source: rtems/cpukit/score/src/threadtickletimeslice.c @ 014d541f

4.8
Last change on this file since 014d541f was c3330a8, checked in by Joel Sherrill <joel.sherrill@…>, on 05/17/07 at 22:46:45

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

  • 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.
  • Property mode set to 100644
File size: 2.1 KB
Line 
1/*
2 *  Thread Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in found in the file LICENSE in this distribution or at
10 *  http://www.rtems.com/license/LICENSE.
11 *
12 *  $Id$
13 */
14
15#if HAVE_CONFIG_H
16#include "config.h"
17#endif
18
19#include <rtems/system.h>
20#include <rtems/score/apiext.h>
21#include <rtems/score/context.h>
22#include <rtems/score/interr.h>
23#include <rtems/score/isr.h>
24#include <rtems/score/object.h>
25#include <rtems/score/priority.h>
26#include <rtems/score/states.h>
27#include <rtems/score/sysstate.h>
28#include <rtems/score/thread.h>
29#include <rtems/score/threadq.h>
30#include <rtems/score/userext.h>
31#include <rtems/score/wkspace.h>
32
33/*PAGE
34 *
35 *  _Thread_Tickle_timeslice
36 *
37 *  This scheduler routine determines if timeslicing is enabled
38 *  for the currently executing thread and, if so, updates the
39 *  timeslice count and checks for timeslice expiration.
40 *
41 *  Input parameters:   NONE
42 *
43 *  Output parameters:  NONE
44 */
45
46void _Thread_Tickle_timeslice( void )
47{
48  Thread_Control *executing;
49
50  executing = _Thread_Executing;
51
52  #ifndef RTEMS_ENABLE_NANOSECOND_CPU_USAGE_STATISTICS
53    /*
54     *  Increment the number of ticks this thread has been executing
55     */
56    executing->ticks_executed++;
57  #endif
58
59  /*
60   *  If the thread is not preemptible or is not ready, then
61   *  just return.
62   */
63
64  if ( !executing->is_preemptible )
65    return;
66
67  if ( !_States_Is_ready( executing->current_state ) )
68    return;
69
70  /*
71   *  The cpu budget algorithm determines what happens next.
72   */
73
74  switch ( executing->budget_algorithm ) {
75    case THREAD_CPU_BUDGET_ALGORITHM_NONE:
76      break;
77
78    case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE:
79    case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
80      if ( --executing->cpu_time_budget == 0 ) {
81        _Thread_Reset_timeslice();
82        executing->cpu_time_budget = _Thread_Ticks_per_timeslice;
83      }
84      break;
85
86    case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
87      if ( --executing->cpu_time_budget == 0 )
88        (*executing->budget_callout)( executing );
89      break;
90  }
91}
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