ceph/src/zstd/programs/timefn.h

   1 /*
   2  * Copyright (c) 2016-2020, 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)
  15 extern "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 # include <stdint.h>
  32   typedef uint64_t           PTime;  /* Precise Time */
  33 #else
  34   typedef unsigned long long PTime;  /* does not support compilers without long long support */
  35 #endif
  36
  37
  38
  39 /*-****************************************
  40 *  Time functions
  41 ******************************************/
  42 #if defined(_WIN32)   /* Windows */
  43
  44     #include <windows.h>   /* LARGE_INTEGER */
  45     typedef LARGE_INTEGER UTIL_time_t;
  46     #define UTIL_TIME_INITIALIZER { { 0, 0 } }
  47
  48 #elif defined(__APPLE__) && defined(__MACH__)
  49
  50     #include <mach/mach_time.h>
  51     typedef PTime UTIL_time_t;
  52     #define UTIL_TIME_INITIALIZER 0
  53
  54 /* C11 requires timespec_get, but FreeBSD 11 lacks it, while still claiming C11 compliance.
  55    Android also lacks it but does define TIME_UTC. */
  56 #elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \
  57     && defined(TIME_UTC) && !defined(__ANDROID__)
  58
  59     typedef struct timespec UTIL_time_t;
  60     #define UTIL_TIME_INITIALIZER { 0, 0 }
  61
  62 #else   /* relies on standard C90 (note : clock_t measurements can be wrong when using multi-threading) */
  63
  64     typedef clock_t UTIL_time_t;
  65     #define UTIL_TIME_INITIALIZER 0
  66
  67 #endif
  68
  69
  70 UTIL_time_t UTIL_getTime(void);
  71 PTime UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd);
  72 PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd);
  73
  74 #define SEC_TO_MICRO ((PTime)1000000)
  75 PTime UTIL_clockSpanMicro(UTIL_time_t clockStart);
  76 PTime UTIL_clockSpanNano(UTIL_time_t clockStart);
  77
  78 void UTIL_waitForNextTick(void);
  79
  80
  81 #if defined (__cplusplus)
  82 }
  83 #endif
  84
  85 #endif /* TIME_FN_H_MODULE_287987 */