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demo/router/msgqueue.h

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+/**
+* @file
+* @author Andriy Sukhynyuk, Vasyl Tkhir, Andriy Ivasiv
+* @date 2012
+* @brief Message queue module
+*
+* @section LICENSE
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*/
+#ifndef MSGQUEUE_H
+#define MSGQUEUE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include "bacdef.h"
+#include "npdu.h"
+
+extern pthread_mutex_t msg_lock;
+
+#define INVALID_MSGBOX_ID -1
+
+typedef int MSGBOX_ID;
+
+typedef enum {
+    DATA = 1,
+    SERVICE
+} MSGTYPE;
+
+typedef enum {
+    SHUTDOWN,
+    CHG_IP,
+    CHG_MAC
+} MSGSUBTYPE;
+
+typedef struct _message {
+    MSGTYPE type;
+    MSGBOX_ID origin;
+    MSGSUBTYPE subtype;
+    void *data;
+    /* add timestamp */
+} BACMSG;
+
+/* specific message type data structures */
+typedef struct _msg_data {
+    BACNET_ADDRESS dest;
+    BACNET_ADDRESS src;
+    uint8_t *pdu;
+    uint16_t pdu_len;
+    uint8_t ref_count;
+} MSG_DATA;
+
+MSGBOX_ID create_msgbox(
+    );
+
+/* returns sent byte count */
+bool send_to_msgbox(
+    MSGBOX_ID dest,
+    BACMSG * msg);
+
+/* returns received message */
+BACMSG *recv_from_msgbox(
+    MSGBOX_ID src,
+    BACMSG * msg);
+
+void del_msgbox(
+    MSGBOX_ID msgboxid);
+
+/* free message data structure */
+void free_data(
+    MSG_DATA * data);
+
+/* check message reference counter and delete data if needed */
+void check_data(
+    MSG_DATA * data);
+
+#endif /* end of MSGQUEUE_H */