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|
//go:build windows
// +build windows
package fqueue
import (
"syscall"
"unsafe"
)
var (
modkernel32 = syscall.NewLazyDLL("kernel32.dll")
procLockFileEx = modkernel32.NewProc("LockFileEx")
procUnlockFileEx = modkernel32.NewProc("UnlockFileEx")
)
func lock(fd int, wait bool) error {
handle := syscall.Handle(fd)
var flags uint32 = 0x00000002 // LOCKFILE_EXCLUSIVE_LOCK
if !wait {
flags |= 0x00000001 // LOCKFILE_FAIL_IMMEDIATELY
}
var overlapped syscall.Overlapped
r, _, err := procLockFileEx.Call(
uintptr(handle),
uintptr(flags),
0,
uintptr(^uint32(0)), // максимальное количество байт
uintptr(^uint32(0)),
uintptr(unsafe.Pointer(&overlapped)),
)
if r == 0 {
return err
}
return nil
}
func unlock(fd int) error {
handle := syscall.Handle(fd)
var overlapped syscall.Overlapped
r, _, err := procUnlockFileEx.Call(
uintptr(handle),
0,
uintptr(^uint32(0)),
uintptr(^uint32(0)),
uintptr(unsafe.Pointer(&overlapped)),
)
if r == 0 {
return err
}
return nil
}
|
