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What's the equivalent to Windows's VirtualAlloc in OS X? That is, how can i reserve a contiguous address space without actually commiting it and then commit chunks of it later?

Thanks,

Alex

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    AFAIK, there's no way to reserve memory as VirtualAlloc does. For contiguous allocation use mmap. Commented Aug 24, 2010 at 21:15
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    I have also seen mmap used for contiguous allocation on OS X and other Unices. Could a specialist point out the differences, if any, with Windows' VirtualAlloc? Perhaps someone who has answered that they weren't the same? (Note: the users of mmap I was referring to went back to malloc but I can't remember the reason) Commented Aug 25, 2010 at 7:23

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The mmap() function, called with MAP_ANON | MAP_PRIVATE, is very roughly equivalent to VirtualAlloc() with the MEM_RESERVE flag. Memory is then committed by touching each page in the mapping.

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No, unfortunately, there is no exact equivalent to VirtualAlloc.

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