1/* Common code for use by all hashlib related modules. */
2
3/*
4 * Given a PyObject* obj, fill in the Py_buffer* viewp with the result
5 * of PyObject_GetBuffer. Sets an exception and issues the erraction
6 * on any errors, e.g. 'return NULL' or 'goto error'.
7 */
8#define GET_BUFFER_VIEW_OR_ERROR(obj, viewp, erraction) do { \
9 if (PyUnicode_Check((obj))) { \
10 PyErr_SetString(PyExc_TypeError, \
11 "Strings must be encoded before hashing");\
12 erraction; \
13 } \
14 if (!PyObject_CheckBuffer((obj))) { \
15 PyErr_SetString(PyExc_TypeError, \
16 "object supporting the buffer API required"); \
17 erraction; \
18 } \
19 if (PyObject_GetBuffer((obj), (viewp), PyBUF_SIMPLE) == -1) { \
20 erraction; \
21 } \
22 if ((viewp)->ndim > 1) { \
23 PyErr_SetString(PyExc_BufferError, \
24 "Buffer must be single dimension"); \
25 PyBuffer_Release((viewp)); \
26 erraction; \
27 } \
28 } while(0)
29
30#define GET_BUFFER_VIEW_OR_ERROUT(obj, viewp) \
31 GET_BUFFER_VIEW_OR_ERROR(obj, viewp, return NULL)
32
33/*
34 * Helper code to synchronize access to the hash object when the GIL is
35 * released around a CPU consuming hashlib operation. All code paths that
36 * access a mutable part of obj must be enclosed in an ENTER_HASHLIB /
37 * LEAVE_HASHLIB block or explicitly acquire and release the lock inside
38 * a PY_BEGIN / END_ALLOW_THREADS block if they wish to release the GIL for
39 * an operation.
40 */
41
42#include "pythread.h"
43#define ENTER_HASHLIB(obj) \
44 if ((obj)->lock) { \
45 if (!PyThread_acquire_lock((obj)->lock, 0)) { \
46 Py_BEGIN_ALLOW_THREADS \
47 PyThread_acquire_lock((obj)->lock, 1); \
48 Py_END_ALLOW_THREADS \
49 } \
50 }
51#define LEAVE_HASHLIB(obj) \
52 if ((obj)->lock) { \
53 PyThread_release_lock((obj)->lock); \
54 }
55
56/* TODO(gps): We should probably make this a module or EVPobject attribute
57 * to allow the user to optimize based on the platform they're using. */
58#define HASHLIB_GIL_MINSIZE 2048
59
60