source: rtems/cpukit/score/src/coresemsurrender.c @ a6eef8b

Last change on this file since a6eef8b was a6eef8b, checked in by Joel Sherrill <joel.sherrill@…>, on 09/04/03 at 18:52:48

2003-09-04 Joel Sherrill <joel@…>

  • apiext.c, chain.c, coremsg.c, coremsgbroadcast.c, coremsgclose.c, coremsgflush.c, coremsgflushsupp.c, coremsgflushwait.c, coremsginsert.c, coremsgseize.c, coremsgsubmit.c, coremutex.c, coremutexflush.c, coremutexseize.c, coremutexsurrender.c, coresem.c, coresemflush.c, coresemseize.c, coresemsurrender.c, coretod.c, coretodset.c, coretodtickle.c, coretodtoseconds.c, coretodvalidate.c, heap.c, heapallocate.c, heapextend.c, heapfree.c, heapgetinfo.c, heapsizeofuserarea.c, heapwalk.c, interr.c, isr.c, mpci.c, object.c, objectallocate.c, objectallocatebyindex.c, objectclearname.c, objectcomparenameraw.c, objectcomparenamestring.c, objectcopynameraw.c, objectcopynamestring.c, objectextendinformation.c, objectfree.c, objectget.c, objectgetbyindex.c, objectgetisr.c, objectgetnext.c, objectgetnoprotection.c, objectinitializeinformation.c, objectmp.c, objectnametoid.c, objectshrinkinformation.c, thread.c, threadchangepriority.c, threadclearstate.c, threadclose.c, threadcreateidle.c, threaddelayended.c, threaddispatch.c, threadevaluatemode.c, threadget.c, threadhandler.c, threadidlebody.c, threadinitialize.c, threadloadenv.c, threadmp.c, threadq.c, threadqdequeue.c, threadqdequeuefifo.c, threadqdequeuepriority.c, threadqenqueue.c, threadqenqueuefifo.c, threadqenqueuepriority.c, threadqextract.c, threadqextractfifo.c, threadqextractpriority.c, threadqextractwithproxy.c, threadqfirst.c, threadqfirstfifo.c, threadqfirstpriority.c, threadqflush.c, threadqtimeout.c, threadready.c, threadreset.c, threadresettimeslice.c, threadrestart.c, threadresume.c, threadrotatequeue.c, threadsetpriority.c, threadsetstate.c, threadsettransient.c, threadstackallocate.c, threadstackfree.c, threadstart.c, threadstartmultitasking.c, threadsuspend.c, threadtickletimeslice.c, threadyieldprocessor.c, userext.c, watchdog.c, watchdogadjust.c, watchdoginsert.c, watchdogremove.c, watchdogtickle.c, wkspace.c: URL for license changed.
  • Property mode set to 100644
File size: 2.0 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.rtems.com/license/LICENSE.
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_Surrender
33 *
34 *  Input parameters:
35 *    the_semaphore            - the semaphore to be flushed
36 *    id                       - id of parent semaphore
37 *    api_semaphore_mp_support - api dependent MP support actions
38 *
39 *  Output parameters:
40 *    CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful
41 *    core error code                  - if unsuccessful
42 *
43 *  Output parameters:
44 */
45
46CORE_semaphore_Status _CORE_semaphore_Surrender(
47  CORE_semaphore_Control                *the_semaphore,
48  Objects_Id                             id,
49  CORE_semaphore_API_mp_support_callout  api_semaphore_mp_support
50)
51{
52  Thread_Control *the_thread;
53  ISR_Level       level;
54  CORE_semaphore_Status status;
55
56  status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
57
58  if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) {
59
60    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
61      (*api_semaphore_mp_support) ( the_thread, id );
62
63  } else {
64    _ISR_Disable( level );
65      if ( the_semaphore->count < the_semaphore->Attributes.maximum_count )
66        the_semaphore->count += 1;
67      else
68        status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
69    _ISR_Enable( level );
70  }
71
72  return status;
73}
74
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