Implementation of MessagePump for Mojo.

base/message_loop/message_loop_test.cc

+// Copyright 2013 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.
+
+#include "base/message_loop/message_loop_test.h"
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/run_loop.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+
+namespace base {
+namespace test {
+
+namespace {
+
+class Foo : public RefCounted<Foo> {
+ public:
+  Foo() : test_count_(0) {
+  }
+
+  void Test0() {
+    ++test_count_;
+  }
+
+  void Test1ConstRef(const std::string& a) {
+    ++test_count_;
+    result_.append(a);
+  }
+
+  void Test1Ptr(std::string* a) {
+    ++test_count_;
+    result_.append(*a);
+  }
+
+  void Test1Int(int a) {
+    test_count_ += a;
+  }
+
+  void Test2Ptr(std::string* a, std::string* b) {
+    ++test_count_;
+    result_.append(*a);
+    result_.append(*b);
+  }
+
+  void Test2Mixed(const std::string& a, std::string* b) {
+    ++test_count_;
+    result_.append(a);
+    result_.append(*b);
+  }
+
+  int test_count() const { return test_count_; }
+  const std::string& result() const { return result_; }
+
+ private:
+  friend class RefCounted<Foo>;
+
+  ~Foo() {}
+
+  int test_count_;
+  std::string result_;
+
+  DISALLOW_COPY_AND_ASSIGN(Foo);
+};
+
+// This function runs slowly to simulate a large amount of work being done.
+void SlowFunc(TimeDelta pause, int* quit_counter) {
+    PlatformThread::Sleep(pause);
+    if (--(*quit_counter) == 0)
+      MessageLoop::current()->QuitWhenIdle();
+}
+
+// This function records the time when Run was called in a Time object, which is
+// useful for building a variety of MessageLoop tests.
+// TODO(sky): remove?
+void RecordRunTimeFunc(Time* run_time, int* quit_counter) {
+  *run_time = Time::Now();
+
+    // Cause our Run function to take some time to execute.  As a result we can
+    // count on subsequent RecordRunTimeFunc()s running at a future time,
+    // without worry about the resolution of our system clock being an issue.
+  SlowFunc(TimeDelta::FromMilliseconds(10), quit_counter);
+}
+
+}  // namespace
+
+void RunTest_PostTask(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+  // Add tests to message loop
+  scoped_refptr<Foo> foo(new Foo());
+  std::string a("a"), b("b"), c("c"), d("d");
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test0, foo.get()));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+    &Foo::Test1ConstRef, foo.get(), a));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test1Ptr, foo.get(), &b));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test1Int, foo.get(), 100));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test2Ptr, foo.get(), &a, &c));
+
+  // TryPost with no contention. It must succeed.
+  EXPECT_TRUE(MessageLoop::current()->TryPostTask(FROM_HERE, Bind(
+      &Foo::Test2Mixed, foo.get(), a, &d)));
+
+  // TryPost with simulated contention. It must fail. We wait for a helper
+  // thread to lock the queue, we TryPost on this thread and finally we
+  // signal the helper to unlock and exit.
+  WaitableEvent wait(true, false);
+  WaitableEvent signal(true, false);
+  Thread thread("RunTest_PostTask_helper");
+  thread.Start();
+  thread.message_loop()->PostTask(
+      FROM_HERE,
+      Bind(&MessageLoop::LockWaitUnLockForTesting,
+           base::Unretained(MessageLoop::current()),
+           &wait,
+           &signal));
+
+  wait.Wait();
+  EXPECT_FALSE(MessageLoop::current()->TryPostTask(FROM_HERE, Bind(
+      &Foo::Test2Mixed, foo.get(), a, &d)));
+  signal.Signal();
+
+  // After all tests, post a message that will shut down the message loop
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &MessageLoop::Quit, Unretained(MessageLoop::current())));
+
+  // Now kick things off
+  MessageLoop::current()->Run();
+
+  EXPECT_EQ(foo->test_count(), 105);
+  EXPECT_EQ(foo->result(), "abacad");
+}
+
+void RunTest_PostTask_SEH(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Add tests to message loop
+  scoped_refptr<Foo> foo(new Foo());
+  std::string a("a"), b("b"), c("c"), d("d");
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test0, foo.get()));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test1ConstRef, foo.get(), a));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test1Ptr, foo.get(), &b));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test1Int, foo.get(), 100));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test2Ptr, foo.get(), &a, &c));
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &Foo::Test2Mixed, foo.get(), a, &d));
+
+  // After all tests, post a message that will shut down the message loop
+  MessageLoop::current()->PostTask(FROM_HERE, Bind(
+      &MessageLoop::Quit, Unretained(MessageLoop::current())));
+
+  // Now kick things off with the SEH block active.
+  MessageLoop::current()->set_exception_restoration(true);
+  MessageLoop::current()->Run();
+  MessageLoop::current()->set_exception_restoration(false);
+
+  EXPECT_EQ(foo->test_count(), 105);
+  EXPECT_EQ(foo->result(), "abacad");
+}
+
+void RunTest_PostDelayedTask_Basic(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that PostDelayedTask results in a delayed task.
+
+  const TimeDelta kDelay = TimeDelta::FromMilliseconds(100);
+
+  int num_tasks = 1;
+  Time run_time;
+
+  loop.PostDelayedTask(
+      FROM_HERE, Bind(&RecordRunTimeFunc, &run_time, &num_tasks),
+      kDelay);
+
+  Time time_before_run = Time::Now();
+  loop.Run();
+  Time time_after_run = Time::Now();
+
+  EXPECT_EQ(0, num_tasks);
+  EXPECT_LT(kDelay, time_after_run - time_before_run);
+}
+
+void RunTest_PostDelayedTask_InDelayOrder(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that two tasks with different delays run in the right order.
+  int num_tasks = 2;
+  Time run_time1, run_time2;
+
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time1, &num_tasks),
+      TimeDelta::FromMilliseconds(200));
+  // If we get a large pause in execution (due to a context switch) here, this
+  // test could fail.
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time2, &num_tasks),
+      TimeDelta::FromMilliseconds(10));
+
+  loop.Run();
+  EXPECT_EQ(0, num_tasks);
+
+  EXPECT_TRUE(run_time2 < run_time1);
+}
+
+void RunTest_PostDelayedTask_InPostOrder(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that two tasks with the same delay run in the order in which they
+  // were posted.
+  //
+  // NOTE: This is actually an approximate test since the API only takes a
+  // "delay" parameter, so we are not exactly simulating two tasks that get
+  // posted at the exact same time.  It would be nice if the API allowed us to
+  // specify the desired run time.
+
+  const TimeDelta kDelay = TimeDelta::FromMilliseconds(100);
+
+  int num_tasks = 2;
+  Time run_time1, run_time2;
+
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time1, &num_tasks), kDelay);
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time2, &num_tasks), kDelay);
+
+  loop.Run();
+  EXPECT_EQ(0, num_tasks);
+
+  EXPECT_TRUE(run_time1 < run_time2);
+}
+
+void RunTest_PostDelayedTask_InPostOrder_2(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that a delayed task still runs after a normal tasks even if the
+  // normal tasks take a long time to run.
+
+  const TimeDelta kPause = TimeDelta::FromMilliseconds(50);
+
+  int num_tasks = 2;
+  Time run_time;
+
+  loop.PostTask(FROM_HERE, Bind(&SlowFunc, kPause, &num_tasks));
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time, &num_tasks),
+      TimeDelta::FromMilliseconds(10));
+
+  Time time_before_run = Time::Now();
+  loop.Run();
+  Time time_after_run = Time::Now();
+
+  EXPECT_EQ(0, num_tasks);
+
+  EXPECT_LT(kPause, time_after_run - time_before_run);
+}
+
+void RunTest_PostDelayedTask_InPostOrder_3(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that a delayed task still runs after a pile of normal tasks.  The key
+  // difference between this test and the previous one is that here we return
+  // the MessageLoop a lot so we give the MessageLoop plenty of opportunities
+  // to maybe run the delayed task.  It should know not to do so until the
+  // delayed task's delay has passed.
+
+  int num_tasks = 11;
+  Time run_time1, run_time2;
+
+  // Clutter the ML with tasks.
+  for (int i = 1; i < num_tasks; ++i)
+    loop.PostTask(FROM_HERE,
+                  Bind(&RecordRunTimeFunc, &run_time1, &num_tasks));
+
+  loop.PostDelayedTask(
+      FROM_HERE, Bind(&RecordRunTimeFunc, &run_time2, &num_tasks),
+      TimeDelta::FromMilliseconds(1));
+
+  loop.Run();
+  EXPECT_EQ(0, num_tasks);
+
+  EXPECT_TRUE(run_time2 > run_time1);
+}
+
+void RunTest_PostDelayedTask_SharedTimer(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  // Test that the interval of the timer, used to run the next delayed task, is
+  // set to a value corresponding to when the next delayed task should run.
+
+  // By setting num_tasks to 1, we ensure that the first task to run causes the
+  // run loop to exit.
+  int num_tasks = 1;
+  Time run_time1, run_time2;
+
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time1, &num_tasks),
+      TimeDelta::FromSeconds(1000));
+  loop.PostDelayedTask(
+      FROM_HERE,
+      Bind(&RecordRunTimeFunc, &run_time2, &num_tasks),
+      TimeDelta::FromMilliseconds(10));
+
+  Time start_time = Time::Now();
+
+  loop.Run();
+  EXPECT_EQ(0, num_tasks);
+
+  // Ensure that we ran in far less time than the slower timer.
+  TimeDelta total_time = Time::Now() - start_time;
+  EXPECT_GT(5000, total_time.InMilliseconds());
+
+  // In case both timers somehow run at nearly the same time, sleep a little
+  // and then run all pending to force them both to have run.  This is just
+  // encouraging flakiness if there is any.
+  PlatformThread::Sleep(TimeDelta::FromMilliseconds(100));
+  RunLoop().RunUntilIdle();
+
+  EXPECT_TRUE(run_time1.is_null());
+  EXPECT_FALSE(run_time2.is_null());
+}
+
+// This is used to inject a test point for recording the destructor calls for
+// Closure objects send to MessageLoop::PostTask(). It is awkward usage since we
+// are trying to hook the actual destruction, which is not a common operation.
+class RecordDeletionProbe : public RefCounted<RecordDeletionProbe> {
+ public:
+  RecordDeletionProbe(RecordDeletionProbe* post_on_delete, bool* was_deleted)
+      : post_on_delete_(post_on_delete), was_deleted_(was_deleted) {
+  }
+  void Run() {}
+
+ private:
+  friend class RefCounted<RecordDeletionProbe>;
+
+  ~RecordDeletionProbe() {
+    *was_deleted_ = true;
+    if (post_on_delete_.get())
+      MessageLoop::current()->PostTask(
+          FROM_HERE, Bind(&RecordDeletionProbe::Run, post_on_delete_.get()));
+  }
+
+  scoped_refptr<RecordDeletionProbe> post_on_delete_;
+  bool* was_deleted_;
+};
+
+void RunTest_EnsureDeletion(MessagePumpFactory factory) {
+  bool a_was_deleted = false;
+  bool b_was_deleted = false;
+  {
+    scoped_ptr<MessagePump> pump(factory());
+    MessageLoop loop(pump.Pass());
+    loop.PostTask(
+        FROM_HERE, Bind(&RecordDeletionProbe::Run,
+                              new RecordDeletionProbe(NULL, &a_was_deleted)));
+    // TODO(ajwong): Do we really need 1000ms here?
+    loop.PostDelayedTask(
+        FROM_HERE, Bind(&RecordDeletionProbe::Run,
+                              new RecordDeletionProbe(NULL, &b_was_deleted)),
+        TimeDelta::FromMilliseconds(1000));
+  }
+  EXPECT_TRUE(a_was_deleted);
+  EXPECT_TRUE(b_was_deleted);
+}
+
+void RunTest_EnsureDeletion_Chain(MessagePumpFactory factory) {
+  bool a_was_deleted = false;
+  bool b_was_deleted = false;
+  bool c_was_deleted = false;
+  {
+    scoped_ptr<MessagePump> pump(factory());
+    MessageLoop loop(pump.Pass());
+    // The scoped_refptr for each of the below is held either by the chained
+    // RecordDeletionProbe, or the bound RecordDeletionProbe::Run() callback.
+    RecordDeletionProbe* a = new RecordDeletionProbe(NULL, &a_was_deleted);
+    RecordDeletionProbe* b = new RecordDeletionProbe(a, &b_was_deleted);
+    RecordDeletionProbe* c = new RecordDeletionProbe(b, &c_was_deleted);
+    loop.PostTask(FROM_HERE, Bind(&RecordDeletionProbe::Run, c));
+  }
+  EXPECT_TRUE(a_was_deleted);
+  EXPECT_TRUE(b_was_deleted);
+  EXPECT_TRUE(c_was_deleted);
+}
+
+void NestingFunc(int* depth) {
+  if (*depth > 0) {
+    *depth -= 1;
+    MessageLoop::current()->PostTask(FROM_HERE,
+                                     Bind(&NestingFunc, depth));
+
+    MessageLoop::current()->SetNestableTasksAllowed(true);
+    MessageLoop::current()->Run();
+  }
+  MessageLoop::current()->QuitWhenIdle();
+}
+
+void RunTest_Nesting(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  int depth = 100;
+  MessageLoop::current()->PostTask(FROM_HERE,
+                                   Bind(&NestingFunc, &depth));
+  MessageLoop::current()->Run();
+  EXPECT_EQ(depth, 0);
+}
+
+enum TaskType {
+  MESSAGEBOX,
+  ENDDIALOG,
+  RECURSIVE,
+  TIMEDMESSAGELOOP,
+  QUITMESSAGELOOP,
+  ORDERED,
+  PUMPS,
+  SLEEP,
+  RUNS,
+};
+
+struct TaskItem {
+  TaskItem(TaskType t, int c, bool s)
+      : type(t),
+        cookie(c),
+        start(s) {
+  }
+
+  TaskType type;
+  int cookie;
+  bool start;
+
+  bool operator == (const TaskItem& other) const {
+    return type == other.type && cookie == other.cookie && start == other.start;
+  }
+};
+
+std::ostream& operator <<(std::ostream& os, TaskType type) {
+  switch (type) {
+  case MESSAGEBOX:        os << "MESSAGEBOX"; break;
+  case ENDDIALOG:         os << "ENDDIALOG"; break;
+  case RECURSIVE:         os << "RECURSIVE"; break;
+  case TIMEDMESSAGELOOP:  os << "TIMEDMESSAGELOOP"; break;
+  case QUITMESSAGELOOP:   os << "QUITMESSAGELOOP"; break;
+  case ORDERED:          os << "ORDERED"; break;
+  case PUMPS:             os << "PUMPS"; break;
+  case SLEEP:             os << "SLEEP"; break;
+  default:
+    NOTREACHED();
+    os << "Unknown TaskType";
+    break;
+  }
+  return os;
+}
+
+std::ostream& operator <<(std::ostream& os, const TaskItem& item) {
+  if (item.start)
+    return os << item.type << " " << item.cookie << " starts";
+  else
+    return os << item.type << " " << item.cookie << " ends";
+}
+
+class TaskList {
+ public:
+  void RecordStart(TaskType type, int cookie) {
+    TaskItem item(type, cookie, true);
+    DVLOG(1) << item;
+    task_list_.push_back(item);
+  }
+
+  void RecordEnd(TaskType type, int cookie) {
+    TaskItem item(type, cookie, false);
+    DVLOG(1) << item;
+    task_list_.push_back(item);
+  }
+
+  size_t Size() {
+    return task_list_.size();
+  }
+
+  TaskItem Get(int n)  {
+    return task_list_[n];
+  }
+
+ private:
+  std::vector<TaskItem> task_list_;
+};
+
+void RecursiveFunc(TaskList* order, int cookie, int depth,
+                   bool is_reentrant) {
+  order->RecordStart(RECURSIVE, cookie);
+  if (depth > 0) {
+    if (is_reentrant)
+      MessageLoop::current()->SetNestableTasksAllowed(true);
+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        Bind(&RecursiveFunc, order, cookie, depth - 1, is_reentrant));
+  }
+  order->RecordEnd(RECURSIVE, cookie);
+}
+
+void QuitFunc(TaskList* order, int cookie) {
+  order->RecordStart(QUITMESSAGELOOP, cookie);
+  MessageLoop::current()->QuitWhenIdle();
+  order->RecordEnd(QUITMESSAGELOOP, cookie);
+}
+void RunTest_RecursiveDenial1(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  EXPECT_TRUE(MessageLoop::current()->NestableTasksAllowed());
+  TaskList order;
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      Bind(&RecursiveFunc, &order, 1, 2, false));
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      Bind(&RecursiveFunc, &order, 2, 2, false));
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      Bind(&QuitFunc, &order, 3));
+
+  MessageLoop::current()->Run();
+
+  // FIFO order.
+  ASSERT_EQ(14U, order.Size());
+  EXPECT_EQ(order.Get(0), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(1), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(2), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(3), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(4), TaskItem(QUITMESSAGELOOP, 3, true));
+  EXPECT_EQ(order.Get(5), TaskItem(QUITMESSAGELOOP, 3, false));
+  EXPECT_EQ(order.Get(6), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(7), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(8), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(9), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(10), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(11), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(12), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(13), TaskItem(RECURSIVE, 2, false));
+}
+
+void RecursiveSlowFunc(TaskList* order, int cookie, int depth,
+                       bool is_reentrant) {
+  RecursiveFunc(order, cookie, depth, is_reentrant);
+  PlatformThread::Sleep(TimeDelta::FromMilliseconds(10));
+}
+
+void OrderedFunc(TaskList* order, int cookie) {
+  order->RecordStart(ORDERED, cookie);
+  order->RecordEnd(ORDERED, cookie);
+}
+
+void RunTest_RecursiveDenial3(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  EXPECT_TRUE(MessageLoop::current()->NestableTasksAllowed());
+  TaskList order;
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&RecursiveSlowFunc, &order, 1, 2, false));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&RecursiveSlowFunc, &order, 2, 2, false));
+  MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      Bind(&OrderedFunc, &order, 3),
+      TimeDelta::FromMilliseconds(5));
+  MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      Bind(&QuitFunc, &order, 4),
+      TimeDelta::FromMilliseconds(5));
+
+  MessageLoop::current()->Run();
+
+  // FIFO order.
+  ASSERT_EQ(16U, order.Size());
+  EXPECT_EQ(order.Get(0), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(1), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(2), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(3), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(4), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(5), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(6), TaskItem(ORDERED, 3, true));
+  EXPECT_EQ(order.Get(7), TaskItem(ORDERED, 3, false));
+  EXPECT_EQ(order.Get(8), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(9), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(10), TaskItem(QUITMESSAGELOOP, 4, true));
+  EXPECT_EQ(order.Get(11), TaskItem(QUITMESSAGELOOP, 4, false));
+  EXPECT_EQ(order.Get(12), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(13), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(14), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(15), TaskItem(RECURSIVE, 2, false));
+}
+
+void RunTest_RecursiveSupport1(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&RecursiveFunc, &order, 1, 2, true));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&RecursiveFunc, &order, 2, 2, true));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&QuitFunc, &order, 3));
+
+  MessageLoop::current()->Run();
+
+  // FIFO order.
+  ASSERT_EQ(14U, order.Size());
+  EXPECT_EQ(order.Get(0), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(1), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(2), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(3), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(4), TaskItem(QUITMESSAGELOOP, 3, true));
+  EXPECT_EQ(order.Get(5), TaskItem(QUITMESSAGELOOP, 3, false));
+  EXPECT_EQ(order.Get(6), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(7), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(8), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(9), TaskItem(RECURSIVE, 2, false));
+  EXPECT_EQ(order.Get(10), TaskItem(RECURSIVE, 1, true));
+  EXPECT_EQ(order.Get(11), TaskItem(RECURSIVE, 1, false));
+  EXPECT_EQ(order.Get(12), TaskItem(RECURSIVE, 2, true));
+  EXPECT_EQ(order.Get(13), TaskItem(RECURSIVE, 2, false));
+}
+
+// Tests that non nestable tasks run in FIFO if there are no nested loops.
+void RunTest_NonNestableWithNoNesting(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  MessageLoop::current()->PostNonNestableTask(
+      FROM_HERE,
+      Bind(&OrderedFunc, &order, 1));
+  MessageLoop::current()->PostTask(FROM_HERE,
+                                   Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(FROM_HERE,
+                                   Bind(&QuitFunc, &order, 3));
+  MessageLoop::current()->Run();
+
+  // FIFO order.
+  ASSERT_EQ(6U, order.Size());
+  EXPECT_EQ(order.Get(0), TaskItem(ORDERED, 1, true));
+  EXPECT_EQ(order.Get(1), TaskItem(ORDERED, 1, false));
+  EXPECT_EQ(order.Get(2), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(3), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(4), TaskItem(QUITMESSAGELOOP, 3, true));
+  EXPECT_EQ(order.Get(5), TaskItem(QUITMESSAGELOOP, 3, false));
+}
+
+void FuncThatPumps(TaskList* order, int cookie) {
+  order->RecordStart(PUMPS, cookie);
+  {
+    MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
+    RunLoop().RunUntilIdle();
+  }
+  order->RecordEnd(PUMPS, cookie);
+}
+
+void SleepFunc(TaskList* order, int cookie, TimeDelta delay) {
+  order->RecordStart(SLEEP, cookie);
+  PlatformThread::Sleep(delay);
+  order->RecordEnd(SLEEP, cookie);
+}
+
+// Tests that non nestable tasks don't run when there's code in the call stack.
+void RunTest_NonNestableInNestedLoop(MessagePumpFactory factory,
+                                     bool use_delayed) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      Bind(&FuncThatPumps, &order, 1));
+  if (use_delayed) {
+    MessageLoop::current()->PostNonNestableDelayedTask(
+        FROM_HERE,
+        Bind(&OrderedFunc, &order, 2),
+        TimeDelta::FromMilliseconds(1));
+  } else {
+    MessageLoop::current()->PostNonNestableTask(
+        FROM_HERE,
+        Bind(&OrderedFunc, &order, 2));
+  }
+  MessageLoop::current()->PostTask(FROM_HERE,
+                                   Bind(&OrderedFunc, &order, 3));
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      Bind(&SleepFunc, &order, 4, TimeDelta::FromMilliseconds(50)));
+  MessageLoop::current()->PostTask(FROM_HERE,
+                                   Bind(&OrderedFunc, &order, 5));
+  if (use_delayed) {
+    MessageLoop::current()->PostNonNestableDelayedTask(
+        FROM_HERE,
+        Bind(&QuitFunc, &order, 6),
+        TimeDelta::FromMilliseconds(2));
+  } else {
+    MessageLoop::current()->PostNonNestableTask(
+        FROM_HERE,
+        Bind(&QuitFunc, &order, 6));
+  }
+
+  MessageLoop::current()->Run();
+
+  // FIFO order.
+  ASSERT_EQ(12U, order.Size());
+  EXPECT_EQ(order.Get(0), TaskItem(PUMPS, 1, true));
+  EXPECT_EQ(order.Get(1), TaskItem(ORDERED, 3, true));
+  EXPECT_EQ(order.Get(2), TaskItem(ORDERED, 3, false));
+  EXPECT_EQ(order.Get(3), TaskItem(SLEEP, 4, true));
+  EXPECT_EQ(order.Get(4), TaskItem(SLEEP, 4, false));
+  EXPECT_EQ(order.Get(5), TaskItem(ORDERED, 5, true));
+  EXPECT_EQ(order.Get(6), TaskItem(ORDERED, 5, false));
+  EXPECT_EQ(order.Get(7), TaskItem(PUMPS, 1, false));
+  EXPECT_EQ(order.Get(8), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(9), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(10), TaskItem(QUITMESSAGELOOP, 6, true));
+  EXPECT_EQ(order.Get(11), TaskItem(QUITMESSAGELOOP, 6, false));
+}
+
+void FuncThatRuns(TaskList* order, int cookie, RunLoop* run_loop) {
+  order->RecordStart(RUNS, cookie);
+  {
+    MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
+    run_loop->Run();
+  }
+  order->RecordEnd(RUNS, cookie);
+}
+
+void FuncThatQuitsNow() {
+  MessageLoop::current()->QuitNow();
+}
+// Tests RunLoopQuit only quits the corresponding MessageLoop::Run.
+void RunTest_QuitNow(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop run_loop;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&run_loop)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 3));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 4)); // never runs
+
+  MessageLoop::current()->Run();
+
+  ASSERT_EQ(6U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 3, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 3, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit only quits the corresponding MessageLoop::Run.
+void RunTest_RunLoopQuitTop(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop outer_run_loop;
+  RunLoop nested_run_loop;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&nested_run_loop)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, outer_run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_run_loop.QuitClosure());
+
+  outer_run_loop.Run();
+
+  ASSERT_EQ(4U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit only quits the corresponding MessageLoop::Run.
+void RunTest_RunLoopQuitNested(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop outer_run_loop;
+  RunLoop nested_run_loop;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&nested_run_loop)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, outer_run_loop.QuitClosure());
+
+  outer_run_loop.Run();
+
+  ASSERT_EQ(4U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit only quits the corresponding MessageLoop::Run.
+void RunTest_RunLoopQuitBogus(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop outer_run_loop;
+  RunLoop nested_run_loop;
+  RunLoop bogus_run_loop;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&nested_run_loop)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, bogus_run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, outer_run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_run_loop.QuitClosure());
+
+  outer_run_loop.Run();
+
+  ASSERT_EQ(4U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit only quits the corresponding MessageLoop::Run.
+void RunTest_RunLoopQuitDeep(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop outer_run_loop;
+  RunLoop nested_loop1;
+  RunLoop nested_loop2;
+  RunLoop nested_loop3;
+  RunLoop nested_loop4;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&nested_loop1)));
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 2, Unretained(&nested_loop2)));
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 3, Unretained(&nested_loop3)));
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 4, Unretained(&nested_loop4)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 5));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, outer_run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 6));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_loop1.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 7));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_loop2.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 8));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_loop3.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 9));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, nested_loop4.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 10));
+
+  outer_run_loop.Run();
+
+  ASSERT_EQ(18U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 3, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 4, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 5, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 5, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 6, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 6, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 7, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 7, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 8, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 8, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 9, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 9, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 4, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 3, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 2, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit works before RunWithID.
+void RunTest_RunLoopQuitOrderBefore(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop run_loop;
+
+  run_loop.Quit();
+
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 1)); // never runs
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow)); // never runs
+
+  run_loop.Run();
+
+  ASSERT_EQ(0U, order.Size());
+}
+
+// Tests RunLoopQuit works during RunWithID.
+void RunTest_RunLoopQuitOrderDuring(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop run_loop;
+
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 1));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, run_loop.QuitClosure());
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2)); // never runs
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow)); // never runs
+
+  run_loop.Run();
+
+  ASSERT_EQ(2U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 1, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+// Tests RunLoopQuit works after RunWithID.
+void RunTest_RunLoopQuitOrderAfter(MessagePumpFactory factory) {
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+
+  TaskList order;
+
+  RunLoop run_loop;
+
+  MessageLoop::current()->PostTask(FROM_HERE,
+      Bind(&FuncThatRuns, &order, 1, Unretained(&run_loop)));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 2));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 3));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, run_loop.QuitClosure()); // has no affect
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&OrderedFunc, &order, 4));
+  MessageLoop::current()->PostTask(
+      FROM_HERE, Bind(&FuncThatQuitsNow));
+
+  RunLoop outer_run_loop;
+  outer_run_loop.Run();
+
+  ASSERT_EQ(8U, order.Size());
+  int task_index = 0;
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 2, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(RUNS, 1, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 3, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 3, false));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 4, true));
+  EXPECT_EQ(order.Get(task_index++), TaskItem(ORDERED, 4, false));
+  EXPECT_EQ(static_cast<size_t>(task_index), order.Size());
+}
+
+void PostNTasksThenQuit(int posts_remaining) {
+  if (posts_remaining > 1) {
+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        Bind(&PostNTasksThenQuit, posts_remaining - 1));
+  } else {
+    MessageLoop::current()->QuitWhenIdle();
+  }
+}
+
+// There was a bug in the MessagePumpGLib where posting tasks recursively
+// caused the message loop to hang, due to the buffer of the internal pipe
+// becoming full. Test all MessageLoop types to ensure this issue does not
+// exist in other MessagePumps.
+//
+// On Linux, the pipe buffer size is 64KiB by default. The bug caused one
+// byte accumulated in the pipe per two posts, so we should repeat 128K
+// times to reproduce the bug.
+void RunTest_RecursivePosts(MessagePumpFactory factory) {
+  const int kNumTimes = 1 << 17;
+  scoped_ptr<MessagePump> pump(factory());
+  MessageLoop loop(pump.Pass());
+  loop.PostTask(FROM_HERE, Bind(&PostNTasksThenQuit, kNumTimes));
+  loop.Run();
+}
+
+}  // namespace test
+}  // namespace base