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timing: added new function to compare timestamps

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This commit is contained in:
Steffen Vogel 2018-10-20 15:36:27 +02:00
parent ed27d25823
commit 83ca82204c
2 changed files with 11 additions and 0 deletions
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3
include/villas/timing.h
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@ -32,6 +32,9 @@
extern "C" {
#endif
/** Compare two timestamps. Return zero if they are equal */
ssize_t time_cmp(const struct timespec *a, const struct timespec *b);
/** Get delta between two timespec structs */
struct timespec time_diff(const struct timespec *start, const struct timespec *end);

8
lib/timing.c
View file

@ -48,6 +48,14 @@ struct timespec time_add(const struct timespec *start, const struct timespec *en
return sum;
}
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;
}
struct timespec time_diff(const struct timespec *start, const struct timespec *end)
{
struct timespec diff = {