80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <signal.h>
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#include <gtest/gtest.h>
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#include "butil/time.h"
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#include "butil/macros.h"
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namespace {
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void* read_thread(void* arg) {
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const size_t N = 10000;
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#ifdef CHECK_RWLOCK
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pthread_rwlock_t* lock = (pthread_rwlock_t*)arg;
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#else
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pthread_mutex_t* lock = (pthread_mutex_t*)arg;
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#endif
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const long t1 = butil::cpuwide_time_ns();
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for (size_t i = 0; i < N; ++i) {
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#ifdef CHECK_RWLOCK
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pthread_rwlock_rdlock(lock);
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pthread_rwlock_unlock(lock);
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#else
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pthread_mutex_lock(lock);
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pthread_mutex_unlock(lock);
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#endif
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}
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const long t2 = butil::cpuwide_time_ns();
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return new long((t2 - t1)/N);
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}
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void* write_thread(void*) {
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return NULL;
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}
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TEST(RWLockTest, rdlock_performance) {
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#ifdef CHECK_RWLOCK
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pthread_rwlock_t lock1;
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ASSERT_EQ(0, pthread_rwlock_init(&lock1, NULL));
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#else
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pthread_mutex_t lock1;
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ASSERT_EQ(0, pthread_mutex_init(&lock1, NULL));
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#endif
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pthread_t rth[16];
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pthread_t wth;
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for (size_t i = 0; i < ARRAY_SIZE(rth); ++i) {
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ASSERT_EQ(0, pthread_create(&rth[i], NULL, read_thread, &lock1));
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}
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ASSERT_EQ(0, pthread_create(&wth, NULL, write_thread, &lock1));
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for (size_t i = 0; i < ARRAY_SIZE(rth); ++i) {
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long* res = NULL;
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pthread_join(rth[i], (void**)&res);
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printf("read thread %lu = %ldns\n", i, *res);
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}
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pthread_join(wth, NULL);
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#ifdef CHECK_RWLOCK
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pthread_rwlock_destroy(&lock1);
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#else
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pthread_mutex_destroy(&lock1);
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#endif
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}
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} // namespace
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