source: rtems/cpukit/score/src/coremutex.c @ 1d486eff

4.104.114.84.95
Last change on this file since 1d486eff was 3127180, checked in by Ralf Corsepius <ralf.corsepius@…>, on 03/29/04 at 12:51:43

2004-04-29 Ralf Corsepius <ralf_corsepius@…>

  • score/src/Unlimited.txt, score/src/chain.c, score/src/coremsg.c, score/src/coremsgbroadcast.c, score/src/coremsgclose.c, score/src/coremsgflush.c, score/src/coremsgflushsupp.c, score/src/coremsgseize.c, score/src/coremsgsubmit.c, score/src/coremutex.c, score/src/coremutexflush.c, score/src/coresem.c, score/src/coresemflush.c, score/src/coretod.c, score/src/coretodtickle.c, score/src/coretodtoseconds.c, score/src/coretodvalidate.c, score/src/heap.c, score/src/heapallocate.c, score/src/heapextend.c, score/src/heapfree.c, score/src/heapsizeofuserarea.c, score/src/interr.c, score/src/iterateoverthreads.c, score/src/mpci.c, score/src/object.c, score/src/objectallocate.c, score/src/objectallocatebyindex.c, score/src/objectclearname.c, score/src/objectcomparenameraw.c, score/src/objectcomparenamestring.c, score/src/objectcopynameraw.c, score/src/objectcopynamestring.c, score/src/objectextendinformation.c, score/src/objectfree.c, score/src/objectget.c, score/src/objectgetbyindex.c, score/src/objectgetisr.c, score/src/objectgetnoprotection.c, score/src/objectidtoname.c, score/src/objectinitializeinformation.c, score/src/objectmp.c, score/src/objectnametoid.c, score/src/objectshrinkinformation.c, score/src/thread.c, score/src/threadcreateidle.c, score/src/threadget.c, score/src/threadidlebody.c, score/src/threadinitialize.c, score/src/threadmp.c, score/src/threadq.c, score/src/threadqdequeuepriority.c, score/src/threadqenqueuepriority.c, score/src/threadqfirstpriority.c, score/src/threadqflush.c, score/src/threadreset.c, score/src/threadrestart.c, score/src/threadsettransient.c, score/src/threadstackallocate.c, score/src/threadstart.c, score/src/userext.c, score/src/watchdoginsert.c, score/src/wkspace.c: Convert to using c99 fixed size types.
  • Property mode set to 100644
File size: 2.4 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.rtems.com/license/LICENSE.
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_mutex_attributes  - the mutex attributes specified at create time
36 *    initial_lock          - mutex initial lock or unlocked status
37 *
38 *  Output parameters:  NONE
39 */
40
41void _CORE_mutex_Initialize(
42  CORE_mutex_Control           *the_mutex,
43  CORE_mutex_Attributes        *the_mutex_attributes,
44  uint32_t                      initial_lock
45)
46{
47
48/* Add this to the RTEMS environment later ?????????
49  rtems_assert( initial_lock == CORE_MUTEX_LOCKED ||
50                initial_lock == CORE_MUTEX_UNLOCKED );
51 */
52
53  the_mutex->Attributes    = *the_mutex_attributes;
54  the_mutex->lock          = initial_lock;
55  the_mutex->blocked_count = 0;
56
57#if 0
58  if ( !the_mutex_attributes->only_owner_release &&
59       the_mutex_attributes->nesting_allowed ) {
60    _Internal_error_Occurred(
61      INTERNAL_ERROR_CORE,
62      TRUE,
63      INTERNAL_ERROR_BAD_ATTRIBUTES
64    );
65  }
66#endif
67
68  if ( initial_lock == CORE_MUTEX_LOCKED ) {
69    the_mutex->nest_count = 1;
70    the_mutex->holder     = _Thread_Executing;
71    the_mutex->holder_id  = _Thread_Executing->Object.id;
72    if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
73         _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) )
74      _Thread_Executing->resource_count++;
75  } else {
76    the_mutex->nest_count = 0;
77    the_mutex->holder     = NULL;
78    the_mutex->holder_id  = 0;
79  }
80
81  _Thread_queue_Initialize(
82    &the_mutex->Wait_queue,
83    _CORE_mutex_Is_fifo( the_mutex_attributes ) ?
84      THREAD_QUEUE_DISCIPLINE_FIFO : THREAD_QUEUE_DISCIPLINE_PRIORITY,
85    STATES_WAITING_FOR_MUTEX,
86    CORE_MUTEX_TIMEOUT
87  );
88}
89
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