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Red Hat Enterprise Linux 6 Essentials eBook now available in PDF and ePub formats for only $9.99
RHEL 6 Essentials contains 40 chapters and over 250 pages.

Chapter 4. Timestamp Functions

function::get_cycles — Processor cycle count.
function::gettimeofday_ns — Number of nanoseconds since UNIX epoch.
function::gettimeofday_us — Number of microseconds since UNIX epoch.
function::gettimeofday_ms — Number of milliseconds since UNIX epoch.
function::gettimeofday_s — Number of seconds since UNIX epoch.
Each timestamp function returns a value to indicate when a function is executed. These returned values can then be used to indicate when an event occurred, provide an ordering for events, or compute the amount of time elapsed between two time stamps.

Name

function::get_cycles — Processor cycle count.

Synopsis

function get_cycles:long()

Arguments

None

General Syntax

get_cycles:long

Description

This function returns the processor cycle counter value if available, else it returns zero. The cycle counter is free running and unsynchronized on each processor. Thus, the order of events cannot determined by comparing the results of the get_cycles function on different processors.

Name

function::gettimeofday_ns — Number of nanoseconds since UNIX epoch.

Synopsis

function gettimeofday_ns:long()

Arguments

None

General Syntax

gettimeofday_ns:long

Description

This function returns the number of nanoseconds since the UNIX epoch.

Name

function::gettimeofday_us — Number of microseconds since UNIX epoch.

Synopsis

function gettimeofday_us:long()

Arguments

None

General Syntax

gettimeofday_us:long

Description

This function returns the number of microseconds since the UNIX epoch.

Name

function::gettimeofday_ms — Number of milliseconds since UNIX epoch.

Synopsis

function gettimeofday_ms:long()

Arguments

None

General Syntax

gettimeofday_ms:long

Description

This function returns the number of milliseconds since the UNIX epoch.

Name

function::gettimeofday_s — Number of seconds since UNIX epoch.

Synopsis

function gettimeofday_s:long()

Arguments

None

General Syntax

gettimeofday_s:long

Description

This function returns the number of seconds since the UNIX epoch.

 
 
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