Programmer Think

java thread pool configuration details ThreadPoolExecutor full parameter construction public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> work ...

Brain map Four thread safety policies   Thread limit An object restricted by a thread, which is exclusive to the thread and can only be modified by the thread that owns it shared read-only A shared read-only object can be accessed concurrently by multiple threads without additional synchronization, but no thread can modify it ...

 1. Thread state Threads have five statuses: new; be ready; Obstruction; function; death New state: a new thread state created by the new Thread() method Ready state: enter the ready state after starting through the start () method. It is not executed immediately and waits for CPU scheduling Blocking state: use the sleep() method or sy ...

1, Producer consumer issues 1. Problems Suppose that only one product can be put in the warehouse, the producer puts the produced products into the warehouse, and the consumer takes the products from the warehouse for consumptionIf there is no product in the warehouse, the producer puts the product into the warehouse. Otherwise, stop producti ...

Singleton mode The common writing methods of single case mode include lazy mode, hungry mode, double check mode, etc. Lazy mode is to create objects when you use them.Hungry man mode is a static object that has been loaded in advance.Double check mode is to check twice before and after locking to prevent multiple threads from creating multipl ...

catalogue 1, Multithreading module: threading Two, module function 1 create thread 2. Start thread 3. Wait for thread 4. Thread lock 5. Number of threads currently alive Tip: the following is the main content of this article. The following cases can be used for reference 1, Multithreading module: threading threading module is a ...

preface For the concepts of process, multithreading and fork, please see the two articles I wrote before. Linux: process control (process creation, process termination, process waiting, process program replacement) Linux: detailed explanation of multithreading (thread concept, thread control - thread creation, thread termination, thread wa ...

1, Inherit Thread class The Thread class essentially implements an instance of the Runnable interface. It starts a new Thread by inheriting the Thread class and copying the run method. Calling the start method tells the CPU that the Thread is ready to execute, and then the system will execute its run method when it has time. Directly calling t ...

Multi process A running program is called a process 3. Multi process and multi task 3.1 process creation # 1. Import process package import multiprocessing # 2. Create process objects through process classes Process object = multiprocessing.Process() # 3. Start the process and perform the task Process object.start() 3.2 creating proce ...

Understanding concurrency and parallelism Concurrency refers to the execution of multiple tasks at the same time for a CPU - in essence, it is divided into time slices. Because the time is very short, it gives the impression that it is executed at the same time; Parallel is for multiple CPUs to execute multiple tasks at the same time (one ...