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1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Obtain a Read Lock on a RWLock Instance |
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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/rwlockimpl.h> |
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22 | #include <rtems/posix/posixapi.h> |
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23 | |
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24 | int pthread_rwlock_rdlock( |
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25 | pthread_rwlock_t *rwlock |
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26 | ) |
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27 | { |
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28 | POSIX_RWLock_Control *the_rwlock; |
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29 | Thread_queue_Context queue_context; |
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30 | Status_Control status; |
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31 | |
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32 | the_rwlock = _POSIX_RWLock_Get( rwlock ); |
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33 | POSIX_RWLOCK_VALIDATE_OBJECT( the_rwlock ); |
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34 | |
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35 | _Thread_queue_Context_initialize( &queue_context ); |
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36 | _Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context ); |
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37 | status = _CORE_RWLock_Seize_for_reading( |
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38 | &the_rwlock->RWLock, |
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39 | true, /* we are willing to wait forever */ |
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40 | &queue_context |
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41 | ); |
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42 | return _POSIX_Get_error( status ); |
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43 | } |
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