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annotate third_party/wrk/src/atomicvar.h @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 94705b5986b3
children
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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 */