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| 1 // Copyright (c) 2017 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/pending_task.h" |
| 6 |
| 7 #include <vector> |
| 8 |
| 9 #include "base/bind.h" |
| 10 #include "base/message_loop/message_loop.h" |
| 11 #include "base/run_loop.h" |
| 12 #include "base/strings/stringprintf.h" |
| 13 #include "base/threading/thread.h" |
| 14 #include "testing/gtest/include/gtest/gtest.h" |
| 15 |
| 16 namespace base { |
| 17 |
| 18 class PendingTaskTest : public ::testing::Test { |
| 19 public: |
| 20 PendingTaskTest() = default; |
| 21 |
| 22 ~PendingTaskTest() override = default; |
| 23 |
| 24 protected: |
| 25 using ExpectedTrace = std::vector<const void*>; |
| 26 |
| 27 static void VerifyTraceAndPost( |
| 28 const scoped_refptr<TaskRunner>& task_runner, |
| 29 const tracked_objects::Location& posted_from, |
| 30 const tracked_objects::Location& next_from_here, |
| 31 const std::vector<const void*>& expected_trace, |
| 32 Closure task) { |
| 33 SCOPED_TRACE(StringPrintf("Callback Depth: %zu", expected_trace.size())); |
| 34 |
| 35 // Beyond depth + 1, the trace is nonsensical because there haven't been |
| 36 // enough nested tasks called. |
| 37 const PendingTask* current_pending_task = |
| 38 MessageLoop::current()->current_pending_task_; |
| 39 size_t window = std::min(current_pending_task->task_backtrace.size(), |
| 40 expected_trace.size()); |
| 41 |
| 42 EXPECT_EQ(posted_from, |
| 43 MessageLoop::current()->current_pending_task_->posted_from); |
| 44 for (size_t i = 0; i < window; i++) { |
| 45 SCOPED_TRACE(StringPrintf("Trace frame: %zu", i)); |
| 46 EXPECT_EQ(expected_trace[i], current_pending_task->task_backtrace[i]); |
| 47 } |
| 48 task_runner->PostTask(next_from_here, std::move(task)); |
| 49 } |
| 50 |
| 51 static void RunTwo(Closure c1, Closure c2) { |
| 52 c1.Run(); |
| 53 c2.Run(); |
| 54 } |
| 55 }; |
| 56 |
| 57 // Ensure the task backtrace populates correctly. |
| 58 TEST_F(PendingTaskTest, SingleThreadedSimple) { |
| 59 MessageLoop loop; |
| 60 const tracked_objects::Location& location0 = FROM_HERE; |
| 61 const tracked_objects::Location& location1 = FROM_HERE; |
| 62 const tracked_objects::Location& location2 = FROM_HERE; |
| 63 const tracked_objects::Location& location3 = FROM_HERE; |
| 64 const tracked_objects::Location& location4 = FROM_HERE; |
| 65 const tracked_objects::Location& location5 = FROM_HERE; |
| 66 |
| 67 Closure task5 = Bind( |
| 68 &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location4, |
| 69 location5, |
| 70 ExpectedTrace({location3.program_counter(), location2.program_counter(), |
| 71 location1.program_counter(), location0.program_counter()}), |
| 72 Bind(&DoNothing)); |
| 73 Closure task4 = Bind( |
| 74 &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location3, |
| 75 location4, |
| 76 ExpectedTrace({location2.program_counter(), location1.program_counter(), |
| 77 location0.program_counter(), nullptr}), |
| 78 task5); |
| 79 Closure task3 = Bind( |
| 80 &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location2, |
| 81 location3, ExpectedTrace({location1.program_counter(), |
| 82 location0.program_counter(), nullptr, nullptr}), |
| 83 task4); |
| 84 Closure task2 = |
| 85 Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location1, |
| 86 location2, ExpectedTrace({location0.program_counter()}), task3); |
| 87 Closure task1 = Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
| 88 location0, location1, ExpectedTrace({}), task2); |
| 89 |
| 90 loop.task_runner()->PostTask(location0, task1); |
| 91 |
| 92 RunLoop().RunUntilIdle(); |
| 93 } |
| 94 |
| 95 // Post a task onto another thread. Ensure on the other thread, it has the |
| 96 // right stack trace. |
| 97 TEST_F(PendingTaskTest, MultipleThreads) { |
| 98 MessageLoop loop; // Implicitly "thread a." |
| 99 Thread thread_b("pt_test_b"); |
| 100 Thread thread_c("pt_test_c"); |
| 101 thread_b.StartAndWaitForTesting(); |
| 102 thread_c.StartAndWaitForTesting(); |
| 103 |
| 104 const tracked_objects::Location& location_a0 = FROM_HERE; |
| 105 const tracked_objects::Location& location_a1 = FROM_HERE; |
| 106 const tracked_objects::Location& location_a2 = FROM_HERE; |
| 107 const tracked_objects::Location& location_a3 = FROM_HERE; |
| 108 |
| 109 const tracked_objects::Location& location_b0 = FROM_HERE; |
| 110 const tracked_objects::Location& location_b1 = FROM_HERE; |
| 111 |
| 112 const tracked_objects::Location& location_c0 = FROM_HERE; |
| 113 |
| 114 // On thread c, post a task back to thread a that verifies its trace |
| 115 // and terminates after one more self-post. |
| 116 Closure task_a2 = |
| 117 Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
| 118 location_a2, location_a3, |
| 119 ExpectedTrace( |
| 120 {location_c0.program_counter(), location_b0.program_counter(), |
| 121 location_a1.program_counter(), location_a0.program_counter()}), |
| 122 Bind(&DoNothing)); |
| 123 Closure task_c0 = Bind(&PendingTaskTest::VerifyTraceAndPost, |
| 124 loop.task_runner(), location_c0, location_a2, |
| 125 ExpectedTrace({location_b0.program_counter(), |
| 126 location_a1.program_counter(), |
| 127 location_a0.program_counter()}), |
| 128 task_a2); |
| 129 |
| 130 // On thread b run two tasks that conceptually come from the same location |
| 131 // (managed via RunTwo().) One will post back to thread b and another will |
| 132 // post to thread c to test spawning multiple tasks on different message |
| 133 // loops. The task posted to thread c will not get location b1 whereas the |
| 134 // one posted back to thread b will. |
| 135 Closure task_b0_fork = |
| 136 Bind(&PendingTaskTest::VerifyTraceAndPost, |
| 137 thread_c.message_loop()->task_runner(), location_b0, location_c0, |
| 138 ExpectedTrace({location_a1.program_counter(), |
| 139 location_a0.program_counter(), nullptr}), |
| 140 task_c0); |
| 141 Closure task_b0_local = |
| 142 Bind(&PendingTaskTest::VerifyTraceAndPost, |
| 143 thread_b.message_loop()->task_runner(), location_b0, location_b1, |
| 144 ExpectedTrace({location_a1.program_counter(), |
| 145 location_a0.program_counter(), nullptr}), |
| 146 Bind(&DoNothing)); |
| 147 |
| 148 // Push one frame onto the stack in thread a then pass to thread b. |
| 149 Closure task_a1 = |
| 150 Bind(&PendingTaskTest::VerifyTraceAndPost, |
| 151 thread_b.message_loop()->task_runner(), location_a1, location_b0, |
| 152 ExpectedTrace({location_a0.program_counter(), nullptr}), |
| 153 Bind(&PendingTaskTest::RunTwo, task_b0_local, task_b0_fork)); |
| 154 Closure task_a0 = |
| 155 Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
| 156 location_a0, location_a1, ExpectedTrace({nullptr}), task_a1); |
| 157 |
| 158 loop.task_runner()->PostTask(location_a0, task_a0); |
| 159 |
| 160 RunLoop().RunUntilIdle(); |
| 161 |
| 162 thread_b.FlushForTesting(); |
| 163 thread_b.Stop(); |
| 164 |
| 165 thread_c.FlushForTesting(); |
| 166 thread_c.Stop(); |
| 167 } |
| 168 |
| 169 } // namespace base |
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