这段代码在单线程(在linux下就是单进程,因为linux没有严格的线程概念,linux只有进程)下运行是没有问题的,但是在多线程情况下,会包含着一个隐含的问题,这个问题需要从"--printer"的汇编代码才能看出,在x86平台上,"--printer"指令可能会被编译成如下的汇编指令 # printer--movl printer%eax decl%eax movl%eax print...
An introduction to kernel synchronization 当一个thread正在对数据进行读写操作时,另一个thread对同一个数据进行读写操作,这就会产生冲突竞争,比如重写数据单元等。为了解决这样的问题,必须考虑synchronization的问题。这样的竞争问题,并不总是能够复现,所以调试起来也比较困难。 这个需要被保护,防止被改变的section,称为...
net_cls -- 这个子系统使用等级识别符(classid)标记网络数据包,可允许 Linux 流量控制程序(tc)识别从具体 cgroup 中生成的数据包。 ns -- 名称空间子系统。 ##源码分析 如同namespace一样,线程Task的结构体struct task_struct中,必定有cgroups信息: linux-4.4.19/include/linux/sched.h #1668 代码语言:javascr...
Chapter 5. Kernel Synchronization You could think of the kernel as a server that answers requests; these requests can come either from a process running on a CPU or an … - Selection from Understanding the Linux Kernel, 3rd Edition [Book]
Linux内核中实现了一套经典的链表操作,定义在/include/linux/list.h文件中,本文基于linux内核源码6.2.7,记录了其常用操作链表的API函数,便于在阅读linux内核源码时更好的理解程序执行的过程和细节。 一、链表数据结构 定义在/include/linux/types.h文件中: ...
Synchronization Technique to Improve User-Level Performance in Kernel-Level EnvironmentThe most common use of RCU within the Linux kernel is as a replacement for reader-writer locking in read- intensive situations. Nevertheless, this use of RCU was not immediately apparent to me at the outset, in...
Methods to perform kernel synchronization The number of requests with which a kernel is dealing is likened to the number of requests a server has to receive. This situation can deal with race conditions, so a good synchronization method would be required. A number of policies are available for...
User-Mode Linux (UML); x86 architecture; Block layer subsystem; Android drivers; ATM drivers; Drivers core; Ublk userspace block driver; Bluetooth drivers; Character device driver; Hardware crypto device drivers; Buffer Sharing and Synchronization framework; DMA engine subsystem; Qualcomm firmware driv...
Cryptographic API;Buffer Sharing and Synchronization framework;GPU drivers;On-Chip Interconnect management framework;IOMMU subsystem;Multiple devices driver;Media drivers;VMware VMCI Driver;Network drivers;Microsoft Azure Network Adapter (MANA) driver;Device tree and open firmware driver;...
Chapter 13, Kernel Synchronization, Part 2 Don't forget: The companion book 'Linux Kernel Programming (Part 2): Writing character device drivers: Learn to work with user-kernel interfaces, handle peripheral I/O & hardware interrupts' is available as well! (Hey, the ebook is free!) - It...