From d7e87e460131b3b8405b602889088d1a34160817 Mon Sep 17 00:00:00 2001
From: c0gent <nsan1129@gmail.com>
Date: Thu, 4 Oct 2018 10:08:52 -0700
Subject: [PATCH] Add `Sync` req. on boxed rngs.

---
 src/coin.rs                                      | 4 ++--
 src/dynamic_honey_badger/dynamic_honey_badger.rs | 2 +-
 src/honey_badger/honey_badger.rs                 | 2 +-
 src/messaging.rs                                 | 2 +-
 src/util.rs                                      | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/coin.rs b/src/coin.rs
index 5dc92d4..8c0eb24 100644
--- a/src/coin.rs
+++ b/src/coin.rs
@@ -78,7 +78,7 @@ pub type Step<N, T> = messaging::Step<Coin<N, T>>;
 impl<N, T> DistAlgorithm for Coin<N, T>
 where
     N: NodeIdT,
-    T: Clone + AsRef<[u8]> + Send,
+    T: Clone + AsRef<[u8]> + Send + Sync,
 {
     type NodeId = N;
     type Input = ();
@@ -123,7 +123,7 @@ where
 impl<N, T> Coin<N, T>
 where
     N: NodeIdT,
-    T: Clone + AsRef<[u8]> + Send,
+    T: Clone + AsRef<[u8]> + Send + Sync,
 {
     pub fn new(netinfo: Arc<NetworkInfo<N>>, nonce: T) -> Self {
         Coin {
diff --git a/src/dynamic_honey_badger/dynamic_honey_badger.rs b/src/dynamic_honey_badger/dynamic_honey_badger.rs
index abbf67f..9151dad 100644
--- a/src/dynamic_honey_badger/dynamic_honey_badger.rs
+++ b/src/dynamic_honey_badger/dynamic_honey_badger.rs
@@ -39,7 +39,7 @@ pub struct DynamicHoneyBadger<C, N: Rand> {
     pub(super) incoming_queue: Vec<(N, Message<N>)>,
     /// A random number generator used for secret key generation.
     // Boxed to avoid overloading the algorithm's type with more generics.
-    pub(super) rng: Box<dyn rand::Rng + Send>,
+    pub(super) rng: Box<dyn rand::Rng + Send + Sync>,
 }
 
 impl<C, N> fmt::Debug for DynamicHoneyBadger<C, N>
diff --git a/src/honey_badger/honey_badger.rs b/src/honey_badger/honey_badger.rs
index 02fa3f7..ff237af 100644
--- a/src/honey_badger/honey_badger.rs
+++ b/src/honey_badger/honey_badger.rs
@@ -32,7 +32,7 @@ pub struct HoneyBadger<C, N: Rand> {
     pub(super) remote_epochs: BTreeMap<N, u64>,
     /// A random number generator used for secret key generation.
     // Boxed to avoid overloading the algorithm's type with more generics.
-    pub(super) rng: Box<dyn Rng + Send>,
+    pub(super) rng: Box<dyn Rng + Send + Sync>,
     /// Represents the optimization strategy to use for output of the `Subset` algorithm.
     pub(super) subset_handling_strategy: SubsetHandlingStrategy,
 }
diff --git a/src/messaging.rs b/src/messaging.rs
index cbe1bc1..562ccfa 100644
--- a/src/messaging.rs
+++ b/src/messaging.rs
@@ -185,7 +185,7 @@ impl<D: DistAlgorithm> From<TargetedMessage<D::Message, D::NodeId>> for Step<D>
 }
 
 /// A distributed algorithm that defines a message flow.
-pub trait DistAlgorithm: Send {
+pub trait DistAlgorithm: Send + Sync {
     /// Unique node identifier.
     type NodeId: NodeIdT;
     /// The input provided by the user.
diff --git a/src/util.rs b/src/util.rs
index d42539c..c038376 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -7,14 +7,14 @@ use rand;
 
 /// Workaround trait for creating new random number generators
 pub trait SubRng {
-    fn sub_rng(&mut self) -> Box<dyn rand::Rng + Send>;
+    fn sub_rng(&mut self) -> Box<dyn rand::Rng + Send + Sync>;
 }
 
 impl<R> SubRng for R
 where
     R: rand::Rng,
 {
-    fn sub_rng(&mut self) -> Box<dyn rand::Rng + Send> {
+    fn sub_rng(&mut self) -> Box<dyn rand::Rng + Send + Sync> {
         // Currently hard-coded to be an `Isaac64Rng`, until better options emerge. This is either
         // dependant on `rand` 0.5 support or an API re-design of parts of `threshold_crypto` and
         // `hbbft`.