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Why Thread Priorities in Java Do Not Guarantee Execution Order
- Java thread priorities are treated as a suggestion rather than a strict rule by the operating system.
- Each thread in Java has a priority value between 1 and 10.
- Setting a thread's priority does not directly control when it will run or enforce a strict execution order.
- The JVM communicates the thread's priority to the operating system, which ultimately decides how to prioritize threads.
- Different operating systems handle thread priorities differently, not always aligning with Java's priority scale.
- Operating systems like Windows translate Java priorities into their own thread-priority constants, impacting thread scheduling.
- Threads can voluntarily yield the CPU through methods like Thread.sleep() or Thread.yield(), affecting their execution order.
- Thread behavior can appear unpredictable due to preemptive multitasking and various factors influencing thread scheduling decisions.
- Relying solely on thread priorities for precise program behavior is risky, and using synchronization mechanisms is more reliable.
- Concurrency design around synchronization tools rather than thread priorities can lead to more predictable program execution.
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