1 files changed, 59 insertions, 0 deletions
diff --git a/cpp/src/qpid/cluster/PollableCondition.cpp b/cpp/src/qpid/cluster/PollableCondition.cpp
new file mode 100644
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+++ b/cpp/src/qpid/cluster/PollableCondition.cpp
@@ -0,0 +1,59 @@
+#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.
+ *
+ */
+
+// Linux implementation of PollableCondition using the conditionfd(2) system call.
+
+// FIXME aconway 2008-08-11: this could be of more general interest,
+// move to common lib.
+// 
+
+#include "qpid/sys/posix/PrivatePosix.h"
+#include "qpid/cluster/PollableCondition.h"
+#include "qpid/Exception.h"
+#include <sys/eventfd.h>
+
+namespace qpid {
+namespace cluster {
+
+PollableCondition::PollableCondition() : IOHandle(new sys::IOHandlePrivate) {
+    impl->fd = ::eventfd(0, 0);
+    if (impl->fd < 0) throw ErrnoException("conditionfd() failed");
+}
+
+bool PollableCondition::clear() {
+    char buf[8];
+    ssize_t n = ::read(impl->fd, buf, 8);
+    if (n != 8) throw ErrnoException("read failed on conditionfd");
+    return *reinterpret_cast<uint64_t*>(buf);
+}
+
+void PollableCondition::set() {
+    static const uint64_t value=1;
+    ssize_t n = ::write(impl->fd, reinterpret_cast<const void*>(&value), 8);
+    if (n != 8) throw ErrnoException("write failed on conditionfd");
+}
+    
+}} // namespace qpid::cluster
+
+#endif  /*!QPID_SYS_LINUX_POLLABLECONDITION_CPP*/