转载自:   http://preshing.com/20130922/acquire-and-release-fences/ Acquire and release fences, in my opinion, are rather misunderstood on the web right now. That’s too bad, because the C++11 Standards Committee did a great job specifying the meaning of…

An operation has acquire semantics if other processors will always see its effect before any subsequent operation's effect. An operation has release semantics if other processors will see every preceding operation's effect before the effect of the op…

Python用上锁和解锁  lock lock.acquire lock.release 模拟抢火车票 import jsonimport timefrom multiprocessing import Process, Lock # with open('catalogue.json', 'w') as fp:# dic = {'total': 3}# json.dump(dic, fp) def check(buyers): with open('catalogue.json', mode=…

https://blog.csdn.net/sophia__yu/article/details/84313234 Lock是一个接口,通常会用ReentrantLock(可重入锁)来实现这个接口. 独占式获取锁 1.lock() ReentrantLock lock=new ReentrantLock(); lock.lock(); 当获取锁时通常会调用ReentrantLock的lock()方法.而lock()方法在ReentrantLock是一个抽象方法,默认情况下ReentrantLoc…

概念: 摘录自:http://preshing.com/20120913/acquire-and-release-semantics/ Acquire semantics is a property which can only apply to operations which read from shared memory, whether they are read-modify-write operations or plain loads. The operation is then…

The JSR-133 Cookbook for Compiler Writers by Doug Lea, with help from members of the JMM mailing list. dl@cs.oswego.edu. Preface: Over the 10+ years since this was initially written, many processor and language memory model specifications and issues…

[Game Engine Architecture 5] 1.Memory Ordering Semantics These mysterious and vexing problems can only occur on a multicore machine with a multilevel cache. A cache coherency protocol is a communication mechanism that permits cores to share data betw…

Lock-free programming is a challenge, not just because of the complexity of the task itself, but because of how difficult it can be to penetrate the subject in the first place. I was fortunate in that my first introduction to lock-free (also known as…

为何须要fence fence怎样使用 软件实现的opengl 硬件实现的opengl 上层使用canvas画图 上层使用opengl画图 下层合成 updateTexImage doComposeSurfaces DisplayDevice和FramebufferSurface 关于fence.不错的參考文章http://blog.csdn.net/jinzhuojun/article/details/39698317.本文结合代码分析下自己理解的fence的产生和传递. 为何须要fence…

https://baike.baidu.com/item/内存屏障 内存屏障,也称内存栅栏,内存栅障,屏障指令等, 是一类同步屏障指令,是CPU或编译器在对内存随机访问的操作中的一个同步点,使得此点之前的所有读写操作都执行后才可以开始执行此点之后的操作.   中文名 内存屏障 别    称 内存栅栏,内存栅障 性    质 同步屏障指令 条    件 现代计算机为了提高性能 简介 编辑 大多数现代计算机为了提高性能而采取乱序执行,这使得内存屏障成为必须. 语义上,内存屏障之前的所有写操作都要写入…