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/attrimpl.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 | CORE_mutex_Status mutex_status; |
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31 | CORE_semaphore_Status semaphore_status; |
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32 | rtems_attribute attribute_set; |
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33 | ISR_lock_Context lock_context; |
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34 | |
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35 | the_semaphore = _Semaphore_Get( id, &lock_context ); |
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36 | |
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37 | if ( the_semaphore == NULL ) { |
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38 | #if defined(RTEMS_MULTIPROCESSING) |
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39 | return _Semaphore_MP_Release( id ); |
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40 | #else |
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41 | return RTEMS_INVALID_ID; |
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42 | #endif |
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43 | } |
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44 | |
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45 | attribute_set = the_semaphore->attribute_set; |
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46 | #if defined(RTEMS_SMP) |
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47 | if ( _Attributes_Is_multiprocessor_resource_sharing( attribute_set ) ) { |
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48 | MRSP_Status mrsp_status; |
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49 | |
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50 | mrsp_status = _MRSP_Surrender( |
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51 | &the_semaphore->Core_control.mrsp, |
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52 | _Thread_Executing, |
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53 | &lock_context |
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54 | ); |
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55 | return _Semaphore_Translate_MRSP_status_code( mrsp_status ); |
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56 | } else |
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57 | #endif |
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58 | if ( !_Attributes_Is_counting_semaphore( attribute_set ) ) { |
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59 | mutex_status = _CORE_mutex_Surrender( |
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60 | &the_semaphore->Core_control.mutex, |
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61 | _Semaphore_Core_mutex_mp_support, |
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62 | &lock_context |
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63 | ); |
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64 | return _Semaphore_Translate_core_mutex_return_code( mutex_status ); |
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65 | } else { |
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66 | semaphore_status = _CORE_semaphore_Surrender( |
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67 | &the_semaphore->Core_control.semaphore, |
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68 | _Semaphore_Core_mutex_mp_support, |
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69 | &lock_context |
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70 | ); |
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71 | return _Semaphore_Translate_core_semaphore_return_code( semaphore_status ); |
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72 | } |
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73 | } |
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