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
|
/*
* ptw32_InterlockedCompareExchange.c
*
* Description:
* This translation unit implements routines which are private to
* the implementation and may be used throughout it.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2003 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; 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 2 of the License, or (at your option) any later version.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* ptw32_InterlockedCompareExchange --
*
* Needed because W95 doesn't support InterlockedCompareExchange.
* It is only used when running the dll on W95. Other versions of
* Windows use the Win32 supported version, which may be running on
* different processor types.
*
* This can't be inlined because we need to know it's address so that
* we can call it through a pointer.
*/
PTW32_INTERLOCKED_LONG WINAPI
ptw32_InterlockedCompareExchange (PTW32_INTERLOCKED_LPLONG location,
PTW32_INTERLOCKED_LONG value,
PTW32_INTERLOCKED_LONG comparand)
{
#if defined(__WATCOMC__)
/* Don't report that result is not assigned a value before being referenced */
#pragma disable_message (200)
#endif
PTW32_INTERLOCKED_LONG result;
/* *INDENT-OFF* */
#if defined(_M_IX86) || defined(_X86_)
#if defined(_MSC_VER) || defined(__WATCOMC__)
_asm {
PUSH ecx
PUSH edx
MOV ecx,dword ptr [location]
MOV edx,dword ptr [value]
MOV eax,dword ptr [comparand]
LOCK CMPXCHG dword ptr [ecx],edx ; if (EAX == [ECX]),
; [ECX] = EDX
; else
; EAX = [ECX]
MOV dword ptr [result], eax
POP edx
POP ecx
}
#elif defined(__GNUC__)
__asm__
(
"lock\n\t"
"cmpxchgl %3,(%0)" /* if (EAX == [location]), */
/* [location] = value */
/* else */
/* EAX = [location] */
:"=r" (location), "=a" (result)
:"0" (location), "q" (value), "a" (comparand)
: "memory" );
#endif
#else
/*
* If execution gets to here then we should be running on a Win95 system
* but either running on something other than an X86 processor, or a
* compiler other than MSVC or GCC. Pthreads-win32 doesn't support that
* platform (yet).
*/
result = 0;
#endif
/* *INDENT-ON* */
return result;
#if defined(__WATCOMC__)
#pragma enable_message (200)
#endif
}
|
