Migrate standard library away from compare_and_swap

3 files changed, 8 insertions, 8 deletions

diff --git a/library/std/src/sys/sgx/abi/mod.rs b/library/std/src/sys/sgx/abi/mod.rs
index a0eb12c3d15..a5e45303476 100644
--- a/library/std/src/sys/sgx/abi/mod.rs
+++ b/library/std/src/sys/sgx/abi/mod.rs
@@ -36,20 +36,20 @@ unsafe extern "C" fn tcs_init(secondary: bool) {
     }
 
     // Try to atomically swap UNINIT with BUSY. The returned state can be:
-    match RELOC_STATE.compare_and_swap(UNINIT, BUSY, Ordering::Acquire) {
+    match RELOC_STATE.compare_exchange(UNINIT, BUSY, Ordering::Acquire, Ordering::Acquire) {
         // This thread just obtained the lock and other threads will observe BUSY
-        UNINIT => {
+        Ok(_) => {
             reloc::relocate_elf_rela();
             RELOC_STATE.store(DONE, Ordering::Release);
         }
         // We need to wait until the initialization is done.
-        BUSY => {
+        Err(BUSY) => {
             while RELOC_STATE.load(Ordering::Acquire) == BUSY {
                 core::hint::spin_loop();
             }
         }
         // Initialization is done.
-        DONE => {}
+        Err(DONE) => {}
         _ => unreachable!(),
     }
 }
diff --git a/library/std/src/sys/sgx/waitqueue/spin_mutex.rs b/library/std/src/sys/sgx/waitqueue/spin_mutex.rs
index d99ce895da5..9140041c584 100644
--- a/library/std/src/sys/sgx/waitqueue/spin_mutex.rs
+++ b/library/std/src/sys/sgx/waitqueue/spin_mutex.rs
@@ -42,7 +42,7 @@ impl<T> SpinMutex<T> {
 
     #[inline(always)]
     pub fn try_lock(&self) -> Option<SpinMutexGuard<'_, T>> {
-        if !self.lock.compare_and_swap(false, true, Ordering::Acquire) {
+        if self.lock.compare_exchange(false, true, Ordering::Acquire, Ordering::Acquire).is_ok() {
             Some(SpinMutexGuard { mutex: self })
         } else {
             None
diff --git a/library/std/src/sys/windows/mutex.rs b/library/std/src/sys/windows/mutex.rs
index fa51b006c34..d4cc56d4cb3 100644
--- a/library/std/src/sys/windows/mutex.rs
+++ b/library/std/src/sys/windows/mutex.rs
@@ -123,9 +123,9 @@ impl Mutex {
         let inner = box Inner { remutex: ReentrantMutex::uninitialized(), held: Cell::new(false) };
         inner.remutex.init();
         let inner = Box::into_raw(inner);
-        match self.lock.compare_and_swap(0, inner as usize, Ordering::SeqCst) {
-            0 => inner,
-            n => {
+        match self.lock.compare_exchange(0, inner as usize, Ordering::SeqCst, Ordering::SeqCst) {
+            Ok(_) => inner,
+            Err(n) => {
                 Box::from_raw(inner).remutex.destroy();
                 n as *const _
             }