java concurrency tutorial

This is a complete Java concurrency collation note, which records some of my experiences and experiences in recent years of learning Java concurrency. J.U.C Overall understanding Atomic Operation Part 1 starting from Atomicinteger Atomic Operation Part 2 array, atomic operation of the reference Atomic Operati

1. Several important concepts about high concurrency 1.1 Synchronous and asynchronous First of all, synchronous and asynchronous refers to the function/method invocation aspect. Obviously, the synchronous call waits for the return of the method, and the asynchronous call returns instantaneously, but the instant return of the asynchronous call does not mean that your task is done, and he will continue the task in the background with a thread. 1.2

? In fact, there is no difference in the cost of process and thread creation under Linux (All task_struct), but the way that data can be shared between processes is implemented only through very complex IPC, where the code is shared and the address space is shared, so the way to share data is more efficient. (Process to consider isolation, one process has no way to directly access another process; threads do not have to be quarantined, shared memory between threads)We modify a multithreaded vers

Java Concurrency structureOriginal link: http://gee.cs.oswego.edu/dl/cpj/mechanics.htmlContent Thread Synchronous Monitor ThreadA thread is a sequence of calls that are executed independently, and the threads of the same process share some system resources (such as file handles) at the same time to access the object resources (memory resources) created by the same process. The Java.lan

); } } }Static class withdrawthread implements Runnable {Account Account;intAmount PublicWithdrawthread (Account account,intAmount) { This. account = account; This. Amount = Amount; } Public voidRun () { for(inti =0; I 100000; i++) {Account.withdraw (amount); } } } }The first execution result is 10200, the second execution result is 1060, and the result of each execution is indeterminate, because the order in which the thre

Java concurrency, I declare in advance that I am only a newbie to java concurrency. This article is just a summary and insights I have read the art of java concurrent programming (the content mainly involves the first three chapters. I hope you can discuss more about the er

Today's review is familiar with some concepts of Java concurrency.Program: The system to complete a task, is a program;Process: Each running program is a process, Windows Task Manager can see each process, Linux under the use of the ps–e command to view all currently running processes;Threads: Each running program (process) may contain multiple sequential execution flows, each of which can be considered a thread.1. Characteristics of the process:1) In

[Why use concurrency ?]1. ImproveProgramRunning SpeedWhen running on a multi-core or multi-processor system, concurrent programs can take full advantage of multiple execution units to speed up; however, when running concurrent programs on a single processor, there are two scenarios: when there is a blocking in the Program (for example, I/O blocking), concurrency can increase the speed. If it is a CPU-consum

only need to write some packages that can achieve our goal, we will adjust it based on our specific needs ". However, it is often because you have quickly extended the compiled simple tool and tried to add more features until you compile a complete infrastructure service. At this point, you usually stick to the program you write, whether it is good or bad. You have already paid all the cost for building your own program, so in addition to the actual migration cost invested by the general implem

IntroductionWhen it comes to the volatile keyword, most developers have a certain understanding, which can be said to be a very familiar and very unfamiliar keyword for developers. The equivalent of lightweight synchronized, also known as lightweight locks, is less expensive than synchronized, with visibility, ordering, and partial atomicity, which is a very important keyword in Java concurrency. In this ar

" phenomenon and "the main memory synchronization delay in working memory" phenomenon.The Java language provides the volatile and synchronized two keywords to ensure the ordering of operations between threads, and the volatile keyword itself contains the semantics of prohibiting command reordering, while synchronized is the " A variable that allows only one thread to lock on it at the same time "this rule determines that two synchronized blocks holdin

Java concurrency concepts, base interfaces, and thread This series of articles mainly on Java concurrency related content, including synchronization, lock, semaphore, blocking queue, thread pool, etc., the overall mind map is as follows: This paper mainly explains the concurrency