Re: No realloc
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- Subject: Re: No realloc
- From: roberto@... (Roberto Ierusalimschy)
- Date: 2007年10月18日 13:55:29 -0200
> I'm considering using Lua on a system offering no realloc(): only
> malloc() and free().
>
> What loss of performance could I expect by using realloc=free+malloc,
> assuming the allocator is stupid enough not to immediately recycle the
> same block when there is enough space?
Why don't you test? It is quite easy to change the allocation function not
to use realloc; something like this (untested):
void *l_alloc (void *ud, void *block, size_t oldsize, size_t size) {
if (size == 0) {
free(block);
return NULL;
}
else {
void *newblock = malloc(size); /* alloc a new block */
if (newblock == NULL) return NULL;
if (block) {
size_t commonsize = (oldsize < size) ? oldsize : size;
memcpy(newblock, block, commonsize);
free(block);
}
return newblock;
}
}
-- Roberto