswer(int* result) {
+    server2_can_reply_->Signal();
+
+    // give client1's reply time to reach the server listener thread
+    PlatformThread::Sleep(200);
+
+    *result = 42;
+    Done();
+  }
+
+  WaitableEvent *server2_can_reply_;
+};
+
+class QueuedReplyClient2 : public Worker {
+ public:
+  explicit QueuedReplyClient2(
+    WaitableEvent* client1_msg_received, bool pump_during_send)
+    : Worker("test_channel2", Channel::MODE_CLIENT),
+      client1_msg_received_(client1_msg_received),
+      pump_during_send_(pump_during_send){ }
+
+  void Run() {
+    client1_msg_received_->Wait();
+    SendAnswerToLife(pump_during_send_, base::kNoTimeout, true);
+    Done();
+  }
+
+  WaitableEvent *client1_msg_received_;
+  bool pump_during_send_;
+};
+
+void QueuedReply(bool server_pump, bool client_pump) {
+  std::vector<Worker*> workers;
+
+  // A shared worker thread so that server1 and server2 run on one thread.
+  base::Thread worker_thread("QueuedReply");
+  ASSERT_TRUE(worker_thread.Start());
+
+  WaitableEvent client1_msg_received(false, false);
+  WaitableEvent server2_can_reply(false, false);
+
+  Worker* worker;
+
+  worker = new QueuedReplyServer2(&server2_can_reply);
+  worker->OverrideThread(&worker_thread);
+  workers.push_back(worker);
+
+  worker = new QueuedReplyClient2(&client1_msg_received, client_pump);
+  workers.push_back(worker);
+
+  worker = new QueuedReplyServer1(server_pump);
+  worker->OverrideThread(&worker_thread);
+  workers.push_back(worker);
+
+  worker = new QueuedReplyClient1(
+      &client1_msg_received, &server2_can_reply);
+  workers.push_back(worker);
+
+  RunTest(workers);
+}
+
+}  // namespace
+
+// While a blocking send is in progress, the listener thread might answer other
+// synchronous messages.  This tests that if during the response to another
+// message the reply to the original messages comes, it is queued up correctly
+// and the original Send is unblocked later.
+TEST_F(IPCSyncChannelTest, QueuedReply) {
+  QueuedReply(false, false);
+  QueuedReply(false, true);
+  QueuedReply(true, false);
+  QueuedReply(true, true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class BadServer : public Worker {
+ public:
+  BadServer(bool pump_during_send)
+    : Worker(Channel::MODE_SERVER, "simpler_server"),
+      pump_during_send_(pump_during_send) { }
+  void Run() {
+    int answer = 0;
+
+    SyncMessage* msg = new SyncMessage(
+        MSG_ROUTING_CONTROL, SyncChannelTestMsg_Double::ID,
+        Message::PRIORITY_NORMAL, NULL);
+    if (pump_during_send_)
+      msg->EnableMessagePumping();
+
+    // Temporarily set the minimum logging very high so that the assertion
+    // in ipc_message_utils doesn't fire.
+    int log_level = logging::GetMinLogLevel();
+    logging::SetMinLogLevel(kint32max);
+    bool result = Send(msg);
+    logging::SetMinLogLevel(log_level);
+    DCHECK(!result);
+
+    // Need to send another message to get the client to call Done().
+    result = Send(new SyncChannelTestMsg_AnswerToLife(&answer));
+    DCHECK(result);
+    DCHECK(answer == 42);
+
+    Done();
+  }
+
+  bool pump_during_send_;
+};
+
+void BadMessage(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  workers.push_back(new BadServer(pump_during_send));
+  workers.push_back(new SimpleClient());
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that if a message is not serialized correctly, the Send() will fail.
+TEST_F(IPCSyncChannelTest, BadMessage) {
+  BadMessage(false);
+  BadMessage(true);
+}
+
+//-----------------------------------------------------------------------------
+
+namespace {
+
+class ChattyClient : public Worker {
+ public:
+  ChattyClient() :
+      Worker(Channel::MODE_CLIENT, "chatty_client") { }
+
+  void OnAnswer(int* answer) {
+    // The PostMessage limit is 10k.  Send 20% more than that.
+    const int kMessageLimit = 10000;
+    const int kMessagesToSend = kMessageLimit * 120 / 100;
+    for (int i = 0; i < kMessagesToSend; ++i) {
+      if (!SendDouble(false, true))
+        break;
+    }
+    *answer = 42;
+    Done();
+  }
+};
+
+void ChattyServer(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  workers.push_back(new UnblockServer(pump_during_send));
+  workers.push_back(new ChattyClient());
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests http://b/1093251 - that sending lots of sync messages while
+// the receiver is waiting for a sync reply does not overflow the PostMessage
+// queue.
+TEST_F(IPCSyncChannelTest, ChattyServer) {
+  ChattyServer(false);
+  ChattyServer(true);
+}
+
+//------------------------------------------------------------------------------
+
+namespace {
+
+class TimeoutServer : public Worker {
+ public:
+   TimeoutServer(int timeout_ms,
+                 std::vector<bool> timeout_seq,
+                 bool pump_during_send)
+      : Worker(Channel::MODE_SERVER, "timeout_server"),
+        timeout_ms_(timeout_ms),
+        timeout_seq_(timeout_seq),
+        pump_during_send_(pump_during_send) {
+  }
+
+  void Run() {
+    for (std::vector<bool>::const_iterator iter = timeout_seq_.begin();
+         iter != timeout_seq_.end(); ++iter) {
+      SendAnswerToLife(pump_during_send_, timeout_ms_, !*iter);
+    }
+    Done();
+  }
+
+ private:
+  int timeout_ms_;
+  std::vector<bool> timeout_seq_;
+  bool pump_during_send_;
+};
+
+class UnresponsiveClient : public Worker {
+ public:
+   UnresponsiveClient(std::vector<bool> timeout_seq)
+      : Worker(Channel::MODE_CLIENT, "unresponsive_client"),
+        timeout_seq_(timeout_seq) {
+   }
+
+  void OnAnswerDelay(Message* reply_msg) {
+    DCHECK(!timeout_seq_.empty());
+    if (!timeout_seq_[0]) {
+      SyncChannelTestMsg_AnswerToLife::WriteReplyParams(reply_msg, 42);
+      Send(reply_msg);
+    } else {
+      // Don't reply.
+      delete reply_msg;
+    }
+    timeout_seq_.erase(timeout_seq_.begin());
+    if (timeout_seq_.empty())
+      Done();
+  }
+
+ private:
+  // Whether we should time-out or respond to the various messages we receive.
+  std::vector<bool> timeout_seq_;
+};
+
+void SendWithTimeoutOK(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  std::vector<bool> timeout_seq;
+  timeout_seq.push_back(false);
+  timeout_seq.push_back(false);
+  timeout_seq.push_back(false);
+  workers.push_back(new TimeoutServer(5000, timeout_seq, pump_during_send));
+  workers.push_back(new SimpleClient());
+  RunTest(workers);
+}
+
+void SendWithTimeoutTimeout(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  std::vector<bool> timeout_seq;
+  timeout_seq.push_back(true);
+  timeout_seq.push_back(false);
+  timeout_seq.push_back(false);
+  workers.push_back(new TimeoutServer(100, timeout_seq, pump_during_send));
+  workers.push_back(new UnresponsiveClient(timeout_seq));
+  RunTest(workers);
+}
+
+void SendWithTimeoutMixedOKAndTimeout(bool pump_during_send) {
+  std::vector<Worker*> workers;
+  std::vector<bool> timeout_seq;
+  timeout_seq.push_back(true);
+  timeout_seq.push_back(false);
+  timeout_seq.push_back(false);
+  timeout_seq.push_back(true);
+  timeout_seq.push_back(false);
+  workers.push_back(new TimeoutServer(100, timeout_seq, pump_during_send));
+  workers.push_back(new UnresponsiveClient(timeout_seq));
+  RunTest(workers);
+}
+
+}  // namespace
+
+// Tests that SendWithTimeout does not time-out if the response comes back fast
+// enough.
+TEST_F(IPCSyncChannelTest, SendWithTimeoutOK) {
+  SendWithTimeoutOK(false);
+  SendWithTimeoutOK(true);
+}
+
+// Tests that SendWithTimeout does time-out.
+TEST_F(IPCSyncChannelTest, SendWithTimeoutTimeout) {
+  SendWithTimeoutTimeout(false);
+  SendWithTimeoutTimeout(true);
+}
+
+// Sends some message that time-out and some that succeed.
+TEST_F(IPCSyncChannelTest, SendWithTimeoutMixedOKAndTimeout) {
+  SendWithTimeoutMixedOKAndTimeout(false);
+  SendWithTimeoutMixedOKAndTimeout(true);
+}
+
+//------------------------------------------------------------------------------
+
+namespace {
+
+class NestedTask : public Task {
+ public:
+  NestedTask(Worker* server) : server_(server) { }
+  void Run() {
+    // Sleep a bit so that we wake up after the reply has been received.
+    PlatformThread::Sleep(250);
+    server_->SendAnswerToLife(true, base::kNoTimeout, true);
+  }
+
+  Worker* server_;
+};
+
+static bool timeout_occured = false;
+
+class TimeoutTask : public Task {
+ public:
+  void Run() {
+    timeout_occured = true;
+  }
+};
+
+class DoneEventRaceServer : public Worker {
+ public:
+  DoneEventRaceServer()
+      : Worker(Channel::MODE_SERVER, "done_event_race_server") { }
+
+  void Run() {
+    MessageLoop::current()->PostTask(FROM_HERE, new NestedTask(this));
+    MessageLoop::current()->PostDelayedTask(FROM_HERE, new TimeoutTask(), 9000);
+    // Even though we have a timeout on the Send, it will succeed since for this
+    // bug, the reply message comes back and is deserialized, however the done
+    // event wasn't set.  So we indirectly use the timeout task to notice if a
+    // timeout occurred.
+    SendAnswerToLife(true, 10000, true);
+    DCHECK(!timeout_occured);
+    Done();
+  }
+};
+
+}  // namespace
+
+// Tests http://b/1474092 - that if after the done_event is set but before
+// OnObjectSignaled is called another message is sent out, then after its
+// reply comes back OnObjectSignaled will be called for the first message.
+TEST_F(IPCSyncChannelTest, DoneEventRace) {
+  std::vector<Worker*> workers;
+  workers.push_back(new DoneEventRaceServer());
+  workers.push_back(new SimpleClient());
+  RunTest(workers);
+}