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11.36 srfi.174 - POSIX timespecs

Module: srfi.174

Note: This srfi is originally intended to be used with SRFI-170 (see srfi.170 - POSIX API), but it turned out this was not enough to support the latter–notably, we need SRFI-19 type argument in the constructor.

Consequently, it is likely that this srfi will be superseded later. We deprecate using this srfi; if you need a portable time representation, SRFI-19 is the best choice at this moment. See srfi.19 - Time data types and procedures, for the details.

Function: timespec secs nsecs

[SRFI-174]{srfi.174} Creates and returns a timespec, whose second part is secs and nanosecond part is nsecs. The second part must be an exact integer; if it is positive, it’s the number of seconds since Epoch (Jan 1, 1970 UTC), and if it’s negative, it’s before the Epoch. The nanosecond part is a nonnegative integer less than 1e9, and represents the fraction of seconds in nanosecond resolution. Note that if the second part is negative, the nanosecond part counts toward past.

This is the same as (make-time time-utc nsecs secs) of SRFI-19. Note the order of arguments.

Function: timespec? obj

[SRFI-174]{srfi.174} Returns #t iff obj is a <time> object. It doesn’t check the type of time.

Function: timespec-seconds ts
Function: timespec-nanosecods ts

[SRFI-174]{srfi.174} Returns second and nanosecond part of the <time> object. Same as time-second and time-nanosecond of SRFI-19 (note that we use plurals in this srfi).

Function: inexact->timespec v

[SRFI-174]{srfi.174} Convert an inexact real number v to a timespec. The integral part of v is the seconds after (when v is positive) or before (when v is negative) the Epoch, and the fractional part is rounded into nanosecond resolution.

Function: timespec->inexact ts

[SRFI-174] Convert a timespec into an inexact real number in seconds. {srfi.174}

Function: timespec=? ts1 ts2

[SRFI-174]{srfi.174} Returns #t iff two timespecs are the same. It is the same as time=? in SRFI-19.

Function: timespec<? ts1 ts2

[SRFI-174]{srfi.174} Returns #t iff a timespec ts1 is strictly before the timespec ts2. It is the same as time<? in SRFI-19.

Function: timespec-hash ts

[SRFI-174]{srfi.174} Compute a hash value of a timespec ts. It is same as passing a <time> object to default-hash, and affected by the current hash salt value (see Hashing).

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