95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
/*
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* Copyright (C) 2006-2016 Jacek Sieka, arnetheduck on gmail point com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef ADCHPP_POOL_H
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#define ADCHPP_POOL_H
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#include "Mutex.h"
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namespace adchpp {
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template<class T>
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struct PoolDummy {
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void operator()(T&) { }
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};
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template<typename T, class Clear = PoolDummy<T> >
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class SimplePool {
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public:
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SimplePool() : busy(0) { }
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~SimplePool() { dcdebug("Busy pool objects: %d\n", (int)busy); }
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T* get() {
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busy++;
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if(!free.empty()) {
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T* tmp = free.back();
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free.pop_back();
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return tmp;
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} else {
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return new T;
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}
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}
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void put(T* item) {
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dcassert(busy > 0);
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busy--;
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Clear()(*item);
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// Remove some objects every now and then...
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if(free.size() > (2*busy) && free.size() > 32) {
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dcdebug("Clearing pool\n");
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while(free.size() > busy / 2) {
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delete free.back();
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free.pop_back();
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}
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}
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free.push_back(item);
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}
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private:
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size_t busy;
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std::vector<T*> free;
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};
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/** A thread safe object pool */
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template<class T, class Clear = PoolDummy<T> >
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class Pool {
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public:
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Pool() { }
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~Pool() { }
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T* get() {
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FastMutex::Lock l(mtx);
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return pool.get();
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}
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void put(T* obj) {
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FastMutex::Lock l(mtx);
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pool.put(obj);
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}
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private:
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Pool(const Pool&);
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Pool& operator=(const Pool&);
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FastMutex mtx;
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SimplePool<T, Clear> pool;
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};
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}
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#endif //POOL_H_
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