pleriche
Support for read-only memory?
Is it possible to allocate memory with FastMM5 and make part of that memory read-only?
Hi Gerben,
Unfortunately PC hardware only supports memory protection at the page level, which is 4096 bytes. You could allocate a block via FastMM and then call VirtualProtect to change the page the block is in to read-only mode, but you'll run into trouble if the adjacent blocks are written to by your application.
Alternatively you could allocate a 4K page via VirtualAlloc yourself, and then you can control the protection flags on that page without risk to adjacent blocks.
Best regards, Pierre
Yes, that is what I wanted. Thank you.
On Sat, Jul 30, 2022 at 11:00 AM Pierre le Riche @.***> wrote:
Hi Gerben,
Unfortunately PC hardware only supports memory protection at the page level, which is 4096 bytes. You could allocate a block via FastMM and then call VirtualProtect to change the page the block is in to read-only mode, but you'll run into trouble if the adjacent blocks are written to by your application.
Alternatively you could allocate a 4K page via VirtualAlloc yourself, and then you can control the protection flags on that page without risk to adjacent blocks.
Best regards, Pierre
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