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annotate nspr/pr/include/pratom.h @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +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 /* GLOBAL FUNCTIONS:
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7 ** DESCRIPTION:
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8 ** PR Atomic operations
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9 */
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10
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11 #ifndef pratom_h___
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12 #define pratom_h___
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13
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14 #include "prtypes.h"
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15 #include "prlock.h"
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16
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17 PR_BEGIN_EXTERN_C
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18
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19 /*
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20 ** FUNCTION: PR_AtomicIncrement
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21 ** DESCRIPTION:
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22 ** Atomically increment a 32 bit value.
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23 ** INPUTS:
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24 ** val: a pointer to the value to increment
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25 ** RETURN:
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26 ** the returned value is the result of the increment
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27 */
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28 NSPR_API(PRInt32) PR_AtomicIncrement(PRInt32 *val);
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29
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30 /*
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31 ** FUNCTION: PR_AtomicDecrement
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32 ** DESCRIPTION:
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33 ** Atomically decrement a 32 bit value.
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34 ** INPUTS:
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35 ** val: a pointer to the value to decrement
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36 ** RETURN:
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37 ** the returned value is the result of the decrement
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38 */
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39 NSPR_API(PRInt32) PR_AtomicDecrement(PRInt32 *val);
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40
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41 /*
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42 ** FUNCTION: PR_AtomicSet
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43 ** DESCRIPTION:
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44 ** Atomically set a 32 bit value.
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45 ** INPUTS:
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46 ** val: A pointer to a 32 bit value to be set
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47 ** newval: The newvalue to assign to val
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48 ** RETURN:
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49 ** Returns the prior value
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50 */
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51 NSPR_API(PRInt32) PR_AtomicSet(PRInt32 *val, PRInt32 newval);
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52
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53 /*
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54 ** FUNCTION: PR_AtomicAdd
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55 ** DESCRIPTION:
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56 ** Atomically add a 32 bit value.
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57 ** INPUTS:
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58 ** ptr: a pointer to the value to increment
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59 ** val: value to be added
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60 ** RETURN:
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61 ** the returned value is the result of the addition
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62 */
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63 NSPR_API(PRInt32) PR_AtomicAdd(PRInt32 *ptr, PRInt32 val);
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64
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65 /*
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66 ** MACRO: PR_ATOMIC_INCREMENT
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67 ** MACRO: PR_ATOMIC_DECREMENT
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68 ** MACRO: PR_ATOMIC_SET
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69 ** MACRO: PR_ATOMIC_ADD
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70 ** DESCRIPTION:
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71 ** Macro versions of the atomic operations. They may be implemented
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72 ** as compiler intrinsics.
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73 **
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74 ** IMPORTANT NOTE TO NSPR MAINTAINERS:
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75 ** Implement these macros with compiler intrinsics only on platforms
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76 ** where the PR_AtomicXXX functions are truly atomic (i.e., where the
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77 ** configuration macro _PR_HAVE_ATOMIC_OPS is defined). Otherwise,
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78 ** the macros and functions won't be compatible and can't be used
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79 ** interchangeably.
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80 */
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81 #if defined(_WIN32) && !defined(_WIN32_WCE) && \
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82 (!defined(_MSC_VER) || (_MSC_VER >= 1310))
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83
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84 long __cdecl _InterlockedIncrement(long volatile *Addend);
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85 long __cdecl _InterlockedDecrement(long volatile *Addend);
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86 long __cdecl _InterlockedExchange(long volatile *Target, long Value);
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87 long __cdecl _InterlockedExchangeAdd(long volatile *Addend, long Value);
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88
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89 #ifdef _MSC_VER
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90 #pragma intrinsic(_InterlockedIncrement)
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91 #pragma intrinsic(_InterlockedDecrement)
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92 #pragma intrinsic(_InterlockedExchange)
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93 #pragma intrinsic(_InterlockedExchangeAdd)
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94 #endif
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95
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96 #define PR_ATOMIC_INCREMENT(val) _InterlockedIncrement((long volatile *)(val))
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97 #define PR_ATOMIC_DECREMENT(val) _InterlockedDecrement((long volatile *)(val))
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98 #define PR_ATOMIC_SET(val, newval) \
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99 _InterlockedExchange((long volatile *)(val), (long)(newval))
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100 #define PR_ATOMIC_ADD(ptr, val) \
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101 (_InterlockedExchangeAdd((long volatile *)(ptr), (long)(val)) + (val))
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102
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103 #elif ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && \
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104 ((defined(__APPLE__) && \
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105 (defined(__ppc__) || defined(__i386__) || defined(__x86_64__))) || \
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106 (defined(__linux__) && \
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107 ((defined(__i386__) && \
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108 defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
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109 defined(__ia64__) || defined(__x86_64__) || \
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110 (defined(__powerpc__) && !defined(__powerpc64__)) || \
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111 (defined(__arm__) && \
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112 defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \
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113 defined(__aarch64__) || defined(__alpha))))
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114
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115 /*
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116 * Because the GCC manual warns that some processors may support
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117 * reduced functionality of __sync_lock_test_and_set, we test for the
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118 * processors that we believe support a full atomic exchange operation.
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119 */
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120
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121 #define PR_ATOMIC_INCREMENT(val) __sync_add_and_fetch(val, 1)
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122 #define PR_ATOMIC_DECREMENT(val) __sync_sub_and_fetch(val, 1)
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123 #define PR_ATOMIC_SET(val, newval) __sync_lock_test_and_set(val, newval)
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124 #define PR_ATOMIC_ADD(ptr, val) __sync_add_and_fetch(ptr, val)
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125
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126 #else
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127
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128 #define PR_ATOMIC_INCREMENT(val) PR_AtomicIncrement(val)
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129 #define PR_ATOMIC_DECREMENT(val) PR_AtomicDecrement(val)
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130 #define PR_ATOMIC_SET(val, newval) PR_AtomicSet(val, newval)
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131 #define PR_ATOMIC_ADD(ptr, val) PR_AtomicAdd(ptr, val)
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132
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133 #endif
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134
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135 /*
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136 ** LIFO linked-list (stack)
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137 */
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138 typedef struct PRStackElemStr PRStackElem;
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139
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140 struct PRStackElemStr {
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141 PRStackElem *prstk_elem_next; /* next pointer MUST be at offset 0;
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142 assembly language code relies on this */
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143 };
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144
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145 typedef struct PRStackStr PRStack;
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146
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147 /*
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148 ** FUNCTION: PR_CreateStack
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149 ** DESCRIPTION:
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150 ** Create a stack, a LIFO linked list
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151 ** INPUTS:
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152 ** stack_name: a pointer to string containing the name of the stack
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153 ** RETURN:
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154 ** A pointer to the created stack, if successful, else NULL.
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155 */
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156 NSPR_API(PRStack *) PR_CreateStack(const char *stack_name);
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157
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158 /*
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159 ** FUNCTION: PR_StackPush
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160 ** DESCRIPTION:
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161 ** Push an element on the top of the stack
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162 ** INPUTS:
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163 ** stack: pointer to the stack
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164 ** stack_elem: pointer to the stack element
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165 ** RETURN:
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166 ** None
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167 */
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168 NSPR_API(void) PR_StackPush(PRStack *stack, PRStackElem *stack_elem);
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169
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170 /*
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171 ** FUNCTION: PR_StackPop
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172 ** DESCRIPTION:
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173 ** Remove the element on the top of the stack
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174 ** INPUTS:
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175 ** stack: pointer to the stack
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176 ** RETURN:
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177 ** A pointer to the stack element removed from the top of the stack,
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178 ** if non-empty,
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179 ** else NULL
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180 */
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181 NSPR_API(PRStackElem *) PR_StackPop(PRStack *stack);
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182
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183 /*
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184 ** FUNCTION: PR_DestroyStack
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185 ** DESCRIPTION:
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186 ** Destroy the stack
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187 ** INPUTS:
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188 ** stack: pointer to the stack
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189 ** RETURN:
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190 ** PR_SUCCESS - if successfully deleted
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191 ** PR_FAILURE - if the stack is not empty
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192 ** PR_GetError will return
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193 ** PR_INVALID_STATE_ERROR - stack is not empty
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194 */
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195 NSPR_API(PRStatus) PR_DestroyStack(PRStack *stack);
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196
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197 PR_END_EXTERN_C
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198
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199 #endif /* pratom_h___ */
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