mmap implementation for cdev

[Poul-Henning Kamp]

In message <A51F9B30-A71A-49A5-B684-16EC3C127BC9 at gmail.com>, Filippo Sironi wri
tes:

>The problem is that when I come =
>back to user space all the threads write in memory page mapped by the =
>first thread that called the mmap leaving their memory pages untouched.

That's how cdev->mmap works, it is global rather than per-thread.


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.