Posix EventChannel implementation using epoll. Placeholder for kevents.

Dynamic thread pool EventChannelThreads to serve EventChannel.
Misc cleanup/enhancements.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@480582 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 71 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/AtomicCount.h b/cpp/src/qpid/sys/AtomicCount.h
new file mode 100644
index 0000000000..b625b2c9b0
--- /dev/null
+++ b/cpp/src/qpid/sys/AtomicCount.h
@@ -0,0 +1,71 @@
+#ifndef _posix_AtomicCount_h
+#define _posix_AtomicCount_h
+
+/*
+ *
+ * Copyright (c) 2006 The Apache Software Foundation
+ *
+ * Licensed 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 <boost/detail/atomic_count.hpp>
+#include <boost/noncopyable.hpp>
+
+namespace qpid {
+namespace sys {
+
+/**
+ * Atomic counter.
+ */
+class AtomicCount : boost::noncopyable {
+  public:
+    class ScopedDecrement : boost::noncopyable {
+      public:
+        /** Decrement counter in constructor and increment in destructor. */
+        ScopedDecrement(AtomicCount& c) : count(c) { value = --count; }
+        ~ScopedDecrement() { ++count; }
+        /** Return the value returned by the decrement. */
+        operator long() { return value; }
+      private:
+        AtomicCount& count;
+        long value;
+    };
+
+    class ScopedIncrement : boost::noncopyable {
+      public:
+        /** Increment counter in constructor and increment in destructor. */
+        ScopedIncrement(AtomicCount& c) : count(c) { ++count; }
+        ~ScopedIncrement() { --count; }
+      private:
+        AtomicCount& count;
+    };
+
+    AtomicCount(long value = 0) : count(value) {}
+    
+    void operator++() { ++count ; }
+    
+    long operator--() { return --count; }
+    
+    operator long() const { return count; }
+
+    
+  private:
+    boost::detail::atomic_count  count;
+};
+
+
+}}
+
+
+#endif // _posix_AtomicCount_h