Re: Proper use of mlock(2)
- From: Thomas Maier-Komor <thomas@xxxxxxxxxxxxxx>
- Date: Wed, 29 Mar 2006 12:57:55 +0200
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Daniel Rudy wrote:
What is the proper use of mlock(2)? In the man page, it states that the
addr param *should* be aligned on a page boundary. The question is how
do you find out if it is or isn't? Or better yet, how do you force an
allocation on a page boundary?
I can use getpagesize(2) to find out what the page size is, but with
FreeBSD and it's virtual address memory model, how do you force a memory
allocation in the virtual address space to align to a physical page
boundary?
My OS is FreeBSD 6.0.
Thanks.
you don't have to care about virtual to physical mapping. If your
virtual address is a multiple of pagesize everything is fine. You cannot
force a malloc to return a multiple of pagesize as the base address of
the allocated memory block, but you can allocate a big enough block, so
that you can calculate an aligned address within that block.
Tom
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