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comments, minor changes

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mysys/lf_alloc-pin.c:
  comments
mysys/lf_dynarray.c:
  comments
mysys/lf_hash.c:
  comments, charset-aware comparison
storage/maria/trnman.c:
  comments
storage/maria/unittest/lockman-t.c:
  test case for a bug
unittest/mysys/my_atomic-t.c:
  removed mistakenly copied line
This commit is contained in:
unknown
2006-10-27 17:09:31 +02:00
parent ce707d9f7f
commit 7ca33ae5b5
6 changed files with 140 additions and 62 deletions
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25
mysys/lf_dynarray.c
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@ -26,10 +26,15 @@
Every element is aligned to sizeof(element) boundary
(to avoid false sharing if element is big enough).
LF_DYNARRAY is a recursive structure. On the zero level
LF_DYNARRAY::level[0] it's an array of LF_DYNARRAY_LEVEL_LENGTH elements,
on the first level it's an array of LF_DYNARRAY_LEVEL_LENGTH pointers
to arrays of elements, on the second level it's an array of pointers
to arrays of pointers to arrays of elements. And so on.
Actually, it's wait-free, not lock-free ;-)
*/
#undef DBUG_OFF
#include <my_global.h>
#include <strings.h>
#include <my_sys.h>
@ -75,6 +80,10 @@ static const int dynarray_idxes_in_prev_level[LF_DYNARRAY_LEVELS]=
LF_DYNARRAY_LEVEL_LENGTH
};
/*
Returns a valid lvalue pointer to the element number 'idx'.
Allocates memory if necessary.
*/
void *_lf_dynarray_lvalue(LF_DYNARRAY *array, uint idx)
{
void * ptr, * volatile * ptr_ptr= 0;
@ -123,6 +132,10 @@ void *_lf_dynarray_lvalue(LF_DYNARRAY *array, uint idx)
return ptr + array->size_of_element * idx;
}
/*
Returns a pointer to the element number 'idx'
or NULL if an element does not exists
*/
void *_lf_dynarray_value(LF_DYNARRAY *array, uint idx)
{
void * ptr, * volatile * ptr_ptr= 0;
@ -157,6 +170,16 @@ static int recursive_iterate(LF_DYNARRAY *array, void *ptr, int level,
return 0;
}
/*
Calls func(array, arg) on every array of LF_DYNARRAY_LEVEL_LENGTH elements
in lf_dynarray.
DESCRIPTION
lf_dynarray consists of a set of arrays, LF_DYNARRAY_LEVEL_LENGTH elements
each. _lf_dynarray_iterate() calls user-supplied function on every array
from the set. It is the fastest way to scan the array, faster than
for (i=0; i < N; i++) { func(_lf_dynarray_value(dynarray, i)); }
*/
int _lf_dynarray_iterate(LF_DYNARRAY *array, lf_dynarray_func func, void *arg)
{
int i, res;