1  /* High precision, low overhead timing functions.  Generic version.
       2     Copyright (C) 1998-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library 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 GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _HP_TIMING_H
      20  #define _HP_TIMING_H	1
      21  
      22  #include <time.h>
      23  #include <stdint.h>
      24  #include <hp-timing-common.h>
      25  
      26  /* It should not be used for ld.so.  */
      27  #define HP_TIMING_INLINE	(0)
      28  
      29  typedef uint64_t hp_timing_t;
      30  
      31  /* The clock_gettime (CLOCK_MONOTONIC) has unspecified starting time,
      32     nano-second accuracy, and for some architectues is implemented as
      33     vDSO symbol.  */
      34  #ifdef _ISOMAC
      35  # define HP_TIMING_NOW(var) \
      36  ({								\
      37    struct timespec tv;						\
      38    clock_gettime (CLOCK_MONOTONIC, &tv);				\
      39    (var) = (tv.tv_nsec + UINT64_C(1000000000) * tv.tv_sec);	\
      40  })
      41  #else
      42  # define HP_TIMING_NOW(var) \
      43  ({								\
      44    struct __timespec64 tv;						\
      45    __clock_gettime64 (CLOCK_MONOTONIC, &tv);			\
      46    (var) = (tv.tv_nsec + UINT64_C(1000000000) * tv.tv_sec);	\
      47  })
      48  #endif
      49  
      50  #endif	/* hp-timing.h */