Add sync feature flag

Cargo.toml

@@ -26,3 +26,4 @@ pkg-config = "0.3.3" #force a newer version for libudev-sys to fix minimal versi
 mio = ["mio10"] # mio feature defaults to the newest mio version
 hwdb = []
 send = []
+sync = []

src/device.rs

@@ -70,6 +70,8 @@ impl Drop for Device {
 
 #[cfg(feature = "send")]
 unsafe impl Send for Device {}
+#[cfg(feature = "sync")]
+unsafe impl Sync for Device {}
 
 as_ffi_with_context!(Device, device, ffi::udev_device, ffi::udev_device_ref);
 

src/enumerator.rs

@@ -35,6 +35,8 @@ impl Drop for Enumerator {
 
 #[cfg(feature = "send")]
 unsafe impl Send for Enumerator {}
+#[cfg(feature = "sync")]
+unsafe impl Sync for Enumerator {}
 
 as_ffi_with_context!(
     Enumerator,

src/hwdb.rs

@@ -32,6 +32,8 @@ impl Drop for Hwdb {
 
 #[cfg(feature = "send")]
 unsafe impl Send for Hwdb {}
+#[cfg(feature = "sync")]
+unsafe impl Sync for Hwdb {}
 
 as_ffi!(Hwdb, hwdb, ffi::udev_hwdb, ffi::udev_hwdb_ref);
 

src/list.rs

@@ -17,6 +17,8 @@ pub struct List<'a, T: 'a, E: 'a> {
 
 #[cfg(feature = "send")]
 unsafe impl<T, E> Send for List<'_, T, E> {}
+#[cfg(feature = "sync")]
+unsafe impl<T, E> Sync for List<'_, T, E> {}
 
 pub type EntryList<'a, T> = List<'a, T, Entry<'a>>;
 

src/monitor.rs

@@ -50,6 +50,8 @@ impl Drop for Builder {
 
 #[cfg(feature = "send")]
 unsafe impl Send for Builder {}
+#[cfg(feature = "sync")]
+unsafe impl Sync for Builder {}
 
 as_ffi_with_context!(Builder, monitor, ffi::udev_monitor, ffi::udev_monitor_ref);
 

src/udev.rs

@@ -33,6 +33,8 @@ impl Drop for Udev {
 
 #[cfg(feature = "send")]
 unsafe impl Send for Udev {}
+#[cfg(feature = "sync")]
+unsafe impl Sync for Udev {}
 
 as_ffi!(Udev, udev, ffi::udev, ffi::udev_ref);