With atomic fastbins the checks performed can race with concurrent
modifications of the arena. If we detect a problem re-do the test
after getting the lock.
The following patch fixes catomic_compare_and_exchange_*_rel definitions
(which were never used and weren't correct) and uses
catomic_compare_and_exchange_val_rel in _int_free. Comparing to the
pre-2009-07-02 --enable-experimental-malloc state the generated code should
be identical on all arches other than ppc/ppc64 and on ppc/ppc64 should use
lwsync instead of isync barrier.
2009-04-16 Ulrich Drepper <drepper@redhat.com>
[BZ #9957]
* malloc/malloc.c (force_reg): Define.
(sYSMALLOc): Load hook variable into variable
before test and force into register.
(sYSTRIm): Likewise.
(public_mALLOc): Force hook value into register.
(public_fREe): Likewise.
(public_rEALLOc): Likewise.
(public_mEMALIGn): Likewise.
(public_vALLOc): Likewise.
(public_pVALLOc): Likewise.
(public_cALLOc): Likewise.
(__posix_memalign): Likewise.
* malloc/arena.c (ptmalloc_init): Load hook variable into variable
before test and force into register.
* malloc/hooks.c (top_check): Likewise.
(public_s_ET_STATe): Pretty printing.
* resolv/res_send.c (send_dg): Don't just ignore the result we got
in case we only receive one reply in single-request mode.
Change all callers.
(_int_realloc): Likewise.
All _int_* functions are now static.
* malloc/hooks.c: Change all callers to _int_free and _int_realloc.
* malloc/arena.c: Likewise.
* include/malloc.h: Remove now unnecessary declarations of the _int_*
functions.
mTRIm for all of them.
(mTRIm): Additionally iterate over all free blocks and use madvise
to free memory for all those blocks which contain at least one
memory page.
* malloc/malloc.c (do_check_malloc_state): Minimal cleanups.
(public_sET_STATe): If ms->version < 3, put all chunks into
unsorted chunks and clear {fd,bk}_nextsize fields of largebin
chunks.
* malloc/malloc.c [MALLOC_DEBUG]: Revert 2007-05-13 changes.
* malloc/hooks.c: Likewise.
* malloc/arena.c: Likewise.
* malloc/malloc.c (do_check_malloc_state): Don't assert
n_mmaps is not greater than n_mmaps_max. This removes the need
for the previous change.
* malloc/Makefile (CFLAGS-malloc.c): Revert accidental
2007-05-07 commit.
2007-04-30 Ulrich Drepper <drepper@redhat.com>
Jakub Jelinek <jakub@redhat.com>
[BZ #4349]
* malloc/malloc.c: Keep separate list for first blocks on the bin
lists with a given size. This helps skipping over list elements
we know won't fit in two places.
Inspired by a patch by Tomash Brechko <tomash.brechko@gmail.com>.
