1 files changed, 48 insertions, 0 deletions
diff --git a/src/mongo/util/timer-inl.h b/src/mongo/util/timer-inl.h
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+++ b/src/mongo/util/timer-inl.h
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+// @file mongo/util/timer-inl.h
+
+/*    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 the Timer class.  This file simply selects
+ * the platform-appropriate inline functions to include.
+ *
+ * This file should only be included through timer-inl.h, which selects the
+ * particular implementation based on target platform.
+ */
+
+#pragma once
+
+#if defined(MONGO_HAVE_HEADER_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#if defined(_WIN32)
+
+// On Windows, prefer the Windows-specific implementation, which employs QueryPerformanceCounter.
+#include "mongo/util/timer-win32-inl.h"
+
+#elif defined(_POSIX_TIMERS) and _POSIX_TIMERS > 0 and defined(_POSIX_MONOTONIC_CLOCK) and _POSIX_MONOTONIC_CLOCK > 0
+
+// On systems that support the POSIX clock_gettime function, and the "monotonic" clock,
+// use those.
+#include "mongo/util/timer-posixclock-inl.h"
+
+#else
+
+// If all else fails, fall back to a generic implementation.  Performance may suffer.
+#include "mongo/util/timer-generic-inl.h"
+
+#endif