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 257cbd2fac38
children
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "dl.h"
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5 #include <errno.h>
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7 #include "Python.h"
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8 #include "importdl.h"
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9
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10 #if defined(__hp9000s300)
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11 #define FUNCNAME_PATTERN "_PyInit_%.200s"
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12 #else
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13 #define FUNCNAME_PATTERN "PyInit_%.200s"
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14 #endif
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15
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16 const char *_PyImport_DynLoadFiletab[] = {SHLIB_EXT, NULL};
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18 dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
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19 const char *pathname, FILE *fp)
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20 {
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21 dl_funcptr p;
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22 shl_t lib;
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23 int flags;
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24 char funcname[258];
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26 flags = BIND_FIRST | BIND_DEFERRED;
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27 if (Py_VerboseFlag) {
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28 flags = BIND_FIRST | BIND_IMMEDIATE |
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29 BIND_NONFATAL | BIND_VERBOSE;
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30 printf("shl_load %s\n",pathname);
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31 }
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32 lib = shl_load(pathname, flags, 0);
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33 /* XXX Chuck Blake once wrote that 0 should be BIND_NOSTART? */
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34 if (lib == NULL) {
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35 char buf[256];
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36 PyObject *pathname_ob = NULL;
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37 PyObject *buf_ob = NULL;
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38 PyObject *shortname_ob = NULL;
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39
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40 if (Py_VerboseFlag)
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41 perror(pathname);
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42 PyOS_snprintf(buf, sizeof(buf), "Failed to load %.200s",
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43 pathname);
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44 buf_ob = PyUnicode_FromString(buf);
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45 shortname_ob = PyUnicode_FromString(shortname);
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46 pathname_ob = PyUnicode_FromString(pathname);
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47 PyErr_SetImportError(buf_ob, shortname_ob, pathname_ob);
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48 Py_DECREF(buf_ob);
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49 Py_DECREF(shortname_ob);
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50 Py_DECREF(pathname_ob);
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51 return NULL;
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52 }
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53 PyOS_snprintf(funcname, sizeof(funcname), FUNCNAME_PATTERN, shortname);
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54 if (Py_VerboseFlag)
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55 printf("shl_findsym %s\n", funcname);
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56 if (shl_findsym(&lib, funcname, TYPE_UNDEFINED, (void *) &p) == -1) {
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57 shl_unload(lib);
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58 p = NULL;
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59 }
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60 if (p == NULL && Py_VerboseFlag)
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61 perror(funcname);
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62
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63 return p;
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64 }