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// Copyright 2016 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 <string.h>
#include <memory>
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread.h"
#include "base/trace_event/category_registry.h"
#include "base/trace_event/trace_category.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace trace_event {
// Static initializers are generally forbidden. However, in the past we ran in
// the case of some test using tracing in a static initializer. This test checks
// That the category registry doesn't rely on static initializers itself and is
// functional even if called from another static initializer.
bool Initializer() {
return CategoryRegistry::kCategoryMetadata &&
CategoryRegistry::kCategoryMetadata->is_valid();
}
bool g_initializer_check = Initializer();
class TraceCategoryTest : public testing::Test {
public:
void SetUp() override { CategoryRegistry::Initialize(); }
void TearDown() override { CategoryRegistry::ResetForTesting(); }
static bool GetOrCreateCategoryByName(const char* name, TraceCategory** cat) {
static LazyInstance<Lock>::Leaky g_lock = LAZY_INSTANCE_INITIALIZER;
bool is_new_cat = false;
*cat = CategoryRegistry::GetCategoryByName(name);
if (!*cat) {
AutoLock lock(g_lock.Get());
is_new_cat = CategoryRegistry::GetOrCreateCategoryLocked(
name, [](TraceCategory*) {}, cat);
}
return is_new_cat;
};
static CategoryRegistry::Range GetAllCategories() {
return CategoryRegistry::GetAllCategories();
}
static void TestRaceThreadMain(WaitableEvent* event) {
TraceCategory* cat = nullptr;
event->Wait();
GetOrCreateCategoryByName("__test_race", &cat);
EXPECT_NE(nullptr, cat);
}
};
TEST_F(TraceCategoryTest, Basic) {
ASSERT_NE(nullptr, CategoryRegistry::kCategoryMetadata);
ASSERT_TRUE(CategoryRegistry::kCategoryMetadata->is_valid());
ASSERT_FALSE(CategoryRegistry::kCategoryMetadata->is_enabled());
// Metadata category is built-in and should create a new category.
TraceCategory* cat_meta = nullptr;
const char* kMetadataName = CategoryRegistry::kCategoryMetadata->name();
ASSERT_FALSE(GetOrCreateCategoryByName(kMetadataName, &cat_meta));
ASSERT_EQ(CategoryRegistry::kCategoryMetadata, cat_meta);
TraceCategory* cat_1 = nullptr;
ASSERT_TRUE(GetOrCreateCategoryByName("__test_basic_ab", &cat_1));
ASSERT_FALSE(cat_1->is_enabled());
ASSERT_EQ(0u, cat_1->enabled_filters());
cat_1->set_state_flag(TraceCategory::ENABLED_FOR_RECORDING);
cat_1->set_state_flag(TraceCategory::ENABLED_FOR_FILTERING);
ASSERT_EQ(TraceCategory::ENABLED_FOR_RECORDING |
TraceCategory::ENABLED_FOR_FILTERING,
cat_1->state());
cat_1->set_enabled_filters(129);
ASSERT_EQ(129u, cat_1->enabled_filters());
ASSERT_EQ(cat_1, CategoryRegistry::GetCategoryByStatePtr(cat_1->state_ptr()));
cat_1->clear_state_flag(TraceCategory::ENABLED_FOR_FILTERING);
ASSERT_EQ(TraceCategory::ENABLED_FOR_RECORDING, cat_1->state());
ASSERT_EQ(TraceCategory::ENABLED_FOR_RECORDING, *cat_1->state_ptr());
ASSERT_TRUE(cat_1->is_enabled());
TraceCategory* cat_2 = nullptr;
ASSERT_TRUE(GetOrCreateCategoryByName("__test_basic_a", &cat_2));
ASSERT_FALSE(cat_2->is_enabled());
cat_2->set_state_flag(TraceCategory::ENABLED_FOR_RECORDING);
TraceCategory* cat_2_copy = nullptr;
ASSERT_FALSE(GetOrCreateCategoryByName("__test_basic_a", &cat_2_copy));
ASSERT_EQ(cat_2, cat_2_copy);
TraceCategory* cat_3 = nullptr;
ASSERT_TRUE(
GetOrCreateCategoryByName("__test_basic_ab,__test_basic_a", &cat_3));
ASSERT_FALSE(cat_3->is_enabled());
ASSERT_EQ(0u, cat_3->enabled_filters());
int num_test_categories_seen = 0;
for (const TraceCategory& cat : GetAllCategories()) {
if (strcmp(cat.name(), kMetadataName) == 0)
ASSERT_TRUE(CategoryRegistry::IsBuiltinCategory(&cat));
if (strncmp(cat.name(), "__test_basic_", 13) == 0) {
ASSERT_FALSE(CategoryRegistry::IsBuiltinCategory(&cat));
num_test_categories_seen++;
}
}
ASSERT_EQ(3, num_test_categories_seen);
ASSERT_TRUE(g_initializer_check);
}
// Tries to cover the case of multiple threads creating the same category
// simultaeously. Should never end up with distinct entries with the same name.
TEST_F(TraceCategoryTest, ThreadRaces) {
const int kNumThreads = 32;
std::unique_ptr<Thread> threads[kNumThreads];
for (int i = 0; i < kNumThreads; i++) {
threads[i].reset(new Thread("test thread"));
threads[i]->Start();
}
WaitableEvent sync_event(WaitableEvent::ResetPolicy::MANUAL,
WaitableEvent::InitialState::NOT_SIGNALED);
for (int i = 0; i < kNumThreads; i++) {
threads[i]->task_runner()->PostTask(
FROM_HERE, Bind(&TestRaceThreadMain, Unretained(&sync_event)));
}
sync_event.Signal();
for (int i = 0; i < kNumThreads; i++)
threads[i]->Stop();
int num_times_seen = 0;
for (const TraceCategory& cat : GetAllCategories()) {
if (strcmp(cat.name(), "__test_race") == 0)
num_times_seen++;
}
ASSERT_EQ(1, num_times_seen);
}
} // namespace trace_event
} // namespace base
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