Linux信号量操作的相关内容

文章 2024-05-11 来自：开发者社区

linux信号量与PV操作知识点总结

信号量信号量(semaphore) 与已经介绍过的 IPC 结构不同，它是一个计数器，信号量用于实现进程间的与斥与同步，而不是用于存储进程间通信数据。 1、特点（1）信号量用于进程间同步，若要在进程间传递数据需要结合共享内存（2）信号量基于操作系统的 PV 操作，程序对信号量的操作都是原了操作。（3）每次对信号量的 PV 操作不仅限于对信号量值加 ...

文章 2017-06-14 来自：开发者社区

需求源于项目中一部分设计的代码。struct semaphore类型的信号量，使用up()进行释放，down_interruptible()和down()获得指定信号量（前者中，若该信号量已争用则进入可中断睡眠，后者进入不可中断睡眠）。　　理想中的流程应该是线程调用down()阻塞一个信号量，等待另一个线程调用up()释放，从而实现同步。但如果另一个线程使用up()释放多次，会有怎样的结果呢？....

问答 2016-07-12 来自：开发者社区

关于linux进程信号量P、V操作的问题

在《linux操作系统教程》中有这么一段：最下面的“...若减后的值小于0...”为何不是小于等于0？等于0时就没有资源应该进行阻塞了呀？还有后面的“...若加后的值

问答 2016-06-06 来自：开发者社区

想请问linux应用程序使用信号量实现PV操作的问题

我的问题是，比如实现进程的同步，我在创建子进程之间创建信号量，在fork之后，不是父子进程拥有独立的数据空间吗？那么父子进程的PV操作如何影响同一个信号量的呢，比如父进程先P操作，若信号量初始值为0，此时为0-1=-1，但是这个不是父进程的吗？子进程为什么其中的信号量也-1了呢？

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更新时间 2024-07-13 20:43:18

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