Posix共享内存与映射文件 [英] Posix shared memory vs mapped files

问题描述

任何人都可以了解到有关该主题的知识，那么POSIX共享内存(shm_open)和POSIX映射文件(mmap)的真正区别是什么?

Having learnt a bit about the subject, can anyone tell, what is the real difference between POSIX shared memory (shm_open) and POSIX mapped files (mmap)?

两者似乎都使用/dev/tmpfs子系统，而不是使用较旧的IPC机制.

Both seems to use the /dev/tmpfs subsystem, rather then older IPC mechanism.

那么使用mmap文件而不是共享内存有什么优势?

So is there any advantage of using mmap file over shared memory?

谢谢.

推荐答案

区别并不总是很清楚.共享内存可以通过内存映射文件来实现. 在此可以找到很好的文章(如应用于C/C ++编程.)

The distinction is not always clear. Shared memory can be implemented via memory mapped files. An excellent write on this can be found here (as applied to C/C++ programming).

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