diff --git a/src/sync/pthread_mutex.rs b/src/sync/pthread_mutex.rs
index 2871a6149..3c8e73f15 100644
--- a/src/sync/pthread_mutex.rs
+++ b/src/sync/pthread_mutex.rs
@@ -35,7 +35,7 @@ const FUTEX_OWNER_DIED: u32 = 1 << 30;
 const INDEX_MASK: u32 = !(WAITING_BIT | FUTEX_OWNER_DIED);
 // TODO: Lower limit is probably better.
 const RECURSIVE_COUNT_MAX_INCLUSIVE: u32 = u32::MAX;
-const SPIN_COUNT: usize = 0;
+const SPIN_COUNT: usize = 100;

 impl RlctMutex {
     pub(crate) fn new(attr: &RlctMutexAttr) -> Result<Self, Errno> {
diff --git a/src/sync/barrier.rs b/src/sync/barrier.rs
index b5847b5..a8e3c2f0 100644
--- a/src/sync/barrier.rs
+++ b/src/sync/barrier.rs
@@ -47,6 +47,9 @@ impl Barrier {
             cvar: FutexState::new(count.get()),
         }
     }
+    pub fn destroy(&self) {}
+
     pub fn wait(&self) -> WaitResult {
         let _ = &self.lock;
         let sense = self.cvar.sense.load(Ordering::Acquire);
diff --git a/src/header/pthread/barrier.rs b/src/header/pthread/barrier.rs
index 1a5df3a..e69e2b9 100644
--- a/src/header/pthread/barrier.rs
+++ b/src/header/pthread/barrier.rs
@@ -24,10 +24,10 @@ pub(crate) struct RlctBarrierAttr {
 // Not async-signal-safe.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn pthread_barrier_destroy(barrier: *mut pthread_barrier_t) -> c_int {
-    // Behavior is undefined if any thread is currently waiting when this is called.
-
-    // No-op, currently.
-    unsafe { core::ptr::drop_in_place(barrier.cast::<RlctBarrier>()) };
+    let barrier = unsafe { &*barrier.cast::<RlctBarrier>() };
+    barrier.destroy();

     0
 }