Messages in this thread | | | Date | Fri, 11 Jun 1999 19:46:41 +0530 (IST) | From | V Ganesh <> | Subject | Re: New semaphore __wake_up() implementation ... |
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> I think we should wakeup the last process that gone to sleep even in the > up() case. We should simple ask for an EXCLUSIVE wakeup.
wait a sec, what about starvation issues ? if the semaphore is used for resource counting then it's ok. but if it is used as a mutex then we're in trouble. LIFO is unacceptable, FIFO might have priority inversion. calculating goodness() on all the processes in the waitqueue and picking the winner sounds like the way to go, IMHO.
ganesh
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