source: rtems/cpukit/score/src/threadtickletimeslice.c @ dca9a82

4.104.11
Last change on this file since dca9a82 was dca9a82, checked in by Glenn Humphrey <glenn.humphrey@…>, on Dec 2, 2009 at 6:22:19 PM

2009-12-02 Glenn Humphrey <glenn.humphrey@…>

  • libcsupport/src/times.c, libmisc/cpuuse/cpuusagedata.c, libmisc/cpuuse/cpuusagereport.c, libmisc/cpuuse/cpuusagereset.c, rtems/include/rtems/rtems/types.h, rtems/src/ratemongetstatistics.c, rtems/src/ratemonreportstatistics.c, score/src/threaddispatch.c, score/src/threadinitialize.c, score/src/threadtickletimeslice.c: Updated copyright line.
  • Property mode set to 100644
File size: 2.2 KB
Line 
1/*
2 *  Thread Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-2009.
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  #ifdef __RTEMS_USE_TICKS_FOR_STATISTICS__
53    /*
54     *  Increment the number of ticks this thread has been executing
55     */
56    executing->cpu_time_used++;
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    #if defined(RTEMS_SCORE_THREAD_ENABLE_EXHAUST_TIMESLICE)
80      case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
81    #endif
82      if ( (int)(--executing->cpu_time_budget) <= 0 ) {
83        _Thread_Reset_timeslice();
84        executing->cpu_time_budget = _Thread_Ticks_per_timeslice;
85      }
86      break;
87
88    #if defined(RTEMS_SCORE_THREAD_ENABLE_SCHEDULER_CALLOUT)
89      case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
90        if ( --executing->cpu_time_budget == 0 )
91          (*executing->budget_callout)( executing );
92        break;
93    #endif
94  }
95}
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