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https://github.com/openvswitch/ovs
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c67941e974
ovsrcu_barrier will block the current thread until all the postponed rcu job has been finished. it's like a OVS version of the Linux kernel rcu_barrier(). Signed-off-by: Peng He <hepeng.0320@bytedance.com> Co-authored-by: Eelco Chaudron <echaudro@redhat.com> Signed-off-by: Eelco Chaudron <echaudro@redhat.com> Reviewed-by: David Marchand <david.marchand@redhat.com> Acked-by: Eelco Chaudron <echaudro@redhat.com> Acked-by: Aaron Conole <aconole@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/*
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* Copyright (c) 2016 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#undef NDEBUG
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#include "fatal-signal.h"
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#include "ovs-rcu.h"
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#include "ovs-thread.h"
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#include "ovstest.h"
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#include "util.h"
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static void *
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quiescer_main(void *aux OVS_UNUSED)
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{
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/* A new thread must be not be quiescent */
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ovs_assert(!ovsrcu_is_quiescent());
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ovsrcu_quiesce_start();
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/* After the above call it must be quiescent */
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ovs_assert(ovsrcu_is_quiescent());
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return NULL;
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}
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static void
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test_rcu_quiesce(void)
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{
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pthread_t quiescer;
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quiescer = ovs_thread_create("quiescer", quiescer_main, NULL);
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/* This is the main thread of the process. After spawning its first
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* thread it must not be quiescent. */
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ovs_assert(!ovsrcu_is_quiescent());
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xpthread_join(quiescer, NULL);
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}
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static void
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add_count(void *_count)
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{
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unsigned *count = (unsigned *)_count;
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(*count) ++;
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}
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static void
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test_rcu_barrier(void)
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{
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unsigned count = 0;
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for (int i = 0; i < 10; i ++) {
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ovsrcu_postpone(add_count, &count);
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}
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ovsrcu_barrier();
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ovs_assert(count == 10);
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}
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static void
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test_rcu(int argc OVS_UNUSED, char *argv[] OVS_UNUSED) {
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test_rcu_quiesce();
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test_rcu_barrier();
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}
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OVSTEST_REGISTER("test-rcu", test_rcu);
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