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Side by Side Diff: nspr/pr/include/pratom.h

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /* GLOBAL FUNCTIONS:
7 ** DESCRIPTION:
8 ** PR Atomic operations
9 */
10
11 #ifndef pratom_h___
12 #define pratom_h___
13
14 #include "prtypes.h"
15 #include "prlock.h"
16
17 PR_BEGIN_EXTERN_C
18
19 /*
20 ** FUNCTION: PR_AtomicIncrement
21 ** DESCRIPTION:
22 ** Atomically increment a 32 bit value.
23 ** INPUTS:
24 ** val: a pointer to the value to increment
25 ** RETURN:
26 ** the returned value is the result of the increment
27 */
28 NSPR_API(PRInt32) PR_AtomicIncrement(PRInt32 *val);
29
30 /*
31 ** FUNCTION: PR_AtomicDecrement
32 ** DESCRIPTION:
33 ** Atomically decrement a 32 bit value.
34 ** INPUTS:
35 ** val: a pointer to the value to decrement
36 ** RETURN:
37 ** the returned value is the result of the decrement
38 */
39 NSPR_API(PRInt32) PR_AtomicDecrement(PRInt32 *val);
40
41 /*
42 ** FUNCTION: PR_AtomicSet
43 ** DESCRIPTION:
44 ** Atomically set a 32 bit value.
45 ** INPUTS:
46 ** val: A pointer to a 32 bit value to be set
47 ** newval: The newvalue to assign to val
48 ** RETURN:
49 ** Returns the prior value
50 */
51 NSPR_API(PRInt32) PR_AtomicSet(PRInt32 *val, PRInt32 newval);
52
53 /*
54 ** FUNCTION: PR_AtomicAdd
55 ** DESCRIPTION:
56 ** Atomically add a 32 bit value.
57 ** INPUTS:
58 ** ptr: a pointer to the value to increment
59 ** val: value to be added
60 ** RETURN:
61 ** the returned value is the result of the addition
62 */
63 NSPR_API(PRInt32) PR_AtomicAdd(PRInt32 *ptr, PRInt32 val);
64
65 /*
66 ** MACRO: PR_ATOMIC_INCREMENT
67 ** MACRO: PR_ATOMIC_DECREMENT
68 ** MACRO: PR_ATOMIC_SET
69 ** MACRO: PR_ATOMIC_ADD
70 ** DESCRIPTION:
71 ** Macro versions of the atomic operations. They may be implemented
72 ** as compiler intrinsics.
73 **
74 ** IMPORTANT NOTE TO NSPR MAINTAINERS:
75 ** Implement these macros with compiler intrinsics only on platforms
76 ** where the PR_AtomicXXX functions are truly atomic (i.e., where the
77 ** configuration macro _PR_HAVE_ATOMIC_OPS is defined). Otherwise,
78 ** the macros and functions won't be compatible and can't be used
79 ** interchangeably.
80 */
81 #if defined(_WIN32) && !defined(_WIN32_WCE) && \
82 (!defined(_MSC_VER) || (_MSC_VER >= 1310))
83
84 #include <intrin.h>
85
86 #ifdef _MSC_VER
87 #pragma intrinsic(_InterlockedIncrement)
88 #pragma intrinsic(_InterlockedDecrement)
89 #pragma intrinsic(_InterlockedExchange)
90 #pragma intrinsic(_InterlockedExchangeAdd)
91 #endif
92
93 #define PR_ATOMIC_INCREMENT(val) _InterlockedIncrement((long volatile *)(val))
94 #define PR_ATOMIC_DECREMENT(val) _InterlockedDecrement((long volatile *)(val))
95 #define PR_ATOMIC_SET(val, newval) \
96 _InterlockedExchange((long volatile *)(val), (long)(newval))
97 #define PR_ATOMIC_ADD(ptr, val) \
98 (_InterlockedExchangeAdd((long volatile *)(ptr), (long)(val)) + (val))
99
100 #elif ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && \
101 ((defined(__APPLE__) && \
102 (defined(__ppc__) || defined(__i386__) || defined(__x86_64__))) || \
103 (defined(__linux__) && \
104 ((defined(__i386__) && \
105 defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
106 defined(__ia64__) || defined(__x86_64__) || \
107 defined(__powerpc__) || \
108 (defined(__arm__) && \
109 defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
110 defined(__aarch64__) || defined(__alpha) || \
111 (defined(__mips__) && \
112 defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)))))
113
114 /*
115 * Because the GCC manual warns that some processors may support
116 * reduced functionality of __sync_lock_test_and_set, we test for the
117 * processors that we believe support a full atomic exchange operation.
118 */
119
120 #define PR_ATOMIC_INCREMENT(val) __sync_add_and_fetch(val, 1)
121 #define PR_ATOMIC_DECREMENT(val) __sync_sub_and_fetch(val, 1)
122 #define PR_ATOMIC_SET(val, newval) __sync_lock_test_and_set(val, newval)
123 #define PR_ATOMIC_ADD(ptr, val) __sync_add_and_fetch(ptr, val)
124
125 #else
126
127 #define PR_ATOMIC_INCREMENT(val) PR_AtomicIncrement(val)
128 #define PR_ATOMIC_DECREMENT(val) PR_AtomicDecrement(val)
129 #define PR_ATOMIC_SET(val, newval) PR_AtomicSet(val, newval)
130 #define PR_ATOMIC_ADD(ptr, val) PR_AtomicAdd(ptr, val)
131
132 #endif
133
134 /*
135 ** LIFO linked-list (stack)
136 */
137 typedef struct PRStackElemStr PRStackElem;
138
139 struct PRStackElemStr {
140 PRStackElem *prstk_elem_next; /* next pointer MUST be at offset 0;
141 assemb ly language code relies on this */
142 };
143
144 typedef struct PRStackStr PRStack;
145
146 /*
147 ** FUNCTION: PR_CreateStack
148 ** DESCRIPTION:
149 ** Create a stack, a LIFO linked list
150 ** INPUTS:
151 ** stack_name: a pointer to string containing the name of the stack
152 ** RETURN:
153 ** A pointer to the created stack, if successful, else NULL.
154 */
155 NSPR_API(PRStack *) PR_CreateStack(const char *stack_name);
156
157 /*
158 ** FUNCTION: PR_StackPush
159 ** DESCRIPTION:
160 ** Push an element on the top of the stack
161 ** INPUTS:
162 ** stack: pointer to the stack
163 ** stack_elem: pointer to the stack element
164 ** RETURN:
165 ** None
166 */
167 NSPR_API(void) PR_StackPush(PRStack *stack, PRStackElem *stack_ elem);
168
169 /*
170 ** FUNCTION: PR_StackPop
171 ** DESCRIPTION:
172 ** Remove the element on the top of the stack
173 ** INPUTS:
174 ** stack: pointer to the stack
175 ** RETURN:
176 ** A pointer to the stack element removed from the top of the stack,
177 ** if non-empty,
178 ** else NULL
179 */
180 NSPR_API(PRStackElem *) PR_StackPop(PRStack *stack);
181
182 /*
183 ** FUNCTION: PR_DestroyStack
184 ** DESCRIPTION:
185 ** Destroy the stack
186 ** INPUTS:
187 ** stack: pointer to the stack
188 ** RETURN:
189 ** PR_SUCCESS - if successfully deleted
190 ** PR_FAILURE - if the stack is not empty
191 ** PR_GetError will return
192 ** PR_INVALID_STATE_ERROR - stack i s not empty
193 */
194 NSPR_API(PRStatus) PR_DestroyStack(PRStack *stack);
195
196 PR_END_EXTERN_C
197
198 #endif /* pratom_h___ */
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