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// Copyright 2017 The Memory Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package memory // import "modernc.org/memory"
import (
"os"
"syscall"
)
const (
_MEM_COMMIT = 0x1000
_MEM_RESERVE = 0x2000
_MEM_DECOMMIT = 0x4000
_MEM_RELEASE = 0x8000
_PAGE_READWRITE = 0x0004
_PAGE_NOACCESS = 0x0001
)
const pageSizeLog = 16
var (
modkernel32 = syscall.NewLazyDLL("kernel32.dll")
osPageMask = osPageSize - 1
osPageSize = os.Getpagesize()
procVirtualAlloc = modkernel32.NewProc("VirtualAlloc")
procVirtualFree = modkernel32.NewProc("VirtualFree")
)
// pageSize aligned.
func mmap(size int) (uintptr, int, error) {
size = roundup(size, pageSize)
addr, _, err := procVirtualAlloc.Call(0, uintptr(size), _MEM_COMMIT|_MEM_RESERVE, _PAGE_READWRITE)
if err.(syscall.Errno) != 0 || addr == 0 {
return addr, size, err
}
return addr, size, nil
}
func unmap(addr uintptr, size int) error {
r, _, err := procVirtualFree.Call(addr, 0, _MEM_RELEASE)
if r == 0 {
return err
}
return nil
}
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