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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980/* SPDX-License-Identifier: GPL-2.0-only *//* * linux/drivers/acorn/scsi/msgqueue.h * * Copyright (C) 1997 Russell King * * 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