As part of the putative JDK 10 this JEP 312: Thread-Local Handshakes was proposed.
I've tried to grasp its description, but I am still not confident that I got the idea properly.
Is it essentially an attempt to reanimate something similar to the deprecated Thread.destroy()?
How could this interface theoretically look like?
After researching JEP: 312 Thread-Local-Handshakes and reading the excellent comments to this question, here is a quick summary.
It is a performance enhancement which cannot be used directly by developers:
A handshake
mechanism is proposed as an optimisation of the Hotspot safepoints
mechanism.
The former allows threads in a safepoint to continue executing immediately after performing a regulatory operation (the handshake callback).
The latter forces all threads to block on a safepoint in order for critical operations to take place (such as YoungGen GC or the STW parts of a Full GC). The threads are released only after the critical operation has completed its execution.
OP Commentators:
JimmyB , Andy Turner , skomisa , Alexander Bollaert
References:
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