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| author |   Manfred Spraul <manfred@colorfullife.com> | 2009-12-15 16:47:31 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:09 -0800 |
| commit | b6e90822e77cd476c18410f7003197d466e36ac6 (patch) | |
| tree | 2ff18df8c024ae92e7e8912186c34b10b4b6f4bd /include/linux/sem.h | |
| parent | ipc/sem.c: sem preempt improve (diff) | |
| download | linux-dev-b6e90822e77cd476c18410f7003197d466e36ac6.tar.xz linux-dev-b6e90822e77cd476c18410f7003197d466e36ac6.zip | |
ipc/sem.c: optimize if semops fail
Reduce the amount of scanning of the list of pending semaphore operations:
If try_atomic_semop failed, then no changes were applied. Thus no need to
restart.
Additionally, this patch correct an incorrect comment: It's possible to
wait for arbitrary semaphore values (do a dec by <x>, wait-for-zero, inc
by <x> in one atomic operation)
Both changes are from Nick Piggin, the patch is the result of a different
split of the individual changes.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Pierre Peiffer <peifferp@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/sem.h')
0 files changed, 0 insertions, 0 deletions