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
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreSchedulerCBS
*
* @brief This source file contains the implementation of
* _Scheduler_CBS_Unblock().
*/
/*
* Copyright (C) 2011 Petr Benes.
* Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/schedulercbsimpl.h>
#include <rtems/score/scheduleredfimpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
void _Scheduler_CBS_Unblock(
const Scheduler_Control *scheduler,
Thread_Control *the_thread,
Scheduler_Node *node
)
{
Scheduler_CBS_Node *the_node;
Scheduler_CBS_Server *serv_info;
Priority_Control priority;
the_node = _Scheduler_CBS_Node_downcast( node );
serv_info = the_node->cbs_server;
priority = _Scheduler_Node_get_priority( &the_node->Base.Base );
priority = SCHEDULER_PRIORITY_PURIFY( priority );
/*
* Late unblock rule for deadline-driven tasks. The remaining time to
* deadline must be sufficient to serve the remaining computation time
* without increased utilization of this task. It might cause a deadline
* miss of another task.
*/
if ( serv_info != NULL && ( priority & SCHEDULER_EDF_PRIO_MSB ) == 0 ) {
time_t deadline = serv_info->parameters.deadline;
time_t budget = serv_info->parameters.budget;
uint32_t deadline_left = the_thread->CPU_budget.available;
Priority_Control budget_left = priority - _Watchdog_Ticks_since_boot;
if ( deadline * budget_left > budget * deadline_left ) {
Thread_queue_Context queue_context;
/* Put late unblocked task to background until the end of period. */
_Thread_queue_Context_clear_priority_updates( &queue_context );
_Scheduler_CBS_Cancel_job(
scheduler,
the_thread,
the_node->deadline_node,
&queue_context
);
}
}
_Scheduler_EDF_Unblock( scheduler, the_thread, &the_node->Base.Base );
}
|