1 files changed, 124 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/sys/posix/PollableCondition.cpp b/qpid/cpp/src/qpid/sys/posix/PollableCondition.cpp
new file mode 100644
index 0000000000..b22a615a54
--- /dev/null
+++ b/qpid/cpp/src/qpid/sys/posix/PollableCondition.cpp
@@ -0,0 +1,124 @@
+#ifndef QPID_SYS_LINUX_POLLABLECONDITION_CPP
+#define QPID_SYS_LINUX_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/DispatchHandle.h"
+#include "qpid/sys/IOHandle.h"
+#include "qpid/sys/posix/PrivatePosix.h"
+#include "qpid/Exception.h"
+
+#include <boost/bind.hpp>
+
+#include <unistd.h>
+#include <fcntl.h>
+
+namespace qpid {
+namespace sys {
+
+class PollableConditionPrivate : public sys::IOHandle {
+    friend class PollableCondition;
+
+private:
+    PollableConditionPrivate(const sys::PollableCondition::Callback& cb,
+                             sys::PollableCondition& parent,
+                             const boost::shared_ptr<sys::Poller>& poller);
+    ~PollableConditionPrivate();
+
+    void dispatch(sys::DispatchHandle& h);
+    void set();
+    void clear();
+
+private:
+    PollableCondition::Callback cb;
+    PollableCondition& parent;
+    boost::shared_ptr<sys::Poller> poller;
+    int writeFd;
+    std::auto_ptr<DispatchHandleRef> handle;
+};
+
+PollableConditionPrivate::PollableConditionPrivate(
+    const sys::PollableCondition::Callback& cb,
+    sys::PollableCondition& parent,
+    const boost::shared_ptr<sys::Poller>& poller
+) : IOHandle(new sys::IOHandlePrivate), cb(cb), parent(parent)
+{
+    int fds[2];
+    if (::pipe(fds) == -1)
+        throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
+    impl->fd = fds[0];
+    writeFd = fds[1];
+    if (::fcntl(impl->fd, F_SETFL, O_NONBLOCK) == -1)
+        throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
+    if (::fcntl(writeFd, F_SETFL, O_NONBLOCK) == -1)
+        throw ErrnoException(QPID_MSG("Can't create PollableCondition"));
+    handle.reset (new DispatchHandleRef(
+                      *this,
+                      boost::bind(&sys::PollableConditionPrivate::dispatch, this, _1),
+                      0, 0));
+    handle->startWatch(poller);
+    handle->unwatch();
+
+    // Make the read FD readable
+    static const char dummy=0;
+    ssize_t n = ::write(writeFd, &dummy, 1);
+    if (n == -1 && errno != EAGAIN)
+        throw ErrnoException("Error setting PollableCondition");
+}
+
+PollableConditionPrivate::~PollableConditionPrivate() {
+    handle->stopWatch();
+    close(writeFd);
+}
+
+void PollableConditionPrivate::dispatch(sys::DispatchHandle&) {
+    cb(parent);
+}
+
+void PollableConditionPrivate::set() {
+    handle->rewatch();
+}
+
+void PollableConditionPrivate::clear() {
+    handle->unwatch();
+}
+
+
+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() { impl->set(); }
+
+void PollableCondition::clear() { impl->clear(); }
+
+}} // namespace qpid::sys
+
+#endif  /*!QPID_SYS_LINUX_POLLABLECONDITION_CPP*/