source: rtems/cpukit/score/src/threadsuspend.c @ eb02f47

4.104.114.84.95
Last change on this file since eb02f47 was eb02f47, checked in by Joel Sherrill <joel.sherrill@…>, on 11/10/99 at 13:48:27

Committed modifications from ITRON Task and Task Dependendent Synchronization
Working Group. Included are tests.

  • Property mode set to 100644
File size: 1.9 KB
Line 
1/*
2 *  Thread Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-1998.
6 *  On-Line Applications Research Corporation (OAR).
7 *  Copyright assigned to U.S. Government, 1994.
8 *
9 *  The license and distribution terms for this file may be
10 *  found in found in the file LICENSE in this distribution or at
11 *  http://www.OARcorp.com/rtems/license.html.
12 *
13 *  $Id$
14 */
15
16#include <rtems/system.h>
17#include <rtems/score/apiext.h>
18#include <rtems/score/context.h>
19#include <rtems/score/interr.h>
20#include <rtems/score/isr.h>
21#include <rtems/score/object.h>
22#include <rtems/score/priority.h>
23#include <rtems/score/states.h>
24#include <rtems/score/sysstate.h>
25#include <rtems/score/thread.h>
26#include <rtems/score/threadq.h>
27#include <rtems/score/userext.h>
28#include <rtems/score/wkspace.h>
29
30/*PAGE
31 *
32 * _Thread_Suspend
33 *
34 * This kernel routine sets the SUSPEND state in the THREAD.  The
35 * THREAD chain and suspend count are adjusted if necessary.
36 *
37 * Input parameters:
38 *   the_thread   - pointer to thread control block
39 *
40 * Output parameters:  NONE
41 *
42 *  INTERRUPT LATENCY:
43 *    ready chain
44 *    select map
45 */
46
47void _Thread_Suspend(
48  Thread_Control   *the_thread
49)
50{
51  ISR_Level      level;
52  Chain_Control *ready;
53
54  ready = the_thread->ready;
55  _ISR_Disable( level );
56  the_thread->suspend_count++;
57  if ( !_States_Is_ready( the_thread->current_state ) ) {
58    the_thread->current_state =
59       _States_Set( STATES_SUSPENDED, the_thread->current_state );
60    _ISR_Enable( level );
61    return;
62  }
63
64  the_thread->current_state = STATES_SUSPENDED;
65
66  if ( _Chain_Has_only_one_node( ready ) ) {
67
68    _Chain_Initialize_empty( ready );
69    _Priority_Remove_from_bit_map( &the_thread->Priority_map );
70
71  } else
72    _Chain_Extract_unprotected( &the_thread->Object.Node );
73
74  _ISR_Flash( level );
75
76  if ( _Thread_Is_heir( the_thread ) )
77     _Thread_Calculate_heir();
78
79  if ( _Thread_Is_executing( the_thread ) )
80    _Context_Switch_necessary = TRUE;
81
82  _ISR_Enable( level );
83}
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