Relax `Arc` bounds don't require Sync+Send

Besides the above making sense, it'll also allow us to make `RacyCell`
private and use UnsafeCell instead.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/libstd/sys/unix/mutex.rs b/src/libstd/sys/unix/mutex.rs
index 3b0114b3e90..81f8659d6ae 100644
--- a/src/libstd/sys/unix/mutex.rs
+++ b/src/libstd/sys/unix/mutex.rs
@@ -8,13 +8,12 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use comm::RacyCell;
 use cell::UnsafeCell;
 use kinds::Sync;
 use sys::sync as ffi;
 use sys_common::mutex;
 
-pub struct Mutex { inner: RacyCell<ffi::pthread_mutex_t> }
+pub struct Mutex { inner: UnsafeCell<ffi::pthread_mutex_t> }
 
 #[inline]
 pub unsafe fn raw(m: &Mutex) -> *mut ffi::pthread_mutex_t {
@@ -22,7 +21,7 @@ pub unsafe fn raw(m: &Mutex) -> *mut ffi::pthread_mutex_t {
 }
 
 pub const MUTEX_INIT: Mutex = Mutex {
-    inner: RacyCell(UnsafeCell { value: ffi::PTHREAD_MUTEX_INITIALIZER }),
+    inner: UnsafeCell { value: ffi::PTHREAD_MUTEX_INITIALIZER },
 };
 
 unsafe impl Sync for Mutex {}