1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Locking and Unlocking a Mutex |
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5 | * @ingroup POSIXAPI |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/posix/muteximpl.h> |
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22 | #include <rtems/posix/posixapi.h> |
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23 | |
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24 | /* |
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25 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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26 | * |
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27 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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28 | */ |
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29 | |
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30 | int pthread_mutex_unlock( |
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31 | pthread_mutex_t *mutex |
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32 | ) |
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33 | { |
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34 | POSIX_Mutex_Control *the_mutex; |
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35 | Thread_queue_Context queue_context; |
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36 | Thread_Control *executing; |
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37 | Status_Control status; |
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38 | |
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39 | the_mutex = _POSIX_Mutex_Get( mutex, &queue_context ); |
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40 | |
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41 | if ( the_mutex == NULL ) { |
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42 | return EINVAL; |
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43 | } |
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44 | |
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45 | executing = _Thread_Executing; |
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46 | |
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47 | switch ( the_mutex->protocol ) { |
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48 | case POSIX_MUTEX_PRIORITY_CEILING: |
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49 | status = _CORE_ceiling_mutex_Surrender( |
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50 | &the_mutex->Mutex, |
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51 | executing, |
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52 | &queue_context |
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53 | ); |
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54 | break; |
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55 | case POSIX_MUTEX_NO_PROTOCOL: |
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56 | status = _CORE_recursive_mutex_Surrender_no_protocol( |
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57 | &the_mutex->Mutex.Recursive, |
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58 | POSIX_MUTEX_NO_PROTOCOL_TQ_OPERATIONS, |
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59 | executing, |
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60 | &queue_context |
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61 | ); |
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62 | break; |
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63 | default: |
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64 | _Assert( the_mutex->protocol == POSIX_MUTEX_PRIORITY_INHERIT ); |
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65 | status = _CORE_mutex_Surrender( |
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66 | &the_mutex->Mutex.Recursive.Mutex, |
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67 | &queue_context |
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68 | ); |
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69 | break; |
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70 | } |
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71 | |
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72 | return _POSIX_Get_error( status ); |
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73 | } |
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