From e30307713212a50aa6f58b18c725a16add90e532 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Wed, 17 Jun 2020 13:44:21 +0200
Subject: [PATCH] lru_cache: restrict and annotate Send impl

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
 src/tools/lru_cache.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tools/lru_cache.rs b/src/tools/lru_cache.rs
index 502f08f1..1033dd42 100644
--- a/src/tools/lru_cache.rs
+++ b/src/tools/lru_cache.rs
@@ -100,7 +100,8 @@ pub struct LruCache<K, V> {
     _marker: PhantomData<Box<CacheNode<K, V>>>,
 }
 
-unsafe impl<K, V> Send for LruCache<K, V> {}
+// trivial: if our contents are Send, the whole cache is Send
+unsafe impl<K: Send, V: Send> Send for LruCache<K, V> {}
 
 impl<K: std::cmp::Eq + std::hash::Hash + Copy, V> LruCache<K, V> {
     /// Create LRU cache instance which holds up to `capacity` nodes at once.