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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "mojo/edk/system/waitable_event.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 #include <stdlib.h> | |
| 9 | |
| 10 #include <atomic> | |
| 11 #include <thread> | |
| 12 #include <type_traits> | |
| 13 #include <vector> | |
| 14 | |
| 15 #include "mojo/edk/system/test/sleep.h" | |
| 16 #include "mojo/edk/system/test/stopwatch.h" | |
| 17 #include "mojo/edk/system/test/timeouts.h" | |
| 18 #include "mojo/public/cpp/system/macros.h" | |
| 19 #include "testing/gtest/include/gtest/gtest.h" | |
| 20 | |
| 21 namespace mojo { | |
| 22 namespace system { | |
| 23 namespace { | |
| 24 | |
| 25 // Sleeps for a "very small" amount of time. | |
| 26 void EpsilonRandomSleep() { | |
| 27 test::SleepMilliseconds(static_cast<unsigned>(rand()) % 20u); | |
| 28 } | |
| 29 | |
| 30 // We'll use |MojoDeadline| with |uint64_t| (for |WaitWithTimeout()|'s timeout | |
| 31 // argument), though note that |WaitWithTimeout()| doesn't support | |
| 32 // |MOJO_DEADLINE_INDEFINITE|. | |
| 33 static_assert(std::is_same<uint64_t, MojoDeadline>::value, | |
| 34 "MojoDeadline isn't uint64_t!"); | |
| 35 | |
| 36 // AutoResetWaitableEvent ------------------------------------------------------ | |
| 37 | |
| 38 TEST(AutoResetWaitableEventTest, Basic) { | |
| 39 AutoResetWaitableEvent ev; | |
| 40 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 41 ev.Signal(); | |
| 42 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 43 ev.Wait(); | |
| 44 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 45 ev.Reset(); | |
| 46 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 47 ev.Signal(); | |
| 48 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 49 ev.Reset(); | |
| 50 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 51 EXPECT_TRUE(ev.WaitWithTimeout(0)); | |
| 52 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 53 EXPECT_TRUE(ev.WaitWithTimeout(test::DeadlineFromMilliseconds(1))); | |
| 54 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 55 ev.Signal(); | |
| 56 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 57 EXPECT_FALSE(ev.WaitWithTimeout(0)); | |
| 58 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 59 EXPECT_TRUE(ev.WaitWithTimeout(test::DeadlineFromMilliseconds(1))); | |
| 60 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 61 ev.Signal(); | |
| 62 EXPECT_FALSE(ev.WaitWithTimeout(test::DeadlineFromMilliseconds(1))); | |
| 63 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 64 } | |
| 65 | |
| 66 TEST(AutoResetWaitableEventTest, MultipleWaiters) { | |
| 67 AutoResetWaitableEvent ev; | |
| 68 | |
| 69 for (size_t i = 0u; i < 5u; i++) { | |
| 70 std::atomic_uint wake_count(0u); | |
| 71 std::vector<std::thread> threads; | |
| 72 for (size_t j = 0u; j < 4u; j++) { | |
| 73 threads.push_back(std::thread([&ev, &wake_count]() { | |
| 74 if (rand() % 2 == 0) | |
| 75 ev.Wait(); | |
| 76 else | |
| 77 EXPECT_FALSE(ev.WaitWithTimeout(test::ActionTimeout())); | |
| 78 wake_count.fetch_add(1u); | |
| 79 // Note: We can't say anything about the signaled state of |ev| here, | |
| 80 // since the main thread may have already signaled it again. | |
| 81 })); | |
| 82 } | |
| 83 | |
| 84 // Unfortunately, we can't really wait for the threads to be waiting, so we | |
| 85 // just sleep for a bit, and count on them having started and advanced to | |
| 86 // waiting. | |
| 87 test::Sleep(2 * test::TinyTimeout()); | |
| 88 | |
| 89 for (size_t j = 0u; j < threads.size(); j++) { | |
| 90 unsigned old_wake_count = wake_count.load(); | |
| 91 EXPECT_EQ(j, old_wake_count); | |
| 92 | |
| 93 // Each |Signal()| should wake exactly one thread. | |
| 94 ev.Signal(); | |
| 95 | |
| 96 // Poll for |wake_count| to change. | |
| 97 while (wake_count.load() == old_wake_count) | |
| 98 test::Sleep(test::EpsilonTimeout()); | |
| 99 | |
| 100 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 101 | |
| 102 // And once it's changed, wait a little longer, to see if any other | |
| 103 // threads are awoken (they shouldn't be). | |
| 104 test::Sleep(test::EpsilonTimeout()); | |
| 105 | |
| 106 EXPECT_EQ(old_wake_count + 1u, wake_count.load()); | |
| 107 | |
| 108 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 109 } | |
| 110 | |
| 111 // Having done that, if we signal |ev| now, it should stay signaled. | |
| 112 ev.Signal(); | |
| 113 test::Sleep(test::EpsilonTimeout()); | |
| 114 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 115 | |
| 116 for (auto& thread : threads) | |
| 117 thread.join(); | |
| 118 | |
| 119 ev.Reset(); | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 TEST(AutoResetWaitableEventTest, Timeouts) { | |
| 124 static const unsigned kTestTimeoutsMs[] = {0, 10, 20, 40, 80}; | |
| 125 | |
| 126 test::Stopwatch stopwatch; | |
| 127 | |
| 128 AutoResetWaitableEvent ev; | |
| 129 | |
| 130 for (size_t i = 0u; i < MOJO_ARRAYSIZE(kTestTimeoutsMs); i++) { | |
| 131 uint64_t timeout = test::DeadlineFromMilliseconds(kTestTimeoutsMs[i]); | |
| 132 | |
| 133 stopwatch.Start(); | |
| 134 EXPECT_TRUE(ev.WaitWithTimeout(timeout)); | |
| 135 MojoDeadline elapsed = stopwatch.Elapsed(); | |
| 136 | |
| 137 // It should time out after *at least* the specified amount of time. | |
| 138 EXPECT_GE(elapsed, timeout); | |
| 139 // But we expect that it should time out soon after that amount of time. | |
| 140 EXPECT_LT(elapsed, timeout + test::EpsilonTimeout()); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // ManualResetWaitableEvent ---------------------------------------------------- | |
| 145 | |
| 146 TEST(ManualResetWaitableEventTest, Basic) { | |
| 147 ManualResetWaitableEvent ev; | |
| 148 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 149 ev.Signal(); | |
| 150 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 151 ev.Wait(); | |
| 152 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 153 ev.Reset(); | |
| 154 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 155 EXPECT_TRUE(ev.WaitWithTimeout(0)); | |
| 156 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 157 EXPECT_TRUE(ev.WaitWithTimeout(test::DeadlineFromMilliseconds(1))); | |
| 158 EXPECT_FALSE(ev.IsSignaledForTest()); | |
| 159 ev.Signal(); | |
| 160 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 161 EXPECT_FALSE(ev.WaitWithTimeout(0)); | |
| 162 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 163 EXPECT_FALSE(ev.WaitWithTimeout(test::DeadlineFromMilliseconds(1))); | |
| 164 EXPECT_TRUE(ev.IsSignaledForTest()); | |
| 165 } | |
| 166 | |
| 167 TEST(ManualResetWaitableEventTest, SignalMultiple) { | |
| 168 ManualResetWaitableEvent ev; | |
| 169 | |
| 170 for (size_t i = 0u; i < 10u; i++) { | |
| 171 for (size_t num_waiters = 1u; num_waiters < 5u; num_waiters++) { | |
| 172 std::vector<std::thread> threads; | |
| 173 for (size_t j = 0u; j < num_waiters; j++) { | |
| 174 threads.push_back(std::thread([&ev]() { | |
| 175 EpsilonRandomSleep(); | |
| 176 | |
| 177 if (rand() % 2 == 0) | |
| 178 ev.Wait(); | |
| 179 else | |
| 180 EXPECT_FALSE(ev.WaitWithTimeout(test::ActionTimeout())); | |
| 181 })); | |
| 182 } | |
| 183 | |
| 184 EpsilonRandomSleep(); | |
| 185 | |
| 186 ev.Signal(); | |
| 187 | |
| 188 // The threads will only terminate once they've successfully waited (or | |
| 189 // timed out). | |
| 190 for (auto& thread : threads) | |
| 191 thread.join(); | |
| 192 | |
| 193 ev.Reset(); | |
| 194 } | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 // Tries to test that threads that are awoken may immediately call |Reset()| | |
| 199 // without affecting other threads that are awoken. | |
| 200 TEST(ManualResetWaitableEventTest, SignalMultipleWaitReset) { | |
| 201 ManualResetWaitableEvent ev; | |
| 202 | |
| 203 for (size_t i = 0u; i < 5u; i++) { | |
| 204 std::vector<std::thread> threads; | |
| 205 for (size_t j = 0u; j < 4u; j++) { | |
| 206 threads.push_back(std::thread([&ev]() { | |
| 207 if (rand() % 2 == 0) | |
| 208 ev.Wait(); | |
| 209 else | |
| 210 EXPECT_FALSE(ev.WaitWithTimeout(test::ActionTimeout())); | |
| 211 ev.Reset(); | |
| 212 })); | |
| 213 } | |
| 214 | |
| 215 // Unfortunately, we can't really wait for the threads to be waiting, so we | |
| 216 // just sleep for a bit, and count on them having started and advanced to | |
| 217 // waiting. | |
| 218 test::Sleep(2 * test::TinyTimeout()); | |
| 219 | |
| 220 ev.Signal(); | |
| 221 | |
| 222 // In fact, we may ourselves call |Reset()| immediately. | |
| 223 ev.Reset(); | |
| 224 | |
| 225 // The threads will only terminate once they've successfully waited (or | |
| 226 // timed out). | |
| 227 for (auto& thread : threads) | |
| 228 thread.join(); | |
| 229 | |
| 230 ASSERT_FALSE(ev.IsSignaledForTest()); | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 TEST(ManualResetWaitableEventTest, Timeouts) { | |
| 235 static const unsigned kTestTimeoutsMs[] = {0, 10, 20, 40, 80}; | |
| 236 | |
| 237 test::Stopwatch stopwatch; | |
| 238 | |
| 239 ManualResetWaitableEvent ev; | |
| 240 | |
| 241 for (size_t i = 0u; i < MOJO_ARRAYSIZE(kTestTimeoutsMs); i++) { | |
| 242 uint64_t timeout = test::DeadlineFromMilliseconds(kTestTimeoutsMs[i]); | |
| 243 | |
| 244 stopwatch.Start(); | |
| 245 EXPECT_TRUE(ev.WaitWithTimeout(timeout)); | |
| 246 MojoDeadline elapsed = stopwatch.Elapsed(); | |
| 247 | |
| 248 // It should time out after *at least* the specified amount of time. | |
| 249 EXPECT_GE(elapsed, timeout); | |
| 250 // But we expect that it should time out soon after that amount of time. | |
| 251 EXPECT_LT(elapsed, timeout + test::EpsilonTimeout()); | |
| 252 } | |
| 253 } | |
| 254 | |
| 255 } // namespace | |
| 256 } // namespace system | |
| 257 } // namespace mojo | |
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Chromium Code Reviews
Issue 1408003013:
Reland "EDK: Move //mojo/edk/system/waitable_event* to edk/util." (Closed)
Base URL: https://github.com/domokit/mojo.git@master