>I'm having problems to debug my multithread program :( on my IRIX 6.5 box.
>
>I have written this simple example and linked to -lpthread and I got the
>same problem.
>
>#include <stdio.h>
>int main () {
> printf ("Hello World\n");
> return 0;
>}
>
>$ gcc hello.c -lpthread
>$ gdb a.out
>(gdb) run
>Starting program: /usr/people/alex/a.out
>warning: Signal ? does not exist on this system.
Get latest gdb (or at least 5.1). The higher signal
numbers are available there.
signals above 32 from /usr/include/sys/signal.h:
#define SIGCKPT 33 /* Checkpoint warning */
#define SIGRESTART 34 /* Restart warning */
#define SIGUME 35 /* Uncorrectable memory error */
/* Signals defined for Posix 1003.1c. */
#define SIGPTINTR 47
#define SIGPTRESCHED 48
/* Posix 1003.1b signals */
#define SIGRTMIN 49 /* Posix 1003.1b signals */
#define SIGRTMAX 64 /* Posix 1003.1b signals */
47 and 48 are used by pthreads...
However, that is *not* going to help you debug a pthreads app
on IRIX6.5. To debug pthreads apps on IRIX6.5 requires
extensive use of libspypt.so by the debugger at
debugger-runtime and at present gdb has no support for that at
all I believe.
The notion here is that libspypt.so 'goes with the kernel' so
debuggers have a consistent interface to pthreads information
even though pthreads internals can change across releases.
The IRIX6.5 pthreads implementation is *totally* different
than IRIX6.4-and-earlier pthreads.
To get fully correct pthreads semantics required a new
implementation, I was told.
We've not made the information on libspypt.so (the info on
controlling a pthreads app with a debugger) available, but that
is mainly an oversight. If someone wants to take the time to
implement support in gdb I believe we would provide the
necessary information at no charge (we have done so
before). It's not a secret, it just never got documented
publically and the headers necessary have still not gotten into
the IRIX release :-(
Sorry. At present the only practical tools for IRIX6.5 pthreads
are dbx and WorkShop. WorkShop (gui debugger) is not free...
And for best pthreads debugging one _really_ wants the absolute
_most recent WorkShop patch version.
(Ah. TotalView from Etnus
is another IRIX6.5 pthreads-aware debugger.)
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