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Arrayblockingqueue, we can also control whether an object's internal lock is a fair lock, and an unfair lock is used by default.2. LinkedblockingqueueA linked list-based blocking queue, similar to Arraylistblockingqueue, maintains a data buffer queue (which is made up of a list of lists), and when the producer puts a data into the queue, the queue fetches the data from the producer and caches it inside the queue. The producer returns immediately; the

developers the freedom to define how locks are acquired and how locks are freed. Sync is the internal abstraction class of Reentrantlock, which implements a simple acquisition lock and a release lock. Nonfairsync and Fairsync respectively represent "unjust locks" and "fair locks", both of which inherit from sync and are all internal classes of reentrantlock. Reentrantlock implements the Lock-unlock method of the lock interface and determines whether

Linux supports three process scheduling strategies, namely Sched_fifo, SCHED_RR, and Sched_normal. Linux supports two types of processes, real-time processes, and common processes. The real-time process can adopt the SCHED_FIFO and SCHED_RR scheduling strategy, and the common process adopts the Sched_normal scheduling strategy. This paper mainly discusses the scheduling algorithm of ordinary process, in order to describe conveniently, "process" in later chapters refers to "ordinary process". Fro

class, not too high speed, in case of large attachments to occupy a large amount of bandwidth, such as SMTP.TC class Add dev $DEV parent 1:2 classid 1:22 HTB rate 30kbit ceil ${uplink-160}kbit prio 51.2.3 in sub-dry category to establish a third leaf class, not too high bandwidth, in case of a large number of data blocking network, such as: Ftp-data.TC class Add dev $DEV parent 1:2 classid 1:23 HTB rate 15kbit ceil ${uplink-170}kbit prio 61.2.4 The fourth leaf category under sub-dry category. N

errors can occur.In addition, Reentrantreadwritelock also has the following features: Fair sex Unfair Lock (default) This is the same as the non-fairness of the exclusive lock, because there is no lock contention between the read threads, so there is no fairness or unfairness in the read operation, and one or more read operations or writes are deferred because the write operation may acquire the lock immediately. Therefore, the throug

scheduling algorithm to improve the scheduling performance of the interactive program, the most famous of which is the "inverse stair deadline scheduling algorithm, which absorbs the queue theory and introduces the concept of fair dispatch to the Linux scheduler." And finally replaced the O (1) scheduling algorithm in the 2.6.23 kernel version, which is now called the "complete Fair scheduling algorithm",

programs that require user interaction, and because of this, the O (1) scheduler, while ideal for large server workloads, is poorly performing on desktop systems where many interactive programs are running because of the lack of interactive processes, Since the beginning of the 2.6 kernel system development, the developer introduced a new process scheduling algorithm to improve the scheduling performance of the interactive program, the most famous of which is the "inverse stair deadline schedul

of mutual exclusion lock will lead to the lock between the threads of competition. If you can read it, you will be able to lock it once you write it. Such a change is a good solution to this problem, so that the read operation can improve the performance of reading, and will not affect the operation of the write. A resource can be accessed by multiple readers or accessed by a writer, both of which cannot be performed concurrently. This is an abstract interface for reading and writing locks, d

unique to each thread, there is no concurrency error at all. Fair lock Multiple threads are allocated according to the order in which they are requested for a lock, synchronized is not a fair lock Spin lock When two or more than two threads execute in parallel, we can let the next thread wait a little bit, but do not discard the processor execution time, see if the t

About Java lock on the bottom of the implementation of the principle of a bit deep, reprinted learning. Lock is written entirely in Java, which is irrelevant to the JVM implementation at this level of Java. There are many implementation classes of lock in the Java.util.concurrent.locks package, commonly used in Reentrantlock, Readwritelock (Implementation class Reentrantreadwritelock), Its realization all relies on Java.util.concurrent.AbstractQueuedSynchronizer class, realizes the idea to be si

engines are constantly tending to humanization, more in the consideration of users. One is the core values of search engines, that is fair and just open and transparent. Many people may think that Baidu has too much human intervention, and even many people are very confused, the human right to drop or even seal the station, leaving the user with an unfair and transparent impression. Baidu is not so fair, a

In this section we take a look at the blocking queue (Blockingqueue), where the Blockingqueue interface defines a blocking FIFO queue in which each blockingqueue has a capacity Adding data to the blockingqueue when the capacity is full will block, and the fetch element operation blocks when the capacity is empty. First, let's look at Arrayblockingqueue and Linkedblockingqueue. Arrayblockingqueue Arrayblockingqueue is a bounded blocking queue implemented with arrays. This queue sorts the elements