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Operations that need access to the whole array must guarantee that there are no simple operations ongoing. Right now this is achieved by spin_unlock_wait(sem->lock) on all semaphores. If complex_count is nonzero, then this spin_unlock_wait() is not necessary, because it was already performed in the past by the thread that increased complex_count and even though sem_perm.lock was dropped inbetween, no simple operation could have started, because simple operations cannot start when complex_count is non-zero. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: Mike Galbraith <bitbucket@online.de> Cc: Rik van Riel <riel@redhat.com> Reviewed-by: Davidlohr Bueso <davidlohr@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| compat_mq.c | ||
| compat.c | ||
| ipc_sysctl.c | ||
| ipcns_notifier.c | ||
| Makefile | ||
| mq_sysctl.c | ||
| mqueue.c | ||
| msg.c | ||
| msgutil.c | ||
| namespace.c | ||
| sem.c | ||
| shm.c | ||
| syscall.c | ||
| util.c | ||
| util.h | ||