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// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// See port_example.h for documentation for the following types/functions.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the University of California, Berkeley nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#ifndef STORAGE_LEVELDB_PORT_PORT_WIN_H_
#define STORAGE_LEVELDB_PORT_PORT_WIN_H_
#ifdef _MSC_VER
#define snprintf _snprintf
#define close _close
#define fread_unlocked _fread_nolock
#endif
#ifdef SNAPPY
#include <snappy/snappy.h>
#endif
#include <string>
#include <stdint.h>
namespace leveldb {
namespace port {
// Windows is little endian (for now :p)
static const bool kLittleEndian = true;
class CondVar;
class Mutex {
public:
Mutex();
~Mutex();
void Lock();
void Unlock();
void AssertHeld();
private:
friend class CondVar;
// critical sections are more efficient than mutexes
// but they are not recursive and can only be used to synchronize threads within the same process
// additionnaly they cannot be used with SignalObjectAndWait that we use for CondVar
// we use opaque void * to avoid including windows.h in port_win.h
void * mutex_;
// No copying
Mutex(const Mutex&);
void operator=(const Mutex&);
};
// the Win32 API offers a dependable condition variable mechanism, but only starting with
// Windows 2008 and Vista
// no matter what we will implement our own condition variable with a semaphore
// implementation as described in a paper written by Douglas C. Schmidt and Irfan Pyarali
class CondVar {
public:
explicit CondVar(Mutex* mu);
~CondVar();
void Wait();
void Signal();
void SignalAll();
private:
Mutex* mu_;
Mutex wait_mtx_;
long waiting_;
void * sema_;
void * event_;
bool broadcasted_;
};
// Storage for a lock-free pointer
class AtomicPointer {
private:
void * rep_;
public:
AtomicPointer() : rep_(nullptr) { }
explicit AtomicPointer(void* v);
void* Acquire_Load() const;
void Release_Store(void* v);
void* NoBarrier_Load() const;
void NoBarrier_Store(void* v);
};
typedef volatile long OnceType;
#define LEVELDB_ONCE_INIT (0)
extern void InitOnce(OnceType* once, void (*initializer)());
inline bool Snappy_Compress(const char* input, size_t length,
::std::string* output) {
#ifdef SNAPPY
output->resize(snappy::MaxCompressedLength(length));
size_t outlen;
snappy::RawCompress(input, length, &(*output)[0], &outlen);
output->resize(outlen);
return true;
#endif
return false;
}
inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
size_t* result) {
#ifdef SNAPPY
return snappy::GetUncompressedLength(input, length, result);
#else
return false;
#endif
}
inline bool Snappy_Uncompress(const char* input, size_t length,
char* output) {
#ifdef SNAPPY
return snappy::RawUncompress(input, length, output);
#else
return false;
#endif
}
inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
return false;
}
}
}
#endif // STORAGE_LEVELDB_PORT_PORT_WIN_H_
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