3 ms·

> XPC sync is not in fact async underneath That's interesting! I thought XPC was a wrapper around async mach messages. Do you have any pointers where I can lea

• astrange 5y ago
  When you get to kernel land it is "something async plus a wait"; there's no other way for it to be when the remote task is on a different core. But it's a special wait that the scheduler and other systems know how to benefit from using vouchers/turnstiles/etc. If you look at spindump output you should see it.