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44 lines
1004 B
44 lines
1004 B
4 months ago
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/*
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* Copyright (c) 2011 Cyril Hrubis <chrubis@suse.cz>
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*
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* This file is licensed under the GPL license. For the full content
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* of this license, see the COPYING file at the top level of this
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* source tree.
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*/
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/*
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* Here comes common funcions to correctly compute difference between two
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* struct timespec values.
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*/
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#define NSEC_IN_SEC 1000000000
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#ifndef TIME_T_MAX
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# define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
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#endif
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/*
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* Returns difference between two struct timespec values. If difference is
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* greater that 1 sec, 1 sec is returned.
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*/
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static inline long timespec_nsec_diff(struct timespec *t1, struct timespec *t2)
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{
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time_t sec_diff;
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long nsec_diff;
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if (t2->tv_sec > t1->tv_sec) {
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struct timespec *tmp;
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tmp = t1;
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t1 = t2;
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t2 = tmp;
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}
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sec_diff = t1->tv_sec - t2->tv_sec;
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nsec_diff = t1->tv_nsec - t2->tv_nsec;
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if (sec_diff > 1 || (sec_diff == 1 && nsec_diff >= 0))
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return NSEC_IN_SEC;
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return labs(nsec_diff + NSEC_IN_SEC * sec_diff);
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}
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