// LockShared share locks an object. At the moment, lock duration cannot be specified so this locks the object
// indefinitely.
func (o *Object) LockShared(name, cookie, tag, description string, flags ...LibradosLock) error {
oid := C.CString(o.name)
defer freeString(oid)
n := C.CString(name)
defer freeString(n)
c := C.CString(cookie)
defer freeString(c)
t := C.CString(tag)
defer freeString(t)
d := C.CString(description)
defer freeString(d)
f := 0
for _, flag := range flags {
f |= int(flag)
}
ret := C.rados_lock_shared(o.ioContext, oid, n, c, t, d, nil, C.uint8_t(f))
switch int(ret) {
case -int(syscall.EBUSY):
err := toRadosError(ret)
err.Message = fmt.Sprintf("%s is already locked by another client", o.name)
return err
case -int(syscall.EEXIST):
err := toRadosError(ret)
err.Message = fmt.Sprintf("%s is already locked by current client", o.name)
return err
}
return nil
}
// Take a shared lock on an object.
func (ioctx *IOContext) LockShared(oid, name, cookie, tag, desc string, duration time.Duration, flags *byte) (int, error) {
c_oid := C.CString(oid)
c_name := C.CString(name)
c_cookie := C.CString(cookie)
c_tag := C.CString(tag)
c_desc := C.CString(desc)
var c_duration C.struct_timeval
if duration != 0 {
tv := syscall.NsecToTimeval(time.Now().Add(duration).UnixNano())
c_duration = C.struct_timeval{tv_sec: C.__time_t(tv.Sec), tv_usec: C.__suseconds_t(tv.Usec)}
}
var c_flags C.uint8_t
if flags != nil {
c_flags = C.uint8_t(*flags)
}
defer C.free(unsafe.Pointer(c_oid))
defer C.free(unsafe.Pointer(c_name))
defer C.free(unsafe.Pointer(c_cookie))
defer C.free(unsafe.Pointer(c_tag))
defer C.free(unsafe.Pointer(c_desc))
ret := C.rados_lock_shared(
ioctx.ioctx,
c_oid,
c_name,
c_cookie,
c_tag,
c_desc,
&c_duration,
c_flags)
// 0 on success, negative error code on failure
// -EBUSY if the lock is already held by another (client, cookie) pair
// -EEXIST if the lock is already held by the same (client, cookie) pair
switch ret {
case 0:
return int(ret), nil
case -16: // EBUSY
return int(ret), nil
case -17: // EEXIST
return int(ret), nil
default:
return int(ret), RadosError(int(ret))
}
}