Re: About I/O callbacks ...

[Davide Libenzi]

On 22-Jun-2001 Andi Kleen wrote:
> On Fri, Jun 22, 2001 at 08:55:00AM -0700, Davide Libenzi wrote:
>> I know about rt signals and SIGIO :) but I can't see how You can queue
>> signals :
>> 
>> current->sig->action[..]
>> 
>> The action field is an array so if more than one I/O notification is fired
>> before the SIGIO is delivered, You'll deliver only the last one.
>> Am I missing something ?
> 
> Yes. Realtime signals (>=SIGRTMIN) get queued in current->pending.

An issue with rt signal is the limited number of this resource that
will force you to have a mapping  fd ==> coroutine  but this should not be a
big problem using  hash( fd ) = fd

- Davide