Comm.reduceLocal: add missing offset artifact

This commit was SVN r30108.

ompi/mpi/java/c/mpi_Comm.c

@@ -1965,18 +1965,17 @@ JNIEXPORT jlong JNICALL Java_mpi_Comm_iReduceScatterBlock(
     return (jlong)request;
 }
 
-JNIEXPORT void JNICALL Java_mpi_Comm_reduceLocal_1jni(
-                       JNIEnv *env, jobject jthis,
-                       jobject inbuf, jobject inoutbuf,
-                       jint count, jobject type, jobject op)
+JNIEXPORT void JNICALL Java_mpi_Comm_reduceLocal(
+        JNIEnv *env, jobject jthis, jobject inbuf, jint inoff,
+        jobject inoutbuf, jint inoutoff, jint count, jobject type, jobject op)
 {
     MPI_Datatype mpi_type =
         (MPI_Datatype)((*env)->GetLongField(env,type,ompi_java.DatatypeHandle));
 
     int baseType = (*env)->GetIntField(env, type, ompi_java.DatatypeBaseType);
     void *inptr, *inbase, *inoutptr, *inoutbase;
-    inptr = ompi_java_getBufPtr(&inbase, env, inbuf, baseType, 0);
-    inoutptr = ompi_java_getBufPtr(&inoutbase, env, inoutbuf, baseType, 0);
+    inptr = ompi_java_getBufPtr(&inbase, env, inbuf, baseType, inoff);
+    inoutptr = ompi_java_getBufPtr(&inoutbase, env, inoutbuf, baseType, inoutoff);
 
     int rc = MPI_Reduce_local(inptr, inoutptr, count, mpi_type,
                               ompi_java_op_getHandle(env, op, baseType));

ompi/mpi/java/java/Comm.java

@@ -2631,12 +2631,28 @@ public final void reduceLocal(Object inbuf, Object inoutbuf, int count,
 {
     MPI.check();
     op.setDatatype(type);
-    reduceLocal_jni(inbuf, inoutbuf, count, type, op);
+
+    int inoff    = 0,
+        inoutoff = 0;
+
+    if(isHeapBuffer(inbuf))
+    {
+        inoff = ((Buffer)inbuf).arrayOffset();
+        inbuf = ((Buffer)inbuf).array();
+    }
+
+    if(isHeapBuffer(inoutbuf))
+    {
+        inoutoff = ((Buffer)inoutbuf).arrayOffset();
+        inoutbuf = ((Buffer)inoutbuf).array();
+    }
+
+    reduceLocal(inbuf, inoff, inoutbuf, inoutoff, count, type, op);
 }
 
-private native void reduceLocal_jni(Object inbuf, Object inoutbuf, int count,
-                                    Datatype datatype, Op op)
-                                    throws MPIException;
+private native void reduceLocal(
+        Object inbuf, int inoff, Object inoutbuf, int inoutoff,
+        int count, Datatype datatype, Op op) throws MPIException;
 
 /**
  * Sets the print name for the communicator.