[pcsx_rearmed.git] / deps / libchdr / deps / zstd-1.5.5 / programs / timefn.h

/*
 * 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 */
Commit	Line	Data
648db22b	1	/*
	2	* Copyright (c) Meta Platforms, Inc. and affiliates.
	3	* All rights reserved.
	4	*
	5	* This source code is licensed under both the BSD-style license (found in the
	6	* LICENSE file in the root directory of this source tree) and the GPLv2 (found
	7	* in the COPYING file in the root directory of this source tree).
	8	* You may select, at your option, one of the above-listed licenses.
	9	*/
	10
	11	#ifndef TIME_FN_H_MODULE_287987
	12	#define TIME_FN_H_MODULE_287987
	13
	14	#if defined (__cplusplus)
	15	extern "C" {
	16	#endif
	17
	18
	19
	20	/-***************************************
	21	* Types
	22	******************************************/
	23
	24	#if !defined (__VMS) && (defined (__cplusplus) \|\| (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
	25	# if defined(_AIX)
	26	# include <inttypes.h>
	27	# else
	28	# include <stdint.h> /* uint64_t */
	29	# endif
	30	typedef uint64_t PTime; /* Precise Time */
	31	#else
	32	typedef unsigned long long PTime; /* does not support compilers without long long support */
	33	#endif
	34
	35	/* UTIL_time_t contains a nanosecond time counter.
	36	* The absolute value is not meaningful.
	37	* It's only valid to compute the difference between 2 measurements. */
	38	typedef struct { PTime t; } UTIL_time_t;
	39	#define UTIL_TIME_INITIALIZER { 0 }
	40
	41
	42	/-***************************************
	43	* Time functions
	44	******************************************/
	45
	46	UTIL_time_t UTIL_getTime(void);
	47
	48	/* Timer resolution can be low on some platforms.
	49	* To improve accuracy, it's recommended to wait for a new tick
	50	* before starting benchmark measurements */
	51	void UTIL_waitForNextTick(void);
	52	/* tells if timefn will return correct time measurements
	53	* in presence of multi-threaded workload.
	54	* note : this is not the case if only C90 clock_t measurements are available */
	55	int UTIL_support_MT_measurements(void);
	56
	57	PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd);
	58	PTime UTIL_clockSpanNano(UTIL_time_t clockStart);
	59
	60	PTime UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd);
	61	PTime UTIL_clockSpanMicro(UTIL_time_t clockStart);
	62
	63	#define SEC_TO_MICRO ((PTime)1000000) /* nb of microseconds in a second */
	64
65
66	#if defined (__cplusplus)
67	}
68	#endif
69
70	#endif /* TIME_FN_H_MODULE_287987 */