2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 21:54:06 +08:00
linux-next/drivers/scsi/arm/msgqueue.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

83 lines
2.1 KiB
C

/*
* linux/drivers/acorn/scsi/msgqueue.h
*
* Copyright (C) 1997 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* message queue handling
*/
#ifndef MSGQUEUE_H
#define MSGQUEUE_H
struct message {
char msg[8];
int length;
int fifo;
};
struct msgqueue_entry {
struct message msg;
struct msgqueue_entry *next;
};
#define NR_MESSAGES 4
typedef struct {
struct msgqueue_entry *qe;
struct msgqueue_entry *free;
struct msgqueue_entry entries[NR_MESSAGES];
} MsgQueue_t;
/*
* Function: void msgqueue_initialise(MsgQueue_t *msgq)
* Purpose : initialise a message queue
* Params : msgq - queue to initialise
*/
extern void msgqueue_initialise(MsgQueue_t *msgq);
/*
* Function: void msgqueue_free(MsgQueue_t *msgq)
* Purpose : free a queue
* Params : msgq - queue to free
*/
extern void msgqueue_free(MsgQueue_t *msgq);
/*
* Function: int msgqueue_msglength(MsgQueue_t *msgq)
* Purpose : calculate the total length of all messages on the message queue
* Params : msgq - queue to examine
* Returns : number of bytes of messages in queue
*/
extern int msgqueue_msglength(MsgQueue_t *msgq);
/*
* Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
* Purpose : return a message & its length
* Params : msgq - queue to obtain message from
* : msgno - message number
* Returns : pointer to message string, or NULL
*/
extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno);
/*
* Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
* Purpose : add a message onto a message queue
* Params : msgq - queue to add message on
* length - length of message
* ... - message bytes
* Returns : != 0 if successful
*/
extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...);
/*
* Function: void msgqueue_flush(MsgQueue_t *msgq)
* Purpose : flush all messages from message queue
* Params : msgq - queue to flush
*/
extern void msgqueue_flush(MsgQueue_t *msgq);
#endif