Question

I need to measure the cpu usage of individual threads on darwin. On linux I use getrusage(RUSAGE_THREAD, …) but it’s not available on darwin.

Answer 1

RUSAGE_THREAD flag of getrusage is Linux-specific.

getrusage of xnu does output only per-process sum.

Information about usage times of each thread is maintained in task_basic_info struct of each thread.

Documentation is here http://www.gnu.org/software/hurd/gnumach-doc/Task-Information.html

Here is a simple example of how to get task_basic_info struct
http://blog.kuriositaet.de/?p=257

 task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count)