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//go:build darwin
// +build darwin
package backend
import (
"syscall"
"golang.org/x/sys/unix"
)
const (
// Using default File.Sync function, same as fcntl(fd, F_FULLFSYNC)
DM_SYNC = 1
// Using syscall.Fsync function, for MacOS this is not safe but is very fast.
DM_FSYNC = 2
// Using fcntl with F_BARRIERFSYNC parameter, for more details please refer:
// https://developer.apple.com/documentation/xcode/reducing-disk-writes
DM_BFSYNC = 3
F_BARRIERFSYNC = 85
)
var (
// By default using F_BARRIERFSYNC
DarwinSyncMode = DM_BFSYNC
)
func (df *DiskFile) Sync() error {
switch DarwinSyncMode {
case DM_SYNC:
return df.File.Sync()
case DM_BFSYNC:
fd := df.File.Fd()
_, err := unix.FcntlInt(fd, F_BARRIERFSYNC, 0)
return err
default:
fd := df.File.Fd()
return syscall.Fsync(int(fd))
}
}
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