diff options
| author | Ingo Molnar <mingo@elte.hu> | 2006-07-29 05:17:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-28 21:02:00 -0700 |
| commit | e3f2ddeac718c768fdac4b7fe69d465172f788a8 (patch) | |
| tree | 5428532dc6c87710c35a71858425f6d726f0e44c /include/linux | |
| parent | 627371d73cdd04ed23fe098755b4f855138ad9e0 (diff) | |
[PATCH] pi-futex: robust-futex exit
Fix robust PI-futexes to be properly unlocked on unexpected exit.
For this to work the kernel has to know whether a futex is a PI or a
non-PI one, because the semantics are different. Since the space in
relevant glibc data structures is extremely scarce, the best solution is
to encode the 'PI' information in bit 0 of the robust list pointer.
Existing (non-PI) glibc robust futexes have this bit always zero, so the
ABI is kept. New glibc with PI-robust-futexes will set this bit.
Further fixes from Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/futex.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/futex.h b/include/linux/futex.h index 34c3a215f2cd..d097b5b72bc6 100644 --- a/include/linux/futex.h +++ b/include/linux/futex.h @@ -96,7 +96,8 @@ struct robust_list_head { long do_futex(u32 __user *uaddr, int op, u32 val, unsigned long timeout, u32 __user *uaddr2, u32 val2, u32 val3); -extern int handle_futex_death(u32 __user *uaddr, struct task_struct *curr); +extern int +handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi); #ifdef CONFIG_FUTEX extern void exit_robust_list(struct task_struct *curr); |