lib/gethrxtime.h

   1 /* gethrxtime -- get high resolution real time
   2
   3    Copyright (C) 2005, 2009-2018 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #ifndef GETHRXTIME_H_
  21 #define GETHRXTIME_H_ 1
  22
  23 #include "xtime.h"
  24
  25 #ifndef _GL_INLINE_HEADER_BEGIN
  26  #error "Please include config.h first."
  27 #endif
  28 _GL_INLINE_HEADER_BEGIN
  29 #ifndef GETHRXTIME_INLINE
  30 # define GETHRXTIME_INLINE _GL_INLINE
  31 #endif
  32
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /* Get the current time, as a count of the number of nanoseconds since
  38    an arbitrary epoch (e.g., the system boot time).  Prefer a
  39    high-resolution clock that is not subject to resetting or
  40    drifting.  */
  41
  42 #if HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME
  43 # include <time.h>
  44 GETHRXTIME_INLINE xtime_t gethrxtime (void) { return gethrtime (); }
  45 # else
  46 xtime_t gethrxtime (void);
  47 #endif
  48
  49 _GL_INLINE_HEADER_END
  50
  51 #ifdef  __cplusplus
  52 }
  53 #endif
  54
  55 #endif