/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <unistd.h>
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#include <utils/SystemClock.h>
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#include <gtest/gtest.h>
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static const auto MS_IN_NS = 1000000;
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static const int64_t SLEEP_MS = 500;
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static const int64_t SLEEP_NS = SLEEP_MS * MS_IN_NS;
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// Conservatively assume that we might be descheduled for up to 50 ms
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static const int64_t SLACK_MS = 50;
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static const int64_t SLACK_NS = SLACK_MS * MS_IN_NS;
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TEST(SystemClock, SystemClock) {
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auto startUptimeMs = android::uptimeMillis();
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auto startRealtimeMs = android::elapsedRealtime();
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auto startRealtimeNs = android::elapsedRealtimeNano();
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ASSERT_GT(startUptimeMs, 0)
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<< "uptimeMillis() reported an impossible uptime";
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ASSERT_GE(startRealtimeMs, startUptimeMs)
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<< "elapsedRealtime() thinks we've suspended for negative time";
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ASSERT_GE(startRealtimeNs, startUptimeMs * MS_IN_NS)
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<< "elapsedRealtimeNano() thinks we've suspended for negative time";
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ASSERT_GE(startRealtimeNs, startRealtimeMs * MS_IN_NS)
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<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent";
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ASSERT_LT(startRealtimeNs, (startRealtimeMs + SLACK_MS) * MS_IN_NS)
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<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent";
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timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = SLEEP_MS * MS_IN_NS;
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auto nanosleepErr = TEMP_FAILURE_RETRY(nanosleep(&ts, nullptr));
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ASSERT_EQ(nanosleepErr, 0) << "nanosleep() failed: " << strerror(errno);
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auto endUptimeMs = android::uptimeMillis();
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auto endRealtimeMs = android::elapsedRealtime();
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auto endRealtimeNs = android::elapsedRealtimeNano();
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EXPECT_GE(endUptimeMs - startUptimeMs, SLEEP_MS)
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<< "uptimeMillis() advanced too little after nanosleep()";
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EXPECT_LT(endUptimeMs - startUptimeMs, SLEEP_MS + SLACK_MS)
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<< "uptimeMillis() advanced too much after nanosleep()";
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EXPECT_GE(endRealtimeMs - startRealtimeMs, SLEEP_MS)
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<< "elapsedRealtime() advanced too little after nanosleep()";
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EXPECT_LT(endRealtimeMs - startRealtimeMs, SLEEP_MS + SLACK_MS)
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<< "elapsedRealtime() advanced too much after nanosleep()";
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EXPECT_GE(endRealtimeNs - startRealtimeNs, SLEEP_NS)
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<< "elapsedRealtimeNano() advanced too little after nanosleep()";
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EXPECT_LT(endRealtimeNs - startRealtimeNs, SLEEP_NS + SLACK_NS)
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<< "elapsedRealtimeNano() advanced too much after nanosleep()";
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EXPECT_GE(endRealtimeNs, endRealtimeMs * MS_IN_NS)
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<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent after nanosleep()";
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EXPECT_LT(endRealtimeNs, (endRealtimeMs + SLACK_MS) * MS_IN_NS)
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<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent after nanosleep()";
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}
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