how to implement linux_gettid
marcel at xcllnt.net
Tue Jul 20 15:19:07 PDT 2004
On Tue, Jul 20, 2004 at 11:59:33PM +0200, Georg-W. Koltermann wrote:
> Am Mo, den 19.07.2004 schrieb Marcel Moolenaar um 23:58:
> > On Mon, Jul 19, 2004 at 11:47:15PM +0200, Georg-W. Koltermann wrote:
> > >
> > > Could someone explain how our threading works when accessed from Linux,
> > > and maybe give me a hint how gettid() should be implemented correctly?
> > It depends. If user threading under linux compatibility is still
> > implemented using fork(2), then you'll have a process per user thread.
> > In that case it doesn't matter how threading is natively implemented.
> I am not quite sure. I see that i386/linux/syscalls.master has fork,
> vfork, and clone. clone is implemented by calling fork1(). Does this
> make sure that Linux threading is implemented using fork()?
You want to look at what the threading library calls when it needs
to create a new thread. I think this will be clone(2) and if it is,
then threading is basicly implemented using fork(1) and the thread
IDs is the process ID.
> Or could it depend on the application or library layer, e.g. libpthread
> in linux_base?
Yes. See above.
Marcel Moolenaar USPA: A-39004 marcel at xcllnt.net
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