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Linux设备驱动程序（五）——并发和竞态 2

五、自旋锁信号量对互斥来讲是非常有用的工具，但它并不是内核提供的唯一的这类工具。相反，大多数锁定通过称为“自旋锁（spinlock）”的机制实现。和信号量不同，自旋锁可在不能休眠的代码中使用，比如中断处理例程。在正确使用的情况下，自旋锁通常可以提供比信号量更高的性能。一个自旋锁是一个互斥设备...

Linux设备驱动程序（五）——并发和竞态 1

前言并发相关的缺陷是最容易制造的，也是最难找到的，为了响应现代硬件和应用程序的需求，Linux 内核已经发展到同时处理更多事情的时代。这种变革使得内核性能及伸缩性得到了相当大的提高，然而也极大提高了内核编程的复杂性。一、scull 的缺陷scull 内存管理代码的一些片段，深入到驱动程序的 writ...

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更新时间 2023-09-28 09:47:37

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