thread_policy_set: how to raise thread priority to max?

Subject: thread_policy_set: how to raise thread priority to max?
From: Peter Stys <email@hidden>
Date: Mon, 28 Apr 2008 20:20:58 -0600

Hi Folks:

I hope this is the appropriate list to ask this question: I need real-time performance for my app for a limited (up to several seconds) period of time. After digging around, thread_policy_set seemed like the solution but I can't get it to work in my Xcode project (I'm running Leopard):

1) the example snippet @ http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming/scheduler/chapter_8_section_4.html doesn't work; #include <mach/sched.h> does not exist, I figured out it should be just <sched.h>

2) then I find that:

kern_return_t thread_policy_set(

thread_t thread,

thread_policy_flavor_t flavor,

thread_policy_t policy_info,

mach_msg_type_number_t count);

kern_return_t thread_policy_get(

thread_t thread,

thread_policy_flavor_t flavor,

thread_policy_t policy_info,

mach_msg_type_number_t *count,

boolean_t *get_default);

is commented out in thread_policy.h. Why?

3) so I added these declares manually in my code, then the linker fails complaining that the thread_policy_set symbol is undefined. I did add libSystem.dylib to the Xcode project (which is where the binaries for this fn live ?)

So how does one invoke thread_policy_set is one's Xcode project, and is this the best way to reserve as many CPU cycles as possible for one's thread?

Many thanks,

Peter.

---------------------------------------------

Peter K. Stys, MD

Professor, Dept. of Clinical Neurosciences

Hotchkiss Brain Institute

University of Calgary

tel (403) 210-8646

email@hidden

---------------------------------------------

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