4.104.114.84.95
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[ac7d5ef0] | 1 | /* Shm_Envelope_control *Shm_Locked_queue_Get( lq_cb ) |
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| 2 | * |
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| 3 | * This routine returns an envelope control block from a shared |
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| 4 | * memory queue. |
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| 5 | * |
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| 6 | * Input parameters: |
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| 7 | * lq_cb - pointer to a locked queue control block |
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| 8 | * |
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| 9 | * Output parameters: |
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| 10 | * returns - pointer to an envelope control block |
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| 11 | * - NULL if no envelopes on specified queue |
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| 12 | * |
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[08311cc3] | 13 | * COPYRIGHT (c) 1989-1999. |
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[ac7d5ef0] | 14 | * On-Line Applications Research Corporation (OAR). |
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| 15 | * |
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[98e4ebf5] | 16 | * The license and distribution terms for this file may be |
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| 17 | * found in the file LICENSE in this distribution or at |
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[03f2154e] | 18 | * http://www.OARcorp.com/rtems/license.html. |
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[ac7d5ef0] | 19 | * |
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| 20 | * $Id$ |
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| 21 | */ |
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| 22 | |
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| 23 | #include <rtems.h> |
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[c64e4ed4] | 24 | #include <shm.h> |
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[ac7d5ef0] | 25 | |
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| 26 | Shm_Envelope_control *Shm_Locked_queue_Get( |
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| 27 | Shm_Locked_queue_Control *lq_cb |
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| 28 | ) |
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| 29 | { |
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| 30 | Shm_Envelope_control *tmp_ecb; |
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| 31 | rtems_unsigned32 tmpfront; |
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| 32 | |
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| 33 | tmp_ecb = NULL; |
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| 34 | Shm_Lock( lq_cb ); |
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[11290355] | 35 | |
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[ac7d5ef0] | 36 | tmpfront = Shm_Convert(lq_cb->front); |
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| 37 | if ( tmpfront != Shm_Locked_queue_End_of_list ) { |
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| 38 | tmp_ecb = &Shm_Envelopes[ tmpfront ]; |
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| 39 | lq_cb->front = tmp_ecb->next; |
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| 40 | if ( tmp_ecb->next == Shm_Locked_queue_End_of_list ) |
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| 41 | lq_cb->rear = Shm_Locked_queue_End_of_list; |
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| 42 | tmp_ecb->next = Shm_Locked_queue_Not_on_list; |
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| 43 | } |
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[11290355] | 44 | |
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[ac7d5ef0] | 45 | Shm_Unlock( lq_cb ); |
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| 46 | return( tmp_ecb ); |
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| 47 | } |
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