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authorManfred Spraul <manfred@colorfullife.com>2009-12-16 00:47:32 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 15:20:10 (GMT)
commitb97e820ffffbf49e94ed60c9c26f1a54bccae924 (patch)
tree195146c43d24051aada20a211f2bb146bfebe9d2 /block
parentb6e90822e77cd476c18410f7003197d466e36ac6 (diff)
downloadlinux-fsl-qoriq-b97e820ffffbf49e94ed60c9c26f1a54bccae924.tar.xz
ipc/sem.c: add a per-semaphore pending list
Based on Nick's findings: sysv sem has the concept of semaphore arrays that consist out of multiple semaphores. Atomic operations that affect multiple semaphores are supported. The patch is the first step for optimizing simple, single semaphore operations: In addition to the global list of all pending operations, a 2nd, per-semaphore list with the simple operations is added. Note: this patch does not make sense by itself, the new list is used nowhere. 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>
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