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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include <atomic>
#include <memory>
#include "db/db_test_util.h"
#include "util/repeatable_thread.h"
#include "util/sync_point.h"
#include "util/testharness.h"
class RepeatableThreadTest : public testing::Test {
public:
RepeatableThreadTest()
: mock_env_(new rocksdb::MockTimeEnv(rocksdb::Env::Default())) {}
protected:
std::unique_ptr<rocksdb::MockTimeEnv> mock_env_;
};
TEST_F(RepeatableThreadTest, TimedTest) {
constexpr uint64_t kSecond = 1000000; // 1s = 1000000us
constexpr int kIteration = 3;
rocksdb::Env* env = rocksdb::Env::Default();
rocksdb::port::Mutex mutex;
rocksdb::port::CondVar test_cv(&mutex);
int count = 0;
uint64_t prev_time = env->NowMicros();
rocksdb::RepeatableThread thread(
[&] {
rocksdb::MutexLock l(&mutex);
count++;
uint64_t now = env->NowMicros();
assert(count == 1 || prev_time + 1 * kSecond <= now);
prev_time = now;
if (count >= kIteration) {
test_cv.SignalAll();
}
},
"rt_test", env, 1 * kSecond);
// Wait for execution finish.
{
rocksdb::MutexLock l(&mutex);
while (count < kIteration) {
test_cv.Wait();
}
}
// Test cancel
thread.cancel();
}
TEST_F(RepeatableThreadTest, MockEnvTest) {
constexpr uint64_t kSecond = 1000000; // 1s = 1000000us
constexpr int kIteration = 3;
mock_env_->set_current_time(0); // in seconds
std::atomic<int> count{0};
#if defined(OS_MACOSX) && !defined(NDEBUG)
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"InstrumentedCondVar::TimedWaitInternal", [&](void* arg) {
// Obtain the current (real) time in seconds and add 1000 extra seconds
// to ensure that RepeatableThread::wait invokes TimedWait with a time
// greater than (real) current time. This is to prevent the TimedWait
// function from returning immediately without sleeping and releasing
// the mutex on certain platforms, e.g. OS X. If TimedWait returns
// immediately, the mutex will not be released, and
// RepeatableThread::TEST_WaitForRun never has a chance to execute the
// callback which, in this case, updates the result returned by
// mock_env->NowMicros. Consequently, RepeatableThread::wait cannot
// break out of the loop, causing test to hang. The extra 1000 seconds
// is a best-effort approach because there seems no reliable and
// deterministic way to provide the aforementioned guarantee. By the
// time RepeatableThread::wait is called, it is no guarantee that the
// delay + mock_env->NowMicros will be greater than the current real
// time. However, 1000 seconds should be sufficient in most cases.
uint64_t time_us = *reinterpret_cast<uint64_t*>(arg);
if (time_us < mock_env_->RealNowMicros()) {
*reinterpret_cast<uint64_t*>(arg) = mock_env_->RealNowMicros() + 1000;
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
#endif // OS_MACOSX && !NDEBUG
rocksdb::RepeatableThread thread([&] { count++; }, "rt_test", mock_env_.get(),
1 * kSecond, 1 * kSecond);
for (int i = 1; i <= kIteration; i++) {
// Bump current time
thread.TEST_WaitForRun([&] { mock_env_->set_current_time(i); });
}
// Test function should be exectued exactly kIteraion times.
ASSERT_EQ(kIteration, count.load());
// Test cancel
thread.cancel();
}
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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