[chore]: Bump github.com/KimMachineGun/automemlimit from 0.4.0 to 0.5.0 (#2560)

vendor/github.com/pbnjay/memory/memory_windows.go

@@ -0,0 +1,60 @@
+// +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
+}