What is the proper use of mlock(2)/munlock(2)?

[Daniel Rudy]

At about the time of 3/28/2006 10:42 PM, Norbert Koch stated the following:
> 
> Daniel Rudy schrieb:
>> Hello FreeBSD Hackers,
>>
>> I've been reading the man page on mlock(2) and a number of questions
>> have arisen about it's use.  I have looked at malloc and mmap, and I
>> have not been able to figure this one out.  There doesn't seem to be any
>> compiler or library options dealing with this either.
>>
>> 1) How do you make sure that an allocated address range has been aligned
>> on a multiple of the page size given FreeBSD's virtual address map?
> 
> Memory allocated by calling mmap(2) is always page aligned. And its
> size is always rounded up to a multiple of getpagesize(3).
> 
>  From mmap(2):
> 
> The mmap() function causes the **pages** starting at addr and continuing
> for at most len bytes to be mapped from the object described by fd,
> starting at byte offset offset. If len is not a multiple of the
> pagesize, the mapped region **may extend past** the specified range.
> Any such extension beyond the end of the mapped object will be
> zero-filled.
> 
> 
> Norbert
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> 

I'm not sure why I missed that, but thank you for pointing that out.

-- 
Daniel Rudy