/** Time related functions. * * @file * @author Steffen Vogel * @copyright 2017, Institute for Automation of Complex Power Systems, EONERC * @license GNU General Public License (version 3) * * VILLASnode * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . *********************************************************************************/ #pragma once #include #include #include #include /** Create a new timer with the given rate. */ int timerfd_create_rate(double rate); /** Wait until timer elapsed * * @param fd A file descriptor which was created by timerfd_create(3). * @retval 0 An error occured. Maybe the timer was stopped. * @retval >0 The nummer of runs this timer already fired. */ uint64_t timerfd_wait(int fd); /** Wait until a fixed time in the future is reached * * @param fd A file descriptor which was created by timerfd_create(3). * @param until A pointer to a time in the future. * @retval 0 An error occured. Maybe the timer was stopped. * @retval >0 The nummer of runs this timer already fired. */ uint64_t timerfd_wait_until(int fd, const struct timespec *until); /** Get delta between two timespec structs */ struct timespec time_diff(const struct timespec *start, const struct timespec *end); /** Get sum of two timespec structs */ struct timespec time_add(const struct timespec *start, const struct timespec *end); /** Return current time as a struct timespec. */ struct timespec time_now(); /** Return the diffrence off two timestamps as double value in seconds. */ double time_delta(const struct timespec *start, const struct timespec *end); /** Convert timespec to double value representing seconds */ double time_to_double(const struct timespec *ts); /** Convert double containing seconds after 1970 to timespec. */ struct timespec time_from_double(double secs);