Legacy Document

Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference

Chapter 27 - Utilities Reference / Functions

Timestamp Utility Functions /

OTElapsedMicroseconds

Calculates the time elapsed in microseconds since since the time specified by the startTime parameter.

C INTERFACE

UInt32 OTElapsedMicroseconds (OTTimeStamp* startTime)

C++ INTERFACE

None. C++ applications use the C interface to this function.

PARAMETERS

startTime

A reference to a timestamp value returned by the OTGetTimeStamp function; this indicates the start of the elapsed time interval.

function result

The number of microseconds that have elapsed since the timestamp specified by the startTime parameter.

DISCUSSION

Returns the number of microseconds that have elapsed since the OTGetTimeStamp function was called to get the startTime value.

A return value of 0xffff ffff indicates that the value has overflowed 32 bits of microseconds.

Use the OTElapsedMilliseconds function to measure elapsed time in milliseconds.

Use the OTGetClockTimeInSecs function to determine the number of seconds that have elapsed since system boot time.