Intermediate checkin with preliminary work on epoll based net IO

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@548337 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 90 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/Dispatcher.cpp b/cpp/src/qpid/sys/Dispatcher.cpp
new file mode 100644
index 0000000000..4838e5e4cd
--- /dev/null
+++ b/cpp/src/qpid/sys/Dispatcher.cpp
@@ -0,0 +1,90 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+#include "Dispatcher.h"
+
+#include <assert.h>
+
+namespace qpid {
+namespace sys {
+
+Dispatcher::Dispatcher(Poller::shared_ptr poller0) :
+  poller(poller0) {
+}
+
+Dispatcher::~Dispatcher() {
+}
+    
+void Dispatcher::run() {
+    do {
+        Poller::Event event = poller->wait();
+        // Poller::wait guarantees to return an event
+        DispatchHandle* h = static_cast<DispatchHandle*>(event.handle);
+        switch (event.dir) {
+        case Poller::IN:
+            h->readableCallback(*h);
+            break;
+        case Poller::OUT:
+            h->writableCallback(*h);
+            break;
+        case Poller::INOUT:
+            h->readableCallback(*h);
+            h->writableCallback(*h);
+            break;
+        case Poller::SHUTDOWN:
+            goto dispatcher_shutdown;
+        default:
+            ;
+        }
+    } while (true);
+    
+dispatcher_shutdown:
+    ;
+}
+
+void DispatchHandle::watch(Poller::shared_ptr poller0) {
+    bool r = readableCallback;
+    bool w = writableCallback;
+    
+    // If no callbacks set then do nothing (that is what we were asked to do!)
+    // TODO: Maybe this should be an assert instead
+    if (!r && !w)
+        return;
+
+    Poller::Direction d = r ?
+        (w ? Poller::INOUT : Poller::IN) :
+        Poller::OUT;
+
+    poller = poller0;
+    poller->addFd(*this, d);
+}
+
+void DispatchHandle::rewatch() {
+    assert(poller);
+    poller->rearmFd(*this);
+}
+
+void DispatchHandle::unwatch() {
+    poller->delFd(*this);
+    poller.reset();
+}
+
+}}