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
|
/*
This file is part of the KDE libraries
Copyright (C) 2004 Jaroslaw Staniek <js@iidea.pl>
These sources are based on ftp://g.oswego.edu/pub/misc/malloc.c
file by Doug Lea, released to the public domain.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <sys/mman.h>
#include <assert.h>
//#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define MORECORE_FAILURE ((void*)(-1))
#define MUNMAP_FAILURE (-1)
#define USE_MALLOC_LOCK 1
/* Wait for spin lock */
static int slwait (int *sl) {
#ifdef KDEWIN32_9x
/* TODO */
#else
while (InterlockedCompareExchange ((LONG volatile*) sl, (LONG) 1, (LONG) 0) != 0)
Sleep (0);
#endif
return 0;
}
/* Release spin lock */
static int slrelease (int *sl) {
InterlockedExchange (sl, 0);
return 0;
}
/* getpagesize for windows */
static long getpagesize (void)
{
static long g_pagesize = 0;
if (! g_pagesize) {
SYSTEM_INFO system_info;
GetSystemInfo (&system_info);
g_pagesize = system_info.dwPageSize;
}
return g_pagesize;
}
/* Spin lock for emulation code */
static int g_sl;
static long getregionsize (void)
{
static long g_regionsize = 0;
if (! g_regionsize) {
SYSTEM_INFO system_info;
GetSystemInfo (&system_info);
g_regionsize = system_info.dwAllocationGranularity;
}
return g_regionsize;
}
//static void *mmap (void *ptr, long size, long prot, long type, long handle, long arg) {
KDEWIN32_EXPORT void * mmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
{
static long g_pagesize;
static long g_regionsize;
#ifdef TRACE
printf ("mmap %d\n", length);
#endif
#if defined (USE_MALLOC_LOCK)
/* Wait for spin lock */
slwait (&g_sl);
#endif
/* First time initialization */
if (! g_pagesize)
g_pagesize = getpagesize ();
if (! g_regionsize)
g_regionsize = getregionsize ();
/* Assert preconditions */
assert ((unsigned) start % g_regionsize == 0);
assert (length % g_pagesize == 0);
/* Allocate this */
start = VirtualAlloc (start, length,
MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE);
if (! start) {
start = (void *) MORECORE_FAILURE;
goto mmap_exit;
}
/* Assert postconditions */
assert ((unsigned) start % g_regionsize == 0);
#ifdef TRACE
printf ("Commit %p %d\n", start, length);
#endif
mmap_exit:
#if defined (USE_MALLOC_LOCK)
/* Release spin lock */
slrelease (&g_sl);
#endif
return start;
}
//static long munmap (void *ptr, long size) {
KDEWIN32_EXPORT int munmap(void *start, size_t length)
{
static long g_pagesize;
static long g_regionsize;
int rc = MUNMAP_FAILURE;
#ifdef TRACE
printf ("munmap %p %d\n", start, length);
#endif
#if defined (USE_MALLOC_LOCK)
/* Wait for spin lock */
slwait (&g_sl);
#endif
/* First time initialization */
if (! g_pagesize)
g_pagesize = getpagesize ();
if (! g_regionsize)
g_regionsize = getregionsize ();
/* Assert preconditions */
assert ((unsigned) start % g_regionsize == 0);
assert (length % g_pagesize == 0);
/* Free this */
if (! VirtualFree (start, 0,
MEM_RELEASE))
goto munmap_exit;
rc = 0;
#ifdef TRACE
printf ("Release %p %d\n", start, length);
#endif
munmap_exit:
#if defined (USE_MALLOC_LOCK)
/* Release spin lock */
slrelease (&g_sl);
#endif
return rc;
}
|
