1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Thread Wait Timeout |
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5 | * |
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6 | * @ingroup ScoreThread |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2008. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems/score/threadimpl.h> |
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23 | |
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24 | static void _Thread_Do_timeout( Thread_Control *the_thread ) |
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25 | { |
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26 | the_thread->Wait.return_code = the_thread->Wait.timeout_code; |
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27 | ( *the_thread->Wait.operations->extract )( |
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28 | the_thread->Wait.queue, |
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29 | the_thread |
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30 | ); |
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31 | _Thread_Wait_set_queue( the_thread, NULL ); |
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32 | _Thread_Wait_restore_default_operations( the_thread ); |
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33 | _Thread_Lock_restore_default( the_thread ); |
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34 | } |
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35 | |
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36 | void _Thread_Timeout( Objects_Id id, void *arg ) |
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37 | { |
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38 | Thread_Control *the_thread; |
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39 | void *thread_lock; |
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40 | ISR_lock_Context lock_context; |
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41 | Thread_Wait_flags wait_flags; |
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42 | bool unblock; |
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43 | |
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44 | the_thread = arg; |
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45 | thread_lock = _Thread_Lock_acquire( the_thread, &lock_context ); |
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46 | |
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47 | wait_flags = _Thread_Wait_flags_get( the_thread ); |
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48 | |
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49 | if ( ( wait_flags & THREAD_WAIT_STATE_READY_AGAIN ) == 0 ) { |
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50 | Thread_Wait_flags wait_class; |
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51 | Thread_Wait_flags ready_again; |
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52 | bool success; |
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53 | |
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54 | _Thread_Do_timeout( the_thread ); |
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55 | |
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56 | /* |
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57 | * This fence is only necessary for the events, see _Event_Seize(). The |
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58 | * thread queues use the thread lock for synchronization. |
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59 | */ |
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60 | _Atomic_Fence( ATOMIC_ORDER_RELEASE ); |
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61 | |
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62 | wait_class = wait_flags & THREAD_WAIT_CLASS_MASK; |
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63 | ready_again = wait_class | THREAD_WAIT_STATE_READY_AGAIN; |
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64 | success = _Thread_Wait_flags_try_change_critical( |
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65 | the_thread, |
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66 | wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK, |
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67 | ready_again |
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68 | ); |
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69 | |
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70 | if ( success ) { |
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71 | unblock = false; |
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72 | } else { |
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73 | _Assert( |
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74 | _Thread_Wait_flags_get( the_thread ) |
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75 | == wait_class | THREAD_WAIT_STATE_BLOCKED |
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76 | ); |
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77 | _Thread_Wait_flags_set( the_thread, ready_again ); |
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78 | unblock = true; |
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79 | } |
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80 | } else { |
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81 | unblock = false; |
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82 | } |
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83 | |
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84 | _Thread_Lock_release( thread_lock, &lock_context ); |
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85 | |
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86 | if ( unblock ) { |
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87 | _Thread_Unblock( the_thread ); |
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88 | |
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89 | #if defined(RTEMS_MULTIPROCESSING) |
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90 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
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91 | _Thread_MP_Free_proxy( the_thread ); |
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92 | } |
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93 | #endif |
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94 | } |
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95 | } |
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