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construct/ircd/db_port.h

87 lines
2.2 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_DB_PORT_H
// !!! EXPERIMENTAL !!!
//
// This file is special; even within the context of embedding RocksDB through
// its env interface. The functionality provided here is NOT done via
// overriding virtual interfaces called by RocksDB like with the rest of env.
// This functionality is deemed too critical for runtime virtual interfaces.
//
// Instead, the definitions we provide override those that RocksDB uses at
// link-time during the compilation of libircd. Interface declarations are not
// provided by RocksDB in its include path either, thus our interface here must
// match the rocksdb::port interface.
//
// Unfortunately if the rocksdb::port interface partially changes and we leave
// unresolved symbols at link time that may be bad, and go silently unnoticed.
//
// !!! EXPERIMENTAL !!!
namespace rocksdb::port
{
using namespace ircd;
struct Mutex;
struct CondVar;
struct RWMutex;
}
class rocksdb::port::Mutex
{
friend class CondVar;
ctx::mutex mu;
public:
void Lock() noexcept;
void Unlock() noexcept;
void AssertHeld() noexcept;
Mutex() noexcept;
Mutex(bool adaptive) noexcept;
Mutex(const Mutex &) = delete;
Mutex &operator=(const Mutex &) = delete;
~Mutex() noexcept;
};
class rocksdb::port::CondVar
{
Mutex *mu;
ctx::condition_variable cv;
public:
void Wait() noexcept;
bool TimedWait(uint64_t abs_time_us) noexcept; // Returns true if timeout occurred
void Signal() noexcept;
void SignalAll() noexcept;
CondVar(Mutex *mu) noexcept;
~CondVar() noexcept;
};
class rocksdb::port::RWMutex
{
ctx::shared_mutex mu;
public:
void ReadLock() noexcept;
void WriteLock() noexcept;
void ReadUnlock() noexcept;
void WriteUnlock() noexcept;
RWMutex() noexcept;
RWMutex(const RWMutex &) = delete;
RWMutex &operator=(const RWMutex &) = delete;
~RWMutex() noexcept;
};