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We often face the issue of dividing a group of users with rare resources. They all have equal rights to obtain resources, but some users actually only need less resources than other users. how can we allocate resources? A sharing technology widely used in practice is called "maximum, minimum, and fair sharing ". intuitively, fair share is allocated to each user to meet the minimum requirements, and then eve

Appearance expert: Wang dazheng, an industry expert from Phillips and other foreign companies, Guo Song from China Youth Development Service Center and Beijing Youth Vocational Skills Training Center, zhou wenxia, a professor at the People's University of China's Labor and Personnel College, Lu Lin, director of the Beijing Graduate Employment Service Center, Qi yunzhi, Employment Recommendation Department, Beijing University Graduate Employment Guidance Center, Li guozhong, CHEN Ji and his teach

for A lock again. However, this will cause A deadlock because thread A already holds the lock for this object and is applying to obtain the lock for this object, in this way, thread A waits for the lock that will never be obtained. Because both synchronized and Lock are reentrant, the above phenomenon will not occur. 2. locks that can be interrupted As the name suggests, an interruption lock is a lock that can respond to an interruption. In Java, synchronized is not an interruption Lock, but a

How does the Nginx load balancer do it? In fact, nginx load balancing has a lot of methods can be achieved, the following I will give you a concrete introduction of the Nginx load balancing algorithm, including polling, Weight,ip_hash,fair and Url_hash five algorithms. One, Nginx load balancing algorithm 1. Polling (default) Each request is assigned to a different backend service in chronological order, and if a server in the back end freezes, the fa

node in the queue.Aqs's design is based on the template method pattern, which allows the user to implement different functions of the lock by inheriting the Aqs class and overriding the specified method. The overriding methods are:Second, the use of learning Aqs through Reentrantlock1, the acquisition of fair Lock/*** Sync object for fair locks*/Static Final classFairsyncextendsSync {Private Static Final L

Original: https://www.cnblogs.com/549294286/p/3935408.htmlWe often face the problem of dividing scarce resources into a group of users, who have equal rights to acquire resources, but some of them actually need less resources than others. So how do we allocate resources? A widely used sharing technology in practice is called "Maximum minimum fair sharing". Intuitively, Fair share the minimum requirements th

Tag: Strong indicates that the name BSP Rsync color request could not be1. Can be re-entered lockBoth Reentrantlock and synchronized are reentrant locks. 1 class main{ 2 Public synchronized void Method1 () { 3 Metho D2 (); 4 } 5 6 public synchronized void Method2 () { 7 8 }9 } Another synchronized method Method2 is called in Method1, at which point the thread does not have to reapply for the lock, but can execute the method method2 directly. If it is not reentrant, it can c

Reprint Please specify source: http://www.cnblogs.com/skywang12345/p/3496101.htmlReentrantlock IntroductionReentrantlock is a reentrant mutex, also known as an "exclusive lock."As the name implies, Reentrantlock locks can only be held by a single thread lock at the same point in time, whereas reentrant means that reentrantlock locks can be obtained multiple times by individual threads.Reentrantlock is divided into " fair lock " and " non-

by a single thread or multiple threads, the lock is divided into exclusive locks and shared locks. Exclusive locks guarantee that only one thread can read and write permissions at any time, and Reentrantlock is a mutex that is exclusively implemented. Shared locks can have multiple read threads at the same time, but there can be only one write thread, read and write are mutually exclusive, such as Readwritelock read-write locks, which allow a resource to be read simultaneously by multiple threa

aqs in the function of exclusive control and shared control two functions can beIn the Aqs class, there is a member variable called State, and in Reentranlock he indicates the number of threads acquiring the lock, if state=0, indicates that there is no ready-made lock, 1 indicates that a lock has been acquired, and that greater than 1 indicates the number of reentrant Reentranlock's source code First of all we have a general understanding of Reentranlock, Reentranlock is divided into

The constructors for the Reentrantlock and Reentrantreadwritelock classes contain a Boolean parameter, fair, which allows you to control the behavior of these two classes. The default Fair value is False, which is referred to as the non-fair pattern (Non-fair mode). In unfair mode, when there are many threads waiting f

likeLockIs synchronized In summary,LockThe framework includeswaitAndnotifyIs calledCondition).LockThe object acts as the factory object bound to the condition variable bound to this lock, with the standardwaitAndnotifyDifferent methods, for the specifiedLock, There can be more than one conditional variable associated with it. This simplifies the development of many concurrent algorithms. For example,Condition)Javadoc of shows an example of bounded buffer implementation. This example uses two co

HDU-3695 computer Virus on Planet PandoraTest instructions: computer virus, now n-clock virus command, then there is a computer instruction, look at this computer instructions in a few viruses, if the computer planted a virus, then there is a substring is a virus instruction, or the substring of the crossdress is a virus directive, now ask the computer command total infected with how many viruses.The following: AC automata, then forward matching again, reverse match again.Code:1#include 2 using

buffer implementation that uses two condition variables, "not full" and "not empty", which is more readable (and more efficient) than the implementation of each lock with only one wait setting. Conditionmethods are wait notify notifyAll similar to, and methods, named await , and, respectively, signal signalAll because they cannot overwrite Object the corresponding method. It's not fair .If you look at Javadoc, you'll see that ReentrantLock a pa

can use are limited by the resources owned by the queue, and can be configured soft limits or optional hard limits To restrict the resources that are owned by the queue.(2) Hierarchical queue hierarchical queues support the prioritization of shared resources in an organization's own queues, providing more control and forecasting capabilities.2. the difference between Fair Scheduler and capacity SchedulerA. Fair