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branches/zip: buf_buddy_free_low(): Examine the state bits inside the

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block before traversing the free list.
This commit is contained in:
marko 2006-12-18 12:55:04 +00:00
parent 2eb7e547c3
commit 0a70979184
1 changed files with 10 additions and 0 deletions
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10
buf/buf0buddy.c
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@ -413,6 +413,15 @@ recombine:
buddy = (buf_page_t*) buf_buddy_get(((byte*) buf), BUF_BUDDY_LOW << i);
if (buddy->state != BUF_BLOCK_ZIP_FREE) {
goto buddy_nonfree;
}
/* The field buddy->state can only be trusted for free blocks.
If buddy->state == BUF_BLOCK_ZIP_FREE, the block is free if
it is in the free list. */
for (bpage = UT_LIST_GET_FIRST(buf_pool->zip_free[i]);
bpage; bpage = UT_LIST_GET_NEXT(list, bpage)) {
ut_ad(buf_page_get_state(bpage) == BUF_BLOCK_ZIP_FREE);
@ -436,6 +445,7 @@ buddy_free:
ut_a(bpage != buf);
}
buddy_nonfree:
/* The buddy is not free. Is there a free block of this size? */
bpage = UT_LIST_GET_FIRST(buf_pool->zip_free[i]);