utils: Move atomic module behind atomic feature

Cargo.toml

@@ -38,7 +38,7 @@ crossbeam-channel = { version = "0.5.10", path = "crossbeam-channel", default-fe
 crossbeam-deque = { version = "0.8.4", path = "crossbeam-deque", default-features = false, optional = true }
 crossbeam-epoch = { version = "0.9.17", path = "crossbeam-epoch", default-features = false, optional = true }
 crossbeam-queue = { version = "0.3.10", path = "crossbeam-queue", default-features = false, optional = true }
-crossbeam-utils = { version = "0.8.18", path = "crossbeam-utils", default-features = false }
+crossbeam-utils = { version = "0.8.18", path = "crossbeam-utils", default-features = false, features = ["atomic"] }
 
 [dev-dependencies]
 rand = "0.8"

crossbeam-channel/Cargo.toml

@@ -24,7 +24,7 @@ default = ["std"]
 std = ["crossbeam-utils/std"]
 
 [dependencies]
-crossbeam-utils = { version = "0.8.18", path = "../crossbeam-utils", default-features = false }
+crossbeam-utils = { version = "0.8.18", path = "../crossbeam-utils", default-features = false, features = ["atomic"] }
 
 [dev-dependencies]
 num_cpus = "1.13.0"

crossbeam-epoch/Cargo.toml

@@ -34,7 +34,7 @@ alloc = []
 loom = ["loom-crate", "crossbeam-utils/loom"]
 
 [dependencies]
-crossbeam-utils = { version = "0.8.18", path = "../crossbeam-utils", default-features = false }
+crossbeam-utils = { version = "0.8.18", path = "../crossbeam-utils", default-features = false, features = ["atomic"] }
 
 # Enable the use of loom for concurrency testing.
 #

crossbeam-epoch/src/lib.rs

@@ -116,11 +116,7 @@ mod primitive {
         }
     }
     pub(crate) mod sync {
-        pub(crate) mod atomic {
-            pub(crate) use core::sync::atomic::{
-                compiler_fence, fence, AtomicPtr, AtomicUsize, Ordering,
-            };
-        }
+        pub(crate) use core::sync::atomic;
         #[cfg(feature = "alloc")]
         pub(crate) use alloc::sync::Arc;
     }

crossbeam-utils/Cargo.toml

@@ -14,13 +14,19 @@ description = "Utilities for concurrent programming"
 keywords = ["scoped", "thread", "atomic", "cache"]
 categories = ["algorithms", "concurrency", "data-structures", "no-std"]
 
+[package.metadata.docs.rs]
+all-features = true
+
 [features]
 default = ["std"]
 
 # Enable to use APIs that require `std`.
 # This is enabled by default.
 std = []
 
+# Enable `atomic` module.
+atomic = []
+
 [dependencies]
 
 # Enable the use of loom for concurrency testing.

crossbeam-utils/src/lib.rs

@@ -33,6 +33,7 @@
     )
 ))]
 #![warn(missing_docs, unsafe_op_in_unsafe_fn)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(feature = "std")]
 extern crate std;
@@ -67,28 +68,14 @@ mod primitive {
         pub(crate) use core::hint::spin_loop;
     }
     pub(crate) mod sync {
-        pub(crate) mod atomic {
-            pub(crate) use core::sync::atomic::{compiler_fence, Ordering};
-            #[cfg(not(crossbeam_no_atomic))]
-            pub(crate) use core::sync::atomic::{
-                AtomicBool, AtomicI16, AtomicI8, AtomicIsize, AtomicU16, AtomicU8, AtomicUsize,
-            };
-            #[cfg(not(crossbeam_no_atomic))]
-            #[cfg(any(target_has_atomic = "32", not(target_pointer_width = "16")))]
-            pub(crate) use core::sync::atomic::{AtomicI32, AtomicU32};
-            #[cfg(not(crossbeam_no_atomic))]
-            #[cfg(any(
-                target_has_atomic = "64",
-                not(any(target_pointer_width = "16", target_pointer_width = "32")),
-            ))]
-            pub(crate) use core::sync::atomic::{AtomicI64, AtomicU64};
-        }
-
+        pub(crate) use core::sync::atomic;
         #[cfg(feature = "std")]
         pub(crate) use std::sync::{Arc, Condvar, Mutex};
     }
 }
 
+#[cfg(feature = "atomic")]
+#[cfg_attr(docsrs, doc(cfg(feature = "atomic")))]
 pub mod atomic;
 
 mod cache_padded;