source: rtems/cpukit/score/src/coresemsurrender.c @ e6f7f81

4.115
Last change on this file since e6f7f81 was c4f58558, checked in by Sebastian Huber <sebastian.huber@…>, on 07/18/13 at 12:14:04

score: Create semaphore implementation header

Move implementation specific parts of coresem.h and coresem.inl into new
header file coresemimpl.h. The coresem.h contains now only the
application visible API.

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/**
2 * @file
3 *
4 * @brief Surrenders a Unit to a Semaphore
5 *
6 * @ingroup ScoreSemaphore
7 */
8
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
18#if HAVE_CONFIG_H
19#include "config.h"
20#endif
21
22#include <rtems/system.h>
23#include <rtems/score/isr.h>
24#include <rtems/score/coresemimpl.h>
25#include <rtems/score/states.h>
26#include <rtems/score/thread.h>
27#include <rtems/score/threadq.h>
28
29CORE_semaphore_Status _CORE_semaphore_Surrender(
30  CORE_semaphore_Control                *the_semaphore,
31  Objects_Id                             id,
32  CORE_semaphore_API_mp_support_callout  api_semaphore_mp_support
33)
34{
35  Thread_Control *the_thread;
36  ISR_Level       level;
37  CORE_semaphore_Status status;
38
39  status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
40
41  if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) {
42
43#if defined(RTEMS_MULTIPROCESSING)
44    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
45      (*api_semaphore_mp_support) ( the_thread, id );
46#endif
47
48  } else {
49    _ISR_Disable( level );
50      if ( the_semaphore->count < the_semaphore->Attributes.maximum_count )
51        the_semaphore->count += 1;
52      else
53        status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
54    _ISR_Enable( level );
55  }
56
57  return status;
58}
Note: See TracBrowser for help on using the repository browser.