From b5c38ae40d7e9d3e05faef075f6ed173f55fe872 Mon Sep 17 00:00:00 2001
From: Dzmitry Malyshau <kvarkus@gmail.com>
Date: Thu, 4 Jun 2020 22:45:59 -0400
Subject: [PATCH] Prevent internal thread from cleanup

---
 wgpu-core/src/command/allocator.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/wgpu-core/src/command/allocator.rs b/wgpu-core/src/command/allocator.rs
index 1a2ce77adb..21c71cd61b 100644
--- a/wgpu-core/src/command/allocator.rs
+++ b/wgpu-core/src/command/allocator.rs
@@ -205,11 +205,11 @@ impl<B: hal::Backend> CommandAllocator<B> {
     pub fn maintain(&self, device: &B::Device, last_done_index: SubmissionIndex) {
         let mut inner = self.inner.lock();
         let mut remove_threads = Vec::new();
-        for (thread_id, pool) in inner.pools.iter_mut() {
+        for (&thread_id, pool) in inner.pools.iter_mut() {
             pool.maintain(last_done_index);
-            if pool.total == pool.available.len() {
+            if pool.total == pool.available.len() && thread_id != self.internal_thread_id {
                 assert!(pool.pending.is_empty());
-                remove_threads.push(*thread_id);
+                remove_threads.push(thread_id);
             }
         }
         for thread_id in remove_threads {