Mercurial > cpython-lru_cache-weakref

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 4fd3ab5fa71d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
61184
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1 /* Copyright (c) 2008-2009, Google Inc.
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are
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6 * met:
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7 *
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8 * * Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * * Neither the name of Google Inc. nor the names of its
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11 * contributors may be used to endorse or promote products derived from
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12 * this software without specific prior written permission.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *
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26 * ---
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27 * Author: Kostya Serebryany
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28 */
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29
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30 #ifdef _MSC_VER
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31 # include <windows.h>
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32 #endif
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33
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34 #ifdef __cplusplus
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35 # error "This file should be built as pure C to avoid name mangling"
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36 #endif
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37
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38 #include <stdlib.h>
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39 #include <string.h>
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40
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41 #include "dynamic_annotations.h"
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42
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43 /* Each function is empty and called (via a macro) only in debug mode.
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44 The arguments are captured by dynamic tools at runtime. */
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45
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46 #if DYNAMIC_ANNOTATIONS_ENABLED == 1
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47
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48 void AnnotateRWLockCreate(const char *file, int line,
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49 const volatile void *lock){}
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50 void AnnotateRWLockDestroy(const char *file, int line,
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51 const volatile void *lock){}
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52 void AnnotateRWLockAcquired(const char *file, int line,
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53 const volatile void *lock, long is_w){}
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54 void AnnotateRWLockReleased(const char *file, int line,
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55 const volatile void *lock, long is_w){}
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56 void AnnotateBarrierInit(const char *file, int line,
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57 const volatile void *barrier, long count,
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58 long reinitialization_allowed) {}
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59 void AnnotateBarrierWaitBefore(const char *file, int line,
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60 const volatile void *barrier) {}
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61 void AnnotateBarrierWaitAfter(const char *file, int line,
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62 const volatile void *barrier) {}
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63 void AnnotateBarrierDestroy(const char *file, int line,
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64 const volatile void *barrier) {}
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65
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66 void AnnotateCondVarWait(const char *file, int line,
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67 const volatile void *cv,
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68 const volatile void *lock){}
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69 void AnnotateCondVarSignal(const char *file, int line,
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70 const volatile void *cv){}
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71 void AnnotateCondVarSignalAll(const char *file, int line,
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72 const volatile void *cv){}
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73 void AnnotatePublishMemoryRange(const char *file, int line,
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74 const volatile void *address,
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75 long size){}
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76 void AnnotateUnpublishMemoryRange(const char *file, int line,
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77 const volatile void *address,
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78 long size){}
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79 void AnnotatePCQCreate(const char *file, int line,
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80 const volatile void *pcq){}
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81 void AnnotatePCQDestroy(const char *file, int line,
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82 const volatile void *pcq){}
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83 void AnnotatePCQPut(const char *file, int line,
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84 const volatile void *pcq){}
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85 void AnnotatePCQGet(const char *file, int line,
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86 const volatile void *pcq){}
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87 void AnnotateNewMemory(const char *file, int line,
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88 const volatile void *mem,
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89 long size){}
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90 void AnnotateExpectRace(const char *file, int line,
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91 const volatile void *mem,
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92 const char *description){}
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93 void AnnotateBenignRace(const char *file, int line,
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94 const volatile void *mem,
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95 const char *description){}
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96 void AnnotateBenignRaceSized(const char *file, int line,
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97 const volatile void *mem,
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98 long size,
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99 const char *description) {}
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100 void AnnotateMutexIsUsedAsCondVar(const char *file, int line,
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101 const volatile void *mu){}
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102 void AnnotateTraceMemory(const char *file, int line,
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103 const volatile void *arg){}
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104 void AnnotateThreadName(const char *file, int line,
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105 const char *name){}
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106 void AnnotateIgnoreReadsBegin(const char *file, int line){}
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107 void AnnotateIgnoreReadsEnd(const char *file, int line){}
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108 void AnnotateIgnoreWritesBegin(const char *file, int line){}
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109 void AnnotateIgnoreWritesEnd(const char *file, int line){}
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110 void AnnotateIgnoreSyncBegin(const char *file, int line){}
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111 void AnnotateIgnoreSyncEnd(const char *file, int line){}
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112 void AnnotateEnableRaceDetection(const char *file, int line, int enable){}
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113 void AnnotateNoOp(const char *file, int line,
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114 const volatile void *arg){}
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115 void AnnotateFlushState(const char *file, int line){}
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116
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117 static int GetRunningOnValgrind(void) {
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118 #ifdef RUNNING_ON_VALGRIND
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119 if (RUNNING_ON_VALGRIND) return 1;
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120 #endif
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121
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122 #ifndef _MSC_VER
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123 char *running_on_valgrind_str = getenv("RUNNING_ON_VALGRIND");
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124 if (running_on_valgrind_str) {
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125 return strcmp(running_on_valgrind_str, "0") != 0;
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126 }
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127 #else
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128 /* Visual Studio issues warnings if we use getenv,
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129 * so we use GetEnvironmentVariableA instead.
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130 */
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131 char value[100] = "1";
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132 int res = GetEnvironmentVariableA("RUNNING_ON_VALGRIND",
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133 value, sizeof(value));
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134 /* value will remain "1" if res == 0 or res >= sizeof(value). The latter
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135 * can happen only if the given value is long, in this case it can't be "0".
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136 */
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137 if (res > 0 && !strcmp(value, "0"))
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138 return 1;
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139 #endif
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140 return 0;
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141 }
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142
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143 /* See the comments in dynamic_annotations.h */
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144 int RunningOnValgrind(void) {
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145 static volatile int running_on_valgrind = -1;
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146 /* C doesn't have thread-safe initialization of statics, and we
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147 don't want to depend on pthread_once here, so hack it. */
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148 int local_running_on_valgrind = running_on_valgrind;
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149 if (local_running_on_valgrind == -1)
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150 running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
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151 return local_running_on_valgrind;
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152 }
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153
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154 #endif /* DYNAMIC_ANNOTATIONS_ENABLED == 1 */