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