1.1 --- a/PrivateQueue.c	Wed Mar 14 23:22:00 2012 -0700
     1.2 +++ b/PrivateQueue.c	Wed Jun 06 18:00:59 2012 -0700
     1.3 @@ -30,7 +30,7 @@
     1.4     retQ = (PrivQueueStruc *) VMS_int__malloc( sizeof( PrivQueueStruc ) );
     1.5  
     1.6        //This malloc is not safe to use in wrapper lib nor app code!
     1.7 -   retQ->startOfData = VMS_WL__malloc( 1024 * sizeof(void *) );
     1.8 +   retQ->startOfData = VMS_int__malloc( 1024 * sizeof(void *) );
     1.9     memset( retQ->startOfData, 0, 1024 * sizeof(void *) );
    1.10     retQ->extractPos = &(retQ->startOfData[0]); //side by side == empty
    1.11     retQ->insertPos  = &(retQ->startOfData[1]); // so start pos's have to be
    1.12 @@ -103,6 +103,48 @@
    1.13   }
    1.14  
    1.15  
    1.16 +/*Returns TRUE when queue is empty
    1.17 + */
    1.18 +bool32 isEmptyPrivQ( PrivQueueStruc* Q )
    1.19 + { void *out    = 0;
    1.20 +   void **startOfData = Q->startOfData;
    1.21 +   void **endOfData   = Q->endOfData;
    1.22 +
    1.23 +   void **insertPos  = Q->insertPos;
    1.24 +   void **extractPos = Q->extractPos;
    1.25 +
    1.26 +      //if not empty -- (extract is just below insert when empty)
    1.27 +   if( insertPos - extractPos != 1 &&
    1.28 +       !(extractPos == endOfData && insertPos == startOfData))
    1.29 +    { 
    1.30 +      return FALSE;
    1.31 +    }
    1.32 +      //Q is empty
    1.33 +   return TRUE;
    1.34 + }
    1.35 +
    1.36 +/*Returns NULL when queue is empty
    1.37 + */
    1.38 +void* peekPrivQ( PrivQueueStruc* Q )
    1.39 + { void *out    = 0;
    1.40 +   void **startOfData = Q->startOfData;
    1.41 +   void **endOfData   = Q->endOfData;
    1.42 +
    1.43 +   void **insertPos  = Q->insertPos;
    1.44 +   void **extractPos = Q->extractPos;
    1.45 +
    1.46 +      //if not empty -- (extract is just below insert when empty)
    1.47 +   if( insertPos - extractPos != 1 &&
    1.48 +       !(extractPos == endOfData && insertPos == startOfData))
    1.49 +    { 
    1.50 +      out = *(Q->extractPos);
    1.51 +      return out;
    1.52 +    }
    1.53 +      //Q is empty
    1.54 +   return NULL;
    1.55 + }
    1.56 +
    1.57 +
    1.58  /*Returns NULL when queue is empty
    1.59   */
    1.60  void* readPrivQ( PrivQueueStruc* Q )

     2.1 --- a/PrivateQueue.h	Wed Mar 14 23:22:00 2012 -0700
     2.2 +++ b/PrivateQueue.h	Wed Jun 06 18:00:59 2012 -0700
     2.3 @@ -32,6 +32,8 @@
     2.4  typedef void  (*DynArrayFnPtr)  ( void * );  //fn has to cast void *
     2.5  
     2.6  PrivQueueStruc*  makePrivQ ( );
     2.7 +bool32           isEmptyPrivQ ( PrivQueueStruc *Q ); //ret TRUE if empty
     2.8 +void*            peekPrivQ ( PrivQueueStruc *Q ); //ret NULL if empty
     2.9  void*            readPrivQ ( PrivQueueStruc *Q ); //ret NULL if empty
    2.10  void             writePrivQ( void *in, PrivQueueStruc *Q );
    2.11                      //return false when full