Add loop to handle abort error like in suspend logic on Darwin

(a cherry-pick of commit 60d0e0b7d from Unity-Technologies/bdwgc)

* darwin_stop_world.c (GC_stack_range_for): Retry
thread_get_state(GC_MACH_THREAD_STATE) while KERN_ABORTED.

1 files changed, 6 insertions, 4 deletions

diff --git a/darwin_stop_world.c b/darwin_stop_world.c
index 2872bc03..3dbaa3fb 100644
--- a/darwin_stop_world.c
+++ b/darwin_stop_world.c
@@ -196,10 +196,12 @@ STATIC ptr_t GC_stack_range_for(ptr_t *phi, thread_act_t thread, GC_thread p,
     /* else */ {
       mach_msg_type_number_t thread_state_count = GC_MACH_THREAD_STATE_COUNT;
 
-      /* Get the thread state (registers, etc) */
-      kern_result = thread_get_state(thread, GC_MACH_THREAD_STATE,
-                                     (natural_t *)&state,
-                                     &thread_state_count);
+      /* Get the thread state (registers, etc.) */
+      do {
+        kern_result = thread_get_state(thread, GC_MACH_THREAD_STATE,
+                                       (natural_t *)&state,
+                                       &thread_state_count);
+      } while (kern_result == KERN_ABORTED);
     }
 #   ifdef DEBUG_THREADS
       GC_log_printf("thread_get_state returns value = %d\n", kern_result);