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/*
 *  13.5.2 Dynamic Thread Scheduling Parameters Access,
 *         P1003.1c/Draft 10, p. 124
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: pthreadsetschedparam.c,v 1.2 2001-09-27 11:59:17 chris Exp $
 */
 
 
#include <pthread.h>
#include <errno.h>
 
#include <rtems/system.h>
#include <rtems/posix/pthread.h>
#include <rtems/posix/priority.h>
#include <rtems/posix/time.h>
 
int pthread_setschedparam(
  pthread_t           thread,
  int                 policy,
  struct sched_param *param
)
{
  register Thread_Control             *the_thread;
  POSIX_API_Control                   *api;
  Thread_CPU_budget_algorithms         budget_algorithm;
  Thread_CPU_budget_algorithm_callout  budget_callout;
  Objects_Locations                    location;
 
  /*
   *  Check all the parameters
   */
 
  if ( !param )
    return EINVAL;
 
  if ( !_POSIX_Priority_Is_valid( param->sched_priority ) )
    return EINVAL;
 
  budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
  budget_callout = NULL;
 
  switch ( policy ) {
    case SCHED_OTHER:
      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
      break;
 
    case SCHED_FIFO:
      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
      break;
 
    case SCHED_RR:
      budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE;
      break;
 
    case SCHED_SPORADIC:
      budget_algorithm  = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT;
      budget_callout = _POSIX_Threads_Sporadic_budget_callout;
 
      if ( _POSIX_Timespec_to_interval( &param->ss_replenish_period ) <
           _POSIX_Timespec_to_interval( &param->ss_initial_budget ) )
        return EINVAL;
 
      if ( !_POSIX_Priority_Is_valid( param->ss_low_priority ) )
        return EINVAL;
 
      break;
 
    default:
      return EINVAL;
  }
 
  /*
   *  Actually change the scheduling policy and parameters
   */
 
  the_thread = _POSIX_Threads_Get( thread, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
    case OBJECTS_REMOTE:
      return ESRCH;
    case OBJECTS_LOCAL:
      api = the_thread->API_Extensions[ THREAD_API_POSIX ];
 
      if ( api->schedpolicy == SCHED_SPORADIC )
        (void) _Watchdog_Remove( &api->Sporadic_timer );
 
      api->schedpolicy = policy;
      api->schedparam  = *param;
      the_thread->budget_algorithm = budget_algorithm;
      the_thread->budget_callout   = budget_callout;
 
      switch ( api->schedpolicy ) {
        case SCHED_OTHER:
        case SCHED_FIFO:
        case SCHED_RR:
          the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;
 
          the_thread->real_priority =
            _POSIX_Priority_To_core( api->schedparam.sched_priority );
 
          _Thread_Change_priority(
             the_thread,
             the_thread->real_priority,
             TRUE
          );
          break;
 
        case SCHED_SPORADIC:
          api->ss_high_priority = api->schedparam.sched_priority;
          _Watchdog_Remove( &api->Sporadic_timer );
          _POSIX_Threads_Sporadic_budget_TSR( 0, the_thread );
          break;
      }
 
      _Thread_Enable_dispatch();
      return 0;
  }
  return POSIX_BOTTOM_REACHED();
}

Line No.	Rev	Author	Line
1	158	chris	`/*`
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.OARcorp.com/rtems/license.html.`
11			`*`
12	208	chris	`* $Id: pthreadsetschedparam.c,v 1.2 2001-09-27 11:59:17 chris Exp $`
13	158	chris	`*/`
14
15
16			`#include <pthread.h>`
17			`#include <errno.h>`
18
19			`#include <rtems/system.h>`
20			`#include <rtems/posix/pthread.h>`
21			`#include <rtems/posix/priority.h>`
22			`#include <rtems/posix/time.h>`
23
24			`int pthread_setschedparam(`
25			`pthread_t thread,`
26			`int policy,`
27			`struct sched_param *param`
28			`)`
29			`{`
30			`register Thread_Control *the_thread;`
31			`POSIX_API_Control *api;`
32			`Thread_CPU_budget_algorithms budget_algorithm;`
33			`Thread_CPU_budget_algorithm_callout budget_callout;`
34			`Objects_Locations location;`
35
36			`/*`
37			`* Check all the parameters`
38			`*/`
39
40			`if ( !param )`
41			`return EINVAL;`
42
43			`if ( !_POSIX_Priority_Is_valid( param->sched_priority ) )`
44			`return EINVAL;`
45
46			`budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;`
47			`budget_callout = NULL;`
48
49			`switch ( policy ) {`
50			`case SCHED_OTHER:`
51			`budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;`
52			`break;`
53
54			`case SCHED_FIFO:`
55			`budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;`
56			`break;`
57
58			`case SCHED_RR:`
59			`budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE;`
60			`break;`
61
62			`case SCHED_SPORADIC:`
63			`budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT;`
64			`budget_callout = _POSIX_Threads_Sporadic_budget_callout;`
65
66			`if ( _POSIX_Timespec_to_interval( &param->ss_replenish_period ) <`
67			`_POSIX_Timespec_to_interval( &param->ss_initial_budget ) )`
68			`return EINVAL;`
69
70			`if ( !_POSIX_Priority_Is_valid( param->ss_low_priority ) )`
71			`return EINVAL;`
72
73			`break;`
74
75			`default:`
76			`return EINVAL;`
77			`}`
78
79			`/*`
80			`* Actually change the scheduling policy and parameters`
81			`*/`
82
83			`the_thread = _POSIX_Threads_Get( thread, &location );`
84			`switch ( location ) {`
85			`case OBJECTS_ERROR:`
86			`case OBJECTS_REMOTE:`
87			`return ESRCH;`
88			`case OBJECTS_LOCAL:`
89			`api = the_thread->API_Extensions[ THREAD_API_POSIX ];`
90
91			`if ( api->schedpolicy == SCHED_SPORADIC )`
92			`(void) _Watchdog_Remove( &api->Sporadic_timer );`
93
94			`api->schedpolicy = policy;`
95			`api->schedparam = *param;`
96			`the_thread->budget_algorithm = budget_algorithm;`
97			`the_thread->budget_callout = budget_callout;`
98
99			`switch ( api->schedpolicy ) {`
100			`case SCHED_OTHER:`
101			`case SCHED_FIFO:`
102			`case SCHED_RR:`
103			`the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;`
104
105			`the_thread->real_priority =`
106			`_POSIX_Priority_To_core( api->schedparam.sched_priority );`
107
108			`_Thread_Change_priority(`
109			`the_thread,`
110			`the_thread->real_priority,`
111			`TRUE`
112			`);`
113			`break;`
114
115			`case SCHED_SPORADIC:`
116			`api->ss_high_priority = api->schedparam.sched_priority;`
117			`_Watchdog_Remove( &api->Sporadic_timer );`
118			`_POSIX_Threads_Sporadic_budget_TSR( 0, the_thread );`
119			`break;`
120			`}`
121
122			`_Thread_Enable_dispatch();`
123			`return 0;`
124			`}`
125			`return POSIX_BOTTOM_REACHED();`
126			`}`

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