1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS Semaphore Release |
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5 | * @ingroup ClassicSem Semaphores |
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6 | * |
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7 | * This file contains the implementation of the Classic API directive |
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8 | * rtems_semaphore_release(). |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 1989-2014. |
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13 | * On-Line Applications Research Corporation (OAR). |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | #include "config.h" |
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22 | #endif |
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23 | |
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24 | #include <rtems/rtems/semimpl.h> |
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25 | #include <rtems/rtems/statusimpl.h> |
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26 | |
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27 | rtems_status_code rtems_semaphore_release( rtems_id id ) |
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28 | { |
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29 | Semaphore_Control *the_semaphore; |
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30 | Thread_queue_Context queue_context; |
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31 | Status_Control status; |
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32 | |
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33 | the_semaphore = _Semaphore_Get( id, &queue_context ); |
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34 | |
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35 | if ( the_semaphore == NULL ) { |
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36 | #if defined(RTEMS_MULTIPROCESSING) |
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37 | return _Semaphore_MP_Release( id ); |
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38 | #else |
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39 | return RTEMS_INVALID_ID; |
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40 | #endif |
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41 | } |
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42 | |
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43 | _Thread_queue_Context_set_MP_callout( |
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44 | &queue_context, |
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45 | _Semaphore_Core_mutex_mp_support |
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46 | ); |
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47 | |
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48 | switch ( the_semaphore->variant ) { |
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49 | #if defined(RTEMS_SMP) |
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50 | case SEMAPHORE_VARIANT_MRSP: |
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51 | status = _MRSP_Surrender( |
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52 | &the_semaphore->Core_control.mrsp, |
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53 | _Thread_Executing, |
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54 | &queue_context |
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55 | ); |
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56 | break; |
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57 | #endif |
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58 | case SEMAPHORE_VARIANT_MUTEX: |
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59 | status = _CORE_mutex_Surrender( |
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60 | &the_semaphore->Core_control.mutex, |
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61 | &queue_context |
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62 | ); |
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63 | break; |
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64 | default: |
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65 | _Assert( the_semaphore->variant == SEMAPHORE_VARIANT_COUNTING ); |
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66 | status = _CORE_semaphore_Surrender( |
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67 | &the_semaphore->Core_control.semaphore, |
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68 | _Semaphore_Get_operations( the_semaphore ), |
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69 | UINT32_MAX, |
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70 | &queue_context |
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71 | ); |
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72 | break; |
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73 | } |
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74 | |
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75 | return _Status_Get( status ); |
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76 | } |
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