1 | /* |
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2 | * CORE Semaphore Handler |
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3 | * |
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4 | * DESCRIPTION: |
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5 | * |
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6 | * This package is the implementation of the CORE Semaphore Handler. |
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7 | * This core object utilizes standard Dijkstra counting semaphores to provide |
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8 | * synchronization and mutual exclusion capabilities. |
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9 | * |
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10 | * COPYRIGHT (c) 1989-1999. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.com/license/LICENSE. |
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16 | * |
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17 | * $Id$ |
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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/system.h> |
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25 | #include <rtems/score/isr.h> |
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26 | #include <rtems/score/coresem.h> |
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27 | #include <rtems/score/states.h> |
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28 | #include <rtems/score/thread.h> |
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29 | #include <rtems/score/threadq.h> |
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30 | |
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31 | /*PAGE |
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32 | * |
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33 | * CORE_semaphore_Initialize |
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34 | * |
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35 | * This function initialize a semaphore and sets the initial value based |
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36 | * on the given count. |
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37 | * |
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38 | * Input parameters: |
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39 | * the_semaphore - the semaphore control block to initialize |
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40 | * the_semaphore_attributes - the attributes specified at create time |
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41 | * initial_value - semaphore's initial value |
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42 | * |
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43 | * Output parameters: NONE |
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44 | */ |
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45 | |
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46 | void _CORE_semaphore_Initialize( |
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47 | CORE_semaphore_Control *the_semaphore, |
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48 | CORE_semaphore_Attributes *the_semaphore_attributes, |
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49 | uint32_t initial_value |
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50 | ) |
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51 | { |
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52 | |
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53 | the_semaphore->Attributes = *the_semaphore_attributes; |
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54 | the_semaphore->count = initial_value; |
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55 | |
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56 | _Thread_queue_Initialize( |
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57 | &the_semaphore->Wait_queue, |
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58 | _CORE_semaphore_Is_priority( the_semaphore_attributes ) ? |
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59 | THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, |
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60 | STATES_WAITING_FOR_SEMAPHORE, |
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61 | CORE_SEMAPHORE_TIMEOUT |
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62 | ); |
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63 | } |
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