Linux barrier-阿里云

Linux内核：memory barrier（下）

这种情况下，cpu 0和cpu 1执行的指令和动作描述如下：由于增加了memory barrier，保证了a、b这两个变量的访问顺序，从而保证了程序逻辑。三、linux kernel的APIlinux kernel的memory barrier相关的API列表如下：barrier()这个...

Linux内核：memory barrier（中）

（2）Store buffer我们考虑另外一个场景：在上一节中step e中的操作变成CPU 0对共享变量进行写的操作。这时候，写的性能变得非常的差，因为CPU 0必须要等到CPU n上的cacheline 数据传递到其cacheline之后，才能进行写的操作（CPU n上的cacheline 变成...

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Linux内核：memory barrier（上）

一、前言我记得以前上学的时候大家经常说的一个词汇叫做所见即所得，有些编程工具是所见即所得的，给程序员带来极大的方便。对于一个c程序员，我们的编写的代码能所见即所得吗？我们看到的c程序的逻辑是否就是最后CPU运行的结果呢？很遗憾，不是，我们的“所见”和最后的执行结果隔着：1、编译器2、C...

Linux内核同步机制之（三）：memory barrier【转】

转自：http://www.wowotech.net/kernel_synchronization/memory-barrier.html 一、前言我记得以前上学的时候大家经常说的一个词汇叫做所见即所得，有些编程工具是所见即所得的，给程序员带来极大的方便。对于一个c程序员，我们的编写的代码能所见即...

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更新时间 2023-04-20 10:08:59

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