--- libmalloc/libmalloc-715.120.13/src/locking.h
+++ libmalloc/libmalloc-374.100.5/src/locking.h
@@ -24,129 +24,47 @@
 #ifndef __LOCKING_H
 #define __LOCKING_H
 
-typedef struct lock_exclaves_s {
-	// Must match liblibc/include/libc/std/pthread.h
-	uint32_t _Alignas(16) opaque[4];
-} lock_exclave;
-
-// Exclaves always uses pthread.h to avoid alignment difference with os/lock.h
-#if !MALLOC_TARGET_EXCLAVES && !MALLOC_TARGET_EXCLAVES_INTROSPECTOR && __has_include(<os/lock.h>)
-# define MALLOC_HAS_OS_LOCK 1
-# include <os/lock.h>
-# if __has_include(<os/lock_private.h>)
-#  include <os/lock_private.h>
-# endif // __has_include(<os/lock_private.h>)
-# if defined(OS_UNFAIR_LOCK_INLINE) && OS_UNFAIR_LOCK_INLINE
-#  define os_unfair_lock_lock_with_options(lock, options) \
+#if OS_UNFAIR_LOCK_INLINE
+#define os_unfair_lock_lock_with_options(lock, options) \
 		os_unfair_lock_lock_with_options_inline(lock, options)
-#  define os_unfair_lock_trylock(lock) \
+#define os_unfair_lock_trylock(lock) \
 		os_unfair_lock_trylock_inline(lock)
-#  define os_unfair_lock_unlock(lock) \
+#define os_unfair_lock_unlock(lock) \
 		os_unfair_lock_unlock_inline(lock)
-# endif // defined(OS_UNFAIR_LOCK_INLINE) && OS_UNFAIR_LOCK_INLINE
+#endif // OS_UNFAIR_LOCK_INLINE
 
 typedef os_unfair_lock _malloc_lock_s;
-# define _MALLOC_LOCK_INIT OS_UNFAIR_LOCK_INIT
-#elif __has_include(<pthread.h>)
-# define MALLOC_HAS_OS_LOCK 0
-# include <pthread.h>
-
-# if MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-typedef lock_exclave _malloc_lock_s;
-
-#  define _MALLOC_LOCK_INIT (lock_exclave){0}
-# else
-_Static_assert(sizeof(lock_exclave) == sizeof(pthread_mutex_t),
-	"lock_exclave size must match pthread_mutex_t on EC");
-_Static_assert(_Alignof(lock_exclave) == _Alignof(pthread_mutex_t),
-	"lock_exclave alignment must match pthread_mutex_t on EC");
-
-typedef pthread_mutex_t _malloc_lock_s;
-#  define _MALLOC_LOCK_INIT (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER
-# endif // MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-#else
-# error "No platform locking support!"
-#endif // __has_include(<os/lock.h>)
+#define _MALLOC_LOCK_INIT OS_UNFAIR_LOCK_INIT
 
 __attribute__((always_inline))
 static inline void
 _malloc_lock_init(_malloc_lock_s *lock) {
-#if !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-	*lock = _MALLOC_LOCK_INIT;
-#else
-	malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-			"exclaves lock not supported");
-#endif // !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+    *lock = OS_UNFAIR_LOCK_INIT;
 }
 
 MALLOC_ALWAYS_INLINE
 static inline void
 _malloc_lock_lock(_malloc_lock_s *lock) {
-#if !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-# if MALLOC_HAS_OS_LOCK
-#  if __has_include(<os/lock_private.h>)
 	return os_unfair_lock_lock_with_options(lock, OS_UNFAIR_LOCK_ADAPTIVE_SPIN |
-											OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION);
-#  else
-	return os_unfair_lock_lock(lock);
-#  endif // __has_include(<os/lock_private.h>)
-# else
-	if (pthread_mutex_lock(lock)) {
-		malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-				"Failed to acquire lock %p!\n", lock);
-	}
-# endif // MALLOC_HAS_OS_LOCK
-#else
-	malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-			"exclaves lock not supported");
-#endif // !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+			OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION);
 }
 
 MALLOC_ALWAYS_INLINE
 static inline bool
 _malloc_lock_trylock(_malloc_lock_s *lock) {
-#if !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-# if MALLOC_HAS_OS_LOCK
-	return os_unfair_lock_trylock(lock);
-# else
-    return !pthread_mutex_trylock(lock);
-# endif // MALLOC_HAS_OS_LOCK
-#else
-	malloc_zone_error(MALLOC_REPORT_CRASH, false,
-			"exclaves lock not supported");
-	return false;
-#endif // !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+    return os_unfair_lock_trylock(lock);
 }
 
 MALLOC_ALWAYS_INLINE
 static inline void
 _malloc_lock_unlock(_malloc_lock_s *lock) {
-#if !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-# if MALLOC_HAS_OS_LOCK
-	os_unfair_lock_unlock(lock);
-# else
-	if (pthread_mutex_unlock(lock)) {
-		malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-				"Failed to release lock %p!\n", lock);
-	}
-# endif // MALLOC_HAS_OS_LOCK
-#else
-	malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-			"exclaves lock not supported");
-#endif // !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
+    return os_unfair_lock_unlock(lock);
 }
 
 MALLOC_ALWAYS_INLINE
 static inline void
 _malloc_lock_assert_owner(_malloc_lock_s *lock) {
-#if !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
-# if MALLOC_HAS_OS_LOCK
 	os_unfair_lock_assert_owner(lock);
-# endif // MALLOC_HAS_OS_LOCK
-#else
-	malloc_zone_error(MALLOC_ABORT_ON_ERROR, false,
-			"exclaves lock not supported");
-#endif // !MALLOC_TARGET_EXCLAVES_INTROSPECTOR
 }
 
 #endif // __LOCKING_H