mirror of https://github.com/facebook/rocksdb.git
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <atomic>
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#include "rocksdb/env.h"
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namespace ROCKSDB_NAMESPACE {
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// NOTE: SpecialEnv offers most of this functionality, along with hooks
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// for safe DB behavior under a mock time environment, so should be used
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// instead of MockTimeEnv for DB tests.
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class MockTimeEnv : public EnvWrapper {
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public:
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explicit MockTimeEnv(Env* base) : EnvWrapper(base) {}
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virtual Status GetCurrentTime(int64_t* time_sec) override {
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assert(time_sec != nullptr);
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*time_sec = static_cast<int64_t>(current_time_us_ / kMicrosInSecond);
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return Status::OK();
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}
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virtual uint64_t NowSeconds() { return current_time_us_ / kMicrosInSecond; }
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virtual uint64_t NowMicros() override { return current_time_us_; }
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virtual uint64_t NowNanos() override {
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assert(current_time_us_ <= std::numeric_limits<uint64_t>::max() / 1000);
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return current_time_us_ * 1000;
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}
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uint64_t RealNowMicros() { return target()->NowMicros(); }
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void set_current_time(uint64_t time_sec) {
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assert(time_sec < std::numeric_limits<uint64_t>::max() / kMicrosInSecond);
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assert(time_sec * kMicrosInSecond >= current_time_us_);
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current_time_us_ = time_sec * kMicrosInSecond;
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}
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// It's a fake sleep that just updates the Env current time, which is similar
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// to `NoSleepEnv.SleepForMicroseconds()` and
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// `SpecialEnv.MockSleepForMicroseconds()`.
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// It's also similar to `set_current_time()`, which takes an absolute time in
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// seconds, vs. this one takes the sleep in microseconds.
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// Note: Not thread safe.
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void MockSleepForMicroseconds(int micros) {
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assert(micros >= 0);
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assert(current_time_us_ + static_cast<uint64_t>(micros) >=
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current_time_us_);
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current_time_us_.fetch_add(micros);
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}
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void MockSleepForSeconds(int seconds) {
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assert(seconds >= 0);
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uint64_t micros = static_cast<uint64_t>(seconds) * kMicrosInSecond;
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assert(current_time_us_ + micros >= current_time_us_);
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current_time_us_.fetch_add(micros);
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}
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// TODO: this is a workaround for the different behavior on different platform
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// for timedwait timeout. Ideally timedwait API should be moved to env.
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// details: PR #7101.
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void InstallTimedWaitFixCallback();
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private:
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std::atomic<uint64_t> current_time_us_{0};
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static constexpr uint64_t kMicrosInSecond = 1000U * 1000U;
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};
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} // namespace ROCKSDB_NAMESPACE
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