urbackup_backend/fileservplugin/bufmgr.cpp
2021-06-20 20:58:50 +02:00

85 lines
2.0 KiB
C++

/*************************************************************************
* UrBackup - Client/Server backup system
* Copyright (C) 2011-2016 Martin Raiber
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/
#include "../vld.h"
#include "bufmgr.h"
#include "log.h"
#ifdef _WIN32
#include <Windows.h>
#endif
namespace fileserv
{
CBufMgr::CBufMgr(unsigned int nbuf, unsigned int bsize)
{
for(unsigned int i=0;i<nbuf;++i)
{
char* buffer;
#ifndef _WIN32
buffer=new char[bsize];
#else
buffer = reinterpret_cast<char*>(VirtualAlloc(NULL, bsize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
#endif
buffers.push_back( buffer );
free_buffers.push(buffer);
}
}
CBufMgr::~CBufMgr(void)
{
if (free_buffers.size() != buffers.size())
{
Log("There are used buffers when freeing buffer manager", LL_ERROR);
}
for(size_t i=0;i<buffers.size();++i)
{
#ifndef _WIN32
delete[] buffers[i];
#else
VirtualFree(buffers[i], 0, MEM_RELEASE);
#endif
}
}
char* CBufMgr::getBuffer(void)
{
if (!free_buffers.empty())
{
char* buffer = free_buffers.top();
free_buffers.pop();
return buffer;
}
else
{
return nullptr;
}
}
void CBufMgr::releaseBuffer(char* buf)
{
free_buffers.push(buf);
}
unsigned int CBufMgr::nfreeBufffer(void)
{
return static_cast<unsigned int>(free_buffers.size());
}
} //namespace fileserv