source: rtems/cpukit/posix/src/pthreadsetschedparam.c @ f26145b

4.104.114.84.95
Last change on this file since f26145b was 874297f3, checked in by Ralf Corsepius <ralf.corsepius@…>, on 04/16/04 at 10:01:03

Remove stray white spaces.
  • Property mode set to 100644
File size: 3.2 KB
Line 
1/*
2 *  13.5.2 Dynamic Thread Scheduling Parameters Access,
3 *         P1003.1c/Draft 10, p. 124
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 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 <pthread.h>
20#include <errno.h>
21
22#include <rtems/system.h>
23#include <rtems/posix/pthread.h>
24#include <rtems/posix/priority.h>
25#include <rtems/posix/time.h>
26
27int pthread_setschedparam(
28  pthread_t           thread,
29  int                 policy,
30  struct sched_param *param
31)
32{
33  register Thread_Control             *the_thread;
34  POSIX_API_Control                   *api;
35  Thread_CPU_budget_algorithms         budget_algorithm;
36  Thread_CPU_budget_algorithm_callout  budget_callout;
37  Objects_Locations                    location;
38
39  /*
40   *  Check all the parameters
41   */
42
43  if ( !param )
44    return EINVAL;
45
46  if ( !_POSIX_Priority_Is_valid( param->sched_priority ) )
47    return EINVAL;
48
49  budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
50  budget_callout = NULL;
51
52  switch ( policy ) {
53    case SCHED_OTHER:
54      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
55      break;
56
57    case SCHED_FIFO:
58      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
59      break;
60
61    case SCHED_RR:
62      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE;
63      break;
64
65    case SCHED_SPORADIC:
66      budget_algorithm  = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT;
67      budget_callout = _POSIX_Threads_Sporadic_budget_callout;
68
69      if ( _POSIX_Timespec_to_interval( &param->ss_replenish_period ) <
70           _POSIX_Timespec_to_interval( &param->ss_initial_budget ) )
71        return EINVAL;
72
73      if ( !_POSIX_Priority_Is_valid( param->ss_low_priority ) )
74        return EINVAL;
75
76      break;
77
78    default:
79      return EINVAL;
80  }
81
82  /*
83   *  Actually change the scheduling policy and parameters
84   */
85
86  the_thread = _POSIX_Threads_Get( thread, &location );
87  switch ( location ) {
88    case OBJECTS_ERROR:
89    case OBJECTS_REMOTE:
90      return ESRCH;
91    case OBJECTS_LOCAL:
92      api = the_thread->API_Extensions[ THREAD_API_POSIX ];
93
94      if ( api->schedpolicy == SCHED_SPORADIC )
95        (void) _Watchdog_Remove( &api->Sporadic_timer );
96
97      api->schedpolicy = policy;
98      api->schedparam  = *param;
99      the_thread->budget_algorithm = budget_algorithm;
100      the_thread->budget_callout   = budget_callout;
101
102      switch ( api->schedpolicy ) {
103        case SCHED_OTHER:
104        case SCHED_FIFO:
105        case SCHED_RR:
106          the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;
107
108          the_thread->real_priority =
109            _POSIX_Priority_To_core( api->schedparam.sched_priority );
110
111          _Thread_Change_priority(
112             the_thread,
113             the_thread->real_priority,
114             TRUE
115          );
116          break;
117
118        case SCHED_SPORADIC:
119          api->ss_high_priority = api->schedparam.sched_priority;
120          _Watchdog_Remove( &api->Sporadic_timer );
121          _POSIX_Threads_Sporadic_budget_TSR( 0, the_thread );
122          break;
123      }
124
125      _Thread_Enable_dispatch();
126      return 0;
127  }
128  return POSIX_BOTTOM_REACHED();
129}
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