[3a4ae6c] | 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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[08311cc3] | 10 | * COPYRIGHT (c) 1989-1999. |
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[3a4ae6c] | 11 | * On-Line Applications Research Corporation (OAR). |
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| 12 | * |
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[98e4ebf5] | 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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[dd687d97] | 15 | * http://www.rtems.com/license/LICENSE. |
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[3a4ae6c] | 16 | */ |
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| 17 | |
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[a8eed23] | 18 | #if HAVE_CONFIG_H |
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| 19 | #include "config.h" |
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| 20 | #endif |
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| 21 | |
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[3a4ae6c] | 22 | #include <rtems/system.h> |
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[5e9b32b] | 23 | #include <rtems/score/isr.h> |
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| 24 | #include <rtems/score/coresem.h> |
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| 25 | #include <rtems/score/states.h> |
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| 26 | #include <rtems/score/thread.h> |
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| 27 | #include <rtems/score/threadq.h> |
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[3a4ae6c] | 28 | |
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[64adc13] | 29 | /* |
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[3a4ae6c] | 30 | * CORE_semaphore_Initialize |
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| 31 | * |
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| 32 | * This function initialize a semaphore and sets the initial value based |
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| 33 | * on the given count. |
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| 34 | * |
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| 35 | * Input parameters: |
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| 36 | * the_semaphore - the semaphore control block to initialize |
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| 37 | * the_semaphore_attributes - the attributes specified at create time |
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| 38 | * initial_value - semaphore's initial value |
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| 39 | * |
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| 40 | * Output parameters: NONE |
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| 41 | */ |
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| 42 | |
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| 43 | void _CORE_semaphore_Initialize( |
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| 44 | CORE_semaphore_Control *the_semaphore, |
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| 45 | CORE_semaphore_Attributes *the_semaphore_attributes, |
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[3127180] | 46 | uint32_t initial_value |
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[3a4ae6c] | 47 | ) |
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| 48 | { |
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| 49 | |
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| 50 | the_semaphore->Attributes = *the_semaphore_attributes; |
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| 51 | the_semaphore->count = initial_value; |
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| 52 | |
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| 53 | _Thread_queue_Initialize( |
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| 54 | &the_semaphore->Wait_queue, |
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| 55 | _CORE_semaphore_Is_priority( the_semaphore_attributes ) ? |
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| 56 | THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, |
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| 57 | STATES_WAITING_FOR_SEMAPHORE, |
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| 58 | CORE_SEMAPHORE_TIMEOUT |
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| 59 | ); |
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| 60 | } |
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