core-framework/src/utils/StoppableThread.cpp

/**
 * 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 "utils/StoppableThread.h"
#include "minifi-cpp/utils/gsl.h"

namespace org::apache::nifi::minifi::utils {

static thread_local StoppableThread* current_thread;

StoppableThread::StoppableThread(std::function<void()> fn) {
  thread_ = std::thread{[fn = std::move(fn), this] {
    current_thread = this;
    fn();
  }};
}

bool StoppableThread::waitForStopRequest(std::chrono::milliseconds time) {
  gsl_Expects(current_thread);
  std::unique_lock lock(current_thread->mtx_);
  // wait_for returns false if the predicate is still false, i.e. the thread is running
  return current_thread->cv_.wait_for(lock, time, [&] {return !current_thread->running_;});
}

}  // namespace org::apache::nifi::minifi::utils