patch-2.3.27 linux/arch/alpha/kernel/process.c

• Lines: 36
• Date: Mon Nov 8 14:28:34 1999
• Orig file: v2.3.26/linux/arch/alpha/kernel/process.c
• Orig date: Tue Aug 31 17:29:12 1999

diff -u --recursive --new-file v2.3.26/linux/arch/alpha/kernel/process.c linux/arch/alpha/kernel/process.c
@@ -406,3 +406,35 @@
 	unlock_kernel();
 	return error;
 }
+
+/*
+ * These bracket the sleeping functions..
+ */
+extern void scheduling_functions_start_here(void);
+extern void scheduling_functions_end_here(void);
+#define first_sched	((unsigned long) scheduling_functions_start_here)
+#define last_sched	((unsigned long) scheduling_functions_end_here)
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long schedule_frame;
+	unsigned long pc;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+	/*
+	 * This one depends on the frame size of schedule().  Do a
+	 * "disass schedule" in gdb to find the frame size.  Also, the
+	 * code assumes that sleep_on() follows immediately after
+	 * interruptible_sleep_on() and that add_timer() follows
+	 * immediately after interruptible_sleep().  Ugly, isn't it?
+	 * Maybe adding a wchan field to task_struct would be better,
+	 * after all...
+	 */
+
+	pc = thread_saved_pc(&p->thread);
+	if (pc >= first_sched && pc < last_sched) {
+		schedule_frame = ((unsigned long *)p->thread.ksp)[6];
+		return ((unsigned long *)schedule_frame)[12];
+	}
+	return pc;
+}