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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
+
+#include <string>
+#include <stdint.h>
+#ifdef SNAPPY
+#include <snappy.h>
+#endif
+
+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
+ // we use opaque void * to avoid including windows.h in port_win.h
+ void * cs_;
+
+ // 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 Andrew D. Birrell in 2003
+class CondVar {
+ public:
+ explicit CondVar(Mutex* mu);
+ ~CondVar();
+ void Wait();
+ void Signal();
+ void SignalAll();
+ private:
+ Mutex* mu_;
+
+ Mutex wait_mtx_;
+ long waiting_;
+
+ void * sem1_;
+ void * sem2_;
+
+
+};
+
+class OnceType {
+public:
+// OnceType() : init_(false) {}
+ OnceType(const OnceType &once) : init_(once.init_) {}
+ OnceType(bool f) : init_(f) {}
+ void InitOnce(void (*initializer)()) {
+ mutex_.Lock();
+ if (!init_) {
+ init_ = true;
+ initializer();
+ }
+ mutex_.Unlock();
+ }
+
+private:
+ bool init_;
+ Mutex mutex_;
+};
+
+#define LEVELDB_ONCE_INIT false
+extern void InitOnce(port::OnceType*, void (*initializer)());
+
+// Storage for a lock-free pointer
+class AtomicPointer {
+ private:
+ void * rep_;
+ public:
+ AtomicPointer() : rep_(NULL) { }
+ explicit AtomicPointer(void* v);
+ void* Acquire_Load() const;
+
+ void Release_Store(void* v);
+
+ void* NoBarrier_Load() const;
+
+ void NoBarrier_Store(void* v);
+};
+
+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_