Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/misc/pratom.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 ** PR Atomic operations
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8 */
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9
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10
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11 #include "pratom.h"
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12 #include "primpl.h"
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13
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14 #include <string.h>
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15
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16 /*
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17 * The following is a fallback implementation that emulates
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18 * atomic operations for platforms without atomic operations.
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19 * If a platform has atomic operations, it should define the
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20 * macro _PR_HAVE_ATOMIC_OPS, and the following will not be
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21 * compiled in.
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22 */
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23
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24 #if !defined(_PR_HAVE_ATOMIC_OPS)
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25
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26 #if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
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27 /*
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28 * PR_AtomicDecrement() is used in NSPR's thread-specific data
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29 * destructor. Because thread-specific data destructors may be
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30 * invoked after a PR_Cleanup() call, we need an implementation
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31 * of the atomic routines that doesn't need NSPR to be initialized.
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32 */
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33
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34 /*
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35 * We use a set of locks for all the emulated atomic operations.
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36 * By hashing on the address of the integer to be locked the
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37 * contention between multiple threads should be lessened.
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38 *
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39 * The number of atomic locks can be set by the environment variable
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40 * NSPR_ATOMIC_HASH_LOCKS
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41 */
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42
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43 /*
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44 * lock counts should be a power of 2
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45 */
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46 #define DEFAULT_ATOMIC_LOCKS 16 /* should be in sync with the number of initializers
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47 below */
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48 #define MAX_ATOMIC_LOCKS (4 * 1024)
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49
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50 static pthread_mutex_t static_atomic_locks[DEFAULT_ATOMIC_LOCKS] = {
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51 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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52 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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53 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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54 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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55 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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56 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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57 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
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58 PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER };
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59
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60 #ifdef DEBUG
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61 static PRInt32 static_hash_lock_counts[DEFAULT_ATOMIC_LOCKS];
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62 static PRInt32 *hash_lock_counts = static_hash_lock_counts;
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63 #endif
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64
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65 static PRUint32 num_atomic_locks = DEFAULT_ATOMIC_LOCKS;
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66 static pthread_mutex_t *atomic_locks = static_atomic_locks;
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67 static PRUint32 atomic_hash_mask = DEFAULT_ATOMIC_LOCKS - 1;
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68
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69 #define _PR_HASH_FOR_LOCK(ptr) \
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70 ((PRUint32) (((PRUptrdiff) (ptr) >> 2) ^ \
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71 ((PRUptrdiff) (ptr) >> 8)) & \
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72 atomic_hash_mask)
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73
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74 void _PR_MD_INIT_ATOMIC()
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75 {
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76 char *eval;
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77 int index;
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78
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79
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80 PR_ASSERT(PR_FloorLog2(MAX_ATOMIC_LOCKS) ==
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81 PR_CeilingLog2(MAX_ATOMIC_LOCKS));
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82
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83 PR_ASSERT(PR_FloorLog2(DEFAULT_ATOMIC_LOCKS) ==
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84 PR_CeilingLog2(DEFAULT_ATOMIC_LOCKS));
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85
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86 if (((eval = getenv("NSPR_ATOMIC_HASH_LOCKS")) != NULL) &&
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87 ((num_atomic_locks = atoi(eval)) != DEFAULT_ATOMIC_LOCKS)) {
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88
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89 if (num_atomic_locks > MAX_ATOMIC_LOCKS)
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90 num_atomic_locks = MAX_ATOMIC_LOCKS;
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91 else if (num_atomic_locks < 1)
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92 num_atomic_locks = 1;
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93 else {
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94 num_atomic_locks = PR_FloorLog2(num_atomic_locks);
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95 num_atomic_locks = 1L << num_atomic_locks;
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96 }
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97 atomic_locks = (pthread_mutex_t *) PR_Malloc(sizeof(pthread_mutex_t) *
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98 num_atomic_locks);
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99 if (atomic_locks) {
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100 for (index = 0; index < num_atomic_locks; index++) {
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101 if (pthread_mutex_init(&atomic_locks[index], NULL)) {
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102 PR_DELETE(atomic_locks);
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103 atomic_locks = NULL;
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104 break;
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105 }
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106 }
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107 }
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108 #ifdef DEBUG
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109 if (atomic_locks) {
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110 hash_lock_counts = PR_CALLOC(num_atomic_locks * sizeof(PRInt32));
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111 if (hash_lock_counts == NULL) {
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112 PR_DELETE(atomic_locks);
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113 atomic_locks = NULL;
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114 }
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115 }
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116 #endif
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117 if (atomic_locks == NULL) {
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118 /*
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119 * Use statically allocated locks
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120 */
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121 atomic_locks = static_atomic_locks;
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122 num_atomic_locks = DEFAULT_ATOMIC_LOCKS;
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123 #ifdef DEBUG
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124 hash_lock_counts = static_hash_lock_counts;
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125 #endif
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126 }
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127 atomic_hash_mask = num_atomic_locks - 1;
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128 }
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parents:
diff changeset
129 PR_ASSERT(PR_FloorLog2(num_atomic_locks) ==
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
130 PR_CeilingLog2(num_atomic_locks));
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
131 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
132
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
133 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
134 _PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
135 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 PRInt32 idx = _PR_HASH_FOR_LOCK(val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
138
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
139 pthread_mutex_lock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140 rv = ++(*val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 #ifdef DEBUG
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
142 hash_lock_counts[idx]++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
144 pthread_mutex_unlock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
145 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
146 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
147
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
148 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
149 _PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
152 PRInt32 idx = _PR_HASH_FOR_LOCK(ptr);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
153
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
154 pthread_mutex_lock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
155 rv = ((*ptr) += val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
156 #ifdef DEBUG
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
157 hash_lock_counts[idx]++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
159 pthread_mutex_unlock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
163 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 _PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
165 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
166 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
167 PRInt32 idx = _PR_HASH_FOR_LOCK(val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
168
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
169 pthread_mutex_lock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
170 rv = --(*val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
171 #ifdef DEBUG
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
172 hash_lock_counts[idx]++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
173 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
174 pthread_mutex_unlock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
176 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
178 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
179 _PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
181 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
182 PRInt32 idx = _PR_HASH_FOR_LOCK(val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
183
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
184 pthread_mutex_lock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
185 rv = *val;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 *val = newval;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187 #ifdef DEBUG
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 hash_lock_counts[idx]++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
190 pthread_mutex_unlock(&atomic_locks[idx]);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
191 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
192 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
193 #else /* _PR_PTHREADS && !_PR_DCETHREADS */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
194 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
195 * We use a single lock for all the emulated atomic operations.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
196 * The lock contention should be acceptable.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
197 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
198 static PRLock *atomic_lock = NULL;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
199 void _PR_MD_INIT_ATOMIC(void)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
200 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
201 if (atomic_lock == NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
202 atomic_lock = PR_NewLock();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
203 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
204 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
205
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
206 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
207 _PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
208 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
209 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
210
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
211 if (!_pr_initialized) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
212 _PR_ImplicitInitialization();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
213 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
214 PR_Lock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
215 rv = ++(*val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
216 PR_Unlock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
217 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
218 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
219
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
220 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
221 _PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
222 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
223 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
224
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
225 if (!_pr_initialized) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
226 _PR_ImplicitInitialization();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
227 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
228 PR_Lock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
229 rv = ((*ptr) += val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
230 PR_Unlock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
231 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
232 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
233
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
234 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
235 _PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
236 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
237 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
238
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
239 if (!_pr_initialized) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
240 _PR_ImplicitInitialization();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
241 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
242 PR_Lock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
243 rv = --(*val);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
244 PR_Unlock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
245 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
246 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
247
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
248 PRInt32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
249 _PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
250 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
251 PRInt32 rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
252
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
253 if (!_pr_initialized) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
254 _PR_ImplicitInitialization();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
255 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
256 PR_Lock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
257 rv = *val;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
258 *val = newval;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
259 PR_Unlock(atomic_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
260 return rv;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 #endif /* _PR_PTHREADS && !_PR_DCETHREADS */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
263
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
264 #endif /* !_PR_HAVE_ATOMIC_OPS */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
265
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
266 void _PR_InitAtomic(void)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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267 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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268 _PR_MD_INIT_ATOMIC();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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269 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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270
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271 PR_IMPLEMENT(PRInt32)
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272 PR_AtomicIncrement(PRInt32 *val)
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273 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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274 return _PR_MD_ATOMIC_INCREMENT(val);
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275 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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276
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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277 PR_IMPLEMENT(PRInt32)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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278 PR_AtomicDecrement(PRInt32 *val)
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279 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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280 return _PR_MD_ATOMIC_DECREMENT(val);
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281 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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282
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283 PR_IMPLEMENT(PRInt32)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
284 PR_AtomicSet(PRInt32 *val, PRInt32 newval)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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285 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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286 return _PR_MD_ATOMIC_SET(val, newval);
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287 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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288
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289 PR_IMPLEMENT(PRInt32)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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290 PR_AtomicAdd(PRInt32 *ptr, PRInt32 val)
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291 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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292 return _PR_MD_ATOMIC_ADD(ptr, val);
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293 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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294 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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295 * For platforms, which don't support the CAS (compare-and-swap) instruction
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296 * (or an equivalent), the stack operations are implemented by use of PRLock
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297 */
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298
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299 PR_IMPLEMENT(PRStack *)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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300 PR_CreateStack(const char *stack_name)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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301 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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302 PRStack *stack;
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303
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Andre Heinecke <andre.heinecke@intevation.de>
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304 if (!_pr_initialized) {
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Andre Heinecke <andre.heinecke@intevation.de>
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305 _PR_ImplicitInitialization();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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306 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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307
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308 if ((stack = PR_NEW(PRStack)) == NULL) {
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309 return NULL;
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310 }
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311 if (stack_name) {
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312 stack->prstk_name = (char *) PR_Malloc(strlen(stack_name) + 1);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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313 if (stack->prstk_name == NULL) {
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314 PR_DELETE(stack);
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315 return NULL;
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316 }
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317 strcpy(stack->prstk_name, stack_name);
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318 } else
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319 stack->prstk_name = NULL;
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320
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321 #ifndef _PR_HAVE_ATOMIC_CAS
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322 stack->prstk_lock = PR_NewLock();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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323 if (stack->prstk_lock == NULL) {
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Andre Heinecke <andre.heinecke@intevation.de>
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324 PR_Free(stack->prstk_name);
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325 PR_DELETE(stack);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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326 return NULL;
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327 }
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328 #endif /* !_PR_HAVE_ATOMIC_CAS */
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329
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diff changeset
330 stack->prstk_head.prstk_elem_next = NULL;
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331
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332 return stack;
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diff changeset
333 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
334
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335 PR_IMPLEMENT(PRStatus)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
336 PR_DestroyStack(PRStack *stack)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
337 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
338 if (stack->prstk_head.prstk_elem_next != NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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339 PR_SetError(PR_INVALID_STATE_ERROR, 0);
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340 return PR_FAILURE;
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diff changeset
341 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
342
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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343 if (stack->prstk_name)
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344 PR_Free(stack->prstk_name);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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345 #ifndef _PR_HAVE_ATOMIC_CAS
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346 PR_DestroyLock(stack->prstk_lock);
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diff changeset
347 #endif /* !_PR_HAVE_ATOMIC_CAS */
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348 PR_DELETE(stack);
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349
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350 return PR_SUCCESS;
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diff changeset
351 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
352
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diff changeset
353 #ifndef _PR_HAVE_ATOMIC_CAS
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354
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355 PR_IMPLEMENT(void)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
356 PR_StackPush(PRStack *stack, PRStackElem *stack_elem)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
357 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
358 PR_Lock(stack->prstk_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
359 stack_elem->prstk_elem_next = stack->prstk_head.prstk_elem_next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
360 stack->prstk_head.prstk_elem_next = stack_elem;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
361 PR_Unlock(stack->prstk_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
362 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
363 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
364
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
365 PR_IMPLEMENT(PRStackElem *)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
366 PR_StackPop(PRStack *stack)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
367 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
368 PRStackElem *element;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
369
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
370 PR_Lock(stack->prstk_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
371 element = stack->prstk_head.prstk_elem_next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
372 if (element != NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
373 stack->prstk_head.prstk_elem_next = element->prstk_elem_next;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
374 element->prstk_elem_next = NULL; /* debugging aid */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
375 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
376 PR_Unlock(stack->prstk_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
377 return element;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
378 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
379 #endif /* !_PR_HAVE_ATOMIC_CAS */
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