diff options
Diffstat (limited to 'abseil-cpp/absl/synchronization/internal/waiter_test.cc')
| -rw-r--r-- | abseil-cpp/absl/synchronization/internal/waiter_test.cc | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/abseil-cpp/absl/synchronization/internal/waiter_test.cc b/abseil-cpp/absl/synchronization/internal/waiter_test.cc new file mode 100644 index 0000000..992db29 --- /dev/null +++ b/abseil-cpp/absl/synchronization/internal/waiter_test.cc @@ -0,0 +1,180 @@ +// Copyright 2023 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 +// +// https://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/synchronization/internal/waiter.h" + +#include <ctime> +#include <iostream> +#include <ostream> + +#include "absl/base/config.h" +#include "absl/random/random.h" +#include "absl/synchronization/internal/create_thread_identity.h" +#include "absl/synchronization/internal/futex_waiter.h" +#include "absl/synchronization/internal/kernel_timeout.h" +#include "absl/synchronization/internal/pthread_waiter.h" +#include "absl/synchronization/internal/sem_waiter.h" +#include "absl/synchronization/internal/stdcpp_waiter.h" +#include "absl/synchronization/internal/thread_pool.h" +#include "absl/synchronization/internal/win32_waiter.h" +#include "absl/time/clock.h" +#include "absl/time/time.h" +#include "gtest/gtest.h" + +// Test go/btm support by randomizing the value of clock_gettime() for +// CLOCK_MONOTONIC. This works by overriding a weak symbol in glibc. +// We should be resistant to this randomization when !SupportsSteadyClock(). +#if defined(__GOOGLE_GRTE_VERSION__) && \ + !defined(ABSL_HAVE_ADDRESS_SANITIZER) && \ + !defined(ABSL_HAVE_MEMORY_SANITIZER) && \ + !defined(ABSL_HAVE_THREAD_SANITIZER) +extern "C" int __clock_gettime(clockid_t c, struct timespec* ts); + +extern "C" int clock_gettime(clockid_t c, struct timespec* ts) { + if (c == CLOCK_MONOTONIC && + !absl::synchronization_internal::KernelTimeout::SupportsSteadyClock()) { + absl::SharedBitGen gen; + ts->tv_sec = absl::Uniform(gen, 0, 1'000'000'000); + ts->tv_nsec = absl::Uniform(gen, 0, 1'000'000'000); + return 0; + } + return __clock_gettime(c, ts); +} +#endif + +namespace { + +TEST(Waiter, PrintPlatformImplementation) { + // Allows us to verify that the platform is using the expected implementation. + std::cout << absl::synchronization_internal::Waiter::kName << std::endl; +} + +template <typename T> +class WaiterTest : public ::testing::Test { + public: + // Waiter implementations assume that a ThreadIdentity has already been + // created. + WaiterTest() { + absl::synchronization_internal::GetOrCreateCurrentThreadIdentity(); + } +}; + +TYPED_TEST_SUITE_P(WaiterTest); + +absl::Duration WithTolerance(absl::Duration d) { return d * 0.95; } + +TYPED_TEST_P(WaiterTest, WaitNoTimeout) { + absl::synchronization_internal::ThreadPool tp(1); + TypeParam waiter; + tp.Schedule([&]() { + // Include some `Poke()` calls to ensure they don't cause `waiter` to return + // from `Wait()`. + waiter.Poke(); + absl::SleepFor(absl::Seconds(1)); + waiter.Poke(); + absl::SleepFor(absl::Seconds(1)); + waiter.Post(); + }); + absl::Time start = absl::Now(); + EXPECT_TRUE( + waiter.Wait(absl::synchronization_internal::KernelTimeout::Never())); + absl::Duration waited = absl::Now() - start; + EXPECT_GE(waited, WithTolerance(absl::Seconds(2))); +} + +TYPED_TEST_P(WaiterTest, WaitDurationWoken) { + absl::synchronization_internal::ThreadPool tp(1); + TypeParam waiter; + tp.Schedule([&]() { + // Include some `Poke()` calls to ensure they don't cause `waiter` to return + // from `Wait()`. + waiter.Poke(); + absl::SleepFor(absl::Milliseconds(500)); + waiter.Post(); + }); + absl::Time start = absl::Now(); + EXPECT_TRUE(waiter.Wait( + absl::synchronization_internal::KernelTimeout(absl::Seconds(10)))); + absl::Duration waited = absl::Now() - start; + EXPECT_GE(waited, WithTolerance(absl::Milliseconds(500))); + EXPECT_LT(waited, absl::Seconds(2)); +} + +TYPED_TEST_P(WaiterTest, WaitTimeWoken) { + absl::synchronization_internal::ThreadPool tp(1); + TypeParam waiter; + tp.Schedule([&]() { + // Include some `Poke()` calls to ensure they don't cause `waiter` to return + // from `Wait()`. + waiter.Poke(); + absl::SleepFor(absl::Milliseconds(500)); + waiter.Post(); + }); + absl::Time start = absl::Now(); + EXPECT_TRUE(waiter.Wait(absl::synchronization_internal::KernelTimeout( + start + absl::Seconds(10)))); + absl::Duration waited = absl::Now() - start; + EXPECT_GE(waited, WithTolerance(absl::Milliseconds(500))); + EXPECT_LT(waited, absl::Seconds(2)); +} + +TYPED_TEST_P(WaiterTest, WaitDurationReached) { + TypeParam waiter; + absl::Time start = absl::Now(); + EXPECT_FALSE(waiter.Wait( + absl::synchronization_internal::KernelTimeout(absl::Milliseconds(500)))); + absl::Duration waited = absl::Now() - start; + EXPECT_GE(waited, WithTolerance(absl::Milliseconds(500))); + EXPECT_LT(waited, absl::Seconds(1)); +} + +TYPED_TEST_P(WaiterTest, WaitTimeReached) { + TypeParam waiter; + absl::Time start = absl::Now(); + EXPECT_FALSE(waiter.Wait(absl::synchronization_internal::KernelTimeout( + start + absl::Milliseconds(500)))); + absl::Duration waited = absl::Now() - start; + EXPECT_GE(waited, WithTolerance(absl::Milliseconds(500))); + EXPECT_LT(waited, absl::Seconds(1)); +} + +REGISTER_TYPED_TEST_SUITE_P(WaiterTest, + WaitNoTimeout, + WaitDurationWoken, + WaitTimeWoken, + WaitDurationReached, + WaitTimeReached); + +#ifdef ABSL_INTERNAL_HAVE_FUTEX_WAITER +INSTANTIATE_TYPED_TEST_SUITE_P(Futex, WaiterTest, + absl::synchronization_internal::FutexWaiter); +#endif +#ifdef ABSL_INTERNAL_HAVE_PTHREAD_WAITER +INSTANTIATE_TYPED_TEST_SUITE_P(Pthread, WaiterTest, + absl::synchronization_internal::PthreadWaiter); +#endif +#ifdef ABSL_INTERNAL_HAVE_SEM_WAITER +INSTANTIATE_TYPED_TEST_SUITE_P(Sem, WaiterTest, + absl::synchronization_internal::SemWaiter); +#endif +#ifdef ABSL_INTERNAL_HAVE_WIN32_WAITER +INSTANTIATE_TYPED_TEST_SUITE_P(Win32, WaiterTest, + absl::synchronization_internal::Win32Waiter); +#endif +#ifdef ABSL_INTERNAL_HAVE_STDCPP_WAITER +INSTANTIATE_TYPED_TEST_SUITE_P(Stdcpp, WaiterTest, + absl::synchronization_internal::StdcppWaiter); +#endif + +} // namespace |