Revert "Track thread activities in order to diagnose hangs."

base/debug/activity_analyzer_unittest.cc

-// Copyright 2016 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/debug/activity_analyzer.h"
-
-#include <memory>
-
-#include "base/bind.h"
-#include "base/debug/activity_tracker.h"
-#include "base/files/file.h"
-#include "base/files/file_util.h"
-#include "base/files/memory_mapped_file.h"
-#include "base/files/scoped_temp_dir.h"
-#include "base/memory/ptr_util.h"
-#include "base/pending_task.h"
-#include "base/process/process.h"
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-#include "base/synchronization/spin_wait.h"
-#include "base/threading/platform_thread.h"
-#include "base/threading/simple_thread.h"
-#include "base/time/time.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace base {
-namespace debug {
-
-namespace {
-
-class TestActivityTracker : public ThreadActivityTracker {
- public:
-  TestActivityTracker(std::unique_ptr<char[]> memory, size_t mem_size)
-      : ThreadActivityTracker(memset(memory.get(), 0, mem_size), mem_size),
-        mem_segment_(std::move(memory)) {}
-
-  ~TestActivityTracker() override {}
-
- private:
-  std::unique_ptr<char[]> mem_segment_;
-};
-
-}  // namespace
-
-
-class ActivityAnalyzerTest : public testing::Test {
- public:
-  const int kMemorySize = 1 << 10;  // 1MiB
-  const int kStackSize  = 1 << 10;  // 1KiB
-
-  using Activity = ThreadActivityAnalyzer::Activity;
-
-  ActivityAnalyzerTest() {}
-
-  ~ActivityAnalyzerTest() override {
-    GlobalActivityTracker* global_tracker = GlobalActivityTracker::Get();
-    if (global_tracker) {
-      global_tracker->ReleaseTrackerForCurrentThreadForTesting();
-      delete global_tracker;
-    }
-  }
-
-  std::unique_ptr<ThreadActivityTracker> CreateActivityTracker() {
-    std::unique_ptr<char[]> memory(new char[kStackSize]);
-    return WrapUnique(new TestActivityTracker(std::move(memory), kStackSize));
-  }
-
-  static void DoNothing() {}
-};
-
-TEST_F(ActivityAnalyzerTest, ThreadAnalyzerConstruction) {
-  std::unique_ptr<ThreadActivityTracker> tracker = CreateActivityTracker();
-  {
-    ThreadActivityAnalyzer analyzer(*tracker);
-    EXPECT_TRUE(analyzer.IsValid());
-    EXPECT_EQ(PlatformThread::GetName(), analyzer.GetThreadName());
-  }
-
-  // TODO(bcwhite): More tests once Analyzer does more.
-}
-
-
-// GlobalActivityAnalyzer tests below.
-
-class SimpleActivityThread : public SimpleThread {
- public:
-  SimpleActivityThread(const std::string& name,
-                       const void* source,
-                       ThreadActivityTracker::ActivityType activity,
-                       const ThreadActivityTracker::ActivityData& data)
-      : SimpleThread(name, Options()),
-        source_(source),
-        activity_(activity),
-        data_(data),
-        exit_condition_(&lock_) {}
-
-  ~SimpleActivityThread() override {}
-
-  void Run() override {
-    GlobalActivityTracker::Get()
-        ->GetOrCreateTrackerForCurrentThread()
-        ->PushActivity(source_, activity_, data_);
-
-    {
-      AutoLock auto_lock(lock_);
-      ready_ = true;
-      while (!exit_)
-        exit_condition_.Wait();
-    }
-
-    GlobalActivityTracker::Get()
-        ->GetOrCreateTrackerForCurrentThread()
-        ->PopActivity();
-  }
-
-  void Exit() {
-    AutoLock auto_lock(lock_);
-    exit_ = true;
-    exit_condition_.Signal();
-  }
-
-  void WaitReady() {
-    SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(ready_);
-  }
-
- private:
-  const void* source_;
-  ThreadActivityTracker::ActivityType activity_;
-  ThreadActivityTracker::ActivityData data_;
-
-  bool ready_ = false;
-  bool exit_ = false;
-  Lock lock_;
-  ConditionVariable exit_condition_;
-
-  DISALLOW_COPY_AND_ASSIGN(SimpleActivityThread);
-};
-
-TEST_F(ActivityAnalyzerTest, GlobalAnalyzerConstruction) {
-  GlobalActivityTracker::CreateWithLocalMemory(kMemorySize, 0, "", 3);
-
-  PersistentMemoryAllocator* allocator =
-      GlobalActivityTracker::Get()->allocator();
-  GlobalActivityAnalyzer analyzer(WrapUnique(
-      new PersistentMemoryAllocator(const_cast<void*>(allocator->data()),
-                                    allocator->size(), 0, 0, "", true)));
-
-  // The only thread at thois point is the test thread.
-  ThreadActivityAnalyzer* ta1 = analyzer.GetFirstAnalyzer();
-  ASSERT_TRUE(ta1);
-  EXPECT_FALSE(analyzer.GetNextAnalyzer());
-  ThreadActivityAnalyzer::ThreadKey tk1 = ta1->GetThreadKey();
-  EXPECT_EQ(ta1, analyzer.GetAnalyzerForThread(tk1));
-
-  // Create a second thread that will do something.
-  SimpleActivityThread t2("t2", nullptr, ThreadActivityTracker::ACT_TASK,
-                          ThreadActivityTracker::ActivityData::ForTask(11));
-  t2.Start();
-  t2.WaitReady();
-
-  // Now there should be two.
-  EXPECT_TRUE(analyzer.GetFirstAnalyzer());
-  EXPECT_TRUE(analyzer.GetNextAnalyzer());
-  EXPECT_FALSE(analyzer.GetNextAnalyzer());
-
-  // Let thread exit.
-  t2.Exit();
-  t2.Join();
-
-  // Now there should be only one again. Calling GetFirstAnalyzer invalidates
-  // any previously returned analyzer pointers.
-  ThreadActivityAnalyzer* ta2 = analyzer.GetFirstAnalyzer();
-  ASSERT_TRUE(ta2);
-  EXPECT_FALSE(analyzer.GetNextAnalyzer());
-  ThreadActivityAnalyzer::ThreadKey tk2 = ta2->GetThreadKey();
-  EXPECT_EQ(ta2, analyzer.GetAnalyzerForThread(tk2));
-  EXPECT_EQ(tk1, tk2);
-}
-
-}  // namespace debug
-}  // namespace base