patch-2.3.27 linux/arch/alpha/kernel/process.c
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- 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;
+}
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