Stephane Eranian <eranian@hpl.hp.com> writes:

> [...]
>> > [...]  AFAIK, there is no single call to stop T1 and wait until it
>> > is completely off the CPU, unless we go through the (internal)
>> > ptrace interface.
>> 
>> The utrace code supports this style of thread manipulation better
>> than ptrace.
>
> Afre you saying that utrace provides a utrace_thread_stop(tid) call
> that returns only when the thread tid is off the CPU. And then there
> is a utrace_thread_resume(tid) call. If that's the case then that is
> what I need.

While I see no single call, it can be synthesized from a sequence of
them: utrace_attach, utrace_set_flags (... UTRACE_ACTION_QUESCE ...),
then waiting for a callback.  Roland, is there a more compact way?

> How are we with regards to utrace integration?

Roland McGrath is working on breaking the patches down.

- FChE