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Re: debugging threaded apps. thread ID missing in corefile.
Date: Tue, 7 Jun 2005 09:10:22 -0400
From: Daniel Jacobowitz <drow@false.org>
> > Not really. The ID is a pointer above 0x80000000, used by the
> > implementation.
>
> Well, then perhaps we should display the thread ID in hex?
Hmm. I wouldn't object to this. The number is opaque to the user
code; for LinuxThreads it is an encoded index into an array (usually
between 0 and 64k; the first few threads are numbered around 32k and
16k). That looks plausible in hex or in decimal. For NPTL they are
pointers and would look more plausible in hex.
The number isn't really opaque to the user. The numbers have type
`pthread_t' and can be printed by the user when debugging his program.
It's the pthread_t type that is opaque. Ideally we'd use the the
`pthread_t' type for the formatting of these values. But AFAIC hex is
a good default.
Mark