--- libmalloc/libmalloc-283.100.5/src/internal.h
+++ libmalloc/libmalloc-374.40.6/src/internal.h
@@ -24,11 +24,10 @@
 #ifndef __INTERNAL_H
 #define __INTERNAL_H
 
-#define __OS_EXPOSE_INTERNALS__ 1
-
 // Toggles for fixes for specific Radars. If we get enough of these, we
 // probably should create a separate header file for them.
 #define RDAR_48993662 1
+#define OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY 1
 
 #include <Availability.h>
 #include <TargetConditionals.h>
@@ -57,12 +56,20 @@
 #include <mach/vm_page_size.h>
 #include <mach/vm_param.h>
 #include <mach/vm_statistics.h>
-#include <os/internal/internal_shared.h>
+#include <machine/cpu_capabilities.h>
+#include <os/atomic_private.h>
+#include <os/crashlog_private.h>
 #include <os/lock_private.h>
 #include <os/once_private.h>
 #include <os/overflow.h>
+#if !TARGET_OS_DRIVERKIT
+# include <os/feature_private.h>
+#endif
 #include <os/tsd.h>
 #include <paths.h>
+#include <pthread/pthread.h>  // _pthread_threadid_self_np_direct()
+#include <pthread/private.h>  // _pthread_threadid_self_np_direct()
+#include <pthread/tsd_private.h>  // TSD keys
 #include <signal.h>
 #include <stdarg.h>
 #include <stdbool.h>
@@ -96,8 +103,9 @@
 #include "magazine_malloc.h"
 #include "malloc_common.h"
 #include "nano_malloc_common.h"
-#include "nano_malloc.h"
 #include "nanov2_malloc.h"
+#include "pgm_malloc.h"
+#include "quarantine_malloc.h"
 #include "purgeable_malloc.h"
 #include "malloc_private.h"
 #include "thresholds.h"
@@ -109,13 +117,23 @@
 #include "nanov2_zone.h"
 #include "magazine_inline.h"
 #include "stack_logging.h"
+#include "stack_trace.h"
 #include "malloc_implementation.h"
 
 MALLOC_NOEXPORT
-extern boolean_t malloc_tracing_enabled;
+extern bool malloc_tracing_enabled;
 
 MALLOC_NOEXPORT
 extern unsigned malloc_debug_flags;
+
+MALLOC_NOEXPORT
+extern bool malloc_space_efficient_enabled;
+
+MALLOC_NOEXPORT
+extern bool malloc_medium_space_efficient_enabled;
+
+MALLOC_NOEXPORT
+extern bool malloc_quarantine_enabled;
 
 MALLOC_NOEXPORT MALLOC_NOINLINE
 void
@@ -124,6 +142,25 @@
 MALLOC_NOEXPORT MALLOC_NOINLINE MALLOC_USED
 int
 malloc_gdb_po_unsafe(void);
+
+MALLOC_NOEXPORT __attribute__((always_inline, const))
+static inline bool
+malloc_traced(void)
+{
+	return malloc_tracing_enabled;
+}
+
+static inline uint32_t
+_malloc_cpu_number(void)
+{
+#if TARGET_OS_SIMULATOR
+	size_t n;
+	pthread_cpu_number_np(&n);
+	return (uint32_t)n;
+#else
+	return _os_cpu_number();
+#endif
+}
 
 /*
   * Copies the malloc library's _malloc_msl_lite_hooks_t structure to a given
@@ -137,4 +174,12 @@
 void set_msl_lite_hooks(set_msl_lite_hooks_callout_t callout);
 
 
+// pthread reserves 5 TSD keys for libmalloc
+#define __TSD_MALLOC_PROB_GUARD_SAMPLE_COUNTER __PTK_LIBMALLOC_KEY0
+#define __TSD_MALLOC_UNUSED1                   __PTK_LIBMALLOC_KEY1
+#define __TSD_MALLOC_UNUSED2                   __PTK_LIBMALLOC_KEY2
+#define __TSD_MALLOC_UNUSED3                   __PTK_LIBMALLOC_KEY3
+#define __TSD_MALLOC_UNUSED4                   __PTK_LIBMALLOC_KEY4
+
+
 #endif // __INTERNAL_H