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WebApr 21, 2024 · Getting Help. pgb April 20, 2024, 1:03pm 1. I stopped a backup in progress by accident and now the lock won’t remove. I had this before and I did what I always did: … This library implements a simple mutex lock in a similar way to ngx_proxy module's proxy_cache_lock directive. Under the hood, this library uses ngx_lua module's shared memory dictionaries. The lock waiting is nonblocking because we use stepwise ngx.sleepto poll the lock periodically. Back to TOC See more It is always a bad idea to share a single resty.lock object instance across multiple ngx_lua "light threads" because the object itself is stateful and is vulnerable to race conditions. It is highly recommended to always allocate a … See more To load this library, 1. you need to specify this library's path in ngx_lua's lua_package_path directive. For example, lua_package_path "/path/to/lua-resty-lock/lib/?.lua;;";. 2. you use requireto load the library into a local … See more One common use case for this library is avoid the so-called "dog-pile effect", that is, to limit concurrent backend queries for the same key when a cache miss happens. This usage is similar to the standard ngx_proxy module's … See more WebApr 9, 2024 · 非阻塞式加锁，正常情况下对一个信号量进行加锁，如果该信号量已经被加锁，pthread_mutex_lock会导致阻塞，而try_lock并不会导致阻塞。解锁对互斥量进行加一，即mutex++（或+1），同时将阻塞在该锁上的所有线程全部唤醒。注意：函数的全特化必须位于泛化版本之前进行声明·加锁操对互斥量进行减一 ... svitlana popova