12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- // 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 <gtest/gtest.h>
- #include <pthread.h>
- #include <sched.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <bthread/processor.h>
- namespace {
- volatile bool stop = false;
- void* spinner(void*) {
- long counter = 0;
- for (; !stop; ++counter) {
- cpu_relax();
- }
- printf("spinned %ld\n", counter);
- return NULL;
- }
- void* yielder(void*) {
- int counter = 0;
- for (; !stop; ++counter) {
- sched_yield();
- }
- printf("sched_yield %d\n", counter);
- return NULL;
- }
- TEST(SchedYieldTest, sched_yield_when_all_core_busy) {
- stop = false;
- const int kNumCores = sysconf(_SC_NPROCESSORS_ONLN);
- ASSERT_TRUE(kNumCores > 0);
- pthread_t th0;
- pthread_create(&th0, NULL, yielder, NULL);
-
- pthread_t th[kNumCores];
- for (int i = 0; i < kNumCores; ++i) {
- pthread_create(&th[i], NULL, spinner, NULL);
- }
- sleep(1);
- stop = true;
- for (int i = 0; i < kNumCores; ++i) {
- pthread_join(th[i], NULL);
- }
- pthread_join(th0, NULL);
- }
- } // namespace
|