PawPaw/patches/glib/macos/02_aarch64-atomic-as-mutex.patch

--- glib-2.22.5/glib/gatomic.c	2021-01-12 00:34:17.000000000 +0000
+++ glib-2.22.5.mod/glib/gatomic.c	2021-01-12 00:31:22.000000000 +0000
@@ -561,55 +561,33 @@
 #    error "Your system has an unsupported pointer size"
 #  endif /* GLIB_SIZEOF_VOID_P */
 # elif defined (__aarch64__)
-static volatile int atomic_spin = 0;
-
-static int atomic_spin_trylock (void)
-{
-  int result;
-
-  asm volatile (
-    "swp %0, %1, [%2]\n"
-    : "=&r,&r" (result)
-    : "r,0" (1), "r,r" (&atomic_spin)
-    : "memory");
-  if (result == 0)
-    return 0;
-  else
-    return -1;
-}
-
-static void atomic_spin_lock (void)
-{
-  while (atomic_spin_trylock())
-    sched_yield();
-}
-
-static void atomic_spin_unlock (void)
-{
-  atomic_spin = 0;
-}
+#include <pthread.h>
+static pthread_mutex_t g_atomic_lock = PTHREAD_MUTEX_INITIALIZER;
 
 gint
 g_atomic_int_exchange_and_add (volatile gint G_GNUC_MAY_ALIAS *atomic, 
 			       gint           val)
 {
-  gint result;
- 
-  atomic_spin_lock();  
-  result = *atomic;
-  *atomic += val;
-  atomic_spin_unlock();
+  guint oldval;
 
-  return result;
+  pthread_mutex_lock (&g_atomic_lock);
+  oldval = *atomic;
+  *atomic = oldval & val;
+  pthread_mutex_unlock (&g_atomic_lock);
+
+  return oldval;
 }
 
 void
 g_atomic_int_add (volatile gint G_GNUC_MAY_ALIAS *atomic,
 		  gint           val)
 {
-  atomic_spin_lock();
-  *atomic += val;
-  atomic_spin_unlock();
+  guint oldval;
+
+  pthread_mutex_lock (&g_atomic_lock);
+  oldval = *atomic;
+  *atomic = oldval & val;
+  pthread_mutex_unlock (&g_atomic_lock);
 }
 
 gboolean
@@ -617,19 +595,16 @@
 				   gint           oldval, 
 				   gint           newval)
 {
-  gboolean result;
+  gboolean success;
 
-  atomic_spin_lock();
-  if (*atomic == oldval)
-    {
-      result = TRUE;
-      *atomic = newval;
-    }
-  else
-    result = FALSE;
-  atomic_spin_unlock();
+  pthread_mutex_lock (&g_atomic_lock);
 
-  return result;
+  if ((success = (*atomic == oldval)))
+    *atomic = newval;
+
+  pthread_mutex_unlock (&g_atomic_lock);
+
+  return success;
 }
 
 gboolean
@@ -637,19 +612,17 @@
 				       gpointer           oldval, 
 				       gpointer           newval)
 {
-  gboolean result;
- 
-  atomic_spin_lock();
-  if (*atomic == oldval)
-    {
-      result = TRUE;
-      *atomic = newval;
-    }
-  else
-    result = FALSE;
-  atomic_spin_unlock();
+  gpointer *ptr = atomic;
+  gboolean success;
 
-  return result;
+  pthread_mutex_lock (&g_atomic_lock);
+
+  if ((success = (*ptr == oldval)))
+    *ptr = newval;
+
+  pthread_mutex_unlock (&g_atomic_lock);
+
+  return success;
 }
 # elif defined (G_ATOMIC_CRIS) || defined (G_ATOMIC_CRISV32)
 #  ifdef G_ATOMIC_CRIS