Merged win-pollable-condition branch changes 743545:746056 into trunk

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@746061 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 125 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/windows/PollableCondition.cpp b/cpp/src/qpid/sys/windows/PollableCondition.cpp
new file mode 100644
index 0000000000..ed0f7c3917
--- /dev/null
+++ b/cpp/src/qpid/sys/windows/PollableCondition.cpp
@@ -0,0 +1,125 @@
+#ifndef QPID_SYS_WINDOWS_POLLABLECONDITION_CPP
+#define QPID_SYS_WINDOWS_POLLABLECONDITION_CPP
+
+/*
+ *
+ * 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/PollableCondition.h"
+#include "qpid/sys/IOHandle.h"
+#include "AsynchIoResult.h"
+#include "IoHandlePrivate.h"
+
+#include <boost/bind.hpp>
+#include <windows.h>
+
+namespace qpid {
+namespace sys {
+
+// PollableConditionPrivate will reuse the IocpPoller's ability to queue
+// a completion to the IOCP and have it dispatched to the completer callback
+// noted in the IOHandlePrivate when the request is queued. The
+// AsynchCallbackRequest object is not really used - we already have the
+// desired callback for the user of PollableCondition.
+class PollableConditionPrivate : private IOHandle {
+    friend class PollableCondition;
+
+private:
+    PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
+                             sys::PollableCondition& parent,
+                             const boost::shared_ptr<sys::Poller>& poller);
+    ~PollableConditionPrivate();
+
+    void poke();
+    void dispatch(AsynchIoResult *result);
+
+private:
+    PollableCondition::Callback cb;
+    PollableCondition& parent;
+    boost::shared_ptr<sys::Poller> poller;
+    LONG isSet;
+    LONG armed;
+};
+
+PollableConditionPrivate::PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
+                                                   sys::PollableCondition& parent,
+                                                   const boost::shared_ptr<sys::Poller>& poller)
+  : IOHandle(new sys::IOHandlePrivate(INVALID_SOCKET,
+                                      boost::bind(&PollableConditionPrivate::dispatch, this, _1))),
+    cb(cb), parent(parent), poller(poller), isSet(0), armed(0)
+{
+}
+
+PollableConditionPrivate::~PollableConditionPrivate()
+{
+}
+
+void PollableConditionPrivate::poke()
+{
+    if (!armed)
+        return;
+
+    // addFd will queue a completion for the IOCP; when it's handled, a
+    // poller thread will call back to dispatch() below.
+    PollerHandle ph(*this);
+    poller->addFd(ph, Poller::INPUT);
+}
+
+void PollableConditionPrivate::dispatch(AsynchIoResult *result)
+{
+    delete result;       // Poller::addFd() allocates this
+    cb(parent);
+}
+
+  /* PollableCondition */
+
+PollableCondition::PollableCondition(const Callback& cb,
+                                     const boost::shared_ptr<sys::Poller>& poller)
+  : impl(new PollableConditionPrivate(cb, *this, poller))
+{
+}
+
+PollableCondition::~PollableCondition()
+{
+    delete impl;
+}
+
+void PollableCondition::set() {
+    // Add one to the set count and poke it to provoke a callback
+    ::InterlockedIncrement(&impl->isSet);
+    impl->poke();
+}
+
+bool PollableCondition::clear() {
+    return (0 != ::InterlockedExchange(&impl->isSet, 0));
+}
+
+void PollableCondition::disarm() {
+    ::InterlockedExchange(&impl->armed, 0);
+}
+
+void PollableCondition::rearm() {
+    if (0 == ::InterlockedExchange(&impl->armed, 1) && impl->isSet)
+        impl->poke();
+}
+
+}} // namespace qpid::sys
+
+#endif  /*!QPID_SYS_WINDOWS_POLLABLECONDITION_CPP*/