Timespec_get
timespec_get is a C standard library function that obtains calendar time for a specified time base and stores it in a struct timespec object.
Modern C
timespec_get is a C standard library function that obtains a calendar time with a struct timespec representation for a specified time base.
- How it is used
- Obtains finer-grained calendar-time readings and brackets code for performance measurements.
- How deep it goes
- Gives the function declaration, explains its time base and representation, and examines measurement bias without detailing its implementation.
- Examples
- Brackets several loops with `timespec_get` calls, then collects elapsed-time statistics from successive readings.
- What you can do after
- Apply it via the C standard library to obtain time readings and assess their measurement overhead.
Modern C, Third Edition
timespec_get is a C standard-library function that obtains the current calendar time and stores it in a timespec object.
- How it is used
- Uses timespec_get for finer-grained calendar time and to bracket code in performance measurements.
- How deep it goes
- Explains its time base and precision, then examines measurement bias through repeated timing experiments; does not establish a universal clock resolution.
- Examples
- Shows clock calls around loops and compares per-iteration costs for loops with and without timespec_get.
- What you can do after
- Practice/perform repeated timings with timespec_get while accounting for the bias introduced by clock calls.
Related concepts
- struct timespecuses · struct timespec is a C structure type representing a time value with integral seconds and a fractional nanosecond component.
- time measurementused by · Time measurement is the determination of the elapsed or processor time associated with program execution.
- instrumentationused by · Instrumentation is the addition or activation of mechanisms in software or systems to observe, measure, or record their behavior during execution.
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