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 ...

Keywords of this article: Thread, thread pool, single thread, multithreading, benefits of thread pool, thread recycling, creation method, core parameters, underlying mechanism, rejection policy, parameter setting, dynamic monitoring, thread isolation The knowledge related to threads and thread pools is a knowledge point that we will encounter ...

1. Overview of design mode [concept] some writing methods of code: flexible program and convenient maintenance; But the code is obscure and not easy for others to take over. 2. Single case design mode [concept]: there is one or some special class in the whole project. Only one object belonging to this class can be created. 3. Shared dat ...

preface In python crawlers, multi process crawling is generally used, because multithreading can not improve CPU utilization, and multithreading is actually executed alternately, and multi process is executed concurrently. Multi process, as the name suggests, multiple processes execute concurrently, which can effectively improve the execu ...

1. Three elements of network programming Network programming refers to the program running on different computers under the network communication protocol, which can carry out data transmission 1.1 IP address IP address: it is the unique identification of the device in the network IP addresses fall into two categories: IPv4: assign a 32bit ...

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 ...

Process and Thread Speaking of process, we have to say procedure. Program is an ordered collection of instructions and data. It has no running meaning. It is a static concept.The process is an execution process of the execution program, which is a dynamic concept. It is the unit of system resource allocation.Usually, there can be several ready ...

Opening Now all applications need to monitor or alarm the log. Now the common practice is to collect the log by EKL, and then display the content and alarm strategy by Grafana. If the project architecture is relatively simple (single application) and you don't want to rely on so many middleware, here is a simple way to do it~ Inherit Unsynchr ...

Multithreading Multi task execution If there is no multitasking, multithreading is not required program Java source Program and bytecode file are called "Program", which is a static concept. process The program in execution is called process, which is a dynamic concept. In order for the computer program to run, the c ...

1, Introduction to ThreadLocal When multiple threads access the same shared variable, it is easy to have concurrency problems, especially when multiple threads write to a variable. In order to ensure thread safety, general users need to take additional synchronization measures when accessing shared variables to ensure thread safety. ThreadLoca ...