From 94a50fb339d72f64721b75b66fdfe28b1633fbdc Mon Sep 17 00:00:00 2001
From: justmoon <justmoon@members.fsf.org>
Date: Sat, 21 Jul 2012 14:54:55 +0200
Subject: Leveldb Windows port by Edouard Alligand, adapted for MingW by me.

---
 src/leveldb/port/port_win.cc | 182 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 src/leveldb/port/port_win.cc

(limited to 'src/leveldb/port/port_win.cc')

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);
+}
+
+}
+}
-- 
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