Re: [ECOS] Wake select() with a signal

[Roland Caßebohm <roland dot cassebohm at visionsystems dot de>]

On Mittwoch, 6. November 2002 18:13, Nick Garnett wrote:
> In Unix I suppose one way of fixing this would have been to add a pipe
> to the set of read FDs and have the other thread write to that to wake
> the select() -- you probably don't need to use a signal at all. We do
> not have pipes in eCos, but a loop-back TCP socket would probably do
> the same thing.
>
> The POSIX-200X standard has added a pselect() call, which takes an
> additional signal mask argument, specifically to allow this race
> condition to be eliminated.

You are right, this will be a general problem for me. Till now I never had the 
race condition if the signal comes just before calling select(), but I think 
this is only, because my application waits most of the time in the select().
To be sure that my application work always, I have to use one of the solutions 
you have written.

I'm thinking of implementing a pselect() call. Where should this function be 
located, in packages/compat/posix or in packages/io/fileio?

Roland


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