bulk move of code to src/ SERVER-4551

1 files changed, 56 insertions, 0 deletions

diff --git a/src/mongo/db/background.h b/src/mongo/db/background.h
new file mode 100644
index 00000000000..ea424c97107
--- /dev/null
+++ b/src/mongo/db/background.h
@@ -0,0 +1,56 @@
+/**
+*    Copyright (C) 2010 10gen Inc.
+*
+*    This program is free software: you can redistribute it and/or  modify
+*    it under the terms of the GNU Affero General Public License, version 3,
+*    as published by the Free Software Foundation.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU Affero General Public License for more details.
+*
+*    You should have received a copy of the GNU Affero General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* background.h
+
+   Concurrency coordination for administrative operations.
+*/
+
+#pragma once
+
+namespace mongo {
+
+    /* these are administrative operations / jobs
+       for a namespace running in the background, and that only one
+       at a time per namespace is permitted, and that if in progress,
+       you aren't allowed to do other NamespaceDetails major manipulations
+       (such as dropping ns or db) even in the foreground and must
+       instead uassert.
+
+       It's assumed this is not for super-high RPS things, so we don't do
+       anything special in the implementation here to be fast.
+    */
+    class BackgroundOperation : public boost::noncopyable {
+    public:
+        static bool inProgForDb(const char *db);
+        static bool inProgForNs(const char *ns);
+        static void assertNoBgOpInProgForDb(const char *db);
+        static void assertNoBgOpInProgForNs(const char *ns);
+        static void dump(stringstream&);
+
+        /* check for in progress before instantiating */
+        BackgroundOperation(const char *ns);
+
+        virtual ~BackgroundOperation();
+
+    private:
+        NamespaceString _ns;
+        static map<string, unsigned> dbsInProg;
+        static set<string> nsInProg;
+    };
+
+} // namespace mongo
+