From: Richard Braun <rbr...@sceen.net> To: Thomas DiModica <ricinw...@yahoo.com> Cc: "debian-h...@lists.debian.org" <debian-h...@lists.debian.org>; "bdefre...@debian.org" <bdefre...@debian.org> Sent: Tuesday, July 31, 2012 4:48 PM Subject: Re: Hurd_condition_wait in glibc libpthreads in Debian
On Tue, Jul 31, 2012 at 03:16:05PM -0700, Thomas DiModica wrote: > As an aside, Vicente Ara (zenton) actually wrote the pthread > hurd_condition_wait. > For the provenance of this file, see the thread: > http://lists.gnu.org/archive/html/bug-hurd/2002-11/msg00195.html My understanding is that pthread_cond_wait is a cancellation point, which means if a cancellation actually happens there, cleanup routines will be called, and the thread will exit instead of returning to the caller, which is of course *not* what we want here. We want hurd_condition_wait to report to the caller that it was cancelled, nothing more. -- Richard Braun ----- Original Message ----- That would be my understanding, too. Well, it is still a cancellation point, but for a different kind of cancellation. I think that "RPC interruption" would be a better way to describe it. And my understanding is also that that is what Vicente's function does. Most of what I understand is from what Marcus has to say in this thread here: http://lists.gnu.org/archive/html/hurd-devel/2002-07/msg00010.html My understanding is that hurd_condition_wait is used with hurd_thread_cancel in libc, as libc uses a different cancellation semantics than is provided by POSIX in pthreads. I'm going to cross-post this bug-hurd, so that if I am wrong, someone there will straighten me out. Thomas D
