mirror of https://github.com/facebook/rocksdb.git
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
// 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).
|
|
|
|
#pragma once
|
|
|
|
#include <atomic>
|
|
#include <limits>
|
|
|
|
#include "rocksdb/system_clock.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
// NOTE: SpecialEnv offers most of this functionality, along with hooks
|
|
// for safe DB behavior under a mock time environment, so should be used
|
|
// instead of MockSystemClock for DB tests.
|
|
class MockSystemClock : public SystemClockWrapper {
|
|
public:
|
|
explicit MockSystemClock(const std::shared_ptr<SystemClock>& base)
|
|
: SystemClockWrapper(base) {}
|
|
|
|
static const char* kClassName() { return "MockSystemClock"; }
|
|
const char* Name() const override { return kClassName(); }
|
|
virtual Status GetCurrentTime(int64_t* time_sec) override {
|
|
assert(time_sec != nullptr);
|
|
*time_sec = static_cast<int64_t>(current_time_us_ / kMicrosInSecond);
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual uint64_t NowSeconds() { return current_time_us_ / kMicrosInSecond; }
|
|
|
|
virtual uint64_t NowMicros() override { return current_time_us_; }
|
|
|
|
virtual uint64_t NowNanos() override {
|
|
assert(current_time_us_ <= std::numeric_limits<uint64_t>::max() / 1000);
|
|
return current_time_us_ * 1000;
|
|
}
|
|
|
|
uint64_t RealNowMicros() { return target_->NowMicros(); }
|
|
|
|
void SetCurrentTime(uint64_t time_sec) {
|
|
assert(time_sec < std::numeric_limits<uint64_t>::max() / kMicrosInSecond);
|
|
assert(time_sec * kMicrosInSecond >= current_time_us_);
|
|
current_time_us_ = time_sec * kMicrosInSecond;
|
|
}
|
|
|
|
// It's a fake sleep that just updates the Env current time, which is similar
|
|
// to `NoSleepEnv.SleepForMicroseconds()` and
|
|
// `SpecialEnv.MockSleepForMicroseconds()`.
|
|
// It's also similar to `set_current_time()`, which takes an absolute time in
|
|
// seconds, vs. this one takes the sleep in microseconds.
|
|
// Note: Not thread safe.
|
|
void SleepForMicroseconds(int micros) override {
|
|
assert(micros >= 0);
|
|
assert(current_time_us_ + static_cast<uint64_t>(micros) >=
|
|
current_time_us_);
|
|
current_time_us_.fetch_add(micros);
|
|
}
|
|
|
|
void MockSleepForSeconds(int seconds) {
|
|
assert(seconds >= 0);
|
|
int micros = seconds * kMicrosInSecond;
|
|
SleepForMicroseconds(micros);
|
|
}
|
|
|
|
// TODO: this is a workaround for the different behavior on different platform
|
|
// for timedwait timeout. Ideally timedwait API should be moved to env.
|
|
// details: PR #7101.
|
|
void InstallTimedWaitFixCallback();
|
|
|
|
private:
|
|
std::atomic<uint64_t> current_time_us_{0};
|
|
static constexpr uint64_t kMicrosInSecond = 1000U * 1000U;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|