lib/gethrxtime.h

   1 /* gethrxtime -- get high resolution real time
   2
   3    Copyright (C) 2005, 2009-2024 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 /* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, HAVE_ARITHMETIC_HRTIME_T,
  24    HAVE_DECL_GETHRTIME.  */
  25 #if !_GL_CONFIG_H_INCLUDED
  26  #error "Please include config.h first."
  27 #endif
  28
  29 #include "xtime.h"
  30
  31 _GL_INLINE_HEADER_BEGIN
  32 #ifndef GETHRXTIME_INLINE
  33 # define GETHRXTIME_INLINE _GL_INLINE
  34 #endif
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 /* Get the current time, as a count of the number of nanoseconds since
  41    an arbitrary epoch (e.g., the system boot time).  Prefer a
  42    high-resolution clock that is not subject to resetting or
  43    drifting.  */
  44
  45 #if HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME
  46 # include <time.h>
  47 GETHRXTIME_INLINE xtime_t gethrxtime (void) { return gethrtime (); }
  48 # else
  49 xtime_t gethrxtime (void);
  50 #endif
  51
  52 _GL_INLINE_HEADER_END
  53
  54 #ifdef  __cplusplus
  55 }
  56 #endif
  57
  58 #endif