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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/* GLOBAL FUNCTIONS:
** DESCRIPTION:
** PR Atomic operations
*/
#ifndef pratom_h___
#define pratom_h___
#include "prtypes.h"
#include "prlock.h"
PR_BEGIN_EXTERN_C
/*
** FUNCTION: PR_AtomicIncrement
** DESCRIPTION:
** Atomically increment a 32 bit value.
** INPUTS:
** val: a pointer to the value to increment
** RETURN:
** the returned value is the result of the increment
*/
NSPR_API(PRInt32) PR_AtomicIncrement(PRInt32 *val);
/*
** FUNCTION: PR_AtomicDecrement
** DESCRIPTION:
** Atomically decrement a 32 bit value.
** INPUTS:
** val: a pointer to the value to decrement
** RETURN:
** the returned value is the result of the decrement
*/
NSPR_API(PRInt32) PR_AtomicDecrement(PRInt32 *val);
/*
** FUNCTION: PR_AtomicSet
** DESCRIPTION:
** Atomically set a 32 bit value.
** INPUTS:
** val: A pointer to a 32 bit value to be set
** newval: The newvalue to assign to val
** RETURN:
** Returns the prior value
*/
NSPR_API(PRInt32) PR_AtomicSet(PRInt32 *val, PRInt32 newval);
/*
** FUNCTION: PR_AtomicAdd
** DESCRIPTION:
** Atomically add a 32 bit value.
** INPUTS:
** ptr: a pointer to the value to increment
** val: value to be added
** RETURN:
** the returned value is the result of the addition
*/
NSPR_API(PRInt32) PR_AtomicAdd(PRInt32 *ptr, PRInt32 val);
/*
** LIFO linked-list (stack)
*/
typedef struct PRStackElemStr PRStackElem;
struct PRStackElemStr {
PRStackElem *prstk_elem_next; /* next pointer MUST be at offset 0;
assembly language code relies on this */
};
typedef struct PRStackStr PRStack;
/*
** FUNCTION: PR_CreateStack
** DESCRIPTION:
** Create a stack, a LIFO linked list
** INPUTS:
** stack_name: a pointer to string containing the name of the stack
** RETURN:
** A pointer to the created stack, if successful, else NULL.
*/
NSPR_API(PRStack *) PR_CreateStack(const char *stack_name);
/*
** FUNCTION: PR_StackPush
** DESCRIPTION:
** Push an element on the top of the stack
** INPUTS:
** stack: pointer to the stack
** stack_elem: pointer to the stack element
** RETURN:
** None
*/
NSPR_API(void) PR_StackPush(PRStack *stack, PRStackElem *stack_elem);
/*
** FUNCTION: PR_StackPop
** DESCRIPTION:
** Remove the element on the top of the stack
** INPUTS:
** stack: pointer to the stack
** RETURN:
** A pointer to the stack element removed from the top of the stack,
** if non-empty,
** else NULL
*/
NSPR_API(PRStackElem *) PR_StackPop(PRStack *stack);
/*
** FUNCTION: PR_DestroyStack
** DESCRIPTION:
** Destroy the stack
** INPUTS:
** stack: pointer to the stack
** RETURN:
** PR_SUCCESS - if successfully deleted
** PR_FAILURE - if the stack is not empty
** PR_GetError will return
** PR_INVALID_STATE_ERROR - stack is not empty
*/
NSPR_API(PRStatus) PR_DestroyStack(PRStack *stack);
PR_END_EXTERN_C
#endif /* pratom_h___ */
|
