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68 lines
No EOL
2.4 KiB
C
68 lines
No EOL
2.4 KiB
C
/** Time related functions.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <stdio.h>
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#include <stdint.h>
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#include <time.h>
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#include <sys/timerfd.h>
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/** Create a new timer with the given rate. */
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int timerfd_create_rate(double rate);
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/** Wait until timer elapsed
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*
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* @param fd A file descriptor which was created by timerfd_create(3).
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* @retval 0 An error occured. Maybe the timer was stopped.
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* @retval >0 The nummer of runs this timer already fired.
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*/
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uint64_t timerfd_wait(int fd);
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/** Wait until a fixed time in the future is reached
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*
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* @param fd A file descriptor which was created by timerfd_create(3).
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* @param until A pointer to a time in the future.
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* @retval 0 An error occured. Maybe the timer was stopped.
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* @retval >0 The nummer of runs this timer already fired.
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*/
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uint64_t timerfd_wait_until(int fd, const struct timespec *until);
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/** Get delta between two timespec structs */
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struct timespec time_diff(const struct timespec *start, const struct timespec *end);
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/** Get sum of two timespec structs */
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struct timespec time_add(const struct timespec *start, const struct timespec *end);
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/** Return current time as a struct timespec. */
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struct timespec time_now();
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/** Return the diffrence off two timestamps as double value in seconds. */
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double time_delta(const struct timespec *start, const struct timespec *end);
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/** Convert timespec to double value representing seconds */
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double time_to_double(const struct timespec *ts);
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/** Convert double containing seconds after 1970 to timespec. */
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struct timespec time_from_double(double secs); |