locking

问题 I am using a Python 3 sequence like this: lock = threading.Lock() res = lock.acquire(timeout=10) if res: # do something .... lock.release() else: # do something else ... I would prefer to use a with-statement instead of explicit "acquire" and "release", but I don't know how to get the timeout effect. 回答1: You can do this pretty easily with a context manager: import threading from contextlib import contextmanager @contextmanager def acquire_timeout(lock, timeout): result = lock.acquire(timeout

问题 What is Azure Lease Blob? Is it just a mechanism which provides an exclusive lock to the blob storage? What is special about it? Where can I use it? I tried to read Azure documents, but it's not clear to me yet. 回答1: What is Azure Lease Blob? Is it just a mechanism which provides an exclusive lock to the blob storage? Your understanding is correct. When you lease a blob, you acquire an exclusive lock on that blob. As long as the blob is leased, no one other than lease holder can modify or

问题 What is Azure Lease Blob? Is it just a mechanism which provides an exclusive lock to the blob storage? What is special about it? Where can I use it? I tried to read Azure documents, but it's not clear to me yet. 回答1: What is Azure Lease Blob? Is it just a mechanism which provides an exclusive lock to the blob storage? Your understanding is correct. When you lease a blob, you acquire an exclusive lock on that blob. As long as the blob is leased, no one other than lease holder can modify or

问题 My question is related to multithreading lock-free synchronization. I wanted to know the following: What are general approaches to achieve this? I read somewhere about LockFreePrimitives like CompareAndExchange (CAS) or DoubleCompareAndExchange (DCA) but no explanation for those were given? Any approaches to MINIMIZE use of locks? How does Java/.NET achieve their concurrent containers? Do they use locks or lock-free synch? Thanks in advance. 回答1: Here are some general approaches that can

问题 I am trying to implement a generic thread-safe Cache method, and I wonder how I should implement the lock in it. It should look something like this: //private static readonly lockObject = new Object(); public T GetCache<T>(string key, Func<T> valueFactory...) { // try to pull from cache here lock (lockObject) // I don't want to use static object lock here because then every time a lock is performed, all cached objects in my site have to wait, regarding of the cache key. { // cache was empty

问题 I am trying to implement a generic thread-safe Cache method, and I wonder how I should implement the lock in it. It should look something like this: //private static readonly lockObject = new Object(); public T GetCache<T>(string key, Func<T> valueFactory...) { // try to pull from cache here lock (lockObject) // I don't want to use static object lock here because then every time a lock is performed, all cached objects in my site have to wait, regarding of the cache key. { // cache was empty

问题 I am trying to implement a generic thread-safe Cache method, and I wonder how I should implement the lock in it. It should look something like this: //private static readonly lockObject = new Object(); public T GetCache<T>(string key, Func<T> valueFactory...) { // try to pull from cache here lock (lockObject) // I don't want to use static object lock here because then every time a lock is performed, all cached objects in my site have to wait, regarding of the cache key. { // cache was empty

来源： https://stackoverflow.com/questions/56491215/how-to-properly-lock-a-task-run-block

来源： https://stackoverflow.com/questions/56491215/how-to-properly-lock-a-task-run-block

来源： https://stackoverflow.com/questions/7713049/read-locks-and-write-locks