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Add two scenarios by Vladimir Marangozov that show how to use your own

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allocator.
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Guido van Rossum 2000-05-05 15:36:09 +00:00
parent 4cea605e75
commit 3a03d4c4c7
1 changed files with 43 additions and 1 deletions
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44
Include/mymalloc.h
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@ -95,7 +95,10 @@ extern "C" {
The PyCore_* macros can be defined to make the interpreter use a
custom allocator. Note that they are for internal use only. Both
the core and extension modules should use the PyMem_* API. */
the core and extension modules should use the PyMem_* API.
See the comment block at the end of this file for two scenarios
showing how to use this to use a different allocator. */
#ifndef PyCore_MALLOC_FUNC
#undef PyCore_REALLOC_FUNC
@ -200,4 +203,43 @@ extern DL_IMPORT(void) PyMem_Free Py_PROTO((ANY *));
}
#endif
/* SCENARIOS
Here are two scenarios by Vladimir Marangozov (the author of the
memory allocation redesign).
1) Scenario A
Suppose you want to use a debugging malloc library that collects info on
where the malloc calls originate from. Assume the interface is:
d_malloc(size_t n, char* src_file, unsigned long src_line) c.s.
In this case, you would define (for example in config.h) :
#define PyCore_MALLOC_FUNC d_malloc
...
#define PyCore_MALLOC_PROTO Py_PROTO((size_t, char *, unsigned long))
...
#define NEED_TO_DECLARE_MALLOC_AND_FRIEND
#define PyCore_MALLOC(n) PyCore_MALLOC_FUNC((n), __FILE__, __LINE__)
...
2) Scenario B
Suppose you want to use malloc hooks (defined & initialized in a 3rd party
malloc library) instead of malloc functions. In this case, you would
define:
#define PyCore_MALLOC_FUNC (*malloc_hook)
...
#define NEED_TO_DECLARE_MALLOC_AND_FRIEND
and ignore the previous definitions about PyCore_MALLOC_FUNC, etc.
*/
#endif /* !Py_MYMALLOC_H */