diff options
| -rw-r--r-- | com32/lib/realloc.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/com32/lib/realloc.c b/com32/lib/realloc.c index 802d973c..89b63c8e 100644 --- a/com32/lib/realloc.c +++ b/com32/lib/realloc.c @@ -65,10 +65,21 @@ void *realloc(void *ptr, size_t size) nah->a.prev = ah; /* Insert into free list */ - nah->next_free = __malloc_head.next_free; - nah->prev_free = &__malloc_head; - __malloc_head.next_free = nah; - nah->next_free->prev_free = nah; + if (newsize > oldsize) { + /* Hack: this free block is in the path of a memory object + which has already been grown at least once. As such, put + it at the *end* of the freelist instead of the beginning; + trying to save it for future realloc()s of the same block. */ + nah->prev_free = __malloc_head.prev_free; + nah->next_free = &__malloc_head; + __malloc_head.prev_free = nah; + nah->prev_free->next_free = nah; + } else { + nah->next_free = __malloc_head.next_free; + nah->prev_free = &__malloc_head; + __malloc_head.next_free = nah; + nah->next_free->prev_free = nah; + } } /* otherwise, use up the whole block */ return ptr; |