X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=tests%2Fregression%2Frcutorture.h;h=9a2f9a1f581ffc5c34e4ce0c5f2ed2a12e114b75;hp=053653faca37a0b3be9f649c3cf7728da4c61400;hb=447c9339d4f21fe5bba1aa77eccc9f94745e6447;hpb=a13ef613168a4f5f35ca820750fedf13c403ce98

diff --git a/tests/regression/rcutorture.h b/tests/regression/rcutorture.h
index 053653f..9a2f9a1 100644
--- a/tests/regression/rcutorture.h
+++ b/tests/regression/rcutorture.h
@@ -113,13 +113,13 @@ volatile int goflag __attribute__((__aligned__(CAA_CACHE_LINE_SIZE)))
 #endif
 
 #ifndef mark_rcu_quiescent_state
-#define mark_rcu_quiescent_state() do ; while (0)
+#define mark_rcu_quiescent_state() do {} while (0)
 #endif /* #ifdef mark_rcu_quiescent_state */
 
 #ifndef put_thread_offline
-#define put_thread_offline()		do ; while (0)
-#define put_thread_online()		do ; while (0)
-#define put_thread_online_delay()	do ; while (0)
+#define put_thread_offline()		do {} while (0)
+#define put_thread_online()		do {} while (0)
+#define put_thread_online_delay()	do {} while (0)
 #else /* #ifndef put_thread_offline */
 #define put_thread_online_delay()	synchronize_rcu()
 #endif /* #else #ifndef put_thread_offline */
@@ -368,9 +368,6 @@ void *rcu_update_stress_test(void *arg)
 	struct rcu_stress *p;
 	struct rcu_head rh;
 
-	rcu_register_thread();
-	rcu_thread_offline();
-
 	while (goflag == GOFLAG_INIT)
 		(void) poll(NULL, 0, 1);
 	while (goflag == GOFLAG_RUN) {
@@ -399,7 +396,23 @@ void *rcu_update_stress_test(void *arg)
 					strerror(errno));
 				abort();
 			}
+			rcu_register_thread();
 			call_rcu(&rh, rcu_update_stress_test_rcu);
+			rcu_unregister_thread();
+			/*
+			 * Our MacOS X test machine with the following
+			 * config:
+			 * 15.6.0 Darwin Kernel Version 15.6.0
+			 * root:xnu-3248.60.10~1/RELEASE_X86_64
+			 * appears to have issues with liburcu-signal
+			 * signal being delivered on top of
+			 * pthread_cond_wait. It seems to make the
+			 * thread continue, and therefore corrupt the
+			 * rcu_head. Work around this issue by
+			 * unregistering the RCU read-side thread
+			 * immediately after call_rcu (call_rcu needs
+			 * us to be registered RCU readers).
+			 */
 			ret = pthread_cond_wait(&call_rcu_test_cond,
 					&call_rcu_test_mutex);
 			if (ret) {
@@ -419,8 +432,6 @@ void *rcu_update_stress_test(void *arg)
 		n_updates++;
 	}
 
-	rcu_thread_online();
-	rcu_unregister_thread();
 	return NULL;
 }