/**************************************************************************** ** ** This file is part of GAP, a system for computational discrete algebra. ** ** Copyright of GAP belongs to its developers, whose names are too numerous ** to list here. Please refer to the COPYRIGHT file for details. ** ** SPDX-License-Identifier: GPL-2.0-or-later **
*/
#ifndef GAP_GAPTIME_H #define GAP_GAPTIME_H
#include"common.h"
/**************************************************************************** ** *F SyTime() . . . . . . . . . . . . . . . return time spent in milliseconds ** ** 'SyTime' returns the number of milliseconds spent by GAP so far. ** ** Should be as accurate as possible, because it is used for profiling.
*/
UInt SyTime(void);
/**************************************************************************** ** *F SyNanosecondsSinceEpoch() ** ** 'SyNanosecondsSinceEpoch' returns a 64-bit integer which represents the ** number of nanoseconds since some unspecified starting point. This means ** that the number returned by this function is not in itself meaningful, ** but the difference between the values returned by two consecutive calls ** can be used to measure wallclock time. ** ** The accuracy of this is system dependent. For systems that implement ** clock_getres, we could get the promised accuracy. ** ** Note that gettimeofday has been marked obsolete in the POSIX standard. ** We are using it because it is implemented in most systems still. ** ** If we are using gettimeofday we cannot guarantee the values that ** are returned by SyNanosecondsSinceEpoch to be monotonic. ** ** Returns -1 to represent failure.
*/
Int8 SyNanosecondsSinceEpoch(void);
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