+void
+mono_mach_init (pthread_key_t key)
+{
+ void *old_value = pthread_getspecific (key);
+ void *canary = (void*)0xDEADBEEFu;
+
+ pthread_key_create (&key, NULL);
+ g_assert (old_value != canary);
+
+ pthread_setspecific (key, canary);
+
+ /*First we probe for cats*/
+ tls_vector_offset = TLS_VECTOR_OFFSET_CATS;
+ if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
+ goto ok;
+
+ tls_vector_offset = TLS_VECTOR_OFFSET_10_9;
+ if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
+ goto ok;
+
+ g_error ("could not discover the mach TLS offset");
+ok:
+ pthread_setspecific (key, old_value);
+}