91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: Allocator.h /main/1 1996/07/29 16:46:04 cde-hp $ */
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// Copyright (c) 1994 James Clark
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// See the file COPYING for copying permission.
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#ifndef Allocator_INCLUDED
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#define Allocator_INCLUDED 1
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#include <stddef.h>
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class SP_API Allocator {
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public:
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Allocator(size_t maxSize, unsigned blocksPerSegment);
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~Allocator();
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void *alloc(size_t);
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static void *allocSimple(size_t);
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static void free(void *);
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// It would be nice to make these private, but some compilers have problems.
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union ForceAlign {
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unsigned long n;
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struct SP_API {
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char c;
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} s;
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char *cp;
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long *lp;
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};
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struct SegmentHeader;
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union BlockHeader;
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friend union BlockHeader;
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union BlockHeader {
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SegmentHeader *seg;
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ForceAlign align;
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};
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struct Block;
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friend struct Block;
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struct SP_API Block {
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BlockHeader header;
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Block *next;
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};
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friend struct SegmentHeader;
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struct SP_API SegmentHeader {
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union {
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Block **freeList;
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ForceAlign align;
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};
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unsigned liveCount;
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SegmentHeader *next;
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};
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private:
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Allocator(const Allocator &); // undefined
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Allocator &operator=(const Allocator &); // undefined
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Block *freeList_;
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size_t objectSize_;
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unsigned blocksPerSegment_;
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SegmentHeader *segments_;
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void *alloc1();
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void tooBig(size_t);
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};
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* not Allocator_INCLUDED */
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