X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=tests%2Fregression%2Frcutorture.h;h=ead5b4082ca217e5064dcd350a06799dd4e0ccf6;hb=ce29b37132cef1c1c758e0862ac701e9bb756d29;hp=46a673767ebd4d8ccc02063621a13f783149bfe9;hpb=61c3fb603104bda9e67c0690c1964e61a770d045;p=urcu.git

diff --git a/tests/regression/rcutorture.h b/tests/regression/rcutorture.h
index 46a6737..ead5b40 100644
--- a/tests/regression/rcutorture.h
+++ b/tests/regression/rcutorture.h
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2008 Paul E. McKenney, IBM Corporation.
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 /*
  * rcutorture.h: simple user-level performance/stress test of RCU.
  *
@@ -43,22 +47,6 @@
  * line lists the number of readers observing progressively more stale
  * data.  A correct RCU implementation will have all but the first two
  * numbers non-zero.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Copyright (c) 2008 Paul E. McKenney, IBM Corporation.
  */
 
 /*
@@ -79,6 +67,12 @@ enum callrcu_type {
 	CALLRCU_PERTHREAD,
 };
 
+enum writer_state {
+	WRITER_STATE_SYNC_RCU,
+	WRITER_STATE_CALL_RCU,
+	WRITER_STATE_POLL_RCU,
+};
+
 static enum callrcu_type callrcu_type = CALLRCU_GLOBAL;
 
 long long n_reads = 0LL;
@@ -160,7 +154,7 @@ void *rcu_read_perf_test(void *arg)
 }
 
 static
-void *rcu_update_perf_test(void *arg)
+void *rcu_update_perf_test(void *arg __attribute__((unused)))
 {
 	long long n_updates_local = 0;
 
@@ -290,7 +284,7 @@ struct rcu_stress {
 	int mbtest;
 };
 
-struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0 } };
+struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0, 0 } };
 struct rcu_stress *rcu_stress_current;
 int rcu_stress_idx = 0;
 
@@ -300,7 +294,7 @@ DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count);
 int garbage = 0;
 
 static
-void *rcu_read_stress_test(void *arg)
+void *rcu_read_stress_test(void *arg __attribute__((unused)))
 {
 	int i;
 	int itercnt = 0;
@@ -344,7 +338,7 @@ static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER;
 
 static
-void rcu_update_stress_test_rcu(struct rcu_head *head)
+void rcu_update_stress_test_rcu(struct rcu_head *head __attribute__((unused)))
 {
 	int ret;
 
@@ -372,11 +366,28 @@ void rcu_update_stress_test_rcu(struct rcu_head *head)
 }
 
 static
-void *rcu_update_stress_test(void *arg)
+void advance_writer_state(enum writer_state *state)
+{
+	switch (*state) {
+	case WRITER_STATE_SYNC_RCU:
+		*state = WRITER_STATE_CALL_RCU;
+		break;
+	case WRITER_STATE_CALL_RCU:
+		*state = WRITER_STATE_POLL_RCU;
+		break;
+	case WRITER_STATE_POLL_RCU:
+		*state = WRITER_STATE_SYNC_RCU;
+		break;
+	}
+}
+
+static
+void *rcu_update_stress_test(void *arg __attribute__((unused)))
 {
 	int i;
 	struct rcu_stress *p;
 	struct rcu_head rh;
+	enum writer_state writer_state = WRITER_STATE_SYNC_RCU;
 
 	while (goflag == GOFLAG_INIT)
 		(void) poll(NULL, 0, 1);
@@ -394,9 +405,12 @@ void *rcu_update_stress_test(void *arg)
 		for (i = 0; i < RCU_STRESS_PIPE_LEN; i++)
 			if (i != rcu_stress_idx)
 				rcu_stress_array[i].pipe_count++;
-		if (n_updates & 0x1)
+		switch (writer_state) {
+		case WRITER_STATE_SYNC_RCU:
 			synchronize_rcu();
-		else {
+			break;
+		case WRITER_STATE_CALL_RCU:
+		{
 			int ret;
 
 			ret = pthread_mutex_lock(&call_rcu_test_mutex);
@@ -438,15 +452,29 @@ void *rcu_update_stress_test(void *arg)
 					strerror(errno));
 				abort();
 			}
+			break;
+		}
+		case WRITER_STATE_POLL_RCU:
+		{
+			struct urcu_gp_poll_state poll_state;
+
+			rcu_register_thread();
+			poll_state = start_poll_synchronize_rcu();
+			rcu_unregister_thread();
+			while (!poll_state_synchronize_rcu(poll_state))
+				(void) poll(NULL, 0, 1);	/* Wait for 1ms */
+			break;
+		}
 		}
 		n_updates++;
+		advance_writer_state(&writer_state);
 	}
 
 	return NULL;
 }
 
 static
-void *rcu_fake_update_stress_test(void *arg)
+void *rcu_fake_update_stress_test(void *arg __attribute__((unused)))
 {
 	if (callrcu_type == CALLRCU_PERTHREAD) {
 		struct call_rcu_data *crdp;
@@ -532,7 +560,10 @@ int stresstest(int nreaders)
  */
 
 static
-void usage(int argc, char *argv[])
+void usage(char *argv[]) __attribute__((__noreturn__));
+
+static
+void usage(char *argv[])
 {
 	diag("Usage: %s nreaders [ perf | rperf | uperf | stress ] [ stride ] [ callrcu_global | callrcu_percpu | callrcu_perthread ]\n", argv[0]);
 	exit(-1);
@@ -557,7 +588,7 @@ int main(int argc, char *argv[])
 		} else if (strcmp(callrcu_str, "callrcu_perthread") == 0) {
 			callrcu_type = CALLRCU_PERTHREAD;
 		} else {
-			usage(argc, argv);
+			usage(argv);
 			goto end;
 		}
 	}
@@ -587,7 +618,7 @@ int main(int argc, char *argv[])
 	if (argc > 1) {
 		if (strcmp(argv[1], "-h") == 0
 				|| strcmp(argv[1], "--help") == 0) {
-			usage(argc, argv);
+			usage(argv);
 			goto end;
 		}
 		nreaders = strtoul(argv[1], NULL, 0);
@@ -616,9 +647,9 @@ int main(int argc, char *argv[])
 				"stresstest readers: %d, stride: %d",
 				nreaders, cpustride);
 		else
-			usage(argc, argv);
+			usage(argv);
 	} else {
-		usage(argc, argv);
+		usage(argv);
 	}
 end:
 	return exit_status();