Re: GetTickCount on the mac
Re: GetTickCount on the mac
- Subject: Re: GetTickCount on the mac
- From: Jason Coco <email@hidden>
- Date: Fri, 30 Jan 2009 16:22:22 -0500
On Jan 30, 2009, at 16:01 , Andy Wiese wrote:
On Jan 30, 2009, at 9:05 AM, Jason Coco wrote:
On Jan 30, 2009, at 09:27 , Christopher Khaljah Xu wrote:
Hi there!
I'm a rookie on a mac. I've been trying to port some windows
programs that was written in C/C++ onto the mac.
I need to rewrite a timer that measures CPU ticks between the
start and end of an operation. I wonder if there is something in
the mac api similar as GetTickCount or GetTickCount64 ?
You can use mach_absolute_time() (declared in mach/mach_time.h) for
this purpose. For more information on using this routine, see this
technical qa: http://developer.apple.com/qa/qa2004/qa1398.html
Jason
How does clock(3) compare to mach_absolute_time()?
mach_absolute_time() actually counts the clock cycles and is the
reference timer for everything else. Internally, from the C library,
clock(3) calls getrusage(2) on itself and returns the converted sum of
its system and user time.
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