Programmer Think

Although there have been a lot of blogs about thread join() methods, I was confused a few days ago, but I didn't get a detailed explanation, that is, when multiple threads are running in the system, which threads are suspended by join(). Most of the examples given by bloggers look like t.join() method will make all threads pause and wait for th ...

This article will directly give several examples to see how python implements multithreading. Previously in c + + An article In, the concept of multithreading is introduced. We won't continue to explain it here. If you are interested, you can click the link to understand it. Python 3 uses two standard libraries_ Thread and threading provid ...

Thread class is a class used by the jvm to manage threads. In other words, each thread has a unique thread object associated with it. 1.1 common methods of thread class //Simple example Thread t1=new Thread(); Thread t2=new Thread(new Runnable() { @Override public void run() { System.out.println(); ...

I Exception 1.Exception: exception Compile time exception and runtimeException: Problems occur during the operation of the program (code writing is not rigorous), As long as it is not a subclass of RuntimeException, it is a compile time exception; 2. Compile time exception: the exception that needs to be checked before the program runs &nbs ...

AQS(CLH) Bottom layer: CAS+volatile graphic The core of aqs is a state (volatile) and a two-way linked list that monitors the state. Each linked list has a node and each node is loaded with threads. If each thread wants to obtain a lock and wait, it must enter the waiting queue. (when adding the tail of the queue, we should pay attention to the ...

Disadvantages of new Thread Each time a new Thread creates a new object, the performance is poor.Threads lack unified management. They may create unlimited new threads, compete with each other, and may occupy too many system resources, resulting in panic or OOM (out of memory) Memory overflow). The reason for this problem is not simply that ne ...

1. Learning harvest learning methodHow to ensure thread safety?Basic use of SynchronizedStorage of locksUpgrade principle of Synchronized lockThread communication with wait/notify 2. Learning methods Scenario - > requirement - > solution - > Application - > principle Scenarios: multithreaded scenariosRequirements: thread saf ...

Blocking queue Blocking queue is a special queue. JDK provides many kinds of blocking queues. However, LinkedBlockingDeque and PriorityBlockingQueue are common. They both implement the BlockingQueue interface. Here, LinkedBlockingDeque is mainly used to implement the producer consumer model. LinkedBlockingDeque is a bounded blocking q ...

You will know why interviewers like to ask such questions! One day, Zhang San went to an interview and was asked a question by the interviewer: What is multithreading? Zhang San: multithreading means that multiple threads execute on the CPU, seize CPU resources and improve CPU execution efficiency Interviewer: what are you talking about? W ...

Most of them are generated in the use of wait() and notify()? The reason for the error is: synchronized(A) and B.wait(),A and B should be the same object. If you search this and report an error, I think your foundation should not be very good. So keep looking. So this article talks about how to correctly use notify()/notifyAll() and wait(). ...