source: rtems/cpukit/score/src/coresem.c @ ef9505a

4.104.114.84.9
Last change on this file since ef9505a was ef9505a, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 1, 2002 at 10:30:12 PM

2002-07-01 Joel Sherrill <joel@…>

  • Mega patch merge to change the format of the object IDs to loosen the dependency between the SCORE and the various APIs. There was considerable work to simplify the object name management and it appears that the name_table field is no longer needed. This patch also includes the addition of the internal mutex which is currently only used to protect some types of allocation and deallocation. This significantly can reduce context switch latency under certain circumstances. In particular, some heap/region operations were O(n) and had dispatching disabled. This should help enormously. With this merge, the patch is not as clean as it should be. In particular, the documentation has not been modified to reflect the new object ID layout, the IDs in the test screens are not updated, and _Objects_Get_information needs to be a real routine not inlined. As part of this patch a lot of MP code for thread/proxy blocking was made conditional and cleaned up.
  • include/Makefile.am, include/rtems/score/coremsg.h, include/rtems/score/coremutex.h, include/rtems/score/coresem.h, include/rtems/score/object.h, include/rtems/score/threadq.h, inline/rtems/score/object.inl, inline/rtems/score/thread.inl, macros/rtems/score/object.inl, src/Makefile.am, src/coremsg.c, src/coremutex.c, src/coresem.c, src/mpci.c, src/objectcomparenameraw.c, src/objectextendinformation.c, src/objectinitializeinformation.c, src/objectnametoid.c, src/thread.c, src/threadclose.c, src/threadget.c, src/threadq.c, src/threadqextractwithproxy.c: Modified as part of above.
  • include/rtems/score/apimutex.h, src/objectgetnoprotection.c: New files.
  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 *  CORE Semaphore Handler
3 *
4 *  DESCRIPTION:
5 *
6 *  This package is the implementation of the CORE Semaphore Handler.
7 *  This core object utilizes standard Dijkstra counting semaphores to provide
8 *  synchronization and mutual exclusion capabilities.
9 *
10 *  COPYRIGHT (c) 1989-1999.
11 *  On-Line Applications Research Corporation (OAR).
12 *
13 *  The license and distribution terms for this file may be
14 *  found in the file LICENSE in this distribution or at
15 *  http://www.OARcorp.com/rtems/license.html.
16 *
17 *  $Id$
18 */
19
20#include <rtems/system.h>
21#include <rtems/score/isr.h>
22#include <rtems/score/coresem.h>
23#include <rtems/score/states.h>
24#include <rtems/score/thread.h>
25#include <rtems/score/threadq.h>
26#if defined(RTEMS_MULTIPROCESSING)
27#include <rtems/score/mpci.h>
28#endif
29
30/*PAGE
31 *
32 *  CORE_semaphore_Initialize
33 *
34 *  This function initialize a semaphore and sets the initial value based
35 *  on the given count.
36 *
37 *  Input parameters:
38 *    the_semaphore            - the semaphore control block to initialize
39 *    the_semaphore_attributes - the attributes specified at create time
40 *    initial_value            - semaphore's initial value
41 *
42 *  Output parameters:  NONE
43 */
44
45void _CORE_semaphore_Initialize(
46  CORE_semaphore_Control       *the_semaphore,
47  CORE_semaphore_Attributes    *the_semaphore_attributes,
48  unsigned32                    initial_value
49)
50{
51
52  the_semaphore->Attributes = *the_semaphore_attributes;
53  the_semaphore->count      = initial_value;
54
55  _Thread_queue_Initialize(
56    &the_semaphore->Wait_queue,
57    _CORE_semaphore_Is_priority( the_semaphore_attributes ) ?
58              THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,
59    STATES_WAITING_FOR_SEMAPHORE,
60    CORE_SEMAPHORE_TIMEOUT
61  );
62}
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