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SubjectRe: Async IO
Followup to:  <>
By author: Andi Kleen <>
In newsgroup:
> One problem currently is that Linux doesn't have enough signals.
> In practive you can only use SIGUSR1 and SIGUSR2 for your async aio
> stuff and that's usually not enough. Linuxthreads already needs SIGUSR1
> so you can't use it. You'll probably have to wait for full POSIX 1003.1b
> signal support in Linux.

We probably should create a couple of more signals... SIGUNUSED (31)
is still available, SIGLOST (29) is commented out, signal number 0 is
unused, and SIGPWR (30) basically only makes sense to init(8). I
would suggest creating a SIGTHREAD reserved for Linuxthreads; that way
it wouldn't have to eat up a user signal...


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