Date: Thu, 12 Jul 2001 14:11:54 -0700 From: Jason Evans <jasone@canonware.com> To: "Arno J. Klaassen" <arno@heho.snv.jussieu.fr> Cc: freebsd-stable@FreeBSD.ORG, Daniel Eischen <eischen@vigrid.com> Subject: Re: Changed behaviour of pthread_join (bug?) Message-ID: <20010712141154.O22464@canonware.com> In-Reply-To: <wpbsmqq93z.fsf@heho.snv.jussieu.fr>; from arno@heho.snv.jussieu.fr on Thu, Jul 12, 2001 at 08:45:52PM %2B0200 References: <wpbsmqq93z.fsf@heho.snv.jussieu.fr>
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Attached is a patch for -stable that should fix the problem your test
exposes, as well as a problem that your actual program might hit (canceled
threads should not detach). I also noticed and hopefully fixed a problem
with canceling a thread suspended while joining, but you probably don't do
that. =)
Please give the patch a try and let me know if it works for you.
Thanks,
Jason
P.S. Dan Eischen provided the bulk of this fix. Thanks Dan!
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Index: uthread_cancel.c
===================================================================
RCS file: /home/ncvs/src/lib/libc_r/uthread/uthread_cancel.c,v
retrieving revision 1.3.2.3
diff -u -r1.3.2.3 uthread_cancel.c
--- uthread_cancel.c 2001/06/23 00:47:05 1.3.2.3
+++ uthread_cancel.c 2001/07/12 20:59:13
@@ -59,9 +59,23 @@
break;
case PS_JOIN:
+ /*
+ * Disconnect the thread from the joinee and
+ * detach:
+ */
+ if (pthread->data.thread != NULL) {
+ pthread->data.thread->joiner = NULL;
+ pthread_detach((pthread_t)
+ pthread->data.thread);
+ }
+ pthread->cancelflags |= PTHREAD_CANCELLING;
+ PTHREAD_NEW_STATE(pthread, PS_RUNNING);
+ break;
+
case PS_SUSPENDED:
if (pthread->suspended == SUSP_NO ||
pthread->suspended == SUSP_YES ||
+ pthread->suspended == SUSP_JOIN ||
pthread->suspended == SUSP_NOWAIT) {
/*
* This thread isn't in any scheduling
@@ -180,7 +194,6 @@
*/
_thread_run->cancelflags &= ~PTHREAD_CANCELLING;
_thread_exit_cleanup();
- pthread_detach((pthread_t)_thread_run);
pthread_exit(PTHREAD_CANCELED);
PANIC("cancel");
}
@@ -211,7 +224,6 @@
if ((_thread_run->cancelflags & PTHREAD_CANCEL_NEEDED) != 0) {
_thread_run->cancelflags &= ~PTHREAD_CANCEL_NEEDED;
_thread_exit_cleanup();
- pthread_detach((pthread_t)_thread_run);
pthread_exit(PTHREAD_CANCELED);
}
}
Index: uthread_join.c
===================================================================
RCS file: /home/ncvs/src/lib/libc_r/uthread/uthread_join.c,v
retrieving revision 1.12.2.3
diff -u -r1.12.2.3 uthread_join.c
--- uthread_join.c 2001/07/05 16:04:09 1.12.2.3
+++ uthread_join.c 2001/07/12 20:30:29
@@ -119,6 +119,9 @@
/* Set the running thread to be the joiner: */
pthread->joiner = _thread_run;
+ /* Keep track of which thread we're joining to: */
+ _thread_run->data.thread = pthread;
+
/* Schedule the next thread: */
_thread_kern_sched_state(PS_JOIN, __FILE__, __LINE__);
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