source: rtems/cpukit/rtems/src/eventseize.c @ ed24ed4e

5
Last change on this file since ed24ed4e was ed24ed4e, checked in by Sebastian Huber <sebastian.huber@…>, on 02/08/18 at 09:47:16

Use _Thread_Dispatch_direct()

Use _Thread_Dispatch_direct() for operations that block the executing
thread. This ensures that we get a fatal error
(INTERNAL_ERROR_BAD_THREAD_DISPATCH_DISABLE_LEVEL) if we try to block in
an invalid context, e.g. during system start or an interrupt handler.

  • Property mode set to 100644
File size: 3.2 KB
RevLine 
[4c90eb4]1/**
2 * @file
[cc2bc302]3 *
[4c90eb4]4 * @brief Event Manager Initialization
5 * @ingroup ClassicEvent Events
6 */
7
8/*
[3168deaa]9 *  COPYRIGHT (c) 1989-2008.
[cc2bc302]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
[c499856]14 *  http://www.rtems.org/license/LICENSE.
[cc2bc302]15 */
16
[1095ec1]17#if HAVE_CONFIG_H
[990575c]18  #include "config.h"
[1095ec1]19#endif
20
[ae85b066]21#include <rtems/sysinit.h>
[e151eb1]22#include <rtems/rtems/eventimpl.h>
[caab339]23#include <rtems/rtems/optionsimpl.h>
[dce48791]24#include <rtems/rtems/statusimpl.h>
[5618c37a]25#include <rtems/score/threadimpl.h>
[4b48ece0]26#include <rtems/score/watchdogimpl.h>
[cc2bc302]27
[dce48791]28rtems_status_code _Event_Seize(
[7d6e94b]29  rtems_event_set    event_in,
30  rtems_option       option_set,
31  rtems_interval     ticks,
32  rtems_event_set   *event_out,
33  Thread_Control    *executing,
34  Event_Control     *event,
35  Thread_Wait_flags  wait_class,
36  States_Control     block_state,
37  ISR_lock_Context  *lock_context
[cc2bc302]38)
39{
[7d6e94b]40  rtems_event_set    seized_events;
41  rtems_event_set    pending_events;
42  bool               success;
43  Thread_Wait_flags  intend_to_block;
44  Per_CPU_Control   *cpu_self;
[cc2bc302]45
[990575c]46  pending_events = event->pending_events;
[cc2bc302]47  seized_events  = _Event_sets_Get( pending_events, event_in );
48
49  if ( !_Event_sets_Is_empty( seized_events ) &&
50       (seized_events == event_in || _Options_Is_any( option_set )) ) {
[990575c]51    event->pending_events =
[cc2bc302]52      _Event_sets_Clear( pending_events, seized_events );
[1fcac5ad]53    _Thread_Wait_release_default( executing, lock_context );
[cc2bc302]54    *event_out = seized_events;
[dce48791]55    return RTEMS_SUCCESSFUL;
[cc2bc302]56  }
57
58  if ( _Options_Is_no_wait( option_set ) ) {
[1fcac5ad]59    _Thread_Wait_release_default( executing, lock_context );
[cc2bc302]60    *event_out = seized_events;
[dce48791]61    return RTEMS_UNSATISFIED;
[cc2bc302]62  }
63
[7d6e94b]64  intend_to_block = wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK;
65
[4b45c13]66  /*
67   *  Note what we are waiting for BEFORE we enter the critical section.
68   *  The interrupt critical section management code needs this to be
69   *  set properly when we are marked as in the event critical section.
70   *
71   *  NOTE: Since interrupts are disabled, this isn't that much of an
72   *        issue but better safe than sorry.
73   */
[dce48791]74  executing->Wait.return_code     = STATUS_SUCCESSFUL;
[7d6e94b]75  executing->Wait.option          = option_set;
76  executing->Wait.count           = event_in;
77  executing->Wait.return_argument = event_out;
78  _Thread_Wait_flags_set( executing, intend_to_block );
[4b45c13]79
[d5423295]80  cpu_self = _Thread_Dispatch_disable_critical( lock_context );
[1fcac5ad]81  _Thread_Wait_release_default( executing, lock_context );
[cc2bc302]82
83  if ( ticks ) {
[02878626]84    _Thread_Add_timeout_ticks( executing, cpu_self, ticks );
[cc2bc302]85  }
86
[7d6e94b]87  _Thread_Set_state( executing, block_state );
[cc2bc302]88
[02987728]89  success = _Thread_Wait_flags_try_change_acquire(
[7d6e94b]90    executing,
91    intend_to_block,
92    wait_class | THREAD_WAIT_STATE_BLOCKED
93  );
94  if ( !success ) {
[03b900d]95    _Thread_Timer_remove( executing );
[7d6e94b]96    _Thread_Unblock( executing );
[cc2bc302]97  }
[3168deaa]98
[ed24ed4e]99  _Thread_Dispatch_direct( cpu_self );
[dce48791]100  return _Status_Get_after_wait( executing );
[cc2bc302]101}
[ae85b066]102
103#if defined(RTEMS_MULTIPROCESSING)
104static void _Event_Manager_initialization( void )
105{
106  _MPCI_Register_packet_processor( MP_PACKET_EVENT, _Event_MP_Process_packet );
107}
108
109RTEMS_SYSINIT_ITEM(
110  _Event_Manager_initialization,
111  RTEMS_SYSINIT_CLASSIC_EVENT,
112  RTEMS_SYSINIT_ORDER_MIDDLE
113);
114#endif
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