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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | /* |
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| 22 | * Copyright (C) 2000 Massimiliano Giorgi |
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| 23 | * |
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| 24 | * This program is free software; you can redistribute it and/or modify |
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| 25 | * it under the terms of the GNU General Public License as published by |
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| 26 | * the Free Software Foundation; either version 2 of the License, or |
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| 27 | * (at your option) any later version. |
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| 28 | * |
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| 29 | * This program is distributed in the hope that it will be useful, |
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| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 32 | * GNU General Public License for more details. |
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| 33 | * |
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| 34 | * You should have received a copy of the GNU General Public License |
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| 35 | * along with this program; if not, write to the Free Software |
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| 36 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 37 | * |
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| 38 | */ |
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| 39 | |||
| 40 | #include "bqueue.h" |
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| 41 | #include "glue.h" |
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| 42 | |||
| 43 | /* |
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| 44 | * |
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| 45 | */ |
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| 46 | |||
| 47 | #include <modules/bd_edf.h> |
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| 48 | |||
| 49 | static __inline__ void get_dl(request_prologue_t *e) |
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| 50 | { |
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| 51 | e->x.dl=bd_edf_getdl(); |
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| 52 | } |
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| 53 | |||
| 54 | /* |
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| 55 | * |
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| 56 | */ |
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| 57 | |||
| 58 | int bd_edf_init(bd_edf_queue_t *q) |
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| 59 | { |
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| 60 | __b_fastmutex_init(&q->mutex); |
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| 61 | q->disk=NULL; |
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| 62 | q->queue=NULL; |
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| 63 | q->counter=0; |
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| 64 | q->inservice=0; |
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| 65 | return 0; |
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| 66 | } |
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| 67 | |||
| 68 | int bd_edf_numelements(bd_edf_queue_t *q) |
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| 69 | { |
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| 70 | return q->counter; |
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| 71 | } |
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| 72 | |||
| 73 | int bd_edf_insertrequest(bd_edf_queue_t *q, request_prologue_t *e) |
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| 74 | { |
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| 75 | request_prologue_t *p,*o; |
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| 76 | |||
| 77 | __b_fastmutex_lock(&q->mutex); |
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| 78 | |||
| 79 | get_dl(e); |
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| 80 | |||
| 81 | if (q->queue==NULL) { |
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| 82 | q->queue=e; |
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| 83 | e->x.next=NULL; |
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| 84 | } else { |
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| 85 | o=NULL; |
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| 86 | p=q->queue; |
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| 87 | if (q->inservice) { |
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| 88 | /* no preemption possible! */ |
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| 89 | o=p; |
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| 90 | p=p->x.next; |
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| 91 | } |
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| 92 | while (p!=NULL) { |
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| 93 | if (e->x.dl<p->x.dl) break; |
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| 94 | o=p; |
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| 95 | p=p->x.next; |
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| 96 | } |
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| 97 | o->x.next=e; |
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| 98 | e->x.next=p; |
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| 99 | } |
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| 100 | |||
| 101 | q->counter++; |
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| 102 | __b_fastmutex_unlock(&q->mutex); |
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| 103 | |||
| 104 | return 0; |
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| 105 | } |
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| 106 | |||
| 107 | request_prologue_t *bd_edf_getrequest(bd_edf_queue_t *q) |
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| 108 | { |
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| 109 | request_prologue_t *ret; |
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| 110 | |||
| 111 | __b_fastmutex_lock(&q->mutex); |
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| 112 | ret=q->queue; |
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| 113 | if (ret!=NULL) q->inservice=1; |
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| 114 | __b_fastmutex_lock(&q->mutex); |
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| 115 | |||
| 116 | return ret; |
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| 117 | } |
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| 118 | |||
| 119 | int bd_edf_removerequest(bd_edf_queue_t *q) |
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| 120 | { |
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| 121 | __b_fastmutex_lock(&q->mutex); |
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| 122 | assertk(q->queue!=NULL); |
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| 123 | q->queue=q->queue->x.next; |
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| 124 | q->inservice=0; |
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| 125 | q->counter--; |
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| 126 | __b_fastmutex_unlock(&q->mutex); |
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| 127 | |||
| 128 | return 0; |
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| 129 | } |
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| 130 | |||
| 131 | |||
| 132 |