MPI_Win_{attach,detach} : add Java bindings

ompi/mpi/java/c/mpi_Win.c

@@ -55,6 +55,29 @@ JNIEXPORT jlong JNICALL Java_mpi_Win_create_dynamicWin(
     return (jlong)win;
 }
 
+JNIEXPORT void JNICALL Java_mpi_Win_attach(
+        JNIEnv *env, jobject jthis, jobject jBase,
+        jint size)
+{
+    void *base = (*env)->GetDirectBufferAddress(env, jBase);
+    MPI_Win win;
+
+    int rc = MPI_Win_attach(win, base, (MPI_Aint)size);
+
+    ompi_java_exceptionCheck(env, rc);
+}
+
+JNIEXPORT void JNICALL Java_mpi_Win_detach(
+        JNIEnv *env, jobject jthis, jobject jBase)
+{
+    void *base = (*env)->GetDirectBufferAddress(env, jBase);
+    MPI_Win win;
+
+    int rc = MPI_Win_detach(win, base);
+
+    ompi_java_exceptionCheck(env, rc);
+}
+
 JNIEXPORT jlong JNICALL Java_mpi_Win_getGroup(
         JNIEnv *env, jobject jthis, jlong win)
 {

ompi/mpi/java/java/Win.java

@@ -97,6 +97,51 @@ private int getBaseType(Datatype orgType, Datatype targetType)
     return baseType;
 }
 
+/**
+ * Java binding of {@code MPI_WIN_ATTACH}.
+ * @param assertion program assertion
+ */
+public void attach(Buffer base, int size) throws MPIException
+{
+    MPI.check();
+    if(!base.isDirect())
+        throw new IllegalArgumentException("The buffer must be direct.");
+
+    int baseSize;
+
+    if(base instanceof ByteBuffer)
+        baseSize = 1;
+    else if(base instanceof CharBuffer || base instanceof ShortBuffer)
+        baseSize = 2;
+    else if(base instanceof IntBuffer || base instanceof FloatBuffer)
+        baseSize = 4;
+    else if(base instanceof LongBuffer || base instanceof DoubleBuffer)
+        baseSize = 8;
+    else
+        throw new AssertionError();
+
+    int sizeBytes = size * baseSize,
+
+    attach(handle, base, size);
+}
+
+private native void attach(long win, Buffer base, int size) throws MPIException;
+
+/**
+ * Java binding of {@code MPI_WIN_DETACH}.
+ * @param assertion program assertion
+ */
+public void detach(Buffer base) throws MPIException
+{
+    MPI.check();
+    if(!base.isDirect())
+        throw new IllegalArgumentException("The buffer must be direct.");
+
+    detach(handle, base);
+}
+
+private native void detach(long win, Buffer base) throws MPIException;
+
 /**
  * Java binding of the MPI operation {@code MPI_GET_GROUP}.
  * @return group of processes which share access to the window