Messages in this thread |  | | Date | Mon, 20 Aug 2001 14:30:52 -0500 | From | Dave McCracken <> | Subject | Re: [PATCH] 2.4.9 Make thread group id visible in /proc/<pid>/status |
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--On Monday, August 20, 2001 19:09:16 +0000 Miquel van Smoorenburg <miquels@cistron-office.nl> wrote:
> Hmm, I've always been a bit curious about this .. I don't think getpid() > should return tgid instead of pid. It looks broken to me. Thread groups > are a good idea, but they should act more like process groups do. > Switching pid and tgid is something that the LinuxThreads library > should probably do, but not the kernel. IMHO. > > If one really wants CLONE_PID to work, fix CLONE_PID.
I wasn't on the list when getpid() was changed to return tgid. I don't have a strong feeling about it, though it does make pthread semantics simpler.
CLONE_PID really isn't the semantic we want, though. That would make all tasks in the process have the same pid, and no way to address a specific task. We'd have to introduce something like a task id or a thread id. Having tgid and pid gives us the tools we need, and minimizes the compatibility issues.
Dave McCracken
====================================================================== Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059 dmccr@us.ibm.com T/L 678-3059
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