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annotate third_party/wrk/src/atomicvar.h @ 199:b4a070994b54

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Adding exmaple env file.
author MrJuneJune <me@mrjunejune.com>
date Sat, 14 Feb 2026 16:18:25 -0800
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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178
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1 /* This file implements atomic counters using __atomic or __sync macros if
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2 * available, otherwise synchronizing different threads using a mutex.
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3 *
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4 * The exported interaface is composed of three macros:
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5 *
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6 * atomicIncr(var,count) -- Increment the atomic counter
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7 * atomicGetIncr(var,oldvalue_var,count) -- Get and increment the atomic counter
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8 * atomicDecr(var,count) -- Decrement the atomic counter
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9 * atomicGet(var,dstvar) -- Fetch the atomic counter value
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10 * atomicSet(var,value) -- Set the atomic counter value
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11 *
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12 * The variable 'var' should also have a declared mutex with the same
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13 * name and the "_mutex" postfix, for instance:
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14 *
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15 * long myvar;
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16 * pthread_mutex_t myvar_mutex;
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17 * atomicSet(myvar,12345);
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18 *
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19 * If atomic primitives are availble (tested in config.h) the mutex
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20 * is not used.
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21 *
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22 * Never use return value from the macros, instead use the AtomicGetIncr()
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23 * if you need to get the current value and increment it atomically, like
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24 * in the followign example:
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25 *
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26 * long oldvalue;
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27 * atomicGetIncr(myvar,oldvalue,1);
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28 * doSomethingWith(oldvalue);
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29 *
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30 * ----------------------------------------------------------------------------
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31 *
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32 * Copyright (c) 2015, Salvatore Sanfilippo <antirez at gmail dot com>
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33 * All rights reserved.
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34 *
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35 * Redistribution and use in source and binary forms, with or without
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36 * modification, are permitted provided that the following conditions are met:
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37 *
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38 * * Redistributions of source code must retain the above copyright notice,
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39 * this list of conditions and the following disclaimer.
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40 * * Redistributions in binary form must reproduce the above copyright
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41 * notice, this list of conditions and the following disclaimer in the
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42 * documentation and/or other materials provided with the distribution.
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43 * * Neither the name of Redis nor the names of its contributors may be used
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44 * to endorse or promote products derived from this software without
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45 * specific prior written permission.
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46 *
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47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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57 * POSSIBILITY OF SUCH DAMAGE.
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58 */
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59
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60 #include <pthread.h>
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61
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62 #ifndef __ATOMIC_VAR_H
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63 #define __ATOMIC_VAR_H
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64
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65 /* To test Redis with Helgrind (a Valgrind tool) it is useful to define
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66 * the following macro, so that __sync macros are used: those can be detected
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67 * by Helgrind (even if they are less efficient) so that no false positive
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68 * is reported. */
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69 // #define __ATOMIC_VAR_FORCE_SYNC_MACROS
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70
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71 #if !defined(__ATOMIC_VAR_FORCE_SYNC_MACROS) && defined(__ATOMIC_RELAXED) && !defined(__sun) && (!defined(__clang__) || !defined(__APPLE__) || __apple_build_version__ > 4210057)
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72 /* Implementation using __atomic macros. */
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73
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74 #define atomicIncr(var,count) __atomic_add_fetch(&var,(count),__ATOMIC_RELAXED)
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75 #define atomicGetIncr(var,oldvalue_var,count) do { \
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76 oldvalue_var = __atomic_fetch_add(&var,(count),__ATOMIC_RELAXED); \
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77 } while(0)
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78 #define atomicDecr(var,count) __atomic_sub_fetch(&var,(count),__ATOMIC_RELAXED)
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79 #define atomicGet(var,dstvar) do { \
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80 dstvar = __atomic_load_n(&var,__ATOMIC_RELAXED); \
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81 } while(0)
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82 #define atomicSet(var,value) __atomic_store_n(&var,value,__ATOMIC_RELAXED)
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83 #define REDIS_ATOMIC_API "atomic-builtin"
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84
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85 #elif defined(HAVE_ATOMIC)
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86 /* Implementation using __sync macros. */
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87
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88 #define atomicIncr(var,count) __sync_add_and_fetch(&var,(count))
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89 #define atomicGetIncr(var,oldvalue_var,count) do { \
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90 oldvalue_var = __sync_fetch_and_add(&var,(count)); \
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91 } while(0)
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92 #define atomicDecr(var,count) __sync_sub_and_fetch(&var,(count))
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93 #define atomicGet(var,dstvar) do { \
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94 dstvar = __sync_sub_and_fetch(&var,0); \
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95 } while(0)
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96 #define atomicSet(var,value) do { \
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97 while(!__sync_bool_compare_and_swap(&var,var,value)); \
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98 } while(0)
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99 #define REDIS_ATOMIC_API "sync-builtin"
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100
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101 #else
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102 /* Implementation using pthread mutex. */
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103
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104 #define atomicIncr(var,count) do { \
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105 pthread_mutex_lock(&var ## _mutex); \
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106 var += (count); \
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107 pthread_mutex_unlock(&var ## _mutex); \
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108 } while(0)
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109 #define atomicGetIncr(var,oldvalue_var,count) do { \
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110 pthread_mutex_lock(&var ## _mutex); \
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111 oldvalue_var = var; \
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112 var += (count); \
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113 pthread_mutex_unlock(&var ## _mutex); \
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114 } while(0)
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115 #define atomicDecr(var,count) do { \
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116 pthread_mutex_lock(&var ## _mutex); \
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117 var -= (count); \
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118 pthread_mutex_unlock(&var ## _mutex); \
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119 } while(0)
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120 #define atomicGet(var,dstvar) do { \
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121 pthread_mutex_lock(&var ## _mutex); \
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122 dstvar = var; \
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123 pthread_mutex_unlock(&var ## _mutex); \
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124 } while(0)
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125 #define atomicSet(var,value) do { \
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126 pthread_mutex_lock(&var ## _mutex); \
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127 var = value; \
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128 pthread_mutex_unlock(&var ## _mutex); \
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129 } while(0)
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130 #define REDIS_ATOMIC_API "pthread-mutex"
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131
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132 #endif
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133 #endif /* __ATOMIC_VAR_H */