Index: base/pending_task_unittest.cc |
diff --git a/base/pending_task_unittest.cc b/base/pending_task_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8d52daa949d44ace0d6f187e893209591363b40c |
--- /dev/null |
+++ b/base/pending_task_unittest.cc |
@@ -0,0 +1,169 @@ |
+// Copyright (c) 2017 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/pending_task.h" |
+ |
+#include <vector> |
+ |
+#include "base/bind.h" |
+#include "base/message_loop/message_loop.h" |
+#include "base/run_loop.h" |
+#include "base/strings/stringprintf.h" |
+#include "base/threading/thread.h" |
+#include "testing/gtest/include/gtest/gtest.h" |
+ |
+namespace base { |
+ |
+class PendingTaskTest : public ::testing::Test { |
+ public: |
+ PendingTaskTest() = default; |
+ |
+ ~PendingTaskTest() override = default; |
+ |
+ protected: |
+ using ExpectedTrace = std::vector<const void*>; |
+ |
+ static void VerifyTraceAndPost( |
+ const scoped_refptr<TaskRunner>& task_runner, |
+ const tracked_objects::Location& posted_from, |
+ const tracked_objects::Location& next_from_here, |
+ const std::vector<const void*>& expected_trace, |
+ Closure task) { |
+ SCOPED_TRACE(StringPrintf("Callback Depth: %zu", expected_trace.size())); |
+ |
+ // Beyond depth + 1, the trace is nonsensical because there haven't been |
+ // enough nested tasks called. |
+ const PendingTask* current_pending_task = |
+ MessageLoop::current()->current_pending_task_; |
+ size_t window = std::min(current_pending_task->task_backtrace.size(), |
+ expected_trace.size()); |
+ |
+ EXPECT_EQ(posted_from, |
+ MessageLoop::current()->current_pending_task_->posted_from); |
+ for (size_t i = 0; i < window; i++) { |
+ SCOPED_TRACE(StringPrintf("Trace frame: %zu", i)); |
+ EXPECT_EQ(expected_trace[i], current_pending_task->task_backtrace[i]); |
+ } |
+ task_runner->PostTask(next_from_here, std::move(task)); |
+ } |
+ |
+ static void RunTwo(Closure c1, Closure c2) { |
+ c1.Run(); |
+ c2.Run(); |
+ } |
+}; |
+ |
+// Ensure the task backtrace populates correctly. |
+TEST_F(PendingTaskTest, SingleThreadedSimple) { |
+ MessageLoop loop; |
+ const tracked_objects::Location& location0 = FROM_HERE; |
+ const tracked_objects::Location& location1 = FROM_HERE; |
+ const tracked_objects::Location& location2 = FROM_HERE; |
+ const tracked_objects::Location& location3 = FROM_HERE; |
+ const tracked_objects::Location& location4 = FROM_HERE; |
+ const tracked_objects::Location& location5 = FROM_HERE; |
+ |
+ Closure task5 = Bind( |
+ &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location4, |
+ location5, |
+ ExpectedTrace({location3.program_counter(), location2.program_counter(), |
+ location1.program_counter(), location0.program_counter()}), |
+ Bind(&DoNothing)); |
+ Closure task4 = Bind( |
+ &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location3, |
+ location4, |
+ ExpectedTrace({location2.program_counter(), location1.program_counter(), |
+ location0.program_counter(), nullptr}), |
+ task5); |
+ Closure task3 = Bind( |
+ &PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location2, |
+ location3, ExpectedTrace({location1.program_counter(), |
+ location0.program_counter(), nullptr, nullptr}), |
+ task4); |
+ Closure task2 = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), location1, |
+ location2, ExpectedTrace({location0.program_counter()}), task3); |
+ Closure task1 = Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
+ location0, location1, ExpectedTrace({}), task2); |
+ |
+ loop.task_runner()->PostTask(location0, task1); |
+ |
+ RunLoop().RunUntilIdle(); |
+} |
+ |
+// Post a task onto another thread. Ensure on the other thread, it has the |
+// right stack trace. |
+TEST_F(PendingTaskTest, MultipleThreads) { |
+ MessageLoop loop; // Implicitly "thread a." |
+ Thread thread_b("pt_test_b"); |
+ Thread thread_c("pt_test_c"); |
+ thread_b.StartAndWaitForTesting(); |
+ thread_c.StartAndWaitForTesting(); |
+ |
+ const tracked_objects::Location& location_a0 = FROM_HERE; |
+ const tracked_objects::Location& location_a1 = FROM_HERE; |
+ const tracked_objects::Location& location_a2 = FROM_HERE; |
+ const tracked_objects::Location& location_a3 = FROM_HERE; |
+ |
+ const tracked_objects::Location& location_b0 = FROM_HERE; |
+ const tracked_objects::Location& location_b1 = FROM_HERE; |
+ |
+ const tracked_objects::Location& location_c0 = FROM_HERE; |
+ |
+ // On thread c, post a task back to thread a that verifies its trace |
+ // and terminates after one more self-post. |
+ Closure task_a2 = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
+ location_a2, location_a3, |
+ ExpectedTrace( |
+ {location_c0.program_counter(), location_b0.program_counter(), |
+ location_a1.program_counter(), location_a0.program_counter()}), |
+ Bind(&DoNothing)); |
+ Closure task_c0 = Bind(&PendingTaskTest::VerifyTraceAndPost, |
+ loop.task_runner(), location_c0, location_a2, |
+ ExpectedTrace({location_b0.program_counter(), |
+ location_a1.program_counter(), |
+ location_a0.program_counter()}), |
+ task_a2); |
+ |
+ // On thread b run two tasks that conceptually come from the same location |
+ // (managed via RunTwo().) One will post back to thread b and another will |
+ // post to thread c to test spawning multiple tasks on different message |
+ // loops. The task posted to thread c will not get location b1 whereas the |
+ // one posted back to thread b will. |
+ Closure task_b0_fork = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, |
+ thread_c.message_loop()->task_runner(), location_b0, location_c0, |
+ ExpectedTrace({location_a1.program_counter(), |
+ location_a0.program_counter(), nullptr}), |
+ task_c0); |
+ Closure task_b0_local = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, |
+ thread_b.message_loop()->task_runner(), location_b0, location_b1, |
+ ExpectedTrace({location_a1.program_counter(), |
+ location_a0.program_counter(), nullptr}), |
+ Bind(&DoNothing)); |
+ |
+ // Push one frame onto the stack in thread a then pass to thread b. |
+ Closure task_a1 = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, |
+ thread_b.message_loop()->task_runner(), location_a1, location_b0, |
+ ExpectedTrace({location_a0.program_counter(), nullptr}), |
+ Bind(&PendingTaskTest::RunTwo, task_b0_local, task_b0_fork)); |
+ Closure task_a0 = |
+ Bind(&PendingTaskTest::VerifyTraceAndPost, loop.task_runner(), |
+ location_a0, location_a1, ExpectedTrace({nullptr}), task_a1); |
+ |
+ loop.task_runner()->PostTask(location_a0, task_a0); |
+ |
+ RunLoop().RunUntilIdle(); |
+ |
+ thread_b.FlushForTesting(); |
+ thread_b.Stop(); |
+ |
+ thread_c.FlushForTesting(); |
+ thread_c.Stop(); |
+} |
+ |
+} // namespace base |