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
|
/*
* TAP-Win32 -- A kernel driver to provide virtual tap device
* functionality on Windows. Originally derived
* from the CIPE-Win32 project by Damion K. Wilson,
* with extensive modifications by James Yonan.
*
* All source code which derives from the CIPE-Win32 project is
* Copyright (C) Damion K. Wilson, 2003, and is released under the
* GPL version 2 (see below).
*
* All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
* and is released under the GPL version 2 (see below).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
typedef struct
{
volatile long count;
} MUTEX;
#define MUTEX_SLEEP_TIME 10000 // microseconds
#define INIT_MUTEX(m) { (m)->count = 0; }
#define ACQUIRE_MUTEX_BLOCKING(m) \
{ \
while (NdisInterlockedIncrement (&((m)->count)) != 1) \
{ \
NdisInterlockedDecrement(&((m)->count)); \
NdisMSleep(MUTEX_SLEEP_TIME); \
} \
}
#define RELEASE_MUTEX(m) \
{ \
NdisInterlockedDecrement(&((m)->count)); \
}
#define ACQUIRE_MUTEX_NONBLOCKING(m, result) \
{ \
if (NdisInterlockedIncrement (&((m)->count)) != 1) \
{ \
NdisInterlockedDecrement(&((m)->count)); \
result = FALSE; \
} \
else \
{ \
result = TRUE; \
} \
}
#define ACQUIRE_MUTEX_ADAPTIVE(m, result) \
{ \
result = TRUE; \
while (NdisInterlockedIncrement (&((m)->count)) != 1) \
{ \
NdisInterlockedDecrement(&((m)->count)); \
if (KeGetCurrentIrql () < DISPATCH_LEVEL) \
NdisMSleep(MUTEX_SLEEP_TIME); \
else \
{ \
result = FALSE; \
break; \
} \
} \
}
|
