/usr/include/CGAL/RS/ugcd/pagealloc.h is in libcgal-dev 4.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | // Copyright (c) 2007 Inria Lorraine (France). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
// Author: Luis Peñaranda <luis.penaranda@gmx.com>
#ifndef CGAL_RS__PAGEALLOC_H
#define CGAL_RS__PAGEALLOC_H
#include <cstdlib>
#include <cstring>
namespace CGAL{
namespace RS_MGCD{
#define CGALRS_PAGESIZE 4194304
#define CGALRS_TABLESIZE 2048
#define CGALRS_PAGES 8
#define CGALRS_VOIDSCAST unsigned long
struct pinfo{
void *start;
size_t size;
};
CGALRS_THREAD_ATTR void** pages_startptr;
CGALRS_THREAD_ATTR size_t pages_max;//=CGALRS_PAGES;
CGALRS_THREAD_ATTR size_t pages_allocated;
CGALRS_THREAD_ATTR size_t pages_current;
CGALRS_THREAD_ATTR size_t page_remainingbytes;
CGALRS_THREAD_ATTR void* page_currentptr;
CGALRS_THREAD_ATTR struct pinfo *nodes_allocated;
CGALRS_THREAD_ATTR size_t nodes_total;
CGALRS_THREAD_ATTR size_t nodes_assigned;
class Page_alloc{
protected:
static
void* meminit(){
pages_startptr=(void**)malloc(CGALRS_PAGES*sizeof(void*));
pages_startptr[0]=malloc(CGALRS_PAGESIZE);
pages_allocated=1;
pages_current=0;
page_remainingbytes=CGALRS_PAGESIZE;
page_currentptr=pages_startptr[0];
nodes_total=CGALRS_TABLESIZE;
nodes_allocated=
(struct pinfo*)malloc(CGALRS_TABLESIZE*sizeof(struct pinfo));
nodes_assigned=0;
return page_currentptr;
};
static
void* newpage(){
void *r;
if(pages_allocated>pages_current+1){
++pages_current;
r=pages_startptr[pages_current];
page_currentptr=r;
page_remainingbytes=CGALRS_PAGESIZE;
return r;
}
// iso c++ forbids to initialize a static member (pages_max),
// so we have to start using pages_max when the amount of
// allocated pages reaches the value CGALRS_PAGES (this is not of
// course the cleanest way to do it)
if(pages_allocated==CGALRS_PAGES)
pages_max=2*CGALRS_PAGES;
else
pages_max=0;
if(pages_allocated==pages_max){
pages_max*=2;
pages_startptr=
(void**)realloc(pages_startptr,pages_max*sizeof(void*));
}
r=malloc(CGALRS_PAGESIZE);
pages_startptr[pages_allocated]=r;
page_currentptr=r;
++pages_allocated;
page_remainingbytes=CGALRS_PAGESIZE;
return r;
};
// if they ask us to allocate a memory size bigger than the page,
// we are lost (we could in that case make a bigger page)
static
void* palloc(size_t size){
void* r;
if(size>page_remainingbytes){
newpage();
return palloc(size);
}
if(nodes_assigned==nodes_total){
nodes_total*=2;
nodes_allocated=(struct pinfo*)realloc
(nodes_allocated,nodes_total*sizeof(struct pinfo));
}
page_remainingbytes-=size;
r=page_currentptr;
page_currentptr=(void*)((CGALRS_VOIDSCAST)page_currentptr+size);
// c++ does not support nodes_allocated[nodes_assigned]={r,s}
nodes_allocated[nodes_assigned].start=r;
nodes_allocated[nodes_assigned].size=size;
++nodes_assigned;
return r;
};
static
void* prealloc(void *ptr,size_t size){
void *dest;
size_t i=0;
while(nodes_allocated[i].start!=ptr)
++i;
if(nodes_allocated[i].size<size){
dest=palloc(size);
nodes_allocated[i].start=dest;
nodes_allocated[i].size=size;
return memcpy(dest,ptr,nodes_allocated[i].size);
}
return ptr;
};
#define CGALRS_PFREE(X) {}
//void CGALRS_PFREE(void* ptr){
// size_t i=0;
// while(nodes_allocated[i].start!=ptr)
// ++i;
// nodes_allocated[i].start=0;
// return;
//};
static
void* memclear(){
pages_current=0;
page_remainingbytes=CGALRS_PAGESIZE;
page_currentptr=pages_startptr[0];
nodes_assigned=0;
return page_currentptr;
}
static
void memrelease(){
size_t i;
for(i=0;i<pages_allocated;++i)
free(pages_startptr[i]);
return;
};
}; // class Page_alloc
} // namespace RS_MGCD
} // namespace CGAL
#endif // CGAL_RS__PAGEALLOC_H
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