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6ae7f6879f
Ingo suggestions: instead of having one global sem_undo list, we now have two local list, one per semaphore set and one per team which is held in its xsi_sem_context structure, along with a mutex. A mutex has also been added to the semaphore set class in order to protect the local list, but also in order to (hopefully) improve concurrency. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26993 a95241bf-73f2-0310-859d-f6bbb57e9c96