Programmer Think

Welcome to< Concurrent King class >, this article is the 13th in this series. In the last article, we introduced several strategies to avoid deadlock. Although deadlock is notorious, in concurrent programming, in addition to deadlock, there are some equally important thread activity issues that deserve attention. Their popularity is not ...

Wait timeout mode When calling a method, wait for a period of time. If the method can get the result within a given period of time, the result will be returned immediately. On the contrary, the timeout will return the default result. Assuming that the timeout period is T, it can be inferred that the timeout will occur after the current time n ...

Original address ThreadLocal brief introduction ThreadLocal is a local thread copy variable utility class. It is mainly used to map the private thread and the copy object stored by the thread. The variables between threads do not interfere with each other. In high concurrency scenarios, stateless calls can be realized. It is especially suitab ...

semaphore Pronunciation: English[ ˈ sem ə f ɔː ®] Beauty[ ˈ sem ə f ɔː r] Semaphore (semaphore) provides a more powerful control method for multi-threaded cooperation, synchronized and reentrant lock. These two locks can only allow one thread to access one resource at a time, and semaphore can control how many threads can access specific ...

Wedge In the last article, we learned the volatile keyword. In this article, we continue to learn another keyword commonly used in concurrent programming - synchronized. synchronized usage First, let's look at several common ways to use synchronized. Use synchronized(this) to decorate code blocks class SyncThread implements Runnable { ...

catalogue Producer and consumer model Overview of producer and consumer models [application] Producer and consumer case [application] Producer and consumer case optimization [application] Basic use of blocking queue [understanding] Blocking queue realizes waiting wake-up mechanism [understanding] Producer and consumer model Overview ...

catalogue 1, What is ForkJoin 2, ForkJoin is easy to use 3, ForkJoin principle Core API Job theft algorithm ForKJoin principle 1, What is ForkJoin "Divide and conquer" is an idea. The so-called "divide and conquer" is to divide a complex algorithm problem into several smaller parts according to a certain "dec ...

introduction In the previous article, we introduced the Semaphore of AQS ， and it should be countdown latch ， next. What is CountDownLatch CountDownLatch is implemented through a counter. The initial value of the counter is the number of threads. Every time a thread is executed, the value of the counter will be reduced by 1. When the value ...

The purpose of concurrent programming is to make the program run faster, but it is not to start more threads to maximize the concurrent execution of the program. In concurrent programming, if the program runs faster through multithreading, it will face many problems, such as context switching, deadlock, and resource problems limited by h ...

Thread six states New: a new thread object has been created, but the start() method has not been called yet.Runnable: the two states of ready and running in Java threads are generally called "running". After the thread object is created, other threads (such as main thread) call the start() method of the object. The thread in ...