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