1/9/2024 0 Comments Ubuntu install gosyncWhen the entry for a given key is only ever written once but read many times, as in caches that only grow. The two most common suitable scenarios are: It is a good idea to store the temporary hash keys in Pool, saving the memory overhead of hash operations. lock sync.Mutex func(c *cache) Get(key string) interfaceįor scenarios with a large number of calls to the Log method, we obtain a Buffer from Pool and put it back then to reduce the creation of Buffer, for example, the hash operation in the token validation process in Kubernetes. TryLock is very useful! Imagine a cache that needs to be updated synchronously: You hope the request for subsequent updates can exit as soon as possible to shorten the “silly” waiting because this cache can speed the process by accepting outdated data. I can’t agree more on some cases put forward in the proposal. Note that while correct uses of TryLock do exist, they are rare, and use of TryLock is often a sign of a deeper problem in a particular use of mutexes. However, in Go, it was finally brought into reality( proposal) after the 9 years of battle since 2013 but still marked with a reminder on API. This method is commonly seen in other languages, such as ReentrantLock in Java, and Lock.acquire(False) in Python. Get the lock in a lightweight way, avoiding blocking threads. Release the lock according to the different conditions of the current lock, and transfer the lock ownership as “fairly” as possible, offering two paths as the Lock does, fast and slow. In short, Mutex is fair to various “competitors.” ![]() And the two modes of normal and starvation in the Mutex source can, to some extent, determine the priority of the threads in the queue, involving which thread to be put into the queue, whether the newly added thread is allowed to spin, etc. Now, we leave it to the processor logic to determine whether and when the thread can get the lock. Acquire the lock, or queue to wait if the lock is occupied, and the thread turns into a blocked state. ![]() Undoubtedly, the core of the sync package is Mutex, an implementation of an exclusive lock, based on which almost all sync logic is built. Except for the Locker interface and Mutex, the rest RWMutex, Cond, WaitGroup, Pool and Once are all sync types built on top of Mutex to support special scenarios. Therefore, there are only 7 types in the sync package in total. Before 1.18, there was actually only one set of methods, Lock and UnLock, if you regard RLock and RUnlock as the same in the core but only different in form. To better explain: Java sync can be realized by the synchronized keyword, ReentrantLock and volatile While, Go rids itself of the complexity but supports only two types, Mutex and RWMutex. The sync package is an integral part of the Golang concurrency implementation, and Go uses simple locks compared to other languages.
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