git: libc - Fix some recursion issues during thread teardown
commit 6c4de62c59ba95420ee712e340c8dd8d0ab4b1f9
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Oct 4 11:35:48 2010 -0700
libc - Fix some recursion issues during thread teardown
* thread destructors called by sophisticated pthreaded programs such
as firefox can wind up allocating/freeing space multiple times
AFTER nmalloc's destructor is run.
This can leave the mtmagazine in a weird state because it's destructor
fails to NULL-out tp->mags[i].loaded and tp->mags[i].prev.
* Properly NULL out tp->mags[i].{loaded,prev} in the destructor.
* Lockout mtmagazine use while the mtmagazine is being initialized or
destroyed.
* Permanently lockout mtmagazine use after its destructor has been run.
* Instead of trying to initialize the mtmagazine on the first free, which
might not occur until the destrutor is run (causing pthreads to complain
about destructors being left hanging), have libthread_xu call a new
function _nmalloc_thr_init() during thread creation and do all the slab
initialization there.
Summary of changes:
lib/libc/include/libc_private.h | 1 +
lib/libc/stdlib/nmalloc.c | 96 ++++++++++++++++++++++++++--------
lib/libthread_xu/thread/thr_create.c | 1 +
3 files changed, 75 insertions(+), 23 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6c4de62c59ba95420ee712e340c8dd8d0ab4b1f9
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