cancelable-tasks-unittest.cc 6.87 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
// Copyright 2015 the V8 project 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 "src/base/atomicops.h"
#include "src/base/platform/platform.h"
#include "src/cancelable-task.h"
#include "testing/gtest/include/gtest/gtest.h"


namespace v8 {
namespace internal {

namespace {

class TestTask : public Task, public Cancelable {
 public:
  enum Mode { kDoNothing, kWaitTillCanceledAgain, kCheckNotRun };

  TestTask(CancelableTaskManager* parent, base::AtomicWord* result,
           Mode mode = kDoNothing)
      : Cancelable(parent), result_(result), mode_(mode) {}

  // Task overrides.
  void Run() final {
    if (TryRun()) {
      RunInternal();
    }
  }

 private:
  void RunInternal() {
    base::Release_Store(result_, id());

    switch (mode_) {
      case kWaitTillCanceledAgain:
        // Simple busy wait until the main thread tried to cancel.
        while (CancelAttempts() == 0) {
        }
        break;
      case kCheckNotRun:
        // Check that we never execute {RunInternal}.
        EXPECT_TRUE(false);
        break;
      default:
        break;
    }
  }

  base::AtomicWord* result_;
  Mode mode_;
};


class SequentialRunner {
 public:
  explicit SequentialRunner(TestTask* task) : task_(task) {}

  void Run() {
    task_->Run();
    delete task_;
  }

 private:
  TestTask* task_;
};


class ThreadedRunner final : public base::Thread {
 public:
  explicit ThreadedRunner(TestTask* task)
      : Thread(Options("runner thread")), task_(task) {}

  virtual void Run() {
    task_->Run();
    delete task_;
  }

 private:
  TestTask* task_;
};


typedef base::AtomicWord ResultType;


intptr_t GetValue(ResultType* result) { return base::Acquire_Load(result); }

}  // namespace


TEST(CancelableTask, EmptyCancelableTaskManager) {
  CancelableTaskManager manager;
  manager.CancelAndWait();
}


TEST(CancelableTask, SequentialCancelAndWait) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  SequentialRunner runner1(
      new TestTask(&manager, &result1, TestTask::kCheckNotRun));
  EXPECT_EQ(GetValue(&result1), 0);
  manager.CancelAndWait();
  EXPECT_EQ(GetValue(&result1), 0);
  runner1.Run();  // Run to avoid leaking the Task.
  EXPECT_EQ(GetValue(&result1), 0);
}


TEST(CancelableTask, SequentialMultipleTasks) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  ResultType result2 = 0;
  TestTask* task1 = new TestTask(&manager, &result1);
  TestTask* task2 = new TestTask(&manager, &result2);
  SequentialRunner runner1(task1);
  SequentialRunner runner2(task2);
119 120
  EXPECT_EQ(task1->id(), 1u);
  EXPECT_EQ(task2->id(), 2u);
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182

  EXPECT_EQ(GetValue(&result1), 0);
  runner1.Run();  // Don't touch task1 after running it.
  EXPECT_EQ(GetValue(&result1), 1);

  EXPECT_EQ(GetValue(&result2), 0);
  runner2.Run();  // Don't touch task2 after running it.
  EXPECT_EQ(GetValue(&result2), 2);

  manager.CancelAndWait();
  EXPECT_FALSE(manager.TryAbort(1));
  EXPECT_FALSE(manager.TryAbort(2));
}


TEST(CancelableTask, ThreadedMultipleTasksStarted) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  ResultType result2 = 0;
  TestTask* task1 =
      new TestTask(&manager, &result1, TestTask::kWaitTillCanceledAgain);
  TestTask* task2 =
      new TestTask(&manager, &result2, TestTask::kWaitTillCanceledAgain);
  ThreadedRunner runner1(task1);
  ThreadedRunner runner2(task2);
  runner1.Start();
  runner2.Start();
  // Busy wait on result to make sure both tasks are done.
  while ((GetValue(&result1) == 0) || (GetValue(&result2) == 0)) {
  }
  manager.CancelAndWait();
  runner1.Join();
  runner2.Join();
  EXPECT_EQ(GetValue(&result1), 1);
  EXPECT_EQ(GetValue(&result2), 2);
}


TEST(CancelableTask, ThreadedMultipleTasksNotRun) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  ResultType result2 = 0;
  TestTask* task1 = new TestTask(&manager, &result1, TestTask::kCheckNotRun);
  TestTask* task2 = new TestTask(&manager, &result2, TestTask::kCheckNotRun);
  ThreadedRunner runner1(task1);
  ThreadedRunner runner2(task2);
  manager.CancelAndWait();
  // Tasks are canceled, hence the runner will bail out and not update result.
  runner1.Start();
  runner2.Start();
  runner1.Join();
  runner2.Join();
  EXPECT_EQ(GetValue(&result1), 0);
  EXPECT_EQ(GetValue(&result2), 0);
}


TEST(CancelableTask, RemoveBeforeCancelAndWait) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  TestTask* task1 = new TestTask(&manager, &result1, TestTask::kCheckNotRun);
  ThreadedRunner runner1(task1);
183
  CancelableTaskManager::Id id = task1->id();
184
  EXPECT_EQ(id, 1u);
185 186 187 188 189 190 191 192 193 194 195 196 197
  EXPECT_TRUE(manager.TryAbort(id));
  runner1.Start();
  runner1.Join();
  manager.CancelAndWait();
  EXPECT_EQ(GetValue(&result1), 0);
}


TEST(CancelableTask, RemoveAfterCancelAndWait) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  TestTask* task1 = new TestTask(&manager, &result1);
  ThreadedRunner runner1(task1);
198
  CancelableTaskManager::Id id = task1->id();
199
  EXPECT_EQ(id, 1u);
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
  runner1.Start();
  runner1.Join();
  manager.CancelAndWait();
  EXPECT_FALSE(manager.TryAbort(id));
  EXPECT_EQ(GetValue(&result1), 1);
}


TEST(CancelableTask, RemoveUnmanagedId) {
  CancelableTaskManager manager;
  EXPECT_FALSE(manager.TryAbort(1));
  EXPECT_FALSE(manager.TryAbort(2));
  manager.CancelAndWait();
  EXPECT_FALSE(manager.TryAbort(1));
  EXPECT_FALSE(manager.TryAbort(3));
}

217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261
TEST(CancelableTask, EmptyTryAbortAll) {
  CancelableTaskManager manager;
  EXPECT_EQ(manager.TryAbortAll(), CancelableTaskManager::kTaskRemoved);
}

TEST(CancelableTask, ThreadedMultipleTasksNotRunTryAbortAll) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  ResultType result2 = 0;
  TestTask* task1 = new TestTask(&manager, &result1, TestTask::kCheckNotRun);
  TestTask* task2 = new TestTask(&manager, &result2, TestTask::kCheckNotRun);
  ThreadedRunner runner1(task1);
  ThreadedRunner runner2(task2);
  EXPECT_EQ(manager.TryAbortAll(), CancelableTaskManager::kTaskAborted);
  // Tasks are canceled, hence the runner will bail out and not update result.
  runner1.Start();
  runner2.Start();
  runner1.Join();
  runner2.Join();
  EXPECT_EQ(GetValue(&result1), 0);
  EXPECT_EQ(GetValue(&result2), 0);
}

TEST(CancelableTask, ThreadedMultipleTasksStartedTryAbortAll) {
  CancelableTaskManager manager;
  ResultType result1 = 0;
  ResultType result2 = 0;
  TestTask* task1 =
      new TestTask(&manager, &result1, TestTask::kWaitTillCanceledAgain);
  TestTask* task2 =
      new TestTask(&manager, &result2, TestTask::kWaitTillCanceledAgain);
  ThreadedRunner runner1(task1);
  ThreadedRunner runner2(task2);
  runner1.Start();
  // Busy wait on result to make sure task1 is done.
  while (GetValue(&result1) == 0) {
  }
  EXPECT_EQ(manager.TryAbortAll(), CancelableTaskManager::kTaskRunning);
  runner2.Start();
  runner1.Join();
  runner2.Join();
  EXPECT_EQ(GetValue(&result1), 1);
  EXPECT_EQ(GetValue(&result2), 0);
}

262 263
}  // namespace internal
}  // namespace v8