Moved PollableCondition, PollableQueue and to sys. Fixed cluster shutdown issues.

sys/PollableCondition: is a generic mechansim to poll for non-IO
events in the Poller.

sys/PollableQueue: is a thread-safe queue template that can be
dispatched from the Poller when there are items on the queue. It uses
PollableCondition.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@694243 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 60 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/PollableCondition.h b/cpp/src/qpid/sys/PollableCondition.h
new file mode 100644
index 0000000000..6f0e12a474
--- /dev/null
+++ b/cpp/src/qpid/sys/PollableCondition.h
@@ -0,0 +1,60 @@
+#ifndef QPID_SYS_POLLABLECONDITION_H
+#define QPID_SYS_POLLABLECONDITION_H
+
+/*
+ *
+ * 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 "qpid/sys/IOHandle.h"
+
+// FIXME aconway 2008-08-11: this could be of more general interest,
+// move to sys namespace in common lib. 
+// 
+
+namespace qpid {
+namespace sys {
+
+/**
+ * A pollable condition to integrate in-process conditions with IO
+ * conditions in a polling loop.
+ *
+ * Setting the condition makes it readable for a poller.
+ * 
+ * Writable/disconnected conditions are undefined and should not be
+ * polled for.
+ */
+class PollableCondition : public sys::IOHandle {
+  public:
+    PollableCondition();
+
+    /** Set the condition, triggers readable in a poller. */ 
+    void set();
+
+    /** Get the current state of the condition, then clear it.
+     *@return The state of the condition before it was cleared.
+     */
+    bool clear();
+
+  private:
+    int writeFd;
+};
+}} // namespace qpid::sys
+
+#endif  /*!QPID_SYS_POLLABLECONDITION_H*/