Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Nick Piggin d4212093dc ipc/sem.c: sem preempt improve ... The strange sysv semaphore wakeup scheme has a kind of busy-wait lock involved, which could deadlock if preemption is enabled during the "lock". It is an implementation detail (due to a spinlock being held) that this is actually the case. However if "spinlocks" are made preemptible, or if the sem lock is changed to a sleeping lock for example, then the wakeup would become buggy. So this might be a bugfix for -rt kernels. Imagine waker being preempted by wakee and never clearing IN_WAKEUP -- if wakee has higher RT priority then there is a priority inversion deadlock. Even if there is not a priority inversion to cause a deadlock, then there is still time wasted spinning. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: Pierre Peiffer <peifferp@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-12-16 07:20:09 -08:00
..
compat.c
compat_mq.c
ipc_sysctl.c	sysctl ipc: Remove dead binary sysctl support code.	2009-11-12 02:04:54 -08:00
ipcns_notifier.c
Makefile
mq_sysctl.c	sysctl ipc: Remove dead binary sysctl support code.	2009-11-12 02:04:54 -08:00
mqueue.c
msg.c	ipc ns: fix memory leak (idr)	2009-12-16 07:20:09 -08:00
msgutil.c
namespace.c
sem.c	ipc/sem.c: sem preempt improve	2009-12-16 07:20:09 -08:00
shm.c	ipc ns: fix memory leak (idr)	2009-12-16 07:20:09 -08:00
util.c	seq_file: constify seq_operations	2009-09-23 07:39:29 -07:00
util.h