From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jonathan Larmour <jlarmour@redhat.com>
To: "Boris V. Guzhov" <borg@int.spb.ru>
Cc: ecos-discuss@sourceware.cygnus.com
Subject: Re: [ECOS] select() and signal's
Date: Fri, 20 Apr 2001 06:57:00 -0000
Message-id: <3AE0404E.B3BE865C@redhat.com>
References: <01b701c0c996$c29891f0$7601a8c0@borg>
X-SW-Source: 2001-04/msg00264.html

"Boris V. Guzhov" wrote:
> 
> Hi,
> 
> Are there any way in eCos to interrupt the select() blocking
> through a sending of a any signal?
> 
> For instance:
> 
> // posix thread 1:
> void *thr1(void *par)
> {
>   struct sigaction sa;
>   sigset_t mask;
> 
>   sigemptyset( &mask );
>   sigaddset( &mask, SIGRTMIN );
>   pthread_sigmask( SIG_UNBLOCK, &mask, 0 );
> 
>   sigemptyset( &sa.sa_mask );
>   sa.sa_flags = SA_SIGINFO;
>   sa.sa_sigaction = my_sig_handler;
>   sigaction( SIGTRTMIN, &sa, NULL);
> 
>   fd_set rfds;
>   int retval;
> 
>   FD_ZERO(&rfds);
>   FD_SET(0, &rfds);
>   retval = select(1, &rfds, NULL, NULL, NULL);
>   if ( retval < 0 )
>     perror("select:");
>  ...
> }
> 
> // posix thread 2:
> void *thr2(void *par)
> {
> ...
>   pthread_kill( th1, SIGRTMIN) ;
> ...
> }
> 
> In Linux it works, but in eCos it not works.

It is meant to work in eCos. It's meant to return -1 and set errno to
EINTR. Are you sure thr1 isn't being pre-empted for any other reason, e.g.
if thr2 is higher priority.

Try setting a breakpoint on the function cyg_sigqueue and debugging it.

jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine