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71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef TIME_FN_H_MODULE_287987
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#define TIME_FN_H_MODULE_287987
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-****************************************
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* Types
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******************************************/
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#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
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# if defined(_AIX)
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# include <inttypes.h>
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# else
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# include <stdint.h> /* uint64_t */
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# endif
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typedef uint64_t PTime; /* Precise Time */
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#else
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typedef unsigned long long PTime; /* does not support compilers without long long support */
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#endif
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/* UTIL_time_t contains a nanosecond time counter.
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* The absolute value is not meaningful.
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* It's only valid to compute the difference between 2 measurements. */
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typedef struct { PTime t; } UTIL_time_t;
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#define UTIL_TIME_INITIALIZER { 0 }
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/*-****************************************
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* Time functions
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******************************************/
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UTIL_time_t UTIL_getTime(void);
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/* Timer resolution can be low on some platforms.
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* To improve accuracy, it's recommended to wait for a new tick
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* before starting benchmark measurements */
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void UTIL_waitForNextTick(void);
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/* tells if timefn will return correct time measurements
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* in presence of multi-threaded workload.
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* note : this is not the case if only C90 clock_t measurements are available */
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int UTIL_support_MT_measurements(void);
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PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd);
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PTime UTIL_clockSpanNano(UTIL_time_t clockStart);
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PTime UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd);
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PTime UTIL_clockSpanMicro(UTIL_time_t clockStart);
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#define SEC_TO_MICRO ((PTime)1000000) /* nb of microseconds in a second */
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#if defined (__cplusplus)
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}
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#endif
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#endif /* TIME_FN_H_MODULE_287987 */
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