Java multithreading – thread priority

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Thread priority is just a hint to OS task scheduler and is dependent on the underlying OS. OS will try to allocate more resources to a high priority thread but it does not guarantee it. So if your program is dependent on thread priorities than you are in-turn binding your program to underlying OS, which is bad.

From Java Concurrency in Practice:

Avoid the temptation to use thread priorities, since they increase
platform dependence and can cause liveness problems. Most concurrent
applications can use the default priority for all threads.

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