Learning materials from http://ifeve.com/java-concurrency-thread-directory/One, multi-threaded
the difference between a process and a thread: A program runs at least one process, and a process contains at least one thread.
Multithreading: Multithreading enables multiple threads to execute in parallel within a program, and a thread's execution can be thought of as a CPU executing the program, wh
Introduction: Active object is a typical design pattern in concurrent programming practice, and the core of active object mode is to improve the concurrency of programs by solving the invocation and execution of the coupling method. This paper begins with the typical active object design pattern and explores the application of the active object concurrency patter
, List page and detail page anti-brush, seconds kill operation Anti-brush, verification code anti-brush. This chapter introduces some common schemes to prevent spiders or second-kill artifacts.8th Server Optimization (TOMCAT/NGNIX/LVS) tomcat optimization, Ngnix optimization, LVS four-layer load balancing, lvs+keepalived high-availability optimizationThe 9th chapter of the course summary and the heavy difficulties reviewA review of the curriculum summary and difficulties : Baidu Network disk dow
inherit the class to create our own timed task and use the timer to schedule its execution.What is the difference between a synchronous collection in 14,java and a concurrent collection?Both synchronous and concurrent collections provide the appropriate thread-safe collection for multithreading and concurrency, although the concurrency collection is more extensi
[Java concurrent programming] 9: deadlock (including code), java concurrency
A deadlock may occur when the thread needs to hold multiple locks at the same time. Consider the following situations:
Thread A currently holds the lock1 lock and thread B currently holds the lock2 lock. Next, when thread A still holds lock1, it tries to get lock2 because thread B is hol
);V.stopit ();Thread.Sleep (2000);SYSTEM.OUT.PRINTLN ("Finish main");System.out.println (V.getstop ());}Iv. Rules of Happen-beforeProcedural Order Principle: the serialization of semantics within a threadVolatile rules: The write of volatile variables, which occurs first in the read, which guarantees the visibility of volatile variablesLock rule: Unlocking (unlock) must occur before the subsequent locking (lock)Transitivity: A precedes b,b before C, then a must precede CThe start () method of th
recycling of objects in multi-threaded environments is very difficult, the Java Runtime Environment of garbage collection (garbage COLLECTION,GC) function to alleviate the burden of programmers.ReferenceJava 1.6 Apidocs thread,http://tool.oschina.net/uploads/apidocs/jdk-zh/java/lang/thread.htmlJava Concurrency in practice
obtained when a synchronization method on another object is accessed in a synchronous method.4, for synchronization, to be awake at all times on which object synchronization, this is the key.5, write thread-safe classes, you need to pay attention to multiple threads competing access to the logic and security of the resources to make the right judgment, the "atomic" operation to make an analysis, and ensure that other threads during atomic operation can not access the competing resources.6. When
The concept of first contact deadlock is the "Philosopher's meal" as described in the principle of operating system in a university course. In the operating system, a deadlock problem may occur because each process shares system resources. In the same Java multithreaded environment, there are also deadlock problems caused by resource sharing. When a set of Java threads Deadlock, it is possible that the prog
Java concurrency series [6] ---- Semaphore source code analysis, java ---- semaphore
Semaphore is a common class in the JUC package. It is an application in the AQS sharing mode and allows multiple threads to operate on shared resources at the same time, in addition, it can effectively control the number of concurrent jobs and use it to control traffic. Semaphore
() method, and if the non-blocking thread simply changes the interrupt state, the thread will continue to run down, but if it is in a unblocking thread, such as the execution of sleep (), wait (), join () The thread that waits for the method throws the interruptedexception exception because the interrupt state is set, and the program handles this exception capture.The three main points mentioned above, the first is the implementation of polling at which level, there is no special requirement, i
and concurrency issues are among the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp of the basics of Java multithreading to match the problems you encounter later.1. Java Mu
The Java memory model is the foundation for multi-threaded security, but the understanding of the cognitive type is not studied in depth.First, what is the memory model, why it needs its Java memory model (Java storage models) concurrency-related security announcements, synchronization policy specification, consistency
() {Clear Business Full.notifyall ();}Think of more targeted object-oriented programming. Similar issues with databases: Dirty reads: The first thing reads the data that the second thing is updating, and if the UPDATE statement is not yet complete, the first thing reads only the data in a process, not the actual result. Oracle's Things by default: Read Committed (commit read), the problem does not occurExclusive Lock: Gets an exclusive lock when the data is changed.Shared Lock: The query acqui
Java Open source Fresh e-commerce platform discussion and solution of concurrency problem and lock mechanism in-oms Order system (source code can be downloaded)Description: Discussion and solution of concurrency problem and lock mechanism in OMS order system of Java Open Source fresh e-commerce:Origin of the problemSup
! bells >> ");}} /** * Termination * @author Lenovo * */class Terminate implements runnable{@Overridepublic void Run () {System.out.println ("Terminate Scheduler.shutdown ();//must start a separate task to does this job must start a separate task to do the job//since the scheduler has been ShUT down self-scheduler has closed new Thread () {public void run () {Datapoint d:data) {System.out.println ("Datapoint:" +d);}};}. Start ();}} /** * can hold and display individual data segments * @author Le
Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a
Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a
java multithreading and Concurrency basics interview questions and Answers Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp
Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a
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