1 | /* |
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2 | * Cancel Thread Blocking Operation |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-2007. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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11 | */ |
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12 | |
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13 | #if HAVE_CONFIG_H |
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14 | #include "config.h" |
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15 | #endif |
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16 | |
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17 | #include <rtems/system.h> |
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18 | #include <rtems/score/thread.h> |
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19 | #if defined(RTEMS_DEBUG) |
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20 | #include <rtems/score/interr.h> |
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21 | #endif |
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22 | |
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23 | void _Thread_blocking_operation_Cancel( |
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24 | #if defined(RTEMS_DEBUG) |
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25 | Thread_blocking_operation_States sync_state, |
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26 | #else |
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27 | Thread_blocking_operation_States sync_state __attribute__((unused)), |
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28 | #endif |
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29 | Thread_Control *the_thread, |
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30 | ISR_Level level |
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31 | ) |
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32 | { |
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33 | /* |
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34 | * Cases that should not happen and why. |
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35 | * |
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36 | * THREAD_BLOCKING_OPERATION_SYNCHRONIZED: |
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37 | * |
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38 | * This indicates that someone did not enter a blocking |
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39 | * operation critical section. |
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40 | * |
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41 | * THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED: |
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42 | * |
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43 | * This indicates that there was nothing to cancel so |
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44 | * we should not have been called. |
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45 | */ |
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46 | |
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47 | #if defined(RTEMS_DEBUG) |
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48 | if ( (sync_state == THREAD_BLOCKING_OPERATION_SYNCHRONIZED) || |
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49 | (sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED) ) { |
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50 | _Internal_error_Occurred( |
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51 | INTERNAL_ERROR_CORE, |
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52 | true, |
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53 | INTERNAL_ERROR_IMPLEMENTATION_BLOCKING_OPERATION_CANCEL |
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54 | ); |
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55 | } |
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56 | #endif |
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57 | |
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58 | /* |
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59 | * The thread is not waiting on anything after this completes. |
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60 | */ |
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61 | the_thread->Wait.queue = NULL; |
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62 | |
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63 | /* |
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64 | * If the sync state is timed out, this is very likely not needed. |
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65 | * But better safe than sorry when it comes to critical sections. |
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66 | */ |
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67 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) { |
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68 | _Watchdog_Deactivate( &the_thread->Timer ); |
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69 | _ISR_Enable( level ); |
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70 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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71 | } else |
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72 | _ISR_Enable( level ); |
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73 | |
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74 | /* |
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75 | * Global objects with thread queue's should not be operated on from an |
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76 | * ISR. But the sync code still must allow short timeouts to be processed |
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77 | * correctly. |
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78 | */ |
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79 | |
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80 | _Thread_Unblock( the_thread ); |
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81 | |
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82 | #if defined(RTEMS_MULTIPROCESSING) |
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83 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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84 | _Thread_MP_Free_proxy( the_thread ); |
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85 | #endif |
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86 | |
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87 | } |
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