| // Copyright 2020 The Pigweed 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 <chrono> |
| |
| #include "gtest/gtest.h" |
| #include "pw_chrono/system_clock.h" |
| #include "pw_sync/counting_semaphore.h" |
| |
| using pw::chrono::SystemClock; |
| |
| namespace pw::sync { |
| namespace { |
| |
| extern "C" { |
| |
| // Functions defined in counting_semaphore_facade_test_c.c which call the API |
| // from C. |
| void pw_sync_CountingSemaphore_CallRelease( |
| pw_sync_CountingSemaphore* semaphore); |
| void pw_sync_CountingSemaphore_CallReleaseNum( |
| pw_sync_CountingSemaphore* semaphore, ptrdiff_t update); |
| void pw_sync_CountingSemaphore_CallAcquire( |
| pw_sync_CountingSemaphore* semaphore); |
| bool pw_sync_CountingSemaphore_CallTryAcquire( |
| pw_sync_CountingSemaphore* semaphore); |
| bool pw_sync_CountingSemaphore_CallTryAcquireFor( |
| pw_sync_CountingSemaphore* semaphore, |
| pw_chrono_SystemClock_TickCount for_at_least); |
| bool pw_sync_CountingSemaphore_CallTryAcquireUntil( |
| pw_sync_CountingSemaphore* semaphore, |
| pw_chrono_SystemClock_TimePoint until_at_least); |
| ptrdiff_t pw_sync_CountingSemaphore_CallMax(void); |
| |
| } // extern "C" |
| |
| static constexpr auto kArbitraryDuration = std::chrono::milliseconds(42); |
| // We can't control the SystemClock's period configuration, so just in case |
| // duration cannot be accurately expressed in integer ticks, round the |
| // duration w/ duration_cast. |
| static constexpr auto kRoundedArbitraryDuration = |
| std::chrono::duration_cast<SystemClock::duration>(kArbitraryDuration); |
| static constexpr pw_chrono_SystemClock_TickCount kRoundedArbitraryDurationInC = |
| kRoundedArbitraryDuration.count(); |
| |
| TEST(CountingSemaphore, EmptyInitialState) { |
| CountingSemaphore semaphore; |
| EXPECT_FALSE(semaphore.try_acquire()); |
| } |
| |
| // TODO(pwbug/291): Add real concurrency tests once we have pw::thread. |
| |
| TEST(CountingSemaphore, SingleRelease) { |
| CountingSemaphore semaphore; |
| semaphore.release(); |
| semaphore.release(); |
| semaphore.acquire(); |
| semaphore.acquire(); |
| // Ensure it fails when empty. |
| EXPECT_FALSE(semaphore.try_acquire()); |
| } |
| |
| CountingSemaphore empty_initial_semaphore; |
| TEST(CountingSemaphore, EmptyInitialStateStatic) { |
| EXPECT_FALSE(empty_initial_semaphore.try_acquire()); |
| } |
| |
| CountingSemaphore release_semaphore; |
| TEST(CountingSemaphore, ReleaseStatic) { |
| release_semaphore.release(); |
| release_semaphore.release(); |
| release_semaphore.acquire(); |
| release_semaphore.acquire(); |
| // Ensure it fails when empty. |
| EXPECT_FALSE(release_semaphore.try_acquire()); |
| } |
| |
| TEST(CountingSemaphore, MultiRelease) { |
| CountingSemaphore semaphore; |
| semaphore.release(2); |
| semaphore.release(1); |
| semaphore.acquire(); |
| semaphore.acquire(); |
| semaphore.acquire(); |
| // Ensure it fails when empty. |
| EXPECT_FALSE(semaphore.try_acquire()); |
| } |
| |
| TEST(CountingSemaphore, TryAcquireFor) { |
| CountingSemaphore semaphore; |
| semaphore.release(); |
| |
| SystemClock::time_point before = SystemClock::now(); |
| EXPECT_TRUE(semaphore.try_acquire_for(kRoundedArbitraryDuration)); |
| SystemClock::duration time_elapsed = SystemClock::now() - before; |
| EXPECT_LT(time_elapsed, kRoundedArbitraryDuration); |
| |
| // Ensure it blocks and fails when empty. |
| before = SystemClock::now(); |
| EXPECT_FALSE(semaphore.try_acquire_for(kRoundedArbitraryDuration)); |
| time_elapsed = SystemClock::now() - before; |
| EXPECT_GE(time_elapsed, kRoundedArbitraryDuration); |
| } |
| |
| TEST(CountingSemaphore, TryAcquireUntil) { |
| CountingSemaphore semaphore; |
| semaphore.release(); |
| |
| const SystemClock::time_point deadline = |
| SystemClock::now() + kRoundedArbitraryDuration; |
| EXPECT_TRUE(semaphore.try_acquire_until(deadline)); |
| EXPECT_LT(SystemClock::now(), deadline); |
| |
| // Ensure it blocks and fails when empty. |
| EXPECT_FALSE(semaphore.try_acquire_until(deadline)); |
| EXPECT_GE(SystemClock::now(), deadline); |
| } |
| |
| TEST(CountingSemaphore, EmptyInitialStateInC) { |
| CountingSemaphore semaphore; |
| EXPECT_FALSE(pw_sync_CountingSemaphore_CallTryAcquire(&semaphore)); |
| } |
| |
| TEST(CountingSemaphore, SingeReleaseInC) { |
| CountingSemaphore semaphore; |
| pw_sync_CountingSemaphore_CallRelease(&semaphore); |
| pw_sync_CountingSemaphore_CallRelease(&semaphore); |
| pw_sync_CountingSemaphore_CallAcquire(&semaphore); |
| pw_sync_CountingSemaphore_CallAcquire(&semaphore); |
| // Ensure it fails when empty. |
| EXPECT_FALSE(pw_sync_CountingSemaphore_CallTryAcquire(&semaphore)); |
| } |
| |
| TEST(CountingSemaphore, MultiReleaseInC) { |
| CountingSemaphore semaphore; |
| pw_sync_CountingSemaphore_CallReleaseNum(&semaphore, 2); |
| pw_sync_CountingSemaphore_CallReleaseNum(&semaphore, 1); |
| pw_sync_CountingSemaphore_CallAcquire(&semaphore); |
| pw_sync_CountingSemaphore_CallAcquire(&semaphore); |
| pw_sync_CountingSemaphore_CallAcquire(&semaphore); |
| // Ensure it fails when empty. |
| EXPECT_FALSE(pw_sync_CountingSemaphore_CallTryAcquire(&semaphore)); |
| } |
| |
| TEST(CountingSemaphore, TryAcquireForInC) { |
| CountingSemaphore semaphore; |
| pw_sync_CountingSemaphore_CallRelease(&semaphore); |
| |
| pw_chrono_SystemClock_TimePoint before = pw_chrono_SystemClock_Now(); |
| ASSERT_TRUE(pw_sync_CountingSemaphore_CallTryAcquireFor( |
| &semaphore, kRoundedArbitraryDurationInC)); |
| pw_chrono_SystemClock_TickCount time_elapsed = |
| pw_chrono_SystemClock_Now().ticks_since_epoch - before.ticks_since_epoch; |
| EXPECT_LT(time_elapsed, kRoundedArbitraryDurationInC); |
| |
| // Ensure it blocks and fails when empty. |
| before = pw_chrono_SystemClock_Now(); |
| EXPECT_FALSE(pw_sync_CountingSemaphore_CallTryAcquireFor( |
| &semaphore, kRoundedArbitraryDurationInC)); |
| time_elapsed = |
| pw_chrono_SystemClock_Now().ticks_since_epoch - before.ticks_since_epoch; |
| EXPECT_GE(time_elapsed, kRoundedArbitraryDurationInC); |
| } |
| |
| TEST(CountingSemaphore, TryAcquireUntilInC) { |
| CountingSemaphore semaphore; |
| pw_sync_CountingSemaphore_CallRelease(&semaphore); |
| |
| pw_chrono_SystemClock_TimePoint deadline; |
| deadline.ticks_since_epoch = pw_chrono_SystemClock_Now().ticks_since_epoch + |
| kRoundedArbitraryDurationInC; |
| ASSERT_TRUE( |
| pw_sync_CountingSemaphore_CallTryAcquireUntil(&semaphore, deadline)); |
| EXPECT_LT(pw_chrono_SystemClock_Now().ticks_since_epoch, |
| deadline.ticks_since_epoch); |
| |
| // Ensure it blocks and fails when empty. |
| EXPECT_FALSE( |
| pw_sync_CountingSemaphore_CallTryAcquireUntil(&semaphore, deadline)); |
| EXPECT_GE(pw_chrono_SystemClock_Now().ticks_since_epoch, |
| deadline.ticks_since_epoch); |
| } |
| |
| TEST(CountingSemaphore, MaxInC) { |
| EXPECT_EQ(CountingSemaphore::max(), pw_sync_CountingSemaphore_Max()); |
| } |
| |
| } // namespace |
| } // namespace pw::sync |