source: rtems/c/src/exec/score/src/coremutex.c @ 6f1118a

Last change on this file since 6f1118a was 6f1118a, checked in by Joel Sherrill <joel.sherrill@…>, on Aug 30, 2001 at 6:32:12 PM

2001-08-30 Joel Sherrill <joel@…>

  • src/coremutex.c, src/coremutexseize.c, src/coremutexsurrender.c: The per thread field resource_count should only be manipulated when a mutex is priority ceiling or priority inherit. This was reported by Chris Johns <ccj@…> who also noticed that the use of switches for all disciplines generated less efficient code than using explicit tests for the one or two cases we were really interested in. Further review of his modifications made it apparent that the "isa" methods to test mutex discipline were not being used so this modification was swept into the code as well.
  • Property mode set to 100644
File size: 2.6 KB
Line 
1/*
2 *  Mutex Handler
3 *
4 *  DESCRIPTION:
5 *
6 *  This package is the implementation of the Mutex Handler.
7 *  This handler provides synchronization and mutual exclusion capabilities.
8 *
9 *  COPYRIGHT (c) 1989-1999.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.OARcorp.com/rtems/license.html.
15 *
16 *  $Id$
17 */
18
19#include <rtems/system.h>
20#include <rtems/score/isr.h>
21#include <rtems/score/coremutex.h>
22#include <rtems/score/states.h>
23#include <rtems/score/thread.h>
24#include <rtems/score/threadq.h>
25
26/*PAGE
27 *
28 *  _CORE_mutex_Initialize
29 *
30 *  This routine initializes a mutex at create time and set the control
31 *  structure according to the values passed.
32 *
33 *  Input parameters:
34 *    the_mutex             - the mutex control block to initialize
35 *    the_class             - the API class of the object
36 *    the_mutex_attributes  - the mutex attributes specified at create time
37 *    initial_lock          - mutex initial lock or unlocked status
38 *    proxy_extract_callout - MP specific extract callout
39 *
40 *  Output parameters:  NONE
41 */
42
43void _CORE_mutex_Initialize(
44  CORE_mutex_Control           *the_mutex,
45  Objects_Classes               the_class,
46  CORE_mutex_Attributes        *the_mutex_attributes,
47  unsigned32                    initial_lock,
48  Thread_queue_Extract_callout  proxy_extract_callout
49)
50{
51
52/* Add this to the RTEMS environment later ?????????
53  rtems_assert( initial_lock == CORE_MUTEX_LOCKED ||
54                initial_lock == CORE_MUTEX_UNLOCKED );
55 */
56
57  the_mutex->Attributes = *the_mutex_attributes;
58  the_mutex->lock       = initial_lock;
59
60#if 0
61  if ( !the_mutex_attributes->only_owner_release &&
62       the_mutex_attributes->nesting_allowed ) {
63    _Internal_error_Occurred(
64      INTERNAL_ERROR_CORE,
65      TRUE,
66      INTERNAL_ERROR_BAD_ATTRIBUTES
67    );
68  }
69#endif
70
71  if ( initial_lock == CORE_MUTEX_LOCKED ) {
72    the_mutex->nest_count = 1;
73    the_mutex->holder     = _Thread_Executing;
74    the_mutex->holder_id  = _Thread_Executing->Object.id;
75    if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
76         _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) )
77      _Thread_Executing->resource_count++;
78  } else {
79    the_mutex->nest_count = 0;
80    the_mutex->holder     = NULL;
81    the_mutex->holder_id  = 0;
82  }
83
84  _Thread_queue_Initialize(
85    &the_mutex->Wait_queue,
86    the_class,
87    _CORE_mutex_Is_fifo( the_mutex_attributes ) ?
88      THREAD_QUEUE_DISCIPLINE_FIFO : THREAD_QUEUE_DISCIPLINE_PRIORITY,
89    STATES_WAITING_FOR_MUTEX,
90    proxy_extract_callout,
91    CORE_MUTEX_TIMEOUT
92  );
93}
94
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