Mercurial > cpython-lru_cache-weakref

annotate Modules/hashlib.h @ 87690:66c1c9f32567 default tip

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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 454e9db1c750
children
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1 /* Common code for use by all hashlib related modules. */
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2
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3 /*
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4 * Given a PyObject* obj, fill in the Py_buffer* viewp with the result
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3716d64f846b Issue #18627: Fix typo noticed by Vajrasky Kok.
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5 * of PyObject_GetBuffer. Sets an exception and issues a return NULL
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6 * on any errors.
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7 */
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8 #define GET_BUFFER_VIEW_OR_ERROUT(obj, viewp) do { \
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9 if (PyUnicode_Check((obj))) { \
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10 PyErr_SetString(PyExc_TypeError, \
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11 "Unicode-objects must be encoded before hashing");\
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12 return NULL; \
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13 } \
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14 if (!PyObject_CheckBuffer((obj))) { \
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15 PyErr_SetString(PyExc_TypeError, \
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16 "object supporting the buffer API required"); \
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17 return NULL; \
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18 } \
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19 if (PyObject_GetBuffer((obj), (viewp), PyBUF_SIMPLE) == -1) { \
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20 return NULL; \
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21 } \
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22 if ((viewp)->ndim > 1) { \
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23 PyErr_SetString(PyExc_BufferError, \
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24 "Buffer must be single dimension"); \
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25 PyBuffer_Release((viewp)); \
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26 return NULL; \
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27 } \
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28 } while(0);
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30 /*
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31 * Helper code to synchronize access to the hash object when the GIL is
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32 * released around a CPU consuming hashlib operation. All code paths that
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33 * access a mutable part of obj must be enclosed in a ENTER_HASHLIB /
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34 * LEAVE_HASHLIB block or explicitly acquire and release the lock inside
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35 * a PY_BEGIN / END_ALLOW_THREADS block if they wish to release the GIL for
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36 * an operation.
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37 */
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38
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39 #ifdef WITH_THREAD
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40 #include "pythread.h"
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41 #define ENTER_HASHLIB(obj) \
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42 if ((obj)->lock) { \
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43 if (!PyThread_acquire_lock((obj)->lock, 0)) { \
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44 Py_BEGIN_ALLOW_THREADS \
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45 PyThread_acquire_lock((obj)->lock, 1); \
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46 Py_END_ALLOW_THREADS \
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47 } \
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48 }
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49 #define LEAVE_HASHLIB(obj) \
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50 if ((obj)->lock) { \
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51 PyThread_release_lock((obj)->lock); \
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52 }
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53 #else
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54 #define ENTER_HASHLIB(obj)
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55 #define LEAVE_HASHLIB(obj)
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56 #endif
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57
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58 /* TODO(gps): We should probably make this a module or EVPobject attribute
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59 * to allow the user to optimize based on the platform they're using. */
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60 #define HASHLIB_GIL_MINSIZE 2048
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61