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-rw-r--r--src/leveldb/port/port.h2
-rw-r--r--src/leveldb/port/port_win.cc182
-rw-r--r--src/leveldb/port/port_win.h161
3 files changed, 345 insertions, 0 deletions
diff --git a/src/leveldb/port/port.h b/src/leveldb/port/port.h
index e667db40d0..4baafa8e22 100644
--- a/src/leveldb/port/port.h
+++ b/src/leveldb/port/port.h
@@ -14,6 +14,8 @@
# include "port/port_posix.h"
#elif defined(LEVELDB_PLATFORM_CHROMIUM)
# include "port/port_chromium.h"
+#elif defined(LEVELDB_PLATFORM_WINDOWS)
+# include "port/port_win.h"
#endif
#endif // STORAGE_LEVELDB_PORT_PORT_H_
diff --git a/src/leveldb/port/port_win.cc b/src/leveldb/port/port_win.cc
new file mode 100644
index 0000000000..4ca64acbef
--- /dev/null
+++ b/src/leveldb/port/port_win.cc
@@ -0,0 +1,182 @@
+// 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.
+//
+
+#include "port/port_win.h"
+
+#include <windows.h>
+#include <cassert>
+
+namespace leveldb {
+namespace port {
+
+Mutex::Mutex() :
+ mutex_(::CreateMutex(NULL, FALSE, NULL)) {
+ assert(mutex_);
+}
+
+Mutex::~Mutex() {
+ assert(mutex_);
+ ::CloseHandle(mutex_);
+}
+
+void Mutex::Lock() {
+ assert(mutex_);
+ ::WaitForSingleObject(mutex_, INFINITE);
+}
+
+void Mutex::Unlock() {
+ assert(mutex_);
+ ::ReleaseMutex(mutex_);
+}
+
+void Mutex::AssertHeld() {
+ assert(mutex_);
+ assert(1);
+}
+
+CondVar::CondVar(Mutex* mu) :
+ waiting_(0),
+ mu_(mu),
+ sema_(::CreateSemaphore(NULL, 0, 0x7fffffff, NULL)),
+ event_(::CreateEvent(NULL, FALSE, FALSE, NULL)),
+ broadcasted_(false){
+ assert(mu_);
+}
+
+CondVar::~CondVar() {
+ ::CloseHandle(sema_);
+ ::CloseHandle(event_);
+}
+
+void CondVar::Wait() {
+ wait_mtx_.Lock();
+ ++waiting_;
+ assert(waiting_ > 0);
+ wait_mtx_.Unlock();
+
+ ::SignalObjectAndWait(mu_->mutex_, sema_, INFINITE, FALSE);
+
+ wait_mtx_.Lock();
+ bool last = broadcasted_ && (--waiting_ == 0);
+ assert(waiting_ >= 0);
+ wait_mtx_.Unlock();
+
+ // we leave this function with the mutex held
+ if (last)
+ {
+ ::SignalObjectAndWait(event_, mu_->mutex_, INFINITE, FALSE);
+ }
+ else
+ {
+ ::WaitForSingleObject(mu_->mutex_, INFINITE);
+ }
+}
+
+void CondVar::Signal() {
+ wait_mtx_.Lock();
+ bool waiters = waiting_ > 0;
+ wait_mtx_.Unlock();
+
+ if (waiters)
+ {
+ ::ReleaseSemaphore(sema_, 1, 0);
+ }
+}
+
+void CondVar::SignalAll() {
+ wait_mtx_.Lock();
+
+ broadcasted_ = (waiting_ > 0);
+
+ if (broadcasted_)
+ {
+ // release all
+ ::ReleaseSemaphore(sema_, waiting_, 0);
+ wait_mtx_.Unlock();
+ ::WaitForSingleObject(event_, INFINITE);
+ broadcasted_ = false;
+ }
+ else
+ {
+ wait_mtx_.Unlock();
+ }
+}
+
+AtomicPointer::AtomicPointer(void* v) {
+ Release_Store(v);
+}
+
+void* AtomicPointer::Acquire_Load() const {
+ void * p = nullptr;
+ InterlockedExchangePointer(&p, rep_);
+ return p;
+}
+
+void AtomicPointer::Release_Store(void* v) {
+ InterlockedExchangePointer(&rep_, v);
+}
+
+void* AtomicPointer::NoBarrier_Load() const {
+ return rep_;
+}
+
+void AtomicPointer::NoBarrier_Store(void* v) {
+ rep_ = v;
+}
+
+enum InitializationState
+{
+ Uninitialized = 0,
+ Running = 1,
+ Initialized = 2
+};
+
+void InitOnce(OnceType* once, void (*initializer)()) {
+
+ static_assert(Uninitialized == LEVELDB_ONCE_INIT, "Invalid uninitialized state value");
+
+ InitializationState state = static_cast<InitializationState>(InterlockedCompareExchange(once, Running, Uninitialized));
+
+ if (state == Uninitialized) {
+ initializer();
+ *once = Initialized;
+ }
+
+ if (state == Running) {
+ while(*once != Initialized) {
+ Sleep(0); // yield
+ }
+ }
+
+ assert(*once == Initialized);
+}
+
+}
+}
diff --git a/src/leveldb/port/port_win.h b/src/leveldb/port/port_win.h
new file mode 100644
index 0000000000..b53d6ef70d
--- /dev/null
+++ b/src/leveldb/port/port_win.h
@@ -0,0 +1,161 @@
+// 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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