![]() In the later section Section 5.4, we show how these synchronization techniques can be combined to effectively protect kernel data structures. ![]() Let's now briefly discuss each synchronization technique. Mutex is used as a synchronization primitive in situations where a resource has to be shared by multiple. A mutex is a POSIX threads construct, and is created using the pthreadcreatemutex library call. This article is a continuation of the Series on Linux Device Driver.This is the Mutex in Linux Kernel Linux Device Driver Tutorial Part 22. ![]() Mutexes The word mutex is derived from the term mutual exclusion. Various types of synchronization techniques used by the kernelĪtomic read-modify-write instruction to a counterįorbid interrupt handling on a single CPUįorbid deferrable function handling on a single CPUįorbid interrupt and softirq handling on all CPUs The three thread synchronization mechanisms used on Linux are mutexes, barriers, and condvars. For instance, local interrupts disabling applies to just one CPU (other CPUs in the system are not affected) conversely, an atomic operation affects all CPUs in the system (atomic operations on several CPUs cannot interleave while accessing the same data structure). The best synchronization technique consists in designing the kernel to avoid the need for synchronization in the first place. The "Applies to" column indicates whether the synchronization technique applies to all CPUs in the system or to a single CPU. Process synchronization in Linux Kernel 10 min read. Table 5-1 lists the synchronization techniques used by the Linux kernel. Table 5-1 lists the synchronization techniques used by the Linux kernel. Understand the essentials of key internals topics such as kernel architecture, memory management, CPU scheduling, and kernel synchronization Book Description Linux Kernel Programming is a comprehensive introduction for those new to Linux kernel and module development. We now examine how kernel control paths can be interleaved while avoiding race conditions among shared data. ![]() A critical region is any section of code that must be completely executed by any kernel control path that enters it before another kernel control path can enter it. In this chapter, a race condition can occur when the outcome of a computation depends on how two or more interleaved kernel control paths are nested. The same definitions apply to kernel control paths. Chapter 1 introduced the concepts of race condition and critical region for processes. ![]()
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