Managed to self-destruct pager.

Issues:
- A page-faulting thread suspends if receives -1 from pager page fault ipc.
  This is fine if pager is about to delete the thread, but it is not if
  it is a buggy pager.
- Need to find a way to completely get rid of suspended pager.
- A method of deleting suspended tasks could remedy both cases above.

include/l4/generic/tcb.h

@@ -28,6 +28,7 @@
 #define TASK_INTERRUPTED		(1 << 0)
 #define TASK_SUSPENDING			(1 << 1)
 #define TASK_RESUMING			(1 << 2)
+#define TASK_EXITING			(1 << 3)
 
 /* Task states */
 enum task_state {

include/l4/generic/thread.h

@@ -4,11 +4,14 @@
 #ifndef __THREAD_H__
 #define __THREAD_H__
 
+#include <l4/generic/tcb.h>
 
 /* Thread id creation and deleting */
 void thread_id_pool_init(void);
 int thread_id_new(void);
 int thread_id_del(int tid);
 
+void thread_destroy_self(void);
+int thread_destroy(struct task_ids *ids);
 
 #endif /* __THREAD_H__ */

include/l4/macros.h

@@ -91,6 +91,8 @@ static inline int is_err(int x)
 
 #define BUG_ON(x)		{if (x) BUG();}
 
+#define WARN_ON(x)	{if (x) printk("%s, %s, %s: Warning something is off here.\n", __FILE__, __FUNCTION__, __LINE__); }
+
 #define BUG_ON_MSG(msg, x)	do {				\
 					printk(msg);		\
 					BUG_ON(x)		\