Re: Pthread Priority
Re: Pthread Priority
- Subject: Re: Pthread Priority
- From: Romain Marucchi <email@hidden>
- Date: Wed, 20 Aug 2008 20:06:25 +0800
Allright got it tks to you and Luca.
And btw I take your advice Luca and switch for SCHED_RR.
Cheers guys,
ps: The first statement wasn't a question but a typo ;)
On Aug 20, 2008, at 7:15 PM, Ken Thomases wrote:
On Aug 20, 2008, at 3:01 AM, Romain Marucchi wrote:
Im porting a Linux app to the Mac and have the following code to
set my thread priority?
Is that a question? ;)
The results are not as expected Im I missing something?
What were you expecting? How did the results differ?
...
...
struct sched_param param;
int policy = SCHED_OTHER;
SCHED_OTHER is non-portable.
priority = VERY_HIGH;
param.sched_priority = priority;
pthread_setschedparam( pthread_self(), policy, ¶m );
Have you considered checking the return code?
...
...
And I got the following def. for my priorities:
VERY_LOW = 10,
LOW = 5,
NORMAL = 0,
HIGH = -5,
HIGH = -10
One of the things that makes SCHED_OTHER non-portable is that some
platforms use low numbers for low priority and high number for high
priority, while others map in the reverse order. Also, the minimums
and maximums can differ. So, these values are not portable, either.
Use the functions sched_get_priority_min(SCHED_OTHER) and
sched_get_priority_max(SCHED_OTHER) to figure out what values to use.
I suggest you have a look here:
http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming/scheduler/chapter_8_section_1.html
Cheers,
Ken
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