_clock_init()
Defined in rt_misc.h, the _clock_init() function is an initialization function for clock().
It is not part of the C library standard, but the Arm® C library supports it as an extension.
Syntax
void _clock_init(void);
Usage
This is a function that you can re-implement in an implementation-specific way. It is called from the library initialization code, so you do not have to call it from your application code.
Note
You must re-implement this function if you re-implementclock().
The initialization that _clock_init() applies
enables clock() to return the time that has
elapsed since the program was started.
An example of how you might re-implement _clock_init() might
be to set the timer to zero. However, if your implementation of clock() relies
on a system timer that cannot be reset, then _clock_init() could
instead read the time at startup (when called from the library initialization code),
with clock() subsequently subtracting the time
that was read at initialization, from the current value of the timer.
In both cases, some form of initialization is required of _clock_init().