/* Time related functions. * * Author: Steffen Vogel * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University * SPDX-License-Identifier: Apache-2.0 */ #include #include struct timespec time_now() { struct timespec ts; clock_gettime(CLOCK_REALTIME, &ts); return ts; } struct timespec time_add(const struct timespec *start, const struct timespec *end) { struct timespec sum = {.tv_sec = end->tv_sec + start->tv_sec, .tv_nsec = end->tv_nsec + start->tv_nsec}; if (sum.tv_nsec >= 1000000000) { sum.tv_sec += 1; sum.tv_nsec -= 1000000000; } return sum; } struct timespec time_diff(const struct timespec *start, const struct timespec *end) { struct timespec diff = {.tv_sec = end->tv_sec - start->tv_sec, .tv_nsec = end->tv_nsec - start->tv_nsec}; if (diff.tv_nsec < 0) { diff.tv_sec -= 1; diff.tv_nsec += 1000000000; } return diff; } struct timespec time_from_double(double secs) { struct timespec ts; ts.tv_sec = secs; ts.tv_nsec = 1.0e9 * (secs - ts.tv_sec); return ts; } double time_to_double(const struct timespec *ts) { return ts->tv_sec + ts->tv_nsec * 1e-9; } double time_delta(const struct timespec *start, const struct timespec *end) { struct timespec diff = time_diff(start, end); return time_to_double(&diff); } ssize_t time_cmp(const struct timespec *a, const struct timespec *b) { ssize_t sd = a->tv_sec - b->tv_sec; ssize_t nsd = a->tv_nsec - b->tv_nsec; return sd != 0 ? sd : nsd; }