Replaces old not yet sent messages with new one if one arrives

src/exe/rt_qmon/src/rt_qmon.c

 /* 
- * Proview   $Id: rt_qmon.c,v 1.8 2006-02-14 05:28:09 claes Exp $
+ * Proview   $Id: rt_qmon.c,v 1.9 2006-03-20 06:47:42 claes Exp $
  * Copyright (C) 2005 SSAB Oxelsund AB.
  *
  * This program is free software; you can redistribute it and/or 
@@ -135,6 +135,7 @@ struct sEseg {
   sLink	 		*lp;
   lst_sEntry		le_bcast;
   lst_sEntry		le_seg;
+  unsigned int          id;
   qdb_sBuffer		*bp;
   char			*p;
   int			bytes;
@@ -281,6 +282,7 @@ struct {
 static pwr_tStatus qcom_sts = PWR__SRVSTARTUP;
 
 static void		cancel_links();
+static pwr_tBoolean     clean_insert (lst_sEntry*, sEseg*, pwr_tBoolean);
 static sEseg*		create_connect (sLink*);
 static void		create_links();
 static void		decode_head(sHead*, sHead*);
@@ -441,6 +443,86 @@ cancel_links ()
   for (lp = tree_Minimum(&sts, l.links.table); lp != NULL; lp = tree_Successor(&sts, l.links.table, lp))
     thread_Cancel(&lp->thread);
 
+}
+
+/* Free unsent segments from que that has not been
+   sent which will be replaced by new segment  */
+
+static pwr_tBoolean
+clean_insert (
+  lst_sEntry *le,
+  sEseg *esp, 
+  pwr_tBoolean pending
+)
+{
+  lst_sEntry *se, *li;
+  sEseg *sp, *nsp;
+  pwr_tBoolean ret_pend = FALSE;
+  pwr_tBoolean first = FALSE;
+
+  li = le;
+  if (esp->bp != NULL) {
+    if (esp->bp->b.msg_id > 0) {
+    
+      if ((!pending) && (esp->head.flags.b.first)) {
+  
+        for (sp = lst_Succ(NULL, le, &se); se != le; sp = nsp) {
+	  li = se;
+          nsp = lst_Succ(NULL, se, &se);
+
+          if (sp->bp != NULL) {      
+            if (sp->bp->b.msg_id == esp->bp->b.msg_id) {
+              if (sp->head.flags.b.first)
+                first = TRUE;
+	      if (first) {
+	        lst_Remove(NULL, &sp->c.le);
+	        eseg_free(sp);
+		li = se;
+	      } else {
+	        break;
+	      }
+            } else if (first) {
+              break;
+	    }
+          } else if (first) {
+	    break;
+	  }
+        }
+	
+        if (!esp->head.flags.b.last && first) ret_pend = TRUE;
+	if (!first) li = le;
+      }
+      else if (pending) {
+
+        for (sp = lst_Succ(NULL, le, &se); se != le; sp = nsp) {
+          li = se;
+          nsp = lst_Succ(NULL, se, &se);
+
+          if (sp->bp != NULL) {      
+            if ((sp->bp->b.msg_id == esp->bp->b.msg_id) &&
+	        (sp->bp == esp->bp)) {
+              first = TRUE;
+	      li = se;
+            } else if (first) {
+              break;
+	    }
+          } else if (first) {
+	    break;
+	  }
+        }
+	
+	if (!first) li = le;
+	ret_pend = !esp->head.flags.b.last;
+      }
+    }
+  }
+  
+  /* Insert new item */
+  
+  lst_InsertPred(NULL, li, &esp->c.le, esp);
+  
+  return ret_pend;
+
 }
 
 static sEseg *
@@ -597,6 +679,7 @@ eseg_build (
   sEseg *mcsp;
   sLink *lp;
   char *p;
+  int ii;
   pwr_tBoolean bcast = bp->c.flags.b.broadcast;
   
   thread_MutexLock(&l.eseg.mutex);
@@ -620,14 +703,15 @@ eseg_build (
       break;
 
     for (
-      msp = NULL, size = bp->b.info.size + sizeof(bp->b.info), p = (char *)&bp->b.info;
+      msp = NULL, size = bp->b.info.size + sizeof(bp->b.info), ii = 0, p = (char *)&bp->b.info;
       size > 0;
-      p += MAX_SEGSIZE, size -= MAX_SEGSIZE
+      ii++, p += MAX_SEGSIZE, size -= MAX_SEGSIZE
     ) {
       sp = eseg_alloc(NULL);
       sp->p = p;
       sp->bp = bp;
       sp->lp = lp;
+      sp->id = ii;
       sp->size = MIN(size, MAX_SEGSIZE);
       sp->head.flags.b.event = eEvent_user;
       sp->head.flags.b.bcast = bcast;
@@ -653,6 +737,7 @@ eseg_build (
       ) {
 	mcsp = NULL;
 	sp = msp;
+	ii = 0;
 	do {
 	  csp = eseg_alloc(NULL);
 	  csp->p = sp->p;
@@ -660,6 +745,7 @@ eseg_build (
 	  csp->lp = lp;
 	  csp->head.flags.m = sp->head.flags.m;
 	  csp->size = sp->size;
+	  csp->id = ii++;
 	  if (mcsp == NULL) {
 	    mcsp = csp;
 	    /* todo initiera msp->le_seg.item = msp */
@@ -1298,17 +1384,21 @@ link_thread (
 )
 {
   uSeg *sp;
+  pwr_tBoolean pending = FALSE;
 
   for ( ; ; ) {
     sp = que_Get(NULL, &lp->q_in, link_tmo(lp), &lp->tmo);
 
     switch (sp->action) {
     case eAction_export:
-      lst_InsertPred(NULL, &lp->lh_send, &sp->c.le, sp);
-      break;
+/*      lst_InsertPred(NULL, &lp->lh_send, &sp->c.le, sp); */
+      pending = clean_insert(&lp->lh_send, (sEseg *) sp, pending);
+      if (pending) continue;
+      else break;
     case eAction_import:
       link_import(lp, &sp->i);
-      break;
+      if (pending) continue;
+      else break;
     case eAction_tmo:
       /* Nothing to do, all is done in link_send. */
       break;