make RingBuffer Send + Sync so that the FrameDecoder is Send + Sync

src/decoding/ringbuffer.rs

@@ -19,6 +19,11 @@ pub struct RingBuffer {
     tail: usize,
 }
 
+// SAFETY: RingBuffer does not hold any thread specific values -> it can be sent to another thread -> RingBuffer is Send
+unsafe impl Send for RingBuffer {}
+// SAFETY: Ringbuffer does not provide unsyncronized interior mutability which makes &RingBuffer Send -> RingBuffer is Sync
+unsafe impl Sync for RingBuffer {}
+
 impl RingBuffer {
     pub fn new() -> Self {
         RingBuffer {

src/tests/mod.rs

@@ -32,6 +32,18 @@ fn assure_error_impl() {
     let _err: &dyn std::error::Error = &FrameDecoderError::NotYetInitialized;
 }
 
+#[cfg(all(test, feature = "std"))]
+#[allow(dead_code)]
+fn assure_decoder_send_sync() {
+    // not a real test just there to throw an compiler error if FrameDecoder is Send + Sync
+
+    use crate::frame_decoder::FrameDecoder;
+    let decoder = FrameDecoder::new();
+    std::thread::spawn(move || {
+        drop(decoder);
+    });
+}
+
 #[test]
 fn skippable_frame() {
     use crate::frame;