1 /* High precision, low overhead timing functions. Generic version. 2 Copyright (C) 1998-2022 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 */ 51