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79 lines
2.0 KiB
79 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/drivers/acorn/scsi/msgqueue.h |
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* |
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* Copyright (C) 1997 Russell King |
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* |
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* message queue handling |
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*/ |
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#ifndef MSGQUEUE_H |
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#define MSGQUEUE_H |
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struct message { |
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char msg[8]; |
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int length; |
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int fifo; |
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}; |
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struct msgqueue_entry { |
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struct message msg; |
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struct msgqueue_entry *next; |
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}; |
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#define NR_MESSAGES 4 |
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typedef struct { |
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struct msgqueue_entry *qe; |
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struct msgqueue_entry *free; |
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struct msgqueue_entry entries[NR_MESSAGES]; |
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} MsgQueue_t; |
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/* |
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* Function: void msgqueue_initialise(MsgQueue_t *msgq) |
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* Purpose : initialise a message queue |
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* Params : msgq - queue to initialise |
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*/ |
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extern void msgqueue_initialise(MsgQueue_t *msgq); |
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/* |
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* Function: void msgqueue_free(MsgQueue_t *msgq) |
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* Purpose : free a queue |
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* Params : msgq - queue to free |
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*/ |
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extern void msgqueue_free(MsgQueue_t *msgq); |
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/* |
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* Function: int msgqueue_msglength(MsgQueue_t *msgq) |
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* Purpose : calculate the total length of all messages on the message queue |
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* Params : msgq - queue to examine |
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* Returns : number of bytes of messages in queue |
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*/ |
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extern int msgqueue_msglength(MsgQueue_t *msgq); |
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/* |
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* Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno) |
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* Purpose : return a message & its length |
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* Params : msgq - queue to obtain message from |
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* : msgno - message number |
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* Returns : pointer to message string, or NULL |
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*/ |
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extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno); |
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/* |
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* Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...) |
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* Purpose : add a message onto a message queue |
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* Params : msgq - queue to add message on |
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* length - length of message |
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* ... - message bytes |
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* Returns : != 0 if successful |
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*/ |
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extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...); |
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/* |
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* Function: void msgqueue_flush(MsgQueue_t *msgq) |
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* Purpose : flush all messages from message queue |
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* Params : msgq - queue to flush |
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*/ |
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extern void msgqueue_flush(MsgQueue_t *msgq); |
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#endif
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