1 files changed, 46 insertions, 0 deletions
diff --git a/src/mongo/util/timer-posixclock-inl.h b/src/mongo/util/timer-posixclock-inl.h
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+++ b/src/mongo/util/timer-posixclock-inl.h
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+/*    Copyright 2010 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.
+ */
+
+/**
+ * Inline function implementations for timers on systems that support the
+ * POSIX clock API and CLOCK_MONOTONIC clock.
+ *
+ * This file should only be included through timer-inl.h, which selects the
+ * particular implementation based on target platform.
+ */
+
+#define MONGO_TIMER_IMPL_POSIX_MONOTONIC_CLOCK
+
+#include <ctime>
+
+#include "mongo/util/assert_util.h"
+
+namespace mongo {
+
+    unsigned long long Timer::now() const {
+        timespec the_time;
+        unsigned long long result;
+
+        fassert(16160, !clock_gettime(CLOCK_MONOTONIC, &the_time));
+
+        // Safe for 292 years after the clock epoch, even if we switch to a signed time value.  On
+        // Linux, the monotonic clock's epoch is the UNIX epoch.
+        result = static_cast<unsigned long long>(the_time.tv_sec);
+        result *= nanosPerSecond;
+        result += static_cast<unsigned long long>(the_time.tv_nsec);
+        return result;
+    }
+
+}  // namespace mongo