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85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/*******************************************************************************
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* $Id: we_getfilesizes.h 4450 2013-04-15 14:13:24Z chao $
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*
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*******************************************************************************/
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#ifndef WE_GETFILESIZES_H__
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#define WE_GETFILESIZES_H__
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#include <unistd.h>
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#include <string>
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#include "bytestream.h"
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#include "atomicops.h"
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namespace WriteEngine
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{
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/** @brief Get all file sizes for the given table
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*/
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class WE_GetFileSizes
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{
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public:
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static int processTable(messageqcpp::ByteStream& bs, std::string& errMsg, int key);
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static int processFileName(messageqcpp::ByteStream& bs, std::string& errMsg, int key);
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};
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class ActiveThreadCounter
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{
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public:
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ActiveThreadCounter(int size) : factiveThreadCount(size) {}
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virtual ~ActiveThreadCounter() {}
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void decr()
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{
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int atc;
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for (;;)
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{
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atomicops::atomicMb();
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atc = factiveThreadCount;
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if (atc <= 0) //hopefully atc will never be < 0!
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return;
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if (atomicops::atomicCAS(&factiveThreadCount, atc, (atc - 1)))
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return;
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atomicops::atomicYield();
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}
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}
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uint32_t cur()
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{
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return factiveThreadCount;
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}
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private:
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ActiveThreadCounter(const ActiveThreadCounter& rhs);
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ActiveThreadCounter& operator=(const ActiveThreadCounter& rhs);
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volatile int32_t factiveThreadCount;
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};
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}
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#endif
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