1 files changed, 64 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/sys/LockFile.h b/qpid/cpp/src/qpid/sys/LockFile.h
new file mode 100644
index 0000000000..14a76cbf3e
--- /dev/null
+++ b/qpid/cpp/src/qpid/sys/LockFile.h
@@ -0,0 +1,64 @@
+#ifndef _sys_LockFile_h
+#define _sys_LockFile_h
+
+/*
+ *
+ * Copyright (c) 2008 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/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <string>
+
+#include "qpid/CommonImportExport.h"
+#include "qpid/sys/IntegerTypes.h"
+
+namespace qpid {
+namespace sys {
+
+class LockFilePrivate;
+
+/**
+ * @class LockFile
+ *
+ * LockFile represents a locked file suitable for a coarse-grain system
+ * lock. For example, the broker uses this to ensure that only one broker
+ * runs. A common usage idiom is to store the current "owner" process ID
+ * in the lock file - if the lock file exists, but the stored process ID
+ * doesn't, the old owner has probably died without cleaning up the lock
+ * file.
+ */
+class LockFile : private boost::noncopyable
+{
+    std::string path;
+    bool created;
+    boost::shared_ptr<LockFilePrivate> impl;
+
+protected:
+    int read(void*, size_t) const;
+    int write(void*, size_t) const;
+
+public:
+    QPID_COMMON_EXTERN LockFile(const std::string& path_, bool create);
+    QPID_COMMON_EXTERN ~LockFile();
+};
+ 
+}}   /* namespace qpid::sys */
+
+#endif /*!_sys_LockFile_h*/
+
+
+