Lumenarium/src_v2/platform/win32/lumenarium_win32_memory.cpp

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#define WIN32_PAGE_SIZE KB(4)
u64 platform_page_size() { return WIN32_PAGE_SIZE; }
u8*
platform_mem_reserve(u64 size)
{
size_t size_cvt = (size_t)round_size_to_page_multiple(size);
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DWORD alloc_type = MEM_RESERVE;
DWORD protection = PAGE_READWRITE;
u8* result = (u8*)VirtualAlloc(0, size_cvt, alloc_type, protection);
if (!result) win32_get_last_error();
return result;
}
u8*
platform_mem_commit(u8* base, u64 size)
{
size_t size_cvt = (size_t)round_size_to_page_multiple(size);
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DWORD alloc_type = MEM_COMMIT;
DWORD protection = PAGE_READWRITE;
u8* result = (u8*)VirtualAlloc(base, size_cvt, alloc_type, protection);
if (!result) win32_get_last_error();
return result;
}
bool
platform_mem_decommit(u8* base, u64 size)
{
DWORD free_type = MEM_DECOMMIT;
bool result = VirtualFree(base, (size_t)size, free_type);
if (!result) win32_get_last_error();
return result;
}
bool
platform_mem_release(u8* base, u64 size)
{
DWORD free_type = MEM_RELEASE;
// according to the docs, if we're releasing memory, the size must be
// zero as its implied VirtualFree will free the entire region
bool result = VirtualFree(base, 0, free_type);
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if (!result) win32_get_last_error();
return result;
}