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// +build windows
package memory
import (
"syscall"
"unsafe"
)
// omitting a few fields for brevity...
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa366589(v=vs.85).aspx
type memStatusEx struct {
dwLength uint32
dwMemoryLoad uint32
ullTotalPhys uint64
ullAvailPhys uint64
unused [5]uint64
}
func sysTotalMemory() uint64 {
kernel32, err := syscall.LoadDLL("kernel32.dll")
if err != nil {
return 0
}
// GetPhysicallyInstalledSystemMemory is simpler, but broken on
// older versions of windows (and uses this under the hood anyway).
globalMemoryStatusEx, err := kernel32.FindProc("GlobalMemoryStatusEx")
if err != nil {
return 0
}
msx := &memStatusEx{
dwLength: 64,
}
r, _, _ := globalMemoryStatusEx.Call(uintptr(unsafe.Pointer(msx)))
if r == 0 {
return 0
}
return msx.ullTotalPhys
}
func sysFreeMemory() uint64 {
kernel32, err := syscall.LoadDLL("kernel32.dll")
if err != nil {
return 0
}
// GetPhysicallyInstalledSystemMemory is simpler, but broken on
// older versions of windows (and uses this under the hood anyway).
globalMemoryStatusEx, err := kernel32.FindProc("GlobalMemoryStatusEx")
if err != nil {
return 0
}
msx := &memStatusEx{
dwLength: 64,
}
r, _, _ := globalMemoryStatusEx.Call(uintptr(unsafe.Pointer(msx)))
if r == 0 {
return 0
}
return msx.ullAvailPhys
}
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