concurrent programming book

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The Countdownlatch and Cyclicbarrier of Java concurrent programming

. CYCLICBARRIER:A synchronization aid that allows a set of threads to all wait for each other to reach A common barrier PO Int. The description from Javadoc can be drawn as follows: Countdownlatch: One or more threads, waiting for other threads to complete something before they can execute; Cyclicbarrier: Multiple threads wait for each other until they reach the same synchronization point, and then continue to execute together. For Countdownlatch, the focus is "one thr

Mushroom Cloud Action prequel 17th: Scala concurrent programming combat

actor{var counter = 0Def Act () {while (true) {Receive {Case content:string = println ("Message:" + content)Case Hello (name, content,sender) + = {println ("Helloactor:" + "Name:" + name + "Content:" + content + counter)Counter + = 1Thread.Sleep (3000)Sender! Helloback (name, Content+counter, this)}}}}}Class Hellobackactor (Val helloactor:actor) extends actor{var counter = 0Def Act () {Helloactor! Hello ("Spark", "Love Was Here", this)while (true) {Receive {Case content:string = println ("Messa

The explicit locking principle of concurrent programming

chance to acquire the lock and return the interrupt flag.So, blocking a thread in the dead loop is one of our more common blocking patterns, designed to make it possible to re-compete for associated lock resources after it is awakened.Above, we have completed an introduction to the principle of locking and release lock of Reentrantlock, which is a combination of shared lock and exclusive lock, which is relatively more complex, for the reentrantreadwritelock lock of Read and write separation. We

JAVA concurrent programming 8 _ Use of thread pool, java thread

JAVA concurrent programming 8 _ Use of thread pool, java threadDo not use Thread Pool 1. execute tasks in sequence class SingleThreadWebServer {public static void main(String[] args) {ServerSocket socket = new ServerSocket(80);while (true) {Socket conn = socket.accept();handleRequest(conn);}}} You need to wait for a connection to be processed before processing the next user request. The high throughput an

Java multithreading, concurrent programming knowledge point summary, java Multithreading

Java multithreading, concurrent programming knowledge point summary, java Multithreading 1. thread status 1.1 two ways to create a thread: interface and Thread class. Advantages of Using Interfaces: it better reflects the object-oriented thinking and avoids the limitations caused by Java's single inheritance feature;Enhance the robustness of the program. The code can be shared by multiple threads, and the c

Java Multi-threading, concurrent programming Knowledge Point Summary

call () method can only be executed by Executorservice's submit (callableand returns a The callable interface is similar to runnable, and both are designed for classes whose instances might be executed by another thread. However, Runnable does not return results, and cannot throw a checked exception callable and return the result.And an exception may be thrown when the returned result is obtained. The call () method in callable is similar to the runnable run () method, and the difference is the

Concurrent Programming: C++11 thread (Func, Args ...) Creating Threads with class member functions

C++11 is a new standard supported by VS2012, providing a convenient std::thread for concurrent programming.Examples of Use:#include voidThread_func (intArg1,intArg2,float*Arg3) {Arg3= (arg1*1.0)/(Arg1 +arg2); cout"arg1/(arg1 + arg2) ="Endl; return;}voidMain () {//Number of Threads intThreadnum =3 //Dynamic Allocationthread*T; T=NewThread[threadnum]; //Results float*result = (float*)malloc(threadnum*sizeof(float)); for(inti =0; i ) {T[i]= Thr

Java concurrent Programming (a) on thread safety

synchronization.public class Cachedfactorizer implements Servlet {private BigInteger lastnumber;private biginteger[] lastfactors; Private long Hits;private long cachehits;//can also declare hits and cachehits as volatile to achieve visibility public synchronized long Gethits () {R Eturn hits;} Public synchronized Double Getcachehitratio () {return (double) Cachehits;} public void Service (ServletRequest req, Servletresponse resp) {BigInteger i = extractfromrequest (req); biginteger[] factors =

Concurrent Programming (ii): Thread pool

Compared to the thread pool, we might touch new thread a bit more, since we have the new thread, why do we use the thread pool?The disadvantage of new threadA, each new thread to create an object, poor performanceb, the thread lacks the unified management, may the unrestricted new thread, competes with each other, may occupy excessive system resources to cause the freezing or oom (OutOfMemory)C, lack of more features, such as more execution, periodic execution, thread interruptionBenefits of the

Concurrent Programming (iv): Also talk about the lock mechanism of database

changes accordingly, and the amount of the two accounts is unchanged. The transfer out account does not appear to be deducted from the money, and the destination account does not receive the money in the case.Consistency: Ensure that the database always maintains the consistency of the data-before the transaction operation is consistent, and the transaction is consistent after the operation, regardless of whether the transaction is successful or not. As in the above example, the database is con

Multi-process of concurrent programming

cases, a process cannot be logically run,1. Process hangs is its own cause, encountering I/O blocking, it will let the CPU to allow other processes to execute, so that the CPU has been working2. Regardless of the process, it is the operating system level that may invoke other processes to use the CPU because one process takes up too much time, or a priority, and so on.Thus a process consists of three statesViii. concurrent implementation of the proce

Concurrent Programming (daemon)

, prevent p from creating child processes, and the parent process Code execution ends, p terminates the runP.start ()Print('Master')#as soon as the terminal prints out the line, the daemon p will end up.#OutputMainTwo exercisesThink about what might happen with the following code execution results? Why?from multiprocessing import Processimport timedef foo(): print(123) time.sleep(1) print("end123")def bar(): print(456) time.sleep(3) print("end456")if __name__ == ‘__main__‘:

JAVA-Concurrent programming-thread safety scenarios

must wait indefinitely in case the request lock fails    3.2 Memory locks must be freed in the code block that gets them, which simplifies the code well, but in some cases a more flexible locking mechanism provides better activity and performance  4 Advantages of Reentrantlock can poll and can be timed lock request, interruptible Lock acquisition operation  5 Reentrantreadwritelock read-write lock characteristics Reading-read not mutually exclusive, reading-writing mutex, write-write mutually e

Java concurrent programming art note Chapter 3 (1), java chapter 3

Java concurrent programming art note Chapter 3 (1), java chapter 3 1. Java threads communicate with programmersTransparent, But itsMemory visibility problemsYesCauseOther weird issues; 2. Two key issues need to be considered in parallel programming: 1. HowCommunication2. How are threads?Synchronization 3. In imperative progra

A kind of thinking about C ++ concurrent programming

Increasingly pressing challenges Nowadays, it is too common for a single machine to have multiple independent computing units, which is particularly evident in the server processor. According to AMD's 2012-2013 server road map, the number of server processors will reach 20 in 2013. Reasonable Use of CPU resources is an issue that must be considered. Many C ++ programmers still use multi-threaded models, but controlling multithreading is not an easy task. It is prone to errors and debugging durin

The ultimate guide to Oracle's C PL (SQL) programming, a weekly book

Tags: array rar organization Throw exception build log job schedule exec expressionThis week's book is the Ultimate guide to Oracle's C PL (SQL) programming, published by the mechanical industry press, Sun Fingdong, Wang Yu, Guo Xiaohui. Content Introduction: The ultimate guide to Oracle 12c PL/SQL is the most systematic, comprehensive, practical and authoritative

Java concurrent programming and high concurrency Solutions video tutorial

1th. Course Preparation1-1 Course Guidance1-2 Concurrent Programming First experience1-3 concurrency and high concurrency basic concepts2nd Chapter Concurrency Foundation2-1 CPU Multilevel Cache-cache consistency2-2 CPU Multi-level cache-Random order execution optimization2-3 Java memory model2-4 advantages and risks of concurrency3rd. Project Preparation3-1 Case Environment Initialization3-2 Case Preparati

"Old code said programming to play the Swift Lake" a book finally published

Today, our first book, based on XCode6.1 's latest version of Swift Grammar, has a lovely name: "The old code says programming to the Swift River," and a beautiful cover:This book is not a pedigree, it's just a five-bit it old yard kid.One day in May, we have a few old yards to the software park at the door of the small noodle restaurant to eat, chat suddenly on

Java concurrent programming practice Chapter 4 object combination Reading Notes

I. Design thread-safe classes in the process of designing thread-safety classes, there must be three basic elements: . Find all variables that constitute the object state. Find out the immutability condition of the constraint state variable. . Create a concurrent access management policy for the object status. The status of the analysis object starts from the object domain. Variables are divided by scope:. global variables. Local variables. Method row

Java concurrent Programming-Executor Framework (i) Executor,

1, a programming method of concurrent programming is to split the task into a few columns of small tasks, namely, runnable, and then submit these tasks to a Executor execution, executor.execute (runnalbe) . Executor uses its internal thread pool at execution time to complete the operation.Executor sub-interfaces are: Executorservice,scheduledexecutorservice, know

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