# HG changeset patch
# User Sean Halle <seanhalle@yahoo.com>
# Date 1339030859 25200
# Node ID b9cb01d8ce569a10a031cf37d2aec59b7b12c621
# Parent  3f5e365143fd46dde395bf6ec9bd67395022277c
First working version

diff -r 3f5e365143fd -r b9cb01d8ce56 PrivateQueue.c
--- a/PrivateQueue.c	Wed Mar 14 23:22:00 2012 -0700
+++ b/PrivateQueue.c	Wed Jun 06 18:00:59 2012 -0700
@@ -30,7 +30,7 @@
    retQ = (PrivQueueStruc *) VMS_int__malloc( sizeof( PrivQueueStruc ) );
 
       //This malloc is not safe to use in wrapper lib nor app code!
-   retQ->startOfData = VMS_WL__malloc( 1024 * sizeof(void *) );
+   retQ->startOfData = VMS_int__malloc( 1024 * sizeof(void *) );
    memset( retQ->startOfData, 0, 1024 * sizeof(void *) );
    retQ->extractPos = &(retQ->startOfData[0]); //side by side == empty
    retQ->insertPos  = &(retQ->startOfData[1]); // so start pos's have to be
@@ -103,6 +103,48 @@
  }
 
 
+/*Returns TRUE when queue is empty
+ */
+bool32 isEmptyPrivQ( PrivQueueStruc* Q )
+ { void *out    = 0;
+   void **startOfData = Q->startOfData;
+   void **endOfData   = Q->endOfData;
+
+   void **insertPos  = Q->insertPos;
+   void **extractPos = Q->extractPos;
+
+      //if not empty -- (extract is just below insert when empty)
+   if( insertPos - extractPos != 1 &&
+       !(extractPos == endOfData && insertPos == startOfData))
+    { 
+      return FALSE;
+    }
+      //Q is empty
+   return TRUE;
+ }
+
+/*Returns NULL when queue is empty
+ */
+void* peekPrivQ( PrivQueueStruc* Q )
+ { void *out    = 0;
+   void **startOfData = Q->startOfData;
+   void **endOfData   = Q->endOfData;
+
+   void **insertPos  = Q->insertPos;
+   void **extractPos = Q->extractPos;
+
+      //if not empty -- (extract is just below insert when empty)
+   if( insertPos - extractPos != 1 &&
+       !(extractPos == endOfData && insertPos == startOfData))
+    { 
+      out = *(Q->extractPos);
+      return out;
+    }
+      //Q is empty
+   return NULL;
+ }
+
+
 /*Returns NULL when queue is empty
  */
 void* readPrivQ( PrivQueueStruc* Q )
diff -r 3f5e365143fd -r b9cb01d8ce56 PrivateQueue.h
--- a/PrivateQueue.h	Wed Mar 14 23:22:00 2012 -0700
+++ b/PrivateQueue.h	Wed Jun 06 18:00:59 2012 -0700
@@ -32,6 +32,8 @@
 typedef void  (*DynArrayFnPtr)  ( void * );  //fn has to cast void *
 
 PrivQueueStruc*  makePrivQ ( );
+bool32           isEmptyPrivQ ( PrivQueueStruc *Q ); //ret TRUE if empty
+void*            peekPrivQ ( PrivQueueStruc *Q ); //ret NULL if empty
 void*            readPrivQ ( PrivQueueStruc *Q ); //ret NULL if empty
 void             writePrivQ( void *in, PrivQueueStruc *Q );
                     //return false when full