On Thu, 4 Feb 2021 08:26:35 GMT, Mikael Vidstedt <mik...@openjdk.org> wrote:

> You read my mind, Andrew. Unless, of course, it's optimized to leverage the 
> fact that it's thread-specific..

it's thread-specific

https://developer.apple.com/documentation/apple_silicon/porting_just-in-time_compilers_to_apple_silicon

>Because pthread_jit_write_protect_np changes only the current thread’s 
>permissions, avoid accessing the same memory region from multiple threads. 
>Giving multiple threads access to the same memory region opens up a potential 
>attack vector, in which one thread has write access and another has executable 
>access to the same region.

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PR: https://git.openjdk.java.net/jdk/pull/2200

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