The idea is to order the elements in a FIFO (first-in-first-out) manner. Adding an item to the queue is technically called the process of enqueue, and the item removed from the queue is from the first in the line. People get added to the end of the queue or from the tail end. The first person standing in the queue gets the first chance to get the ticket and the last person gets one’s chance at the end. The idea is quite similar to a number of people standing in a queue for say, getting a ticket. A queue is basically a data structure that defines specific norms to the process of insertion and retrieval of items from a store. The PriorityQueue class is a part of the java.util package and is a generic implementation of a priority-based queue in Java. This article gets into some intricate information about this API and its use with appropriate code examples. Threads in BG groups gets roughly 5% of CPU time.The PriorityQueue is one of the important Java APIs built on the unbounded priority queue and priority heap. Threads in FG group gets more CPU time than threads in BG group. The threads in different control groups gets different amounts of execution on processor. The thread control groups(cgroups) are Linux container that are used to manage the allocation of processor time for all threads in one containerĪndroid defines multiple control groups, but the most important ones for applications are Foreground and Background Group. Threads with a higher nice value (i.e., lower priority, as in they are being “nice” to other threads in the system) will run less often than those with lower nice values Cgroups
Nice values in Android are used as a measure of a thread’s priority. This algorithm schedules threads based on their priority relative to other runnable threads.Īndroid’s thread scheduler uses two main factors to determine how threads are scheduled across the entire system: nice values and cgroups.
The Java runtime supports a very simple, deterministic scheduling algorithm known as fixed priority scheduling. Lets start with basic understanding of how scheduling works in Android or Java runtime.
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