It is defined in sys time h header file and takes two arguments the first arugment is reference to the timeval structure and the second argument is a null pointer.
Wall clock time in c.
In other words it is the difference between the time at which a task finishes and the time at which the task started.
To calculate time taken by a process we can use clock function which is available time h we can call the clock function at the beginning and end of the code for which we measure time subtract the values and then divide by clocks per sec the number of clock ticks per second to get processor time like following.
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The clock function tells how much wall clock time has passed since the crt initialization during process start.
Gettimeofday the gettimeofday function returns the wall clock time elapsed since the epoch and store it in the timeval structure expressed as seconds and microseconds.
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Include time h clock t start end.
Great visual learning clock time resource.
Look at the wall clock when the activity starts look again when the activity ends compute the difference between the two times.
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Note that this function does not strictly conform to iso c which specifies net cpu time as the return value.
For example if the cpu is shared by other processes std clock time may advance slower than wall clock.
Wall clock time from the system wide realtime clock class steady clock c 11 monotonic clock that will never be adjusted class high resolution clock c 11 the clock with the shortest tick period available class is clock is clock v c 20 determines if a type is a clock class.
To obtain cpu times use the win32 getprocesstimes function.
The term wall clock time refers to the elapsed time that an activity takes and alludes to the method of timing such an activity.
Elapsed real time real time wall clock time or wall time is the actual time taken from the start of a computer program to the end.
Wall time is thus different from cpu time which measures only the time during which the processor is actively working on a certain task.