lib/libdriver/mq.c

   1 /*
   2 inet/mq.c
   3
   4 Created:        Jan 3, 1992 by Philip Homburg
   5
   6 Copyright 1995 Philip Homburg
   7 */
   8
   9 #include <ansi.h>
  10 #include <assert.h>
  11
  12 #include <minix/config.h>
  13 #include <minix/const.h>
  14 #include <minix/type.h>
  15 #include <minix/ipc.h>
  16 #include <minix/mq.h>
  17
  18 #define MQ_SIZE         128
  19
  20 PRIVATE mq_t mq_list[MQ_SIZE];
  21 PRIVATE mq_t *mq_freelist;
  22
  23 void mq_init()
  24 {
  25         int i;
  26
  27         mq_freelist= NULL;
  28         for (i= 0; i<MQ_SIZE; i++)
  29         {
  30                 mq_list[i].mq_next= mq_freelist;
  31                 mq_freelist= &mq_list[i];
  32                 mq_list[i].mq_allocated= 0;
  33         }
  34 }
  35
  36 mq_t *mq_get()
  37 {
  38         mq_t *mq;
  39
  40         mq= mq_freelist;
  41         assert(mq != NULL);
  42
  43         mq_freelist= mq->mq_next;
  44         mq->mq_next= NULL;
  45         assert(mq->mq_allocated == 0);
  46         mq->mq_allocated= 1;
  47         return mq;
  48 }
  49
  50 void mq_free(mq)
  51 mq_t *mq;
  52 {
  53         mq->mq_next= mq_freelist;
  54         mq_freelist= mq;
  55         assert(mq->mq_allocated == 1);
  56         mq->mq_allocated= 0;
  57 }
  58
  59 /*
  60  * $PchId: mq.c,v 1.7 1998/10/23 20:10:47 philip Exp $
  61  */