Custom Memory Allocator – Arma 2

Since Arma 2 Operation Arrowhead build 85869 (1.60 beta) it is possible to provide custom memory allocators for the game. The allocator is a dll placed in dll directory located next to the game executable.

The dll interface is as follows:

extern "C" {
  __declspec(dllexport) size_t __stdcall MemTotalCommitted();         // _MemTotalCommitted@0
  __declspec(dllexport) size_t __stdcall MemTotalReserved();          // _MemTotalReserved@0
  __declspec(dllexport) size_t __stdcall MemFlushCache(size_t size);  // _MemFlushCache@4
  __declspec(dllexport) void __stdcall MemFlushCacheAll();            // _MemFlushCacheAll@0
  __declspec(dllexport) size_t __stdcall MemSize(void *mem);          // _MemSize@4
  __declspec(dllexport) void *__stdcall MemAlloc(size_t size);        // _MemAlloc@4
  __declspec(dllexport) void __stdcall MemFree(void *mem);            // _MemFree@4
};

MemTotalCommitted()

Total memory committed by the allocator (should correspond to VirtualAlloc with MEM_COMMIT)

MemTotalReserved()

Total memory reserved by the allocator (should correspond to VirtualAlloc with MEM_RESERVE)