Re: [CHECKER] a couple potential deadlocks in 2.4.5-ac8

From: David Woodhouse (dwmw2@infradead.org)
Date: Sat Jun 09 2001 - 14:33:01 EST

torvalds@transmeta.com said:
> Good point. Spinlocks (with the exception of read-read locks, of
> course) and semaphores will deadlock on recursive use, while the BKL
> has this "process usage counter" recursion protection.

Obtaining a read lock twice can deadlock too, can't it?

        A B
        read_lock()
                        write_lock()
                        ...sleeps...
        read_lock()
        ...sleeps...

Or do we not make new readers sleep if there's a writer waiting? 

--
dwmw2

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This archive was generated by hypermail 2b29 : Fri Jun 15 2001 - 21:00:11 EST