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

4.115
Last change on this file since 82db8e56 was 82db8e56, checked in by Joel Sherrill <joel.sherrill@…>, on 09/15/11 at 15:49:32

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
21int _Scheduler_CBS_Get_execution_time (
22  Scheduler_CBS_Server_id   server_id,
23  time_t                   *exec_time,
24  time_t                   *abs_time
25)
26{
27  Objects_Locations location;
28  Thread_Control *the_thread;
29
30  if ( server_id < 0 || server_id >= _Scheduler_CBS_Maximum_servers )
31    return SCHEDULER_CBS_ERROR_INVALID_PARAMETER;
32  if ( !_Scheduler_CBS_Server_list[server_id] )
33    return SCHEDULER_CBS_ERROR_NOSERVER;
34  if ( !_Scheduler_CBS_Server_list[server_id]->task_id ) {
35    *exec_time = 0;
36    return SCHEDULER_CBS_OK;
37  }
38
39  the_thread = _Thread_Get(
40                 _Scheduler_CBS_Server_list[server_id]->task_id,
41                 &location
42               );
43  /* The routine _Thread_Get may disable dispatch and not enable again. */
44  if ( the_thread ) {
45    _Thread_Enable_dispatch();
46    *exec_time = _Scheduler_CBS_Server_list[server_id]->parameters.budget -
47      the_thread->cpu_time_budget;
48  }
49  else {
50    *exec_time = _Scheduler_CBS_Server_list[server_id]->parameters.budget;
51  }
52  return SCHEDULER_CBS_OK;
53}
Note: See TracBrowser for help on using the repository browser.