1 files changed, 57 insertions, 0 deletions
diff --git a/src/mongo/db/pipeline/expression_context.cpp b/src/mongo/db/pipeline/expression_context.cpp
new file mode 100755
index 00000000000..0533fc63e7d
--- /dev/null
+++ b/src/mongo/db/pipeline/expression_context.cpp
@@ -0,0 +1,57 @@
+/**
+ * Copyright (c) 2011 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/>.
+ */
+
+#include "pch.h"
+
+#include "db/interrupt_status.h"
+#include "db/pipeline/expression_context.h"
+
+namespace mongo {
+
+    ExpressionContext::~ExpressionContext() {
+    }
+
+    inline ExpressionContext::ExpressionContext(InterruptStatus *pS):
+        doingMerge(false),
+        inShard(false),
+        inRouter(false),
+        intCheckCounter(1),
+        pStatus(pS) {
+    }
+
+    void ExpressionContext::checkForInterrupt() {
+        /*
+          Only really check periodically; the check gets a mutex, and could
+          be expensive, at least in relative terms.
+        */
+        if ((++intCheckCounter % 128) == 0) {
+            pStatus->checkForInterrupt();
+        }
+    }
+
+    ExpressionContext* ExpressionContext::clone() {
+        ExpressionContext* newContext = create(pStatus);
+        newContext->setDoingMerge(getDoingMerge());
+        newContext->setInShard(getInShard());
+        newContext->setInRouter(getInRouter());
+        return newContext;
+    }
+
+    ExpressionContext *ExpressionContext::create(InterruptStatus *pStatus) {
+        return new ExpressionContext(pStatus);
+    }
+
+}