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

David Woodhouse (dwmw2@infradead.org)
Sat, 09 Jun 2001 20:33:01 +0100

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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