Fix: tests/rcutorture: Put thread offline on busy-wait

[urcu.git] / tests / regression / rcutorture.h

diff --git a/tests/regression/rcutorture.h b/tests/regression/rcutorture.h
index bc394f9f8a048f9ba51575e3d9a1ac4952cf6bdb..f495cbd12259709721212a17b84a7e7744be905a 100644 (file)
--- 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.
  */
 
 /*
@@ -68,6 +56,8 @@
 #include <stdlib.h>
 #include "tap.h"
 
+#include "urcu-wait.h"
+
 #define NR_TESTS       1
 
 DEFINE_PER_THREAD(long long, n_reads_pt);
@@ -346,35 +336,15 @@ void *rcu_read_stress_test(void *arg __attribute__((unused)))
        return (NULL);
 }
 
-static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER;
+static DEFINE_URCU_WAIT_QUEUE(call_rcu_waiters);
 
 static
 void rcu_update_stress_test_rcu(struct rcu_head *head __attribute__((unused)))
 {
-       int ret;
+       struct urcu_waiters waiters;
 
-       ret = pthread_mutex_lock(&call_rcu_test_mutex);
-       if (ret) {
-               errno = ret;
-               diag("pthread_mutex_lock: %s",
-                       strerror(errno));
-               abort();
-       }
-       ret = pthread_cond_signal(&call_rcu_test_cond);
-       if (ret) {
-               errno = ret;
-               diag("pthread_cond_signal: %s",
-                       strerror(errno));
-               abort();
-       }
-       ret = pthread_mutex_unlock(&call_rcu_test_mutex);
-       if (ret) {
-               errno = ret;
-               diag("pthread_mutex_unlock: %s",
-                       strerror(errno));
-               abort();
-       }
+       urcu_move_waiters(&waiters, &call_rcu_waiters);
+       urcu_wake_all_waiters(&waiters);
 }
 
 static
@@ -401,8 +371,14 @@ void *rcu_update_stress_test(void *arg __attribute__((unused)))
        struct rcu_head rh;
        enum writer_state writer_state = WRITER_STATE_SYNC_RCU;
 
+       rcu_register_thread();
+
+       /* Offline for poll. */
+       put_thread_offline();
        while (goflag == GOFLAG_INIT)
                (void) poll(NULL, 0, 1);
+       put_thread_online();
+
        while (goflag == GOFLAG_RUN) {
                i = rcu_stress_idx + 1;
                if (i >= RCU_STRESS_PIPE_LEN)
@@ -423,58 +399,29 @@ void *rcu_update_stress_test(void *arg __attribute__((unused)))
                        break;
                case WRITER_STATE_CALL_RCU:
                {
-                       int ret;
-
-                       ret = pthread_mutex_lock(&call_rcu_test_mutex);
-                       if (ret) {
-                               errno = ret;
-                               diag("pthread_mutex_lock: %s",
-                                       strerror(errno));
-                               abort();
-                       }
-                       rcu_register_thread();
+                       DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
+
+                       urcu_wait_add(&call_rcu_waiters, &wait);
+
                        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) {
-                               errno = ret;
-                               diag("pthread_cond_signal: %s",
-                                       strerror(errno));
-                               abort();
-                       }
-                       ret = pthread_mutex_unlock(&call_rcu_test_mutex);
-                       if (ret) {
-                               errno = ret;
-                               diag("pthread_mutex_unlock: %s",
-                                       strerror(errno));
-                               abort();
-                       }
+
+                       /* Offline for busy-wait. */
+                       put_thread_offline();
+                       urcu_adaptative_busy_wait(&wait);
+                       put_thread_online();
                        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();
+
+                       /* Offline for poll. */
+                       put_thread_offline();
                        while (!poll_state_synchronize_rcu(poll_state))
                                (void) poll(NULL, 0, 1);        /* Wait for 1ms */
+                       put_thread_online();
                        break;
                }
                }
@@ -482,6 +429,8 @@ void *rcu_update_stress_test(void *arg __attribute__((unused)))
                advance_writer_state(&writer_state);
        }
 
+       rcu_unregister_thread();
+
        return NULL;
 }