fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
100 lines
3 KiB
C++
100 lines
3 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/base/internal/sysinfo.h"
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#ifndef _WIN32
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#include <thread> // NOLINT(build/c++11)
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#include <unordered_set>
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#include <vector>
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#include "gtest/gtest.h"
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#include "absl/synchronization/barrier.h"
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#include "absl/synchronization/mutex.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace base_internal {
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namespace {
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TEST(SysinfoTest, NumCPUs) {
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EXPECT_NE(NumCPUs(), 0)
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<< "NumCPUs() should not have the default value of 0";
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}
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TEST(SysinfoTest, NominalCPUFrequency) {
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#if !(defined(__aarch64__) && defined(__linux__)) && !defined(__EMSCRIPTEN__)
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EXPECT_GE(NominalCPUFrequency(), 1000.0)
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<< "NominalCPUFrequency() did not return a reasonable value";
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#else
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// Aarch64 cannot read the CPU frequency from sysfs, so we get back 1.0.
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// Emscripten does not have a sysfs to read from at all.
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EXPECT_EQ(NominalCPUFrequency(), 1.0)
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<< "CPU frequency detection was fixed! Please update unittest.";
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#endif
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}
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TEST(SysinfoTest, GetTID) {
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EXPECT_EQ(GetTID(), GetTID()); // Basic compile and equality test.
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#ifdef __native_client__
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// Native Client has a race condition bug that leads to memory
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// exaustion when repeatedly creating and joining threads.
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// https://bugs.chromium.org/p/nativeclient/issues/detail?id=1027
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return;
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#endif
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// Test that TIDs are unique to each thread.
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// Uses a few loops to exercise implementations that reallocate IDs.
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for (int i = 0; i < 10; ++i) {
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constexpr int kNumThreads = 10;
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Barrier all_threads_done(kNumThreads);
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std::vector<std::thread> threads;
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Mutex mutex;
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std::unordered_set<pid_t> tids;
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for (int j = 0; j < kNumThreads; ++j) {
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threads.push_back(std::thread([&]() {
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pid_t id = GetTID();
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{
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MutexLock lock(&mutex);
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ASSERT_TRUE(tids.find(id) == tids.end());
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tids.insert(id);
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}
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// We can't simply join the threads here. The threads need to
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// be alive otherwise the TID might have been reallocated to
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// another live thread.
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all_threads_done.Block();
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}));
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}
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for (auto& thread : threads) {
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thread.join();
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}
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}
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}
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#ifdef __linux__
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TEST(SysinfoTest, LinuxGetTID) {
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// On Linux, for the main thread, GetTID()==getpid() is guaranteed by the API.
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EXPECT_EQ(GetTID(), getpid());
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}
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#endif
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} // namespace
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} // namespace base_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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