2007-05-17 Joel Sherrill <joel.sherrill@oarcorp.com>

	* ChangeLog, configure.ac, libcsupport/src/__times.c,
	libmisc/cpuuse/cpuuse.c, libmisc/stackchk/check.c,
	rtems/include/rtems/rtems/ratemon.h, rtems/src/ratemongetstatus.c,
	rtems/src/ratemonperiod.c, rtems/src/ratemonreportstatistics.c,
	rtems/src/ratemonresetall.c, rtems/src/ratemontimeout.c,
	score/Makefile.am, score/include/rtems/score/thread.h,
	score/include/rtems/score/timespec.h, score/src/threaddispatch.c,
	score/src/threadinitialize.c, score/src/threadtickletimeslice.c,
	score/src/timespecdivide.c: Add nanoseconds granularity to the rate
	monotonic period statistics and CPU usage statistics. This capability
	is enabled by default although may be conditionally disabled by the
	user. It could be too much overhead on small targets but it does not
	appear to be bad in early testing. Its impact on code size has not
	been evaluated either. It is possible that both forms of statistics
	gathering could be disabled with further tweaking of the conditional
	compilation.
	* score/src/timespecdividebyinteger.c: New file.

1 files changed, 52 insertions, 0 deletions

diff --git a/cpukit/score/src/timespecdividebyinteger.c b/cpukit/score/src/timespecdividebyinteger.c
new file mode 100644
index 0000000000..eecd7c4e30
--- /dev/null
+++ b/cpukit/score/src/timespecdividebyinteger.c
@@ -0,0 +1,52 @@
+/** 
+ *  @file  score/src/timespecdividebyinteger.c
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <sys/types.h>
+#include <rtems/score/timespec.h>
+#include <rtems/score/tod.h>
+
+void _Timespec_Divide_by_integer(
+  const struct timespec *time,
+  uint32_t               iterations,
+  struct timespec       *result
+)
+{
+  uint64_t t;
+
+  /*
+   *  For math simplicity just convert the timespec to nanoseconds
+   *  in a 64-bit integer.
+   */
+  t  = time->tv_sec * TOD_NANOSECONDS_PER_SECOND;
+  t += time->tv_nsec;
+
+  /*
+   *  Divide to get nanoseconds per iteration
+   */
+
+  t /= iterations;
+
+  /*
+   *  Put it back in the timespec result
+   */
+
+  result->tv_sec  = t / TOD_NANOSECONDS_PER_SECOND;
+  result->tv_nsec = t % TOD_NANOSECONDS_PER_SECOND;
+}