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/rtems/eventimpl.h> |
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22 | #include <rtems/rtems/optionsimpl.h> |
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23 | #include <rtems/score/threadimpl.h> |
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24 | #include <rtems/score/watchdogimpl.h> |
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25 | |
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26 | /* |
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27 | * INTERRUPT LATENCY: |
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28 | * available |
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29 | * wait |
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30 | * check sync |
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31 | */ |
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32 | |
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33 | void _Event_Seize( |
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34 | rtems_event_set event_in, |
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35 | rtems_option option_set, |
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36 | rtems_interval ticks, |
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37 | rtems_event_set *event_out, |
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38 | Thread_Control *executing, |
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39 | Event_Control *event, |
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40 | Thread_Wait_flags wait_class, |
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41 | States_Control block_state, |
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42 | ISR_lock_Context *lock_context |
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43 | ) |
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44 | { |
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45 | rtems_event_set seized_events; |
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46 | rtems_event_set pending_events; |
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47 | bool success; |
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48 | Thread_Wait_flags intend_to_block; |
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49 | Per_CPU_Control *cpu_self; |
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50 | |
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51 | executing->Wait.return_code = RTEMS_SUCCESSFUL; |
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52 | |
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53 | pending_events = event->pending_events; |
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54 | seized_events = _Event_sets_Get( pending_events, event_in ); |
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55 | |
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56 | if ( !_Event_sets_Is_empty( seized_events ) && |
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57 | (seized_events == event_in || _Options_Is_any( option_set )) ) { |
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58 | event->pending_events = |
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59 | _Event_sets_Clear( pending_events, seized_events ); |
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60 | _Thread_Lock_release_default( executing, lock_context ); |
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61 | *event_out = seized_events; |
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62 | return; |
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63 | } |
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64 | |
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65 | if ( _Options_Is_no_wait( option_set ) ) { |
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66 | _Thread_Lock_release_default( executing, lock_context ); |
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67 | executing->Wait.return_code = RTEMS_UNSATISFIED; |
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68 | *event_out = seized_events; |
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69 | return; |
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70 | } |
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71 | |
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72 | intend_to_block = wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK; |
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73 | |
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74 | /* |
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75 | * Note what we are waiting for BEFORE we enter the critical section. |
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76 | * The interrupt critical section management code needs this to be |
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77 | * set properly when we are marked as in the event critical section. |
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78 | * |
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79 | * NOTE: Since interrupts are disabled, this isn't that much of an |
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80 | * issue but better safe than sorry. |
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81 | */ |
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82 | executing->Wait.option = option_set; |
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83 | executing->Wait.count = event_in; |
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84 | executing->Wait.return_argument = event_out; |
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85 | _Thread_Wait_flags_set( executing, intend_to_block ); |
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86 | |
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87 | cpu_self = _Thread_Dispatch_disable_critical( lock_context ); |
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88 | _Thread_Lock_release_default( executing, lock_context ); |
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89 | _Giant_Acquire( cpu_self ); |
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90 | |
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91 | if ( ticks ) { |
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92 | _Thread_Wait_set_timeout_code( executing, RTEMS_TIMEOUT ); |
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93 | _Watchdog_Initialize( |
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94 | &executing->Timer, |
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95 | _Thread_Timeout, |
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96 | 0, |
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97 | executing |
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98 | ); |
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99 | _Watchdog_Insert_ticks( &executing->Timer, ticks ); |
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100 | } |
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101 | |
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102 | _Thread_Set_state( executing, block_state ); |
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103 | |
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104 | success = _Thread_Wait_flags_try_change( |
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105 | executing, |
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106 | intend_to_block, |
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107 | wait_class | THREAD_WAIT_STATE_BLOCKED |
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108 | ); |
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109 | if ( !success ) { |
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110 | _Watchdog_Remove_ticks( &executing->Timer ); |
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111 | _Thread_Unblock( executing ); |
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112 | } |
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113 | |
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114 | _Giant_Release( cpu_self ); |
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115 | _Thread_Dispatch_enable( cpu_self ); |
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116 | } |
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