[Linux-ia64] RT Timers problem

[Steve Woodruff <sjwoodr@yahoo.com>]

Hi - i've encountered a couple of different, but
maybe related problems in Debian linux on an RX2600
(ia64).  Maybe someone can comment if they've seen
this before?

1. RT signals RTMIN, RTMIN+1, RTMIN+2 are not being
   delivered.  I created a simple test case that sets
   an interval timer set to fire once per second, 
   but the signal never arrives!  When i use RTMIN+3
   or greater, then the code works fine.  I can 
   provide the test code to anyone who is interested
   in trying it out on their system.

2. In some cases, a call to timer_create() will block.
   This one is harder to reproduce, but i've done it
   multiple times and have something like this in 
   my code:

fprintf(stderr, 
  "HMM: Creating timer with signo=%d\n", 
  signal_no);
status =  timer_create(CLOCK_REALTIME,
  &h_event_struct, &h_timer_id);
fprintf(stderr, 
  "HMM: Timer created, status = %d\n", status);

And in the output, only the first line is
printed.  The timer_create() never returns!  I also
did a strace and the tail of that is:

write(2, "HMM: Creating timer with signo="..., 35HMM:
Creating timer with signo5
) = 35
getpid()                                = 591
getrlimit(RLIMIT_STACK, {rlim_curÅ92*1024,
rlim_max=RLIM_INFINITY}) = 0
brk(0)                                  0x600000000009c000
brk(0x60000000000a4000)                 0x60000000000a4000
pipe([2973872, 536870912])              = 4
SYS_1213(0x20000000000393a8, 0x60000000000988c0,
0x7fe0, 0xf00, 0x20000000002fc640, 0x20000000000393a8,
0x20000000002fc640, 0xf00) = 600
write(5, "\1\0\0\0\0\0\0\0\5\0\0\0\0\0\0\0pj-\0\0\0\0
\30\0\3\0\0"..., 168) = 168
rt_sigprocmask(SIG_SETMASK, NULL, [RT0], 8) = 0
write(5, "\200\300/\0\0\0\0
\0\0\0\0\0\0\0\0\10{\7\0\0\0\0 \10\257"..., 168) = 168
rt_sigprocmask(SIG_SETMASK, NULL, [RT0], 8) = 0
rt_sigsuspend([]

and there it sits.

Has anyone seen either of these problems come up
on debian linux/ia64? For what its worth, i was
using redhat AS back in January and the problems
never popped up back then, so i do think may be
specific to the librt provided in debian:
libc6.1-dev: /usr/lib/librt.so

Thanks,

/steve


==----------------------------------------------------------
 Steve Woodruff, N9OH @ 42.18N 88.34W, sjwoodr@yahoo.com

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