Programmer Think

1. The network is divided by coverage: LAN / man / WAN, Internet / Internet, Ethernet / token ring - networking mode 2. Each host must be represented by one in the network to realize point-to-point accurate communication IP address: ipv4: uint32_t unsigned 4-byte integer} DHCP/NAT} ipv6: uint_t addr[16]; Each data in network communication mu ...

1. ThreadLocal introduction 1.1 official introduction From the description in the official Java document: the ThreadLocal class is used to provide local variables inside the thread. When this variable is accessed in a multithreaded environment (through get and set methods), it can ensure that the variables of each thread are relatively in ...

At the beginning of the article, let's ask a question. If OOM occurs in one thread of a java program, can other threads in the process still run? Next, do an experiment to see if the six kinds of JVM programs can be accessed after OOM. Here I use a springboot program. /** * @author : charon * @date : Created in 2021/5/17 8:30 * @descripti ...

Absrtact: the deep integration of cloud stack is the key to releasing the power of cloud database. Huawei cloud is in a leading position in achieving this goal, as proved by GaussDB(for MySQL). This article is shared from Huawei cloud community< Near data processing (NDP), crowning the performance improvement of GaussDB(for MySQL) >, auth ...

In Alibaba java development manual, it is written that thread pools are not allowed to be created using Executors, but through ThreadPoolExecutor. The disadvantages of thread pool objects returned by Executors are as follows: 1) FixedThreadPool and SingleThreadPool: The allowed request queue length is integer MAX_ Value, which may accumulate a ...

process Basic concepts Process is a dynamic process of a program, and it is also the smallest unit of program execution and resource management allocation. Process lifecycle Create - > schedule - > execute - > die Process status: ready, running, blocked, etc. Three elements of process 1. Program (instruction and data) 2. Virtual m ...

Linux thread synchronization 1. Mutual exclusion Ensure that only one thread accesses data at a time. pthread_mutex_t mut; //Two initialization methods mut = PTHREAD_MUTEX_INITIALIZER; pthread_mutex_init(&mut, NULL); 1. Initialization int pthread_mutex_init (pthread_mutex_t *__mutex, const pthread_mutexat ...

Multithreading Distinction between threads and processes 1. Thread is the smallest unit of program execution, and process is the smallest unit of resources allocated by the operating system 2. A process is composed of one or more threads. Threads are different execution routes of code in a process 3. Processes are independent of each other, b ...

JUC notes JUC concurrent programming (I) - multithreading review, Synchronized and Lock locks, Condition thread communication, eight Lock problemJUC concurrent programming (II) - set insecurity and solutions under concurrency, read-write lock, blocking queue 10. Callable review Details: Multithreaded pickup The difference between Cal ...

1, What is CountDownLatch? CountDownLatch is a synchronization tool class in Java util. In the current package, it is a tool class commonly used in JUC programming, allowing one or more threads to wait until other threads are running.    its implementation is simply to give a specified value to the timer during initialization t ...