+#include <sys/types.h>
+#include <yaz/comstack.h>
+#include <yaz/odr.h>
+#include <yaz/oid.h>
+#include <yaz/proto.h>
+#include "eventl.h"
+
+typedef enum {
+ REQUEST_IDLE, /* the request is just sitting in the queue */
+ REQUEST_PENDING /* operation pending (b'end processing or network I/O*/
+ /* this list will have more elements when acc/res control is added */
+} request_state;
+
+typedef struct request
+{
+ int len_refid; /* length of referenceid */
+ char *refid; /* referenceid */
+ request_state state;
+
+ Z_GDU *gdu_request; /* Current request */
+ Z_APDU *apdu_request; /* Current Z39.50 request */
+ NMEM request_mem; /* memory handle for request */
+
+ int size_response; /* size of buffer */
+ int len_response; /* length of encoded data */
+ char *response; /* encoded data waiting for transmission */
+
+ void *clientData;
+ struct request *next;
+ struct request_q *q;
+} request;
+
+typedef struct request_q
+{
+ request *head;
+ request *tail;
+ request *list;
+ int num;
+} request_q;
+
+/*
+ * association state.
+ */
+typedef enum
+{
+ ASSOC_NEW, /* not initialized yet */
+ ASSOC_UP, /* normal operation */
+ ASSOC_DEAD /* dead. Close if input arrives */
+} association_state;