fischman@chromium.org | 998561e | 2012-01-24 07:56:41 +0900 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 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/at_exit.h" |
| 6 | #include "base/atomic_sequence_num.h" |
| 7 | #include "base/lazy_instance.h" |
jbates@chromium.org | dde8e30 | 2012-02-24 02:52:20 +0900 | [diff] [blame] | 8 | #include "base/memory/aligned_memory.h" |
brettw@chromium.org | 34f964f | 2010-12-31 03:08:36 +0900 | [diff] [blame] | 9 | #include "base/threading/simple_thread.h" |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 10 | #include "testing/gtest/include/gtest/gtest.h" |
| 11 | |
| 12 | namespace { |
| 13 | |
pliard@chromium.org | ac1f41d | 2012-03-13 21:07:19 +0900 | [diff] [blame] | 14 | base::StaticAtomicSequenceNumber constructed_seq_; |
| 15 | base::StaticAtomicSequenceNumber destructed_seq_; |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 16 | |
| 17 | class ConstructAndDestructLogger { |
| 18 | public: |
| 19 | ConstructAndDestructLogger() { |
| 20 | constructed_seq_.GetNext(); |
| 21 | } |
| 22 | ~ConstructAndDestructLogger() { |
| 23 | destructed_seq_.GetNext(); |
| 24 | } |
| 25 | }; |
| 26 | |
| 27 | class SlowConstructor { |
| 28 | public: |
| 29 | SlowConstructor() : some_int_(0) { |
brettw@chromium.org | 6139182 | 2011-01-01 05:02:16 +0900 | [diff] [blame] | 30 | // Sleep for 1 second to try to cause a race. |
tedvessenes@gmail.com | aaa6303 | 2012-01-01 07:53:51 +0900 | [diff] [blame] | 31 | base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(1)); |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 32 | ++constructed; |
| 33 | some_int_ = 12; |
| 34 | } |
| 35 | int some_int() const { return some_int_; } |
| 36 | |
| 37 | static int constructed; |
| 38 | private: |
| 39 | int some_int_; |
| 40 | }; |
| 41 | |
| 42 | int SlowConstructor::constructed = 0; |
| 43 | |
| 44 | class SlowDelegate : public base::DelegateSimpleThread::Delegate { |
| 45 | public: |
erg@google.com | bf6ce9f | 2010-01-27 08:08:02 +0900 | [diff] [blame] | 46 | explicit SlowDelegate(base::LazyInstance<SlowConstructor>* lazy) |
| 47 | : lazy_(lazy) {} |
| 48 | |
rsleevi@chromium.org | de3a6cf | 2012-04-06 12:53:02 +0900 | [diff] [blame] | 49 | virtual void Run() OVERRIDE { |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 50 | EXPECT_EQ(12, lazy_->Get().some_int()); |
| 51 | EXPECT_EQ(12, lazy_->Pointer()->some_int()); |
| 52 | } |
| 53 | |
| 54 | private: |
| 55 | base::LazyInstance<SlowConstructor>* lazy_; |
| 56 | }; |
| 57 | |
| 58 | } // namespace |
| 59 | |
joth@chromium.org | b24883c | 2011-11-15 22:31:49 +0900 | [diff] [blame] | 60 | static base::LazyInstance<ConstructAndDestructLogger> lazy_logger = |
| 61 | LAZY_INSTANCE_INITIALIZER; |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 62 | |
| 63 | TEST(LazyInstanceTest, Basic) { |
| 64 | { |
phajdan.jr@chromium.org | e7f133a | 2009-11-19 18:11:39 +0900 | [diff] [blame] | 65 | base::ShadowingAtExitManager shadow; |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 66 | |
| 67 | EXPECT_EQ(0, constructed_seq_.GetNext()); |
| 68 | EXPECT_EQ(0, destructed_seq_.GetNext()); |
| 69 | |
| 70 | lazy_logger.Get(); |
| 71 | EXPECT_EQ(2, constructed_seq_.GetNext()); |
| 72 | EXPECT_EQ(1, destructed_seq_.GetNext()); |
| 73 | |
| 74 | lazy_logger.Pointer(); |
| 75 | EXPECT_EQ(3, constructed_seq_.GetNext()); |
| 76 | EXPECT_EQ(2, destructed_seq_.GetNext()); |
maruel@chromium.org | 8fe7adc | 2009-03-04 00:01:12 +0900 | [diff] [blame] | 77 | } |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 78 | EXPECT_EQ(4, constructed_seq_.GetNext()); |
| 79 | EXPECT_EQ(4, destructed_seq_.GetNext()); |
| 80 | } |
| 81 | |
joth@chromium.org | b24883c | 2011-11-15 22:31:49 +0900 | [diff] [blame] | 82 | static base::LazyInstance<SlowConstructor> lazy_slow = |
| 83 | LAZY_INSTANCE_INITIALIZER; |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 84 | |
| 85 | TEST(LazyInstanceTest, ConstructorThreadSafety) { |
| 86 | { |
phajdan.jr@chromium.org | e7f133a | 2009-11-19 18:11:39 +0900 | [diff] [blame] | 87 | base::ShadowingAtExitManager shadow; |
deanm@google.com | a6deb00 | 2008-09-08 23:11:13 +0900 | [diff] [blame] | 88 | |
| 89 | SlowDelegate delegate(&lazy_slow); |
| 90 | EXPECT_EQ(0, SlowConstructor::constructed); |
| 91 | |
| 92 | base::DelegateSimpleThreadPool pool("lazy_instance_cons", 5); |
| 93 | pool.AddWork(&delegate, 20); |
| 94 | EXPECT_EQ(0, SlowConstructor::constructed); |
| 95 | |
| 96 | pool.Start(); |
| 97 | pool.JoinAll(); |
| 98 | EXPECT_EQ(1, SlowConstructor::constructed); |
| 99 | } |
| 100 | } |
evan@chromium.org | a04f70c | 2010-10-22 05:41:47 +0900 | [diff] [blame] | 101 | |
| 102 | namespace { |
| 103 | |
| 104 | // DeleteLogger is an object which sets a flag when it's destroyed. |
| 105 | // It accepts a bool* and sets the bool to true when the dtor runs. |
| 106 | class DeleteLogger { |
| 107 | public: |
| 108 | DeleteLogger() : deleted_(NULL) {} |
| 109 | ~DeleteLogger() { *deleted_ = true; } |
| 110 | |
| 111 | void SetDeletedPtr(bool* deleted) { |
| 112 | deleted_ = deleted; |
| 113 | } |
| 114 | |
| 115 | private: |
| 116 | bool* deleted_; |
| 117 | }; |
| 118 | |
| 119 | } // anonymous namespace |
| 120 | |
| 121 | TEST(LazyInstanceTest, LeakyLazyInstance) { |
| 122 | // Check that using a plain LazyInstance causes the dtor to run |
| 123 | // when the AtExitManager finishes. |
| 124 | bool deleted1 = false; |
| 125 | { |
| 126 | base::ShadowingAtExitManager shadow; |
joth@chromium.org | b24883c | 2011-11-15 22:31:49 +0900 | [diff] [blame] | 127 | static base::LazyInstance<DeleteLogger> test = LAZY_INSTANCE_INITIALIZER; |
evan@chromium.org | a04f70c | 2010-10-22 05:41:47 +0900 | [diff] [blame] | 128 | test.Get().SetDeletedPtr(&deleted1); |
| 129 | } |
| 130 | EXPECT_TRUE(deleted1); |
| 131 | |
| 132 | // Check that using a *leaky* LazyInstance makes the dtor not run |
| 133 | // when the AtExitManager finishes. |
| 134 | bool deleted2 = false; |
| 135 | { |
| 136 | base::ShadowingAtExitManager shadow; |
fischman@chromium.org | 998561e | 2012-01-24 07:56:41 +0900 | [diff] [blame] | 137 | static base::LazyInstance<DeleteLogger>::Leaky |
joth@chromium.org | b24883c | 2011-11-15 22:31:49 +0900 | [diff] [blame] | 138 | test = LAZY_INSTANCE_INITIALIZER; |
evan@chromium.org | a04f70c | 2010-10-22 05:41:47 +0900 | [diff] [blame] | 139 | test.Get().SetDeletedPtr(&deleted2); |
| 140 | } |
| 141 | EXPECT_FALSE(deleted2); |
| 142 | } |
jbates@chromium.org | dde8e30 | 2012-02-24 02:52:20 +0900 | [diff] [blame] | 143 | |
| 144 | namespace { |
| 145 | |
| 146 | template <size_t alignment> |
| 147 | class AlignedData { |
| 148 | public: |
| 149 | AlignedData() {} |
| 150 | ~AlignedData() {} |
| 151 | base::AlignedMemory<alignment, alignment> data_; |
| 152 | }; |
| 153 | |
| 154 | } // anonymous namespace |
| 155 | |
| 156 | #define EXPECT_ALIGNED(ptr, align) \ |
| 157 | EXPECT_EQ(0u, reinterpret_cast<uintptr_t>(ptr) & (align - 1)) |
| 158 | |
| 159 | TEST(LazyInstanceTest, Alignment) { |
| 160 | using base::LazyInstance; |
| 161 | |
| 162 | // Create some static instances with increasing sizes and alignment |
| 163 | // requirements. By ordering this way, the linker will need to do some work to |
| 164 | // ensure proper alignment of the static data. |
| 165 | static LazyInstance<AlignedData<4> > align4 = LAZY_INSTANCE_INITIALIZER; |
| 166 | static LazyInstance<AlignedData<32> > align32 = LAZY_INSTANCE_INITIALIZER; |
| 167 | static LazyInstance<AlignedData<4096> > align4096 = LAZY_INSTANCE_INITIALIZER; |
| 168 | |
| 169 | EXPECT_ALIGNED(align4.Pointer(), 4); |
| 170 | EXPECT_ALIGNED(align32.Pointer(), 32); |
| 171 | EXPECT_ALIGNED(align4096.Pointer(), 4096); |
| 172 | } |