source: rtems/cpukit/score/src/schedulercbsreleasejob.c @ 82db8e56

4.115
Last change on this file since 82db8e56 was 82db8e56, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 15, 2011 at 3:49:32 PM

2011-09-15 Petr Benes <benesp16@…>

PR 1906/cpukit

  • sapi/Makefile.am, sapi/preinstall.am, sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add the CBS (Constant Bandwidth Server) scheduler. This is a complex scheduling policy built atop of the EDF scheduler. Unlike other schedulers, this one provides a user API and handles not only deadlines of tasks but also claimed budget per period. The main aim of the scheduler is isolation of tasks so that each task is guaranteed to meet all deadlines regardless of how other tasks behave.
  • sapi/include/rtems/cbs.h, sapi/inline/rtems/cbs.inl, score/include/rtems/score/schedulercbs.h, score/src/schedulercbs.c, score/src/schedulercbsattachthread.c, score/src/schedulercbscleanup.c, score/src/schedulercbscreateserver.c, score/src/schedulercbsdestroyserver.c, score/src/schedulercbsdetachthread.c, score/src/schedulercbsgetapprovedbudget.c, score/src/schedulercbsgetexecutiontime.c, score/src/schedulercbsgetparameters.c, score/src/schedulercbsgetremainingbudget.c, score/src/schedulercbsgetserverid.c, score/src/schedulercbsreleasejob.c, score/src/schedulercbssetparameters.c, score/src/schedulercbsunblock.c: New files.
  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2 *  Copyright (C) 2011 Petr Benes.
3 *  Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
4 *
5 *  The license and distribution terms for this file may be
6 *  found in the file LICENSE in this distribution or at
7 *  http://www.rtems.com/license/LICENSE.
8 *
9 *  $Id$
10 */
11
12#if HAVE_CONFIG_H
13#include "config.h"
14#endif
15
16#include <rtems/system.h>
17#include <rtems/config.h>
18#include <rtems/score/scheduler.h>
19#include <rtems/score/schedulercbs.h>
20
21void _Scheduler_CBS_Release_job(
22  Thread_Control    *the_thread,
23  uint32_t           deadline
24)
25{
26  Priority_Control new_priority;
27  Scheduler_CBS_Per_thread *sched_info =
28    (Scheduler_CBS_Per_thread *) the_thread->scheduler_info;
29  Scheduler_CBS_Server *serv_info =
30    (Scheduler_CBS_Server *) sched_info->cbs_server;
31
32  if (deadline) {
33    /* Initializing or shifting deadline. */
34    if (serv_info && serv_info->parameters.budget)
35      new_priority = (_Watchdog_Ticks_since_boot + serv_info->parameters.deadline)
36        & ~SCHEDULER_EDF_PRIO_MSB;
37    else
38      new_priority = (_Watchdog_Ticks_since_boot + deadline)
39        & ~SCHEDULER_EDF_PRIO_MSB;
40  }
41  else {
42    /* Switch back to background priority. */
43    new_priority = the_thread->Start.initial_priority;
44  }
45
46  /* Budget replenishment for the next job. */
47  if (serv_info && serv_info->parameters.budget)
48    the_thread->cpu_time_budget = serv_info->parameters.budget;
49
50  the_thread->real_priority = new_priority;
51  _Thread_Change_priority(the_thread, new_priority, true);
52}
Note: See TracBrowser for help on using the repository browser.