37 lines
974 B
C
37 lines
974 B
C
#include "../factor.h"
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BOUNDED_BLOCK *alloc_bounded_block(CELL size)
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{
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SYSTEM_INFO si;
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char *mem;
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DWORD ignore;
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GetSystemInfo(&si);
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mem = (char *)VirtualAlloc(NULL, si.dwPageSize*2 + size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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if(!mem)
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fatal_error("VirtualAlloc() failed in alloc_bounded_block()",0);
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if (!VirtualProtect(mem, si.dwPageSize, PAGE_NOACCESS, &ignore))
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fatal_error("Cannot allocate low guard page", (CELL)mem);
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if (!VirtualProtect(mem+size+si.dwPageSize, si.dwPageSize, PAGE_NOACCESS, &ignore))
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fatal_error("Cannot allocate high guard page", (CELL)mem);
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BOUNDED_BLOCK *retval = safe_malloc(sizeof(BOUNDED_BLOCK));
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retval->start = mem + si.dwPageSize;
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retval->size = size;
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return retval;
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}
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void dealloc_bounded_block(BOUNDED_BLOCK *block)
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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if(!VirtualFree(block->start - si.dwPageSize, si.dwPageSize*2 + block->size, MEM_DECOMMIT))
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fatal_error("VirtualFree() failed",0);
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free(block);
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}
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