1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/**
* @file
*
* @brief Function sets scheduling policy and parameters of the thread
* @ingroup POSIXAPI
*/
/*
* 13.5.2 Dynamic Thread Scheduling Parameters Access,
* P1003.1c/Draft 10, p. 124
*/
/* COPYRIGHT (c) 1989-2014.
* 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.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <errno.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/priorityimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
#include <rtems/config.h>
int pthread_setschedparam(
pthread_t thread,
int policy,
struct sched_param *param
)
{
Thread_Control *the_thread;
Per_CPU_Control *cpu_self;
POSIX_API_Control *api;
Thread_CPU_budget_algorithms budget_algorithm;
Thread_CPU_budget_algorithm_callout budget_callout;
int eno;
Priority_Control unused;
ISR_lock_Context lock_context;
Priority_Control new_priority;
/*
* Check all the parameters
*/
if ( param == NULL ) {
return EINVAL;
}
eno = _POSIX_Thread_Translate_sched_param(
policy,
param,
&budget_algorithm,
&budget_callout
);
if ( eno != 0 ) {
return eno;
}
the_thread = _Thread_Get( thread, &lock_context );
if ( the_thread == NULL ) {
return ESRCH;
}
/*
* Actually change the scheduling policy and parameters
*/
cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
_Thread_State_acquire_critical( the_thread, &lock_context );
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
if ( api->schedpolicy == SCHED_SPORADIC ) {
_Watchdog_Per_CPU_remove_relative( &api->Sporadic_timer );
}
api->schedpolicy = policy;
api->schedparam = *param;
api->Attributes.schedpolicy = policy;
api->Attributes.schedparam = *param;
the_thread->budget_algorithm = budget_algorithm;
the_thread->budget_callout = budget_callout;
switch ( policy ) {
case SCHED_OTHER:
case SCHED_FIFO:
case SCHED_RR:
the_thread->cpu_time_budget =
rtems_configuration_get_ticks_per_timeslice();
new_priority = _POSIX_Priority_To_core( api->schedparam.sched_priority );
break;
case SCHED_SPORADIC:
api->ss_high_priority = api->schedparam.sched_priority;
break;
}
_Thread_State_release( the_thread, &lock_context );
switch ( policy ) {
case SCHED_OTHER:
case SCHED_FIFO:
case SCHED_RR:
_Thread_Set_priority( the_thread, new_priority, &unused, false );
break;
case SCHED_SPORADIC:
_POSIX_Threads_Sporadic_budget_TSR( &api->Sporadic_timer );
break;
}
_Thread_Dispatch_enable( cpu_self );
return 0;
}
|
