source: trunk/src/kernel32/interlock.asm@ 3363

Last change on this file since 3363 was 2090, checked in by sandervl, 26 years ago

InterlockedExchange again
File size: 3.7 KB
Line 
1; $Id: interlock.asm,v 1.7 1999-12-16 00:59:21 sandervl Exp $
2
3;/*
4; * Interlocked apis
5; *
6; * Copyright 1999 Sander van Leeuwen
7; * Copyright 1999 Patrick Haller
8; *
9; * Based on WINE code: win32\thread.c (990815)
10; *
11; * Copyright 1995 Martin von Loewis
12; * Copyright 1997 Onno Hovers
13; *
14; * Project Odin Software License can be found in LICENSE.TXT
15; *
16; */
17.586P
18 NAME interlocked
19
20CODE32 SEGMENT DWORD PUBLIC USE32 'CODE'
21
22 public _InterlockedIncrement@4
23
24;* InterlockedIncrement [KERNEL32] *
25;* *
26;* InterlockedIncrement adds 1 to a long variable and returns *
27;* - a negative number if the result < 0 *
28;* - zero if the result == 0 *
29;* - a positive number if the result > 0 *
30;* *
31;* The returned number need not be equal to the result!!!! *
32
33_InterlockedIncrement@4 proc near
34 mov eax, dword ptr [esp+4] ; LPLONG lpAddend
35 lock inc dword ptr [eax]
36 mov eax, 0
37 je @end ; not incremented?
38 jl @decr
39 inc eax ; ?
40 jmp @end
41@decr: dec eax ; ?
42@end: ret 4
43_InterlockedIncrement@4 endp
44
45 public _InterlockedDecrement@4
46
47;* InterlockedDecrement [KERNEL32] *
48;* *
49;* InterlockedIncrement adds 1 to a long variable and returns *
50;* - a negative number if the result < 0 *
51;* - zero if the result == 0 *
52;* - a positive number if the result > 0 *
53;* *
54;* The returned number need not be equal to the result!!!! *
55
56_InterlockedDecrement@4 proc near
57 mov eax, dword ptr [esp+4] ; LPLONG lpAddend
58 lock dec dword ptr [eax]
59 mov eax, 0
60 je @end ; not decremented?
61 jl @decr
62 inc eax ; ?
63 jmp @end
64@decr: dec eax ; ?
65@end: ret 4
66_InterlockedDecrement@4 endp
67
68
69 public _InterlockedExchange@8
70; * InterlockedExchange [KERNEL32.???]
71; *
72; * Atomically exchanges a pair of values.
73; *
74; * RETURNS
75; * Prior value of value pointed to by Target
76
77_InterlockedExchange@8 proc near
78 push edx
79 mov eax, [esp+12] ; LONG value
80 mov edx,[esp+8] ; LPLONG target
81 lock xchg eax, dword ptr [edx]
82 pop edx
83 ret 8
84_InterlockedExchange@8 endp
85
86
87
88 public _InterlockedCompareExchange@12
89;/************************************************************************
90; * InterlockedCompareExchange [KERNEL32.879]
91; *
92; * Atomically compares Destination and Comperand, and if found equal exchanges
93; * the value of Destination with Exchange
94; *
95; * RETURNS
96; * Prior value of value pointed to by Destination
97; */
98_InterlockedCompareExchange@12 proc near
99 push ebp
100 mov ebp, esp
101 push edx
102 push ebx
103
104 mov ebx, dword ptr [ebp+8] ;PVOID *Destination, /* Address of 32-bit value to exchange */
105 push dword ptr [ebx] ;save old *Destination
106 mov eax, [ebp+16] ;PVOID Comperand /* value to compare, 32 bits */
107 mov edx, [ebp+12] ;PVOID Exchange, /* change value, 32 bits */
108 lock cmpxchg dword ptr [ebx],edx
109 pop eax
110
111 pop ebx
112 pop edx
113 pop ebp
114 ret 12
115_InterlockedCompareExchange@12 endp
116
117 public _InterlockedExchangeAdd@8
118; * InterlockedExchangeAdd [KERNEL32.880]
119; *
120; * Atomically adds Increment to Addend and returns the previous value of
121; * Addend
122; *
123; * RETURNS
124; * Prior value of value pointed to by cwAddendTarget
125; */
126_InterlockedExchangeAdd@8 proc near
127 push edx
128 mov eax, dword ptr [esp+12] ;LONG Increment /* Value to add */
129 mov edx, dword ptr [esp+8] ;PLONG Addend, /* Address of 32-bit value to exchange */
130 lock xadd dword ptr [edx], eax
131 pop edx
132 ret 8
133_InterlockedExchangeAdd@8 endp
134
135CODE32 ENDS
136
137 END
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