minix/drivers/libdriver/mq.c

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/*
inet/mq.c
Created: Jan 3, 1992 by Philip Homburg
Copyright 1995 Philip Homburg
*/
#include <ansi.h>
#include <assert.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/mq.h>
#define MQ_SIZE 128
PRIVATE mq_t mq_list[MQ_SIZE];
PRIVATE mq_t *mq_freelist;
void mq_init()
{
int i;
mq_freelist= NULL;
for (i= 0; i<MQ_SIZE; i++)
{
mq_list[i].mq_next= mq_freelist;
mq_freelist= &mq_list[i];
mq_list[i].mq_allocated= 0;
}
}
mq_t *mq_get()
{
mq_t *mq;
mq= mq_freelist;
assert(mq != NULL);
mq_freelist= mq->mq_next;
mq->mq_next= NULL;
assert(mq->mq_allocated == 0);
mq->mq_allocated= 1;
return mq;
}
void mq_free(mq)
mq_t *mq;
{
mq->mq_next= mq_freelist;
mq_freelist= mq;
assert(mq->mq_allocated == 1);
mq->mq_allocated= 0;
}
/*
* $PchId: mq.c,v 1.7 1998/10/23 20:10:47 philip Exp $
*/