Re: [patch] O(1) sys_exit(), threading, scalable-exit-2.5.31-A6

From: Ingo Molnar (mingo@elte.hu)
Date: Tue Aug 20 2002 - 09:36:19 EST

the attached patch ontop of BK-curr fixes the ptrace wait4() anomaly that
can be observed in any previous Linux kernel i could get my hands at. So
in fact ->ptrace_children, besides being a speedup, also fixed a bug that
couldnt be fixed in any satisfactory way before.

        Ingo

--- linux/kernel/exit.c.orig Tue Aug 20 16:28:57 2002
+++ linux/kernel/exit.c Tue Aug 20 16:30:13 2002
@@ -731,7 +731,7 @@
                 tsk = next_thread(tsk);
         } while (tsk != current);
         read_unlock(&tasklist_lock);
- if (flag) {
+ if (flag || !list_empty(&current->ptrace_children)) {
                 retval = 0;
                 if (options & WNOHANG)
                         goto end_wait4;

-
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This archive was generated by hypermail 2b29 : Fri Aug 23 2002 - 22:00:20 EST