Some cleanups related to timecounters and weird ifdefs in <sys/time.h>.

Clean up (or if antipodic: down) some of the msgbuf stuff.

Use an inline function rather than a macro for timecounter delta.

Maintain process "on-cpu" time as 64 bits of microseconds to avoid
needless second rollover overhead.

Avoid calling microuptime the second time in mi_switch() if we do
not pass through _idle in cpu_switch()

This should reduce our context-switch overhead a bit, in particular
on pre-P5 and SMP systems.

WARNING:  Programs which muck about with struct proc in userland
will have to be fixed.

Reviewed, but found imperfect by:       bde

1 files changed, 9 insertions, 6 deletions

diff --git a/sys/sys/msgbuf.h b/sys/sys/msgbuf.h
index 2a153c8..4cfd004 100644
--- a/sys/sys/msgbuf.h
+++ b/sys/sys/msgbuf.h
@@ -31,27 +31,30 @@
  * SUCH DAMAGE.
  *
  *	@(#)msgbuf.h	8.1 (Berkeley) 6/2/93
- * $Id: msgbuf.h,v 1.9 1997/02/22 09:45:37 peter Exp $
+ * $Id: msgbuf.h,v 1.10 1998/05/19 08:58:35 phk Exp $
  */
 
 #ifndef _SYS_MSGBUF_H_
 #define _SYS_MSGBUF_H_
 
-#if defined(KERNEL) && !defined(MSGBUF_SIZE)
-#define	MSGBUF_SIZE	8192
-#endif
-
 struct	msgbuf {
 #define	MSG_MAGIC	0x063062
 	unsigned int	msg_magic;
-	unsigned int	msg_size;		/* MSG_BSIZE */
+	unsigned int	msg_size;		/* size of buffer area */
 	unsigned int	msg_bufx;		/* write pointer */
 	unsigned int	msg_bufr;		/* read pointer */
 	char * 		msg_ptr;		/* pointer to buffer */
 };
+
 #ifdef KERNEL
 extern int	msgbufmapped;
 extern struct	msgbuf *msgbufp;
+void	msgbufinit	__P((void *ptr, size_t size));
+
+#if !defined(MSGBUF_SIZE)
+#define	MSGBUF_SIZE	8192
+#endif
+
 #endif
 
 #endif