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View Code? Open in Web Editor NEWArena Allocator implementation in C
Arena Allocator implementation in C
Line 23 in 44a2982
^^ In the code above, you call mprotect() with a size of (capacity * 2), but you are using the end of the buffer as the starting point. Thus, the read/writable region of memory becomes [dirty arena][2*capacity new pages], for a total of 3x as much space.
However, a few lines down you adjust capacity by x2, which means you "leak" some of the newly-mprotect()ed memory, since you tagged it but are ignoring it because of how capacity is adjusted.
(I think you are doing this thing in a straightforward way. If so, I think this is a bug. But I'm just a passer-by reading through your arena code, so I may be missing something.)
If you agree this is a bug, you could probably fix it by adding to the capacity, instead of multiplying it:
a->cap += a->cap * 2; // Where "2" is a macro I do not remember
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