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authorGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
committerGravatar misterg <misterg@google.com>2017-09-19 16:54:40 -0400
commitc2e754829628d1e9b7a16b3389cfdace76950fdf (patch)
tree5a7f056f44e27c30e10025113b644f0b3b5801fc /absl/base/internal/sysinfo_test.cc
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+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/sysinfo.h"
+
+#ifndef _WIN32
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include <thread> // NOLINT(build/c++11)
+#include <unordered_set>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/synchronization/barrier.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+namespace base_internal {
+namespace {
+
+TEST(SysinfoTest, NumCPUs) {
+ EXPECT_NE(NumCPUs(), 0)
+ << "NumCPUs() should not have the default value of 0";
+}
+
+TEST(SysinfoTest, NominalCPUFrequency) {
+#if !(defined(__aarch64__) && defined(__linux__))
+ EXPECT_GE(NominalCPUFrequency(), 1000.0)
+ << "NominalCPUFrequency() did not return a reasonable value";
+#else
+ // TODO(b/37919252): Aarch64 cannot read the CPU frequency from sysfs, so we
+ // get back 1.0. Fix once the value is available.
+ EXPECT_EQ(NominalCPUFrequency(), 1.0)
+ << "CPU frequency detection was fixed! Please update unittest and "
+ "b/37919252";
+#endif
+}
+
+TEST(SysinfoTest, GetTID) {
+ EXPECT_EQ(GetTID(), GetTID()); // Basic compile and equality test.
+#ifdef __native_client__
+ // Native Client has a race condition bug that leads to memory
+ // exaustion when repeatedly creating and joining threads.
+ // https://bugs.chromium.org/p/nativeclient/issues/detail?id=1027
+ return;
+#endif
+ // Test that TIDs are unique to each thread.
+ // Uses a few loops to exercise implementations that reallocate IDs.
+ for (int i = 0; i < 32; ++i) {
+ constexpr int kNumThreads = 64;
+ Barrier all_threads_done(kNumThreads);
+ std::vector<std::thread> threads;
+
+ Mutex mutex;
+ std::unordered_set<pid_t> tids;
+
+ for (int j = 0; j < kNumThreads; ++j) {
+ threads.push_back(std::thread([&]() {
+ pid_t id = GetTID();
+ {
+ MutexLock lock(&mutex);
+ ASSERT_TRUE(tids.find(id) == tids.end());
+ tids.insert(id);
+ }
+ // We can't simply join the threads here. The threads need to
+ // be alive otherwise the TID might have been reallocated to
+ // another live thread.
+ all_threads_done.Block();
+ }));
+ }
+ for (auto& thread : threads) {
+ thread.join();
+ }
+ }
+}
+
+#ifdef __linux__
+TEST(SysinfoTest, LinuxGetTID) {
+ // On Linux, for the main thread, GetTID()==getpid() is guaranteed by the API.
+ EXPECT_EQ(GetTID(), getpid());
+}
+#endif
+
+} // namespace
+} // namespace base_internal
+} // namespace absl