fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.0 KiB
87 lines
3.0 KiB
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
#pragma once
|
|
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
#include <string>
|
|
#include <unordered_set>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#ifdef NDEBUG
|
|
#define TEST_SYNC_POINT(x)
|
|
#else
|
|
|
|
namespace rocksdb {
|
|
|
|
// This class provides facility to reproduce race conditions deterministically
|
|
// in unit tests.
|
|
// Developer could specify sync points in the codebase via TEST_SYNC_POINT.
|
|
// Each sync point represents a position in the execution stream of a thread.
|
|
// In the unit test, 'Happens After' relationship among sync points could be
|
|
// setup via SyncPoint::LoadDependency, to reproduce a desired interleave of
|
|
// threads execution.
|
|
// Refer to (DBTest,TransactionLogIteratorRace), for an exmaple use case.
|
|
|
|
class SyncPoint {
|
|
public:
|
|
static SyncPoint* GetInstance();
|
|
|
|
struct Dependency {
|
|
std::string predecessor;
|
|
std::string successor;
|
|
};
|
|
// call once at the beginning of a test to setup the dependency between
|
|
// sync points
|
|
void LoadDependency(const std::vector<Dependency>& dependencies);
|
|
|
|
// Set up a call back function in sync point.
|
|
void SetCallBack(const std::string point, std::function<void()> callback);
|
|
// Clear all call back functions.
|
|
void ClearAllCallBacks();
|
|
|
|
// enable sync point processing (disabled on startup)
|
|
void EnableProcessing();
|
|
|
|
// disable sync point processing
|
|
void DisableProcessing();
|
|
|
|
// remove the execution trace of all sync points
|
|
void ClearTrace();
|
|
|
|
// triggered by TEST_SYNC_POINT, blocking execution until all predecessors
|
|
// are executed.
|
|
void Process(const std::string& point);
|
|
|
|
// TODO: it might be useful to provide a function that blocks until all
|
|
// sync points are cleared.
|
|
|
|
private:
|
|
bool PredecessorsAllCleared(const std::string& point);
|
|
|
|
// successor/predecessor map loaded from LoadDependency
|
|
std::unordered_map<std::string, std::vector<std::string>> successors_;
|
|
std::unordered_map<std::string, std::vector<std::string>> predecessors_;
|
|
std::unordered_map<std::string, std::function<void()> > callbacks_;
|
|
|
|
std::mutex mutex_;
|
|
std::condition_variable cv_;
|
|
// sync points that have been passed through
|
|
std::unordered_set<std::string> cleared_points_;
|
|
bool enabled_ = false;
|
|
int num_callbacks_running_ = 0;
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
|
|
// Use TEST_SYNC_POINT to specify sync points inside code base.
|
|
// Sync points can have happens-after depedency on other sync points,
|
|
// configured at runtime via SyncPoint::LoadDependency. This could be
|
|
// utilized to re-produce race conditions between threads.
|
|
// See TransactionLogIteratorRace in db_test.cc for an example use case.
|
|
// TEST_SYNC_POINT is no op in release build.
|
|
#define TEST_SYNC_POINT(x) rocksdb::SyncPoint::GetInstance()->Process(x)
|
|
#endif // NDEBUG
|
|
|