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Subject[PATCH] Prevent reuse of active thread group id

The thread group id of a task is initially assigned the value of that
task's pid, then is inherited for each child task created with
CLONE_THREAD. This patch makes sure that the thread group id is never
re-used as another task's pid as long as there's an active task with that
tgid.

Patch is below.

Dave McCracken

======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059

====================

--- linux-2.4.9/./kernel/fork.c Tue Jul 17 20:23:28 2001
+++ linux-2.4.9-tgid/./kernel/fork.c Mon Aug 20 10:28:22 2001
@@ -101,6 +101,7 @@
for_each_task(p) {
if(p->pid == last_pid ||
p->pgrp == last_pid ||
+ p->tgid == last_pid ||
p->session == last_pid) {
if(++last_pid >= next_safe) {
if(last_pid & 0xffff8000)
-
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