Abseil Common Libraries (C++) (grcp 依赖)
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98 lines
2.9 KiB
98 lines
2.9 KiB
// 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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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__)) |
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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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// TODO(absl-team): Aarch64 cannot read the CPU frequency from sysfs, so we |
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// get back 1.0. Fix once the value is available. |
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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 < 32; ++i) { |
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constexpr int kNumThreads = 64; |
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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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} // namespace absl
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