Imported Upstream version 1.3.1

1 files changed, 63 insertions, 0 deletions

diff --git a/util/mmap.h b/util/mmap.h
new file mode 100644
index 0000000..ed4ca99
--- /dev/null
+++ b/util/mmap.h
@@ -0,0 +1,63 @@
+// mmap.h
+
+/*    Copyright 2009 10gen Inc.
+ *
+ *    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.
+ */
+
+#pragma once
+
+namespace mongo {
+
+    class MemoryMappedFile {
+    public:
+
+        MemoryMappedFile();
+        ~MemoryMappedFile(); /* closes the file if open */
+        void close();
+        
+        // Throws exception if file doesn't exist.
+        void* map( const char *filename );
+
+        /* Creates with length if DNE, otherwise uses existing file length,
+           passed length.
+        */
+        void* map(const char *filename, long &length);
+
+        void flush(bool sync);
+
+        void* viewOfs() {
+            return view;
+        }
+
+        long length() {
+            return len;
+        }
+        
+        static void updateLength( const char *filename, long &length );
+        
+        static long long totalMappedLength();
+        static void closeAllFiles( stringstream &message );
+        static int flushAll( bool sync );
+
+    private:
+        void created();
+        
+        HANDLE fd;
+        HANDLE maphandle;
+        void *view;
+        long len;
+    };
+    
+
+} // namespace mongo