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From: Jonathan Mini <mini@FreeBSD.org>
Subject: PERFORCE change 17249 for review
To: Perforce Change Reviews <perforce@freebsd.org>
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http://people.freebsd.org/~peter/p4db/chv.cgi?CH=17249

Change 17249 by mini@mini_stylus on 2002/09/08 18:44:25

	Thread-safe formatted printing.

Affected files ...

.. //depot/projects/kse/lib/libc_r/uthread/uthread_printf.c#1 add
.. //depot/projects/kse/sys/kern/kern_proc.c#83 edit

Differences ...

==== //depot/projects/kse/sys/kern/kern_proc.c#83 (text+ko) ====

@@ -293,6 +293,17 @@
 int
 kse_yield(struct thread *td, struct kse_yield_args *uap)
 {
+	struct thread *td2;
+
+	/* KSE-enabled processes only, please. */
+	if ((td->td_proc->p_flag & P_KSES) == 0)
+		return (EINVAL);
+
+	/* Don't discard the last thread. */
+	td2 = FIRST_THREAD_IN_PROC(td->td_proc);
+	KASSERT(td2 != NULL, ("kse_yield: no threads in our proc"));
+	if (TAILQ_NEXT(td, td_plist) == NULL)
+		return (EINVAL);
 
 	/* Abandon thread. */
 	PROC_LOCK(td->td_proc);

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