Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

internal/gopsutil/mem/mem_windows.go

@@ -0,0 +1,99 @@
+//go:build windows
+
+package mem
+
+import (
+	"context"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/gofiber/fiber/v2/internal/gopsutil/common"
+)
+
+var (
+	procGlobalMemoryStatusEx = common.Modkernel32.NewProc("GlobalMemoryStatusEx")
+	procGetPerformanceInfo   = common.ModPsapi.NewProc("GetPerformanceInfo")
+)
+
+type memoryStatusEx struct {
+	cbSize                  uint32
+	dwMemoryLoad            uint32
+	ullTotalPhys            uint64 // in bytes
+	ullAvailPhys            uint64
+	ullTotalPageFile        uint64
+	ullAvailPageFile        uint64
+	ullTotalVirtual         uint64
+	ullAvailVirtual         uint64
+	ullAvailExtendedVirtual uint64
+}
+
+func VirtualMemory() (*VirtualMemoryStat, error) {
+	return VirtualMemoryWithContext(context.Background())
+}
+
+func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
+	var memInfo memoryStatusEx
+	memInfo.cbSize = uint32(unsafe.Sizeof(memInfo))
+	mem, _, _ := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&memInfo)))
+	if mem == 0 {
+		return nil, windows.GetLastError()
+	}
+
+	ret := &VirtualMemoryStat{
+		Total:       memInfo.ullTotalPhys,
+		Available:   memInfo.ullAvailPhys,
+		Free:        memInfo.ullAvailPhys,
+		UsedPercent: float64(memInfo.dwMemoryLoad),
+	}
+
+	ret.Used = ret.Total - ret.Available
+	return ret, nil
+}
+
+type performanceInformation struct {
+	cb                uint32
+	commitTotal       uint64
+	commitLimit       uint64
+	commitPeak        uint64
+	physicalTotal     uint64
+	physicalAvailable uint64
+	systemCache       uint64
+	kernelTotal       uint64
+	kernelPaged       uint64
+	kernelNonpaged    uint64
+	pageSize          uint64
+	handleCount       uint32
+	processCount      uint32
+	threadCount       uint32
+}
+
+func SwapMemory() (*SwapMemoryStat, error) {
+	return SwapMemoryWithContext(context.Background())
+}
+
+func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
+	var perfInfo performanceInformation
+	perfInfo.cb = uint32(unsafe.Sizeof(perfInfo))
+	mem, _, _ := procGetPerformanceInfo.Call(uintptr(unsafe.Pointer(&perfInfo)), uintptr(perfInfo.cb))
+	if mem == 0 {
+		return nil, windows.GetLastError()
+	}
+	tot := perfInfo.commitLimit * perfInfo.pageSize
+	used := perfInfo.commitTotal * perfInfo.pageSize
+	free := tot - used
+	var usedPercent float64
+	if tot == 0 {
+		usedPercent = 0
+	} else {
+		usedPercent = float64(used) / float64(tot) * 100
+	}
+	ret := &SwapMemoryStat{
+		Total:       tot,
+		Used:        used,
+		Free:        free,
+		UsedPercent: usedPercent,
+	}
+
+	return ret, nil
+}