Re: locking question: do_mmap(), do_munmap()

Stephen C. Tweedie
1999-10-11T22:23:54Z

Hi,

On Mon, 11 Oct 1999 12:07:08 -0700 (PDT), kanoj@google.engr.sgi.com
(Kanoj Sarcar) said:

>> What about something like a rw-semaphore which protects the vma list:
>> vma-list modifiers [ie merge_segments(), insert_vm_struct() and
>> do_munmap()] grab it exclusive, swapper grabs it "shared, starve
>> exclusive".
>> All other vma-list readers are protected by mm->mmap_sem.

> I have tried to follow most of the logic and solutions proposed
> on this thread.

It will deadlock.

--Stephen