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Get the run locker before you ask if your thread is valid.

Description

Get the run locker before you ask if your thread is valid.

I have occasional crashes coming from SBThread::GetExtendedBacktraceThread. The
symptom is that we got true back from HasThreadScope - so we should have a valid
live thread, but then when we go to use the thread, it is not good anymore and we
crash.
I can't spot any obvious cause for this crash, but in looking for same I noticed
that in the current code we check that the thread is valid, THEN we take the stop
locker. We really should do that in the other order, and ensure that the process
will stay stopped before we check our thread is still good. That's what this patch does.

rdar://problem/47478205

Details

Committed
jinghamApr 8 2019, 6:33 PM
Parents
rL357962: [PowerPC] initialize SchedModel according to platform.
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