1/*
2 * Copyright (c) Yann Collet, Facebook, Inc.
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)
15extern "C" {
16#endif
17
18
19/*-****************************************
20*  Dependencies
21******************************************/
22#include <time.h>         /* clock_t, clock, CLOCKS_PER_SEC */
23
24
25
26/*-****************************************
27*  Local Types
28******************************************/
29
30#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
31# if defined(_AIX)
32#  include <inttypes.h>
33# else
34#  include <stdint.h> /* intptr_t */
35# endif
36  typedef uint64_t           PTime;  /* Precise Time */
37#else
38  typedef unsigned long long PTime;  /* does not support compilers without long long support */
39#endif
40
41
42
43/*-****************************************
44*  Time functions
45******************************************/
46#if defined(_WIN32)   /* Windows */
47
48    #include <windows.h>   /* LARGE_INTEGER */
49    typedef LARGE_INTEGER UTIL_time_t;
50    #define UTIL_TIME_INITIALIZER { { 0, 0 } }
51
52#elif defined(__APPLE__) && defined(__MACH__)
53
54    #include <mach/mach_time.h>
55    typedef PTime UTIL_time_t;
56    #define UTIL_TIME_INITIALIZER 0
57
58/* C11 requires timespec_get, but FreeBSD 11 lacks it, while still claiming C11 compliance.
59   Android also lacks it but does define TIME_UTC. */
60#elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
61    && defined(TIME_UTC) && !defined(__ANDROID__)
62
63    typedef struct timespec UTIL_time_t;
64    #define UTIL_TIME_INITIALIZER { 0, 0 }
65
66#else   /* relies on standard C90 (note : clock_t measurements can be wrong when using multi-threading) */
67
68    typedef clock_t UTIL_time_t;
69    #define UTIL_TIME_INITIALIZER 0
70
71#endif
72
73
74UTIL_time_t UTIL_getTime(void);
75PTime UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd);
76PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd);
77
78#define SEC_TO_MICRO ((PTime)1000000)
79PTime UTIL_clockSpanMicro(UTIL_time_t clockStart);
80PTime UTIL_clockSpanNano(UTIL_time_t clockStart);
81
82void UTIL_waitForNextTick(void);
83
84
85#if defined (__cplusplus)
86}
87#endif
88
89#endif /* TIME_FN_H_MODULE_287987 */
90