[Bug nptl/415] pthread_cancel does not unwind stack when thread is cancelled inside signal handler

["yufeng_xiong at ltx dot com" <sourceware-bugzilla at sources dot redhat dot com>]

------- Additional Comments From yufeng_xiong at ltx dot com  2004-10-04 13:42 -------
Deal Ulrich,

Here is more test results regarding pthread_cancel and pthread_exit cause thread
stack unwind (thread local objects be destructed) behavior on Linux:

1. With the default deferred cancellation: In thread normal execution, it works.
   If the thread is inside it's signal handler and get cancelled, it does not work.

2. If use asyncrhonous cancellation: both cases (thread get cancelled while in
it's normal execution or inside it's signal handler) don't work.

3. If use pthread_exit, both cases (call pthread_exit from it's normal execution
or from it's signal handler) works, and this is independent of the cancellation
type.

So clearly there are some mismatch in the behaviors, I would expect
pthread_cancel and pthread_exit should have the same behavior (just as far as
thread stack unwind behavior is concerned), and this behavior also should not
depend on the cancellation type with pthread_cancel.

Thanks very much.

Yufeng

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http://sources.redhat.com/bugzilla/show_bug.cgi?id=415

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