Are threads in the application server preemptive?

Question

Are threads in the application server preemptive or non-preemptive? That is do
they automatically yield to other threads running in the application server after
they have run for a certain amount of time or do they only yield when certian
points in the code are reached (eg when they have completed, when they reach a
remote call or when they explictly call yield()).

Answer 1

Green threads (way back in 1.1.8 and so on) was Unix only, and non-preemptive.
It was also very lumpy and unreliable. Old threading tutorials used to recommend
calling yield() and suitable points in your code - just like Windows 3.0 all over
again.
But all current JVM implementations use OS threading, and are pre-emptive (but
of course that doesn't stop them being blocked due to synchronization or I/O etc...)
simon.
Rob Woollen <[email protected]> wrote:
It would depend on the underlying JVM or OS. However I've not aware
of any Java
implementations that are non-preemptive.
-- Rob
Ash Beitz wrote:
Are threads in the application server preemptive or non-preemptive?That is do
they automatically yield to other threads running in the applicationserver after
they have run for a certain amount of time or do they only yield whencertian
points in the code are reached (eg when they have completed, when theyreach a
remote call or when they explictly call yield()).