From 1e45930150b901fc1d975ae2781bdc4eb5ee987c Mon Sep 17 00:00:00 2001
From: widagdos <widagdos@gmail.com>
Date: Sat, 23 Mar 2024 00:09:28 -0700
Subject: Make BackupEngine Send

BackupEngine is a simple pointer wrapper, so it's safe to send to another thread since the underlying RocksDB backup engine is thread-safe.
---
 src/backup.rs        | 4 ++++
 tests/test_backup.rs | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/backup.rs b/src/backup.rs
index 17d0796..2ad37f9 100644
--- a/src/backup.rs
+++ b/src/backup.rs
@@ -48,6 +48,10 @@ pub struct RestoreOptions {
     inner: *mut ffi::rocksdb_restore_options_t,
 }
 
+// BackupEngine is a simple pointer wrapper, so it's safe to send to another thread
+// since the underlying RocksDB backup engine is thread-safe.
+unsafe impl Send for BackupEngine {}
+
 impl BackupEngine {
     /// Open a backup engine with the specified options and RocksDB Env.
     pub fn open(opts: &BackupEngineOptions, env: &Env) -> Result<Self, Error> {
diff --git a/tests/test_backup.rs b/tests/test_backup.rs
index b1dff2e..5109e52 100644
--- a/tests/test_backup.rs
+++ b/tests/test_backup.rs
@@ -107,3 +107,10 @@ fn restore_from_backup() {
         }
     }
 }
+
+fn assert_send_generic<T: Send>() {}
+
+#[test]
+fn assert_send() {
+    assert_send_generic::<BackupEngine>();
+}
-- 
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