bson_get_monotonic_time man page

int64_t
bson_get_monotonic_time (void);
int
bson_gettimeofday (struct timeval *tv,
                   struct timezone *tz);

The clock abstraction in Libbson provides a cross-platform way to handle timeouts within the BSON library. It abstracts the differences in implementations of gettimeofday() as well as providing a monotonic (incrementing only) clock in microseconds.

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