In last setsid/tty locking changes...

[Marco Cipullo]

In last setsid/tty locking changes:

diff -Nru a/kernel/exit.c b/kernel/exit.c
--- a/kernel/exit.c	2005-01-07 05:24:41 -08:00
+++ b/kernel/exit.c	2005-01-07 05:24:41 -08:00
@@ -332,7 +332,9 @@
 	exit_mm(current);
 
 	set_special_pids(1, 1);
+	down(&tty_sem);
 	current->signal->tty = NULL;
+	up(&tty_sem);
 
 	/* Block and flush all signals */
 	sigfillset(&blocked);

Sorry for the silly question, but why is needed a semaphore to write just one 
value without read/write nothing else?

Bye
Marco
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