SERVER-17880 Rename OpTime to Timestamp

1 files changed, 82 insertions, 0 deletions

diff --git a/src/mongo/db/global_timestamp.cpp b/src/mongo/db/global_timestamp.cpp
new file mode 100644
index 00000000000..f6cf646ba7e
--- /dev/null
+++ b/src/mongo/db/global_timestamp.cpp
@@ -0,0 +1,82 @@
+/**
+ *    Copyright (C) 2014 MongoDB, 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/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
+
+#include <boost/thread.hpp>
+
+#include "mongo/db/global_timestamp.h"
+#include "mongo/util/concurrency/mutex.h"
+#include "mongo/util/log.h"
+
+namespace {
+    mongo::mutex globalTimestampMutex;
+    mongo::Timestamp globalTimestamp(0, 0);
+
+    bool skewed(const mongo::Timestamp& val) {
+        if (val.getInc() & 0x80000000) {
+            mongo::warning() << "clock skew detected  prev: " << val.getSecs()
+                             << " now: " << (unsigned) time(0) << std::endl;
+            return true;
+        }
+
+        return false;
+    }
+}
+
+namespace mongo {
+    void setGlobalTimestamp(const Timestamp& newTime) {
+        boost::lock_guard<boost::mutex> lk(globalTimestampMutex);
+        globalTimestamp = newTime;
+    }
+
+    Timestamp getLastSetTimestamp() {
+        boost::lock_guard<boost::mutex> lk(globalTimestampMutex);
+        return globalTimestamp;
+    }
+
+    Timestamp getNextGlobalTimestamp() {
+        boost::lock_guard<boost::mutex> lk(globalTimestampMutex);
+
+        const unsigned now = (unsigned) time(0);
+        const unsigned globalSecs = globalTimestamp.getSecs();
+        if ( globalSecs == now ) {
+            globalTimestamp = Timestamp(globalSecs, globalTimestamp.getInc() + 1);
+        }
+        else if ( now < globalSecs ) {
+            globalTimestamp = Timestamp(globalSecs, globalTimestamp.getInc() + 1);
+            // separate function to keep out of the hot code path
+            fassert(17449, !skewed(globalTimestamp));
+        }
+        else {
+            globalTimestamp = Timestamp(now, 1);
+        }
+
+        return globalTimestamp;
+    }
+}