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 47c6aa17fd90
children
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92bcf4cc9421 This is now the "real" main program -- it calls Py_Main(argc, argv)
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1 /* Minimal main program -- everything is loaded from the library */
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2
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3 #include "Python.h"
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4 #include <locale.h>
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5
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6 #ifdef __FreeBSD__
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7 #include <floatingpoint.h>
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8 #endif
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9
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10 #ifdef MS_WINDOWS
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11 int
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12 wmain(int argc, wchar_t **argv)
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13 {
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14 return Py_Main(argc, argv);
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15 }
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16 #else
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17
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18 int
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19 main(int argc, char **argv)
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20 {
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21 wchar_t **argv_copy;
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22 /* We need a second copy, as Python might modify the first one. */
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23 wchar_t **argv_copy2;
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24 int i, res;
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25 char *oldloc;
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26 #ifdef __FreeBSD__
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27 fp_except_t m;
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28 #endif
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29
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30 argv_copy = (wchar_t **)PyMem_RawMalloc(sizeof(wchar_t*) * (argc+1));
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31 argv_copy2 = (wchar_t **)PyMem_RawMalloc(sizeof(wchar_t*) * (argc+1));
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32 if (!argv_copy || !argv_copy2) {
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33 fprintf(stderr, "out of memory\n");
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34 return 1;
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35 }
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36
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37 /* 754 requires that FP exceptions run in "no stop" mode by default,
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38 * and until C vendors implement C99's ways to control FP exceptions,
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39 * Python requires non-stop mode. Alas, some platforms enable FP
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40 * exceptions by default. Here we disable them.
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41 */
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42 #ifdef __FreeBSD__
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43 m = fpgetmask();
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44 fpsetmask(m & ~FP_X_OFL);
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45 #endif
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46
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47 oldloc = _PyMem_RawStrdup(setlocale(LC_ALL, NULL));
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48 if (!oldloc) {
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49 fprintf(stderr, "out of memory\n");
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50 return 1;
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51 }
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52
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53 setlocale(LC_ALL, "");
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54 for (i = 0; i < argc; i++) {
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55 argv_copy[i] = _Py_char2wchar(argv[i], NULL);
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56 if (!argv_copy[i]) {
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57 PyMem_RawFree(oldloc);
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58 fprintf(stderr, "Fatal Python error: "
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59 "unable to decode the command line argument #%i\n",
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60 i + 1);
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61 return 1;
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62 }
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63 argv_copy2[i] = argv_copy[i];
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64 }
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65 argv_copy2[argc] = argv_copy[argc] = NULL;
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66
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67 setlocale(LC_ALL, oldloc);
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68 PyMem_RawFree(oldloc);
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69 res = Py_Main(argc, argv_copy);
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70 for (i = 0; i < argc; i++) {
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71 PyMem_RawFree(argv_copy2[i]);
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72 }
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73 PyMem_RawFree(argv_copy);
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74 PyMem_RawFree(argv_copy2);
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75 return res;
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76 }
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77 #endif