Merge #480

480: Make the `queue` module available on no_std + alloc r=jeehoonkang a=phil-opp

The crossbeam_queue crate is no_std compatible since #455.

Co-authored-by: Philipp Oppermann <[email protected]>

Author: bors[bot]

Cargo.toml

@@ -29,7 +29,7 @@ std = [
   "crossbeam-queue",
   "crossbeam-utils/std",
 ]
-alloc = ["crossbeam-epoch/alloc", "crossbeam-utils/alloc"]
+alloc = ["crossbeam-epoch/alloc", "crossbeam-utils/alloc", "crossbeam-queue/alloc"]
 
 [dependencies]
 cfg-if = "0.1.2"

src/lib.rs

@@ -77,6 +77,16 @@ pub mod utils {
     pub use crossbeam_utils::CachePadded;
 }
 
+cfg_if! {
+    if #[cfg(any(feature = "std", feature = "alloc"))] {
+        mod _queue {
+            pub extern crate crossbeam_queue;
+        }
+        #[doc(inline)]
+        pub use _queue::crossbeam_queue as queue;
+    }
+}
+
 cfg_if! {
     if #[cfg(feature = "std")] {
         mod _deque {
@@ -96,12 +106,6 @@ cfg_if! {
         #[doc(hidden)]
         pub use _channel::*;
 
-        mod _queue {
-            pub extern crate crossbeam_queue;
-        }
-        #[doc(inline)]
-        pub use _queue::crossbeam_queue as queue;
-
         pub use crossbeam_utils::sync;
         pub use crossbeam_utils::thread;
         pub use crossbeam_utils::thread::scope;