Imported Upstream version 1.57.0upstream/1.57.0

1 files changed, 99 insertions, 0 deletions

diff --git a/boost/log/detail/timestamp.hpp b/boost/log/detail/timestamp.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * Distributed under the Boost Software License, Version 1.0.
+ *    (See accompanying file LICENSE_1_0.txt or copy at
+ *          http://www.boost.org/LICENSE_1_0.txt)
+ */
+/*!
+ * \file   timestamp.hpp
+ * \author Andrey Semashev
+ * \date   31.07.2011
+ *
+ * \brief  This header is the Boost.Log library implementation, see the library documentation
+ *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_
+
+#include <boost/cstdint.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+/*!
+ * Duration between two timestamps
+ */
+class duration
+{
+    int64_t m_ticks;
+
+public:
+    explicit duration(int64_t ticks = 0) : m_ticks(ticks) {}
+
+#if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+    int64_t milliseconds() const { return m_ticks; }
+#else
+    BOOST_LOG_API int64_t milliseconds() const;
+#endif
+};
+
+/*!
+ * Opaque timestamp class
+ */
+class timestamp
+{
+    uint64_t m_ticks;
+
+public:
+    explicit timestamp(uint64_t ticks = 0) : m_ticks(ticks) {}
+
+    duration operator- (timestamp that) const
+    {
+        return duration(m_ticks - that.m_ticks);
+    }
+};
+
+/*!
+ * \fn get_timestamp
+ *
+ * The function returns a timestamp, in opaque units since an unspecified
+ * time point. This timer is guaranteed to be monotonic, it should not
+ * be affected by clock changes, either manual or seasonal. Also, it
+ * should be as fast as possible.
+ */
+#if defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+typedef uint64_t (__stdcall* get_tick_count_t)();
+extern BOOST_LOG_API get_tick_count_t get_tick_count;
+
+inline timestamp get_timestamp()
+{
+    return timestamp(get_tick_count());
+}
+
+#else
+
+typedef timestamp (*get_timestamp_t)();
+extern BOOST_LOG_API get_timestamp_t get_timestamp;
+
+#endif
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_DETAIL_TIMESTAMP_HPP_INCLUDED_