get.pme.sh/pnats@v0.0.0-20240304004023-26bb5a137ed0/server/sysmem/mem_windows.go (about)

     1  // Copyright 2019 The NATS Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  //go:build windows
    15  // +build windows
    16  
    17  package sysmem
    18  
    19  import (
    20  	"syscall"
    21  	"unsafe"
    22  )
    23  
    24  // https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-memorystatusex
    25  type _memoryStatusEx struct {
    26  	dwLength     uint32
    27  	dwMemoryLoad uint32
    28  	ullTotalPhys uint64
    29  	unused       [6]uint64 // ignore rest of struct
    30  }
    31  
    32  func Memory() int64 {
    33  	kernel32, err := syscall.LoadDLL("kernel32.dll")
    34  	if err != nil {
    35  		return 0
    36  	}
    37  	globalMemoryStatusEx, err := kernel32.FindProc("GlobalMemoryStatusEx")
    38  	if err != nil {
    39  		return 0
    40  	}
    41  	msx := &_memoryStatusEx{dwLength: 64}
    42  	res, _, _ := globalMemoryStatusEx.Call(uintptr(unsafe.Pointer(msx)))
    43  	if res == 0 {
    44  		return 0
    45  	}
    46  	return int64(msx.ullTotalPhys)
    47  }