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expkg/vendor/lz4/programs/timefn.h

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+/*
+  timefn.h - portable time measurement functions
+  Copyright (c) Yann Collet. All rights reserved.
+
+  GPL v2 License
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along
+  with this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+  You can contact the author at :
+  - LZ4 source repository : https://github.com/lz4/lz4
+  - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
+*/
+
+#ifndef TIMEFN
+#define TIMEFN
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/*-****************************************
+ *  Types
+ ******************************************/
+
+typedef unsigned long long Duration_ns;
+
+/* TIME_t contains a nanosecond time counter.
+ * The absolute value is not meaningful.
+ * It's only valid to compute Duration_ns between 2 measurements. */
+typedef struct {
+    Duration_ns t;
+} TIME_t;
+#define TIME_INITIALIZER { 0 }
+
+/*-****************************************
+ *  Time functions
+ ******************************************/
+
+/* @return a TIME_t value to be compared to another one in order to compute a duration.
+ * The absolute value returned is meaningless */
+TIME_t TIME_getTime(void);
+
+/* Timer resolution can be low on some platforms.
+ * To improve accuracy, it's recommended to wait for a new tick
+ * before starting benchmark measurements */
+void TIME_waitForNextTick(void);
+
+/* tells if TIME_getTime() returns correct time measurements
+ * in scenarios involving multi-threaded workload.
+ * note : this is not the case if only C90 clock_t measurements are available */
+int TIME_support_MT_measurements(void);
+
+Duration_ns TIME_span_ns(TIME_t clockStart, TIME_t clockEnd);
+Duration_ns TIME_clockSpan_ns(TIME_t clockStart);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* TIMEFN */