libthread_db thread handles

[Ulrich Drepper]

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Daniel Jacobowitz wrote:

> To find the state of a thread, we need to first get a thread handle for
> it and only then can we call td_thr_get_info.  I'd like to save a copy
> of the td_thrhandle_t when we get the TD_CREATE event,

The problem is calling the *_iter functions or so?

If you have the pthread_t value computing the td_thrhandle_t is an
operation which can be performed entirely without the looking at the
inferior.  At least in the new implementation.  Just call
td_ta_map_id2thr().  This shouldn't add any measurable overhead.

I would prefer you caching the pthread_t value very much over caching
any opaque data structure.  If this means adding a function
td_ta_map_thr2id() I'd have no problems with it.  But not even this
should be necessary since for both events, TD_CREATE and TD_DEATH, the
eventdata is the pthread_t value.  And this should be a documented
interface.

- -- 
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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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