1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Event Manager Initialization |
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5 | * @ingroup ClassicEvent Events |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2008. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/sysinit.h> |
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22 | #include <rtems/rtems/eventimpl.h> |
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23 | #include <rtems/rtems/optionsimpl.h> |
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24 | #include <rtems/rtems/statusimpl.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/watchdogimpl.h> |
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27 | |
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28 | rtems_status_code _Event_Seize( |
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29 | rtems_event_set event_in, |
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30 | rtems_option option_set, |
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31 | rtems_interval ticks, |
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32 | rtems_event_set *event_out, |
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33 | Thread_Control *executing, |
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34 | Event_Control *event, |
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35 | Thread_Wait_flags wait_class, |
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36 | States_Control block_state, |
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37 | ISR_lock_Context *lock_context |
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38 | ) |
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39 | { |
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40 | rtems_event_set seized_events; |
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41 | rtems_event_set pending_events; |
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42 | bool success; |
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43 | Thread_Wait_flags intend_to_block; |
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44 | Per_CPU_Control *cpu_self; |
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45 | |
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46 | pending_events = event->pending_events; |
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47 | seized_events = _Event_sets_Get( pending_events, event_in ); |
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48 | |
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49 | if ( !_Event_sets_Is_empty( seized_events ) && |
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50 | (seized_events == event_in || _Options_Is_any( option_set )) ) { |
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51 | event->pending_events = |
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52 | _Event_sets_Clear( pending_events, seized_events ); |
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53 | _Thread_Lock_release_default( executing, lock_context ); |
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54 | *event_out = seized_events; |
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55 | return RTEMS_SUCCESSFUL; |
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56 | } |
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57 | |
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58 | if ( _Options_Is_no_wait( option_set ) ) { |
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59 | _Thread_Lock_release_default( executing, lock_context ); |
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60 | *event_out = seized_events; |
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61 | return RTEMS_UNSATISFIED; |
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62 | } |
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63 | |
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64 | intend_to_block = wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK; |
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65 | |
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66 | /* |
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67 | * Note what we are waiting for BEFORE we enter the critical section. |
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68 | * The interrupt critical section management code needs this to be |
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69 | * set properly when we are marked as in the event critical section. |
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70 | * |
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71 | * NOTE: Since interrupts are disabled, this isn't that much of an |
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72 | * issue but better safe than sorry. |
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73 | */ |
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74 | executing->Wait.return_code = STATUS_SUCCESSFUL; |
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75 | executing->Wait.option = option_set; |
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76 | executing->Wait.count = event_in; |
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77 | executing->Wait.return_argument = event_out; |
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78 | _Thread_Wait_flags_set( executing, intend_to_block ); |
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79 | |
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80 | cpu_self = _Thread_Dispatch_disable_critical( lock_context ); |
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81 | _Thread_Lock_release_default( executing, lock_context ); |
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82 | |
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83 | if ( ticks ) { |
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84 | _Thread_Timer_insert_relative( |
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85 | executing, |
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86 | cpu_self, |
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87 | _Thread_Timeout, |
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88 | ticks |
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89 | ); |
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90 | } |
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91 | |
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92 | _Thread_Set_state( executing, block_state ); |
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93 | |
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94 | /* |
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95 | * See _Event_Surrender() and _Thread_Timeout(), corresponding atomic |
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96 | * variable is Thread_Control::Wait::flags. |
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97 | */ |
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98 | _Atomic_Fence( ATOMIC_ORDER_ACQUIRE ); |
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99 | |
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100 | success = _Thread_Wait_flags_try_change( |
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101 | executing, |
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102 | intend_to_block, |
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103 | wait_class | THREAD_WAIT_STATE_BLOCKED |
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104 | ); |
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105 | if ( !success ) { |
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106 | _Thread_Timer_remove( executing ); |
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107 | _Thread_Unblock( executing ); |
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108 | } |
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109 | |
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110 | _Thread_Dispatch_enable( cpu_self ); |
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111 | return _Status_Get_after_wait( executing ); |
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112 | } |
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113 | |
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114 | #if defined(RTEMS_MULTIPROCESSING) |
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115 | static void _Event_Manager_initialization( void ) |
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116 | { |
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117 | _MPCI_Register_packet_processor( MP_PACKET_EVENT, _Event_MP_Process_packet ); |
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118 | } |
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119 | |
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120 | RTEMS_SYSINIT_ITEM( |
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121 | _Event_Manager_initialization, |
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122 | RTEMS_SYSINIT_CLASSIC_EVENT, |
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123 | RTEMS_SYSINIT_ORDER_MIDDLE |
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124 | ); |
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125 | #endif |
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