[foreign] RFR: 8227125: java/foreign/pthread/Threads.java asserts on debug build

[Nick Gasson]

Hi Maurizio,

> Looks great - one question - in the universal invokers there's no assert
> for whether the thread you get back is indeed a Java thread, whereas the
> assert is there in the upcall handlers. Why?
> 

Do you mean the universal vs direct upcall handler? The existing code in 
universalUpcallHandler_* already had an assert on is_Java_thread() a bit 
later (but JavaThread::current() would have already checked this). So I 
just added it to the direct upcall handler which had no assert before.

Forgot to mention I tested this with jtreg jdk_foreign on x86 and 
AArch64 (fastdebug).


Thanks,
Nick