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
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/***
*smalheap.c - small, simple heap manager
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*
*
*******************************************************************************/
#include <stdlib.h>
#include <malloc.h>
#include <windows.h>
#define BYTES_PER_PARA 16
#define DWORDS_PER_PARA 4
#define PARAS_PER_PAGE 256 // tunable value
#define PAGES_PER_GROUP 8 // tunable value
#define GROUPS_PER_REGION 32 // tunable value (max 32)
#define BYTES_PER_PAGE (BYTES_PER_PARA * PARAS_PER_PAGE)
#define BYTES_PER_GROUP (BYTES_PER_PAGE * PAGES_PER_GROUP)
#define BYTES_PER_REGION (BYTES_PER_GROUP * GROUPS_PER_REGION)
#ifdef __cplusplus
extern "C" {
#endif
HANDLE _crtheap;
/*
* Primary heap routines (Initialization, termination, malloc and free).
*/
void __cdecl free (
void * pblock
)
{
if ( pblock == NULL )
return;
HeapFree(_crtheap, 0, pblock);
}
int __cdecl _heap_init (
int mtflag
)
{
if ( (_crtheap = HeapCreate( mtflag ? 0 : HEAP_NO_SERIALIZE,
BYTES_PER_PAGE, 0 )) == NULL )
return 0;
return 1;
}
void __cdecl _heap_term (
void
)
{
HeapDestroy( _crtheap );
}
void * __cdecl _nh_malloc (
size_t size,
int nhFlag
)
{
void * retp;
retp = HeapAlloc( _crtheap, 0, size );
/*
* if successful allocation, return pointer to memory
* if new handling turned off altogether, return NULL
*/
return retp;
}
void * __cdecl malloc (
size_t size
)
{
return _nh_malloc( size, 0 );
}
/*
* Secondary heap routines.
*/
void * __cdecl calloc (
size_t num,
size_t size
)
{
void * retp;
size *= num;
retp = HeapAlloc( _crtheap, HEAP_ZERO_MEMORY, size );
return retp;
/* new handler was successful -- try to allocate again */
}
void * __cdecl _expand (
void * pblock,
size_t newsize
)
{
return HeapReAlloc( _crtheap,
HEAP_REALLOC_IN_PLACE_ONLY,
pblock,
newsize );
}
int __cdecl _heapchk(void)
{
int retcode = _HEAPOK;
if ( !HeapValidate( _crtheap, 0, NULL ) &&
(GetLastError() != ERROR_CALL_NOT_IMPLEMENTED) )
retcode = _HEAPBADNODE;
return retcode;
}
int __cdecl _heapmin(void)
{
if ( (HeapCompact( _crtheap, 0 ) == 0) &&
(GetLastError() != ERROR_CALL_NOT_IMPLEMENTED) )
return -1;
return 0;
}
size_t __cdecl _msize (
void * pblock
)
{
return (size_t)HeapSize( _crtheap, 0, pblock );
}
void * __cdecl realloc (
void * pblock,
size_t newsize
)
{
void * retp;
/* if pblock is NULL, call malloc */
if ( pblock == (void *) NULL )
return malloc( newsize );
/* if pblock is !NULL and size is 0, call free and return NULL */
if ( newsize == 0 ) {
free( pblock );
return NULL;
}
retp = HeapReAlloc( _crtheap, 0, pblock, newsize );
return retp;
}
#ifdef __cplusplus
}
#endif
|
