[Ace-users] [ace-users] ACE_SOCK_Stream::recv_n() returns -1 if interrupted by signal

[Jules d'Entremont]

> >I don't have control over which signals are being used by the
> >application (I'm developing an SDK which is used by others).  In
fact,
> >in this case, the signal (SIGALRM) is used by the application, so it
> >can't be ignored.
>
> Assuming that you are running in an OS that supports the POSIX thread
> API, you should be able to block signals in the thread that does the
> read.  That should solve your problem.

No, that won't work.  The signal needs to be delivered, to the thread
that does the read, in a timely manner.  It can't be blocked.

> The problem with your suggested fix is that it breaks current
semantics.
> The easiest way to solve this is via the APIs that ACE supports that
> can block signals in a particular thread.  It would also be possible
> to parameterize ACE_SOCK_Stream so that it could conditionally ignore
> signals, but that will have broader side-effects.

How about providing a new function, or a flag to modify the behaviour of
one of the existing functions?

Jules.


> Take care,
>
>      Doug