* About task->used_math and TIF_USEDFPU
@ 2004-12-16 8:06 zhan rongkai
2004-12-16 17:33 ` Jun Sun
0 siblings, 1 reply; 2+ messages in thread
From: zhan rongkai @ 2004-12-16 8:06 UTC (permalink / raw)
To: linux-mips
hi all,
I am a little confused about the task_struct member 'used_math', and
thread_info flag TIF_USEDFPU.
What are their meaning, and what is the difference between them?
thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: About task->used_math and TIF_USEDFPU
2004-12-16 8:06 About task->used_math and TIF_USEDFPU zhan rongkai
@ 2004-12-16 17:33 ` Jun Sun
0 siblings, 0 replies; 2+ messages in thread
From: Jun Sun @ 2004-12-16 17:33 UTC (permalink / raw)
To: zhan rongkai; +Cc: linux-mips
On Thu, Dec 16, 2004 at 04:06:12PM +0800, zhan rongkai wrote:
> hi all,
>
> I am a little confused about the task_struct member 'used_math', and
> thread_info flag TIF_USEDFPU.
>
> What are their meaning, and what is the difference between them?
>
used_math is used to indicate whether a process has ever used FPU since
it is created (which typically is true due to the glibc using FPU at the
beginning of each program).
TIF_USEDFPU indicates whether a _running_ process has used FPU since
it is context-switched on.
Jun
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