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19 #include <folly/io/async/HHWheelTimer.h>
20 #include <folly/io/async/EventBase.h>
21 #include <folly/io/async/test/UndelayedDestruction.h>
22 #include <folly/io/async/test/Util.h>
24 #include <gtest/gtest.h>
27 using namespace folly;
28 using std::chrono::milliseconds;
30 typedef UndelayedDestruction<HHWheelTimer> StackWheelTimer;
32 class TestTimeout : public HHWheelTimer::Callback {
35 TestTimeout(HHWheelTimer* t, milliseconds timeout) {
36 t->scheduleTimeout(this, timeout);
38 virtual void timeoutExpired() noexcept {
39 timestamps.push_back(TimePoint());
45 std::deque<TimePoint> timestamps;
46 std::function<void()> fn;
50 class TestTimeoutDelayed : public TestTimeout {
52 std::chrono::milliseconds getCurTime() override {
53 return std::chrono::duration_cast<std::chrono::milliseconds>(
54 std::chrono::steady_clock::now().time_since_epoch()) -
60 * Test firing some simple timeouts that are fired once and never rescheduled
62 TEST(HHWheelTimerTest, FireOnce) {
64 StackWheelTimer t(&eventBase, milliseconds(1));
66 const HHWheelTimer::Callback* nullCallback = nullptr;
72 ASSERT_EQ(t.count(), 0);
74 t.scheduleTimeout(&t1, milliseconds(5));
75 t.scheduleTimeout(&t2, milliseconds(5));
76 // Verify scheduling it twice cancels, then schedules.
77 // Should only get one callback.
78 t.scheduleTimeout(&t2, milliseconds(5));
79 t.scheduleTimeout(&t3, milliseconds(10));
81 ASSERT_EQ(t.count(), 3);
87 ASSERT_EQ(t1.timestamps.size(), 1);
88 ASSERT_EQ(t2.timestamps.size(), 1);
89 ASSERT_EQ(t3.timestamps.size(), 1);
91 ASSERT_EQ(t.count(), 0);
93 T_CHECK_TIMEOUT(start, t1.timestamps[0], milliseconds(5));
94 T_CHECK_TIMEOUT(start, t2.timestamps[0], milliseconds(5));
95 T_CHECK_TIMEOUT(start, t3.timestamps[0], milliseconds(10));
96 T_CHECK_TIMEOUT(start, end, milliseconds(10));
100 * Test scheduling a timeout from another timeout callback.
102 BOOST_AUTO_TEST_CASE(CallbackSchedulingTimeout) {
103 TEventBase eventBase;
104 StackWheelTimer t(&eventBase, milliseconds(10));
105 const HHWheelTimer::Callback* nullCallback = nullptr;
108 // Delayed to simulate the steady_clock counter lagging
109 TestTimeoutDelayed t2;
111 t.scheduleTimeout(&t1, milliseconds(500));
112 t1.fn = [&] { t.scheduleTimeout(&t2, milliseconds(1)); };
113 // If t is in an inconsistent state, detachEventBase should fail.
114 t2.fn = [&] { t.detachEventBase(); };
116 BOOST_REQUIRE_EQUAL(t.count(), 1);
120 BOOST_REQUIRE_EQUAL(t.count(), 0);
121 BOOST_REQUIRE_EQUAL(t1.timestamps.size(), 1);
122 BOOST_REQUIRE_EQUAL(t2.timestamps.size(), 1);
126 * Test cancelling a timeout when it is scheduled to be fired right away.
129 TEST(HHWheelTimerTest, CancelTimeout) {
131 StackWheelTimer t(&eventBase, milliseconds(1));
133 // Create several timeouts that will all fire in 5ms.
134 TestTimeout t5_1(&t, milliseconds(5));
135 TestTimeout t5_2(&t, milliseconds(5));
136 TestTimeout t5_3(&t, milliseconds(5));
137 TestTimeout t5_4(&t, milliseconds(5));
138 TestTimeout t5_5(&t, milliseconds(5));
140 // Also create a few timeouts to fire in 10ms
141 TestTimeout t10_1(&t, milliseconds(10));
142 TestTimeout t10_2(&t, milliseconds(10));
143 TestTimeout t10_3(&t, milliseconds(10));
145 TestTimeout t20_1(&t, milliseconds(20));
146 TestTimeout t20_2(&t, milliseconds(20));
148 // Have t5_1 cancel t5_2 and t5_4.
150 // Cancelling t5_2 will test cancelling a timeout that is at the head of the
151 // list and ready to be fired.
153 // Cancelling t5_4 will test cancelling a timeout in the middle of the list
155 t5_2.cancelTimeout();
156 t5_4.cancelTimeout();
159 // Have t5_3 cancel t5_5.
160 // This will test cancelling the last remaining timeout.
162 // Then have t5_3 reschedule itself.
164 t5_5.cancelTimeout();
165 // Reset our function so we won't continually reschedule ourself
166 std::function<void()> fnDtorGuard;
167 t5_3.fn.swap(fnDtorGuard);
168 t.scheduleTimeout(&t5_3, milliseconds(5));
170 // Also test cancelling timeouts in another timeset that isn't ready to
173 // Cancel the middle timeout in ts10.
174 t10_2.cancelTimeout();
175 // Cancel both the timeouts in ts20.
176 t20_1.cancelTimeout();
177 t20_2.cancelTimeout();
184 ASSERT_EQ(t5_1.timestamps.size(), 1);
185 T_CHECK_TIMEOUT(start, t5_1.timestamps[0], milliseconds(5));
187 ASSERT_EQ(t5_3.timestamps.size(), 2);
188 T_CHECK_TIMEOUT(start, t5_3.timestamps[0], milliseconds(5));
189 T_CHECK_TIMEOUT(t5_3.timestamps[0], t5_3.timestamps[1], milliseconds(5));
191 ASSERT_EQ(t10_1.timestamps.size(), 1);
192 T_CHECK_TIMEOUT(start, t10_1.timestamps[0], milliseconds(10));
193 ASSERT_EQ(t10_3.timestamps.size(), 1);
194 T_CHECK_TIMEOUT(start, t10_3.timestamps[0], milliseconds(10));
196 // Cancelled timeouts
197 ASSERT_EQ(t5_2.timestamps.size(), 0);
198 ASSERT_EQ(t5_4.timestamps.size(), 0);
199 ASSERT_EQ(t5_5.timestamps.size(), 0);
200 ASSERT_EQ(t10_2.timestamps.size(), 0);
201 ASSERT_EQ(t20_1.timestamps.size(), 0);
202 ASSERT_EQ(t20_2.timestamps.size(), 0);
204 T_CHECK_TIMEOUT(start, end, milliseconds(10));
208 * Test destroying a HHWheelTimer with timeouts outstanding
211 TEST(HHWheelTimerTest, DestroyTimeoutSet) {
214 HHWheelTimer::UniquePtr t(
215 new HHWheelTimer(&eventBase, milliseconds(1)));
217 TestTimeout t5_1(t.get(), milliseconds(5));
218 TestTimeout t5_2(t.get(), milliseconds(5));
219 TestTimeout t5_3(t.get(), milliseconds(5));
221 TestTimeout t10_1(t.get(), milliseconds(10));
222 TestTimeout t10_2(t.get(), milliseconds(10));
224 // Have t5_2 destroy t
225 // Note that this will call destroy() inside t's timeoutExpired()
228 t5_3.cancelTimeout();
229 t5_1.cancelTimeout();
230 t10_1.cancelTimeout();
231 t10_2.cancelTimeout();
238 ASSERT_EQ(t5_1.timestamps.size(), 1);
239 T_CHECK_TIMEOUT(start, t5_1.timestamps[0], milliseconds(5));
240 ASSERT_EQ(t5_2.timestamps.size(), 1);
241 T_CHECK_TIMEOUT(start, t5_2.timestamps[0], milliseconds(5));
243 ASSERT_EQ(t5_3.timestamps.size(), 0);
244 ASSERT_EQ(t10_1.timestamps.size(), 0);
245 ASSERT_EQ(t10_2.timestamps.size(), 0);
247 T_CHECK_TIMEOUT(start, end, milliseconds(5));
251 * Test the tick interval parameter
253 TEST(HHWheelTimerTest, AtMostEveryN) {
256 // Create a timeout set with a 10ms interval, to fire no more than once
258 milliseconds interval(25);
259 milliseconds atMostEveryN(6);
260 StackWheelTimer t(&eventBase, atMostEveryN);
261 t.setCatchupEveryN(70);
263 // Create 60 timeouts to be added to ts10 at 1ms intervals.
264 uint32_t numTimeouts = 60;
265 std::vector<TestTimeout> timeouts(numTimeouts);
267 // Create a scheduler timeout to add the timeouts 1ms apart.
269 StackWheelTimer ts1(&eventBase, milliseconds(1));
270 TestTimeout scheduler(&ts1, milliseconds(1));
272 if (index >= numTimeouts) {
275 // Call timeoutExpired() on the timeout so it will record a timestamp.
276 // This is done only so we can record when we scheduled the timeout.
277 // This way if ts1 starts to fall behind a little over time we will still
278 // be comparing the ts10 timeouts to when they were first scheduled (rather
279 // than when we intended to schedule them). The scheduler may fall behind
280 // eventually since we don't really schedule it once every millisecond.
281 // Each time it finishes we schedule it for 1 millisecond in the future.
282 // The amount of time it takes to run, and any delays it encounters
283 // getting scheduled may eventually add up over time.
284 timeouts[index].timeoutExpired();
286 // Schedule the new timeout
287 t.scheduleTimeout(&timeouts[index], interval);
288 // Reschedule ourself
289 ts1.scheduleTimeout(&scheduler, milliseconds(1));
293 // Go ahead and schedule the first timeout now.
300 // We scheduled timeouts 1ms apart, when the HHWheelTimer is only allowed
301 // to wake up at most once every 3ms. It will therefore wake up every 3ms
302 // and fire groups of approximately 3 timeouts at a time.
304 // This is "approximately 3" since it may get slightly behind and fire 4 in
305 // one interval, etc. T_CHECK_TIMEOUT normally allows a few milliseconds of
306 // tolerance. We have to add the same into our checking algorithm here.
307 for (uint32_t idx = 0; idx < numTimeouts; ++idx) {
308 ASSERT_EQ(timeouts[idx].timestamps.size(), 2);
310 TimePoint scheduledTime(timeouts[idx].timestamps[0]);
311 TimePoint firedTime(timeouts[idx].timestamps[1]);
313 // Assert that the timeout fired at roughly the right time.
314 // T_CHECK_TIMEOUT() normally has a tolerance of 5ms. Allow an additional
316 milliseconds tolerance = milliseconds(5) + interval;
317 T_CHECK_TIMEOUT(scheduledTime, firedTime, atMostEveryN, tolerance);
319 // Assert that the difference between the previous timeout and now was
320 // either very small (fired in the same event loop), or larger than
326 TimePoint prev(timeouts[idx - 1].timestamps[1]);
328 auto delta = (firedTime.getTimeStart() - prev.getTimeEnd()) -
329 (firedTime.getTimeWaiting() - prev.getTimeWaiting());
330 if (delta > milliseconds(1)) {
331 T_CHECK_TIMEOUT(prev, firedTime, atMostEveryN);
337 * Test an event loop that is blocking
340 TEST(HHWheelTimerTest, SlowLoop) {
342 StackWheelTimer t(&eventBase, milliseconds(1));
347 ASSERT_EQ(t.count(), 0);
349 eventBase.runInLoop([](){usleep(10000);});
350 t.scheduleTimeout(&t1, milliseconds(5));
352 ASSERT_EQ(t.count(), 1);
358 ASSERT_EQ(t1.timestamps.size(), 1);
359 ASSERT_EQ(t.count(), 0);
361 // Check that the timeout was delayed by sleep
362 T_CHECK_TIMEOUT(start, t1.timestamps[0], milliseconds(15), milliseconds(1));
363 T_CHECK_TIMEOUT(start, end, milliseconds(15), milliseconds(1));
365 // Try it again, this time with catchup timing every loop
366 t.setCatchupEveryN(1);
368 eventBase.runInLoop([](){usleep(10000);});
369 t.scheduleTimeout(&t2, milliseconds(5));
371 ASSERT_EQ(t.count(), 1);
377 ASSERT_EQ(t2.timestamps.size(), 1);
378 ASSERT_EQ(t.count(), 0);
380 // Check that the timeout was NOT delayed by sleep
381 T_CHECK_TIMEOUT(start2, t2.timestamps[0], milliseconds(10), milliseconds(1));
382 T_CHECK_TIMEOUT(start2, end2, milliseconds(10), milliseconds(1));