modernc.org/memory@v1.8.0/mmap_windows.go (about) 1 // Copyright 2017 The Memory Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package memory // import "modernc.org/memory" 6 7 import ( 8 "os" 9 "syscall" 10 ) 11 12 const ( 13 _MEM_COMMIT = 0x1000 14 _MEM_RESERVE = 0x2000 15 _MEM_DECOMMIT = 0x4000 16 _MEM_RELEASE = 0x8000 17 18 _PAGE_READWRITE = 0x0004 19 _PAGE_NOACCESS = 0x0001 20 ) 21 22 const pageSizeLog = 16 23 24 var ( 25 modkernel32 = syscall.NewLazyDLL("kernel32.dll") 26 osPageMask = osPageSize - 1 27 osPageSize = os.Getpagesize() 28 procVirtualAlloc = modkernel32.NewProc("VirtualAlloc") 29 procVirtualFree = modkernel32.NewProc("VirtualFree") 30 ) 31 32 // pageSize aligned. 33 func mmap(size int) (uintptr, int, error) { 34 size = roundup(size, pageSize) 35 addr, _, err := procVirtualAlloc.Call(0, uintptr(size), _MEM_COMMIT|_MEM_RESERVE, _PAGE_READWRITE) 36 if err.(syscall.Errno) != 0 || addr == 0 { 37 return addr, size, err 38 } 39 return addr, size, nil 40 } 41 42 func unmap(addr uintptr, size int) error { 43 r, _, err := procVirtualFree.Call(addr, 0, _MEM_RELEASE) 44 if r == 0 { 45 return err 46 } 47 48 return nil 49 }