ARM VERSION 1.2 Datový list stáhnout pdf (Strana 176)

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101

The C and C++ Libraries

4.11.1 clock()

This is the standard C library clock function from

time.h

Syntax

clock_tclock(void)

Implementation

If the units of

clock_t()

differ from the default of centiseconds you must define

__CLK_TCK

on the compiler command line or in your own header file. The value in the

definition is used for

CLK_TCK

and

CLOCKS_PER_SEC

(the default value is 100 for

centiseconds). If you re-implement

clock()

you must also re-implement

_clock_init()

Returns

The returned value is an unsigned integer.

4.11.2 _clock_init()

This is an optional initialization function for

clock()

Syntax

__weak void _clock_init(void)

Implementation

You must provide a clock initialization function if

clock()

mustwork with a read-only

timer. If implemented,

_clock_init()

is called from the library initialization code.

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