llvm dev - Sep 2004 - [LLVMdev] Patch to lib/System/Interix

>From: Reid Spencer <reid at x10sys.com>
>Date: Thu, 16 Sep 2004 13:26:09 -0700
>
>Okay, so the question is, how do you do the equivalent of a MAP_ANON 
>allocation on Interix. We don't want to map a file here. We're just
asking
>for virtual memory (unbacked by swap or file) to be allocated to the 
>process. Is there a way to do that on Interix? The corresponding way to do 
>that in Win32 is with the VirtualAlloc function. Perhaps we need to use 
>that directly? Is it available? Am I asking enough questions? :)
>
U grill me with all those questions :)

No, we cannot use VirtualAlloc function directly.

Since you're only interested in allocating memory in page sizes

For convienience I provide you with a link to Interix migration/porting 
pages:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnucmg/html/ucmglp.asp

Look in chapter 9, although it is very thin on the subject of memory mapped 
files.

It's getting late for me. I'll try to look on the subject in the
weekend...

Henrik

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Okay, the page you mentioned advocates opening the /dev/zero device and then 
mmaping that. I was assuming this technique was not available on Interix 
because unix specific /dev/* devices would not be available. I would appreciate 
it if you could patch the Interix port to use this technique and test how it 
works (load a JIT based program like HowToUseJIT.cpp in the examples directory).

Thanks,

Reid.

Henrik Bach wrote:
>> From: Reid Spencer <reid at x10sys.com>
>> Date: Thu, 16 Sep 2004 13:26:09 -0700
>>
>> Okay, so the question is, how do you do the equivalent of a MAP_ANON 
>> allocation on Interix. We don't want to map a file here. We're
just
>> asking for virtual memory (unbacked by swap or file) to be allocated 
>> to the process. Is there a way to do that on Interix? The 
>> corresponding way to do that in Win32 is with the VirtualAlloc 
>> function. Perhaps we need to use that directly? Is it available? Am I 
>> asking enough questions? :)
>>
> 
> U grill me with all those questions :)
> 
> No, we cannot use VirtualAlloc function directly.
> 
> Since you're only interested in allocating memory in page sizes
> 
> For convienience I provide you with a link to Interix migration/porting 
> pages:
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnucmg/html/ucmglp.asp
> 
> 
> Look in chapter 9, although it is very thin on the subject of memory 
> mapped files.
> 
> It's getting late for me. I'll try to look on the subject in the
weekend...
> 
> Henrik
> 
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> Få alle de nye og sjove ikoner med MSN Messenger http://messenger.msn.dk/
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