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 bc0281f85409
children
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1 /* Memory view object. In Python this is available as "memoryview". */
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2
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3 #ifndef Py_MEMORYOBJECT_H
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4 #define Py_MEMORYOBJECT_H
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5 #ifdef __cplusplus
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6 extern "C" {
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7 #endif
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8
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9 #ifndef Py_LIMITED_API
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10 PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
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11 #endif
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12 PyAPI_DATA(PyTypeObject) PyMemoryView_Type;
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13
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14 #define PyMemoryView_Check(op) (Py_TYPE(op) == &PyMemoryView_Type)
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15
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16 #ifndef Py_LIMITED_API
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17 /* Get a pointer to the memoryview's private copy of the exporter's buffer. */
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18 #define PyMemoryView_GET_BUFFER(op) (&((PyMemoryViewObject *)(op))->view)
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19 /* Get a pointer to the exporting object (this may be NULL!). */
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20 #define PyMemoryView_GET_BASE(op) (((PyMemoryViewObject *)(op))->view.obj)
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21 #endif
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22
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23 PyAPI_FUNC(PyObject *) PyMemoryView_FromObject(PyObject *base);
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24 PyAPI_FUNC(PyObject *) PyMemoryView_FromMemory(char *mem, Py_ssize_t size,
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25 int flags);
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26 #ifndef Py_LIMITED_API
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27 PyAPI_FUNC(PyObject *) PyMemoryView_FromBuffer(Py_buffer *info);
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28 #endif
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29 PyAPI_FUNC(PyObject *) PyMemoryView_GetContiguous(PyObject *base,
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30 int buffertype,
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31 char order);
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32
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33
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34 /* The structs are declared here so that macros can work, but they shouldn't
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35 be considered public. Don't access their fields directly, use the macros
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36 and functions instead! */
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37 #ifndef Py_LIMITED_API
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38 #define _Py_MANAGED_BUFFER_RELEASED 0x001 /* access to exporter blocked */
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39 #define _Py_MANAGED_BUFFER_FREE_FORMAT 0x002 /* free format */
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40 typedef struct {
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41 PyObject_HEAD
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42 int flags; /* state flags */
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43 Py_ssize_t exports; /* number of direct memoryview exports */
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44 Py_buffer master; /* snapshot buffer obtained from the original exporter */
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45 } _PyManagedBufferObject;
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46
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47
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48 /* static storage used for casting between formats */
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49 #define _Py_MEMORYVIEW_MAX_FORMAT 3 /* must be >= 3 */
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50
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51 /* memoryview state flags */
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52 #define _Py_MEMORYVIEW_RELEASED 0x001 /* access to master buffer blocked */
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53 #define _Py_MEMORYVIEW_C 0x002 /* C-contiguous layout */
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54 #define _Py_MEMORYVIEW_FORTRAN 0x004 /* Fortran contiguous layout */
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55 #define _Py_MEMORYVIEW_SCALAR 0x008 /* scalar: ndim = 0 */
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56 #define _Py_MEMORYVIEW_PIL 0x010 /* PIL-style layout */
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57
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58 typedef struct {
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59 PyObject_VAR_HEAD
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60 _PyManagedBufferObject *mbuf; /* managed buffer */
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61 Py_hash_t hash; /* hash value for read-only views */
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62 int flags; /* state flags */
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63 Py_ssize_t exports; /* number of buffer re-exports */
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64 Py_buffer view; /* private copy of the exporter's view */
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65 char format[_Py_MEMORYVIEW_MAX_FORMAT]; /* used for casting */
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66 PyObject *weakreflist;
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67 Py_ssize_t ob_array[1]; /* shape, strides, suboffsets */
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68 } PyMemoryViewObject;
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69 #endif
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71 #ifdef __cplusplus
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72 }
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73 #endif
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74 #endif /* !Py_MEMORYOBJECT_H */