/*
 * 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.
 */

//
// Implements SlowWorker, which runs a single task only in a background thread.

#include "pagespeed/kernel/thread/slow_worker.h"

#include "pagespeed/kernel/base/function.h"

namespace net_instaweb {

class ThreadSystem;

SlowWorker::SlowWorker(StringPiece thread_name, ThreadSystem* runtime)
    : Worker(thread_name, runtime) {
}

SlowWorker::~SlowWorker() {
}

void SlowWorker::RunIfNotBusy(Function* closure) {
  bool ok = QueueIfPermitted(closure);
  if (!ok) {
    closure->CallCancel();
  }
}

bool SlowWorker::IsPermitted(Function* closure) {
  return NumJobs() == 0;
}

}  // namespace net_instaweb
