1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Rate Monotonic Timeout |
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5 | * @ingroup ClassicRateMon |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2009. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * COPYRIGHT (c) 2016 Kuan-Hsun Chen. |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <rtems/rtems/ratemonimpl.h> |
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24 | |
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25 | void _Rate_monotonic_Timeout( Watchdog_Control *the_watchdog ) |
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26 | { |
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27 | Rate_monotonic_Control *the_period; |
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28 | Thread_Control *owner; |
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29 | ISR_lock_Context lock_context; |
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30 | Thread_Wait_flags wait_flags; |
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31 | |
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32 | the_period = RTEMS_CONTAINER_OF( the_watchdog, Rate_monotonic_Control, Timer ); |
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33 | owner = the_period->owner; |
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34 | |
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35 | _ISR_lock_ISR_disable( &lock_context ); |
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36 | _Rate_monotonic_Acquire_critical( the_period, &lock_context ); |
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37 | wait_flags = _Thread_Wait_flags_get( owner ); |
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38 | |
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39 | if ( |
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40 | ( wait_flags & THREAD_WAIT_CLASS_PERIOD ) != 0 |
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41 | && owner->Wait.return_argument == the_period |
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42 | ) { |
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43 | bool unblock; |
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44 | bool success; |
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45 | |
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46 | owner->Wait.return_argument = NULL; |
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47 | |
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48 | success = _Thread_Wait_flags_try_change_release( |
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49 | owner, |
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50 | RATE_MONOTONIC_INTEND_TO_BLOCK, |
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51 | RATE_MONOTONIC_READY_AGAIN |
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52 | ); |
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53 | if ( success ) { |
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54 | unblock = false; |
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55 | } else { |
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56 | _Assert( _Thread_Wait_flags_get( owner ) == RATE_MONOTONIC_BLOCKED ); |
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57 | _Thread_Wait_flags_set( owner, RATE_MONOTONIC_READY_AGAIN ); |
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58 | unblock = true; |
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59 | } |
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60 | |
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61 | _Rate_monotonic_Restart( the_period, owner, &lock_context ); |
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62 | |
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63 | if ( unblock ) { |
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64 | _Thread_Unblock( owner ); |
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65 | } |
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66 | } else { |
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67 | /* |
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68 | * If the watchdog is timeout, it means there is an additional postponed |
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69 | * job in the next period but it is not available to release now: |
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70 | * Either the current task is still executed, or it is preemptive by the |
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71 | * other higher priority tasks. |
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72 | */ |
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73 | the_period->postponed_jobs += 1; |
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74 | the_period->state = RATE_MONOTONIC_EXPIRED; |
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75 | _Rate_monotonic_Renew_deadline( the_period, owner, &lock_context ); |
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76 | } |
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77 | } |
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