base/sequenced_task_runner_unittest.cc

   1 // Copyright 2016 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sequenced_task_runner.h"
   6
   7 #include <utility>
   8
   9 #include "base/bind.h"
  10 #include "base/gtest_prod_util.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/run_loop.h"
  13 #include "base/threading/thread.h"
  14 #include "testing/gtest/include/gtest/gtest.h"
  15
  16 namespace base {
  17 namespace {
  18
  19 class FlagOnDelete {
  20  public:
  21   FlagOnDelete(bool* deleted,
  22                scoped_refptr<SequencedTaskRunner> expected_deletion_sequence)
  23       : deleted_(deleted),
  24         expected_deletion_sequence_(std::move(expected_deletion_sequence)) {}
  25
  26  private:
  27   friend class DeleteHelper<FlagOnDelete>;
  28   FRIEND_TEST_ALL_PREFIXES(SequencedTaskRunnerTest,
  29                            OnTaskRunnerDeleterTargetStoppedEarly);
  30
  31   ~FlagOnDelete() {
  32     EXPECT_FALSE(*deleted_);
  33     *deleted_ = true;
  34     if (expected_deletion_sequence_)
  35       EXPECT_TRUE(expected_deletion_sequence_->RunsTasksInCurrentSequence());
  36   }
  37
  38   bool* deleted_;
  39   const scoped_refptr<SequencedTaskRunner> expected_deletion_sequence_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(FlagOnDelete);
  42 };
  43
  44 class SequencedTaskRunnerTest : public testing::Test {
  45  protected:
  46   SequencedTaskRunnerTest() : foreign_thread_("foreign") {}
  47
  48   void SetUp() override {
  49     main_runner_ = message_loop_.task_runner();
  50
  51     foreign_thread_.Start();
  52     foreign_runner_ = foreign_thread_.task_runner();
  53   }
  54
  55   scoped_refptr<SequencedTaskRunner> main_runner_;
  56   scoped_refptr<SequencedTaskRunner> foreign_runner_;
  57
  58   Thread foreign_thread_;
  59
  60  private:
  61   MessageLoop message_loop_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(SequencedTaskRunnerTest);
  64 };
  65
  66 using SequenceBoundUniquePtr =
  67     std::unique_ptr<FlagOnDelete, OnTaskRunnerDeleter>;
  68
  69 TEST_F(SequencedTaskRunnerTest, OnTaskRunnerDeleterOnMainThread) {
  70   bool deleted_on_main_thread = false;
  71   SequenceBoundUniquePtr ptr(
  72       new FlagOnDelete(&deleted_on_main_thread, main_runner_),
  73       OnTaskRunnerDeleter(main_runner_));
  74   EXPECT_FALSE(deleted_on_main_thread);
  75   foreign_runner_->PostTask(
  76       FROM_HERE, BindOnce([](SequenceBoundUniquePtr) {}, std::move(ptr)));
  77
  78   {
  79     RunLoop run_loop;
  80     foreign_runner_->PostTaskAndReply(FROM_HERE, BindOnce([] {}),
  81                                       run_loop.QuitClosure());
  82     run_loop.Run();
  83   }
  84   EXPECT_TRUE(deleted_on_main_thread);
  85 }
  86
  87 TEST_F(SequencedTaskRunnerTest, OnTaskRunnerDeleterTargetStoppedEarly) {
  88   bool deleted_on_main_thread = false;
  89   FlagOnDelete* raw = new FlagOnDelete(&deleted_on_main_thread, main_runner_);
  90   SequenceBoundUniquePtr ptr(raw, OnTaskRunnerDeleter(foreign_runner_));
  91   EXPECT_FALSE(deleted_on_main_thread);
  92
  93   // Stopping the target ahead of deleting |ptr| should make its
  94   // OnTaskRunnerDeleter no-op.
  95   foreign_thread_.Stop();
  96   ptr = nullptr;
  97   EXPECT_FALSE(deleted_on_main_thread);
  98
  99   delete raw;
 100   EXPECT_TRUE(deleted_on_main_thread);
 101 }
 102
 103 }  // namespace
 104 }  // namespace base