patch-2.1.88 linux/drivers/acorn/scsi/msgqueue.h

• Lines: 72
• Date: Sat Oct 4 09:14:47 1997
• Orig file: v2.1.87/linux/drivers/acorn/scsi/msgqueue.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/scsi/msgqueue.h linux/drivers/acorn/scsi/msgqueue.h
@@ -0,0 +1,71 @@
+/*
+ * msgqueue.h: message queue handling
+ *
+ * (c) 1997 Russell King
+ */
+#ifndef MSGQUEUE_H
+#define MSGQUEUE_H
+
+struct msgqueue_entry {
+    char msg[8];
+    int length;
+    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: char *msgqueue_getnextmsg (MsgQueue_t *msgq, int *length)
+ * Purpose : return a message & its length
+ * Params  : msgq   - queue to obtain message from
+ *	     length - pointer to int for message length
+ * Returns : pointer to message string
+ */
+extern char *msgqueue_getnextmsg (MsgQueue_t *msgq, int *length);
+
+/*
+ * 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