tomFlowee
c63519fa47
The leveldb and univalue 3rd party libraries are not installed and not needed by anyone outside of the Hub. So move them there, making it easier for 3rd party usage.
148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// See port_example.h for documentation for the following types/functions.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the University of California, Berkeley nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#include "port/port_win.h"
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#include <windows.h>
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#include <cassert>
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namespace leveldb {
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namespace port {
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Mutex::Mutex() :
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cs_(NULL) {
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assert(!cs_);
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cs_ = static_cast<void *>(new CRITICAL_SECTION());
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::InitializeCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
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assert(cs_);
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}
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Mutex::~Mutex() {
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assert(cs_);
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::DeleteCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
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delete static_cast<CRITICAL_SECTION *>(cs_);
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cs_ = NULL;
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assert(!cs_);
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}
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void Mutex::Lock() {
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assert(cs_);
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::EnterCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
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}
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void Mutex::Unlock() {
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assert(cs_);
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::LeaveCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
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}
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void Mutex::AssertHeld() {
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assert(cs_);
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assert(1);
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}
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CondVar::CondVar(Mutex* mu) :
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waiting_(0),
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mu_(mu),
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sem1_(::CreateSemaphore(NULL, 0, 10000, NULL)),
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sem2_(::CreateSemaphore(NULL, 0, 10000, NULL)) {
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assert(mu_);
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}
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CondVar::~CondVar() {
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::CloseHandle(sem1_);
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::CloseHandle(sem2_);
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}
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void CondVar::Wait() {
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mu_->AssertHeld();
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wait_mtx_.Lock();
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++waiting_;
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wait_mtx_.Unlock();
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mu_->Unlock();
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// initiate handshake
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::WaitForSingleObject(sem1_, INFINITE);
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::ReleaseSemaphore(sem2_, 1, NULL);
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mu_->Lock();
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}
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void CondVar::Signal() {
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wait_mtx_.Lock();
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if (waiting_ > 0) {
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--waiting_;
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// finalize handshake
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::ReleaseSemaphore(sem1_, 1, NULL);
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::WaitForSingleObject(sem2_, INFINITE);
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}
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wait_mtx_.Unlock();
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}
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void CondVar::SignalAll() {
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wait_mtx_.Lock();
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::ReleaseSemaphore(sem1_, waiting_, NULL);
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while(waiting_ > 0) {
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--waiting_;
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::WaitForSingleObject(sem2_, INFINITE);
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}
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wait_mtx_.Unlock();
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}
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AtomicPointer::AtomicPointer(void* v) {
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Release_Store(v);
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}
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void InitOnce(OnceType* once, void (*initializer)()) {
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once->InitOnce(initializer);
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}
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void* AtomicPointer::Acquire_Load() const {
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void * p = NULL;
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InterlockedExchangePointer(&p, rep_);
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return p;
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}
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void AtomicPointer::Release_Store(void* v) {
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InterlockedExchangePointer(&rep_, v);
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}
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void* AtomicPointer::NoBarrier_Load() const {
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return rep_;
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}
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void AtomicPointer::NoBarrier_Store(void* v) {
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rep_ = v;
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}
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}
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}
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