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83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
// thread_pool.h
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/* Copyright 2009 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <boost/function.hpp>
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#include <boost/bind.hpp>
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#undef assert
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#define assert xassert
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namespace mongo {
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namespace threadpool {
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class Worker;
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typedef boost::function<void(void)> Task; //nullary function or functor
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// exported to the mongo namespace
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class ThreadPool : boost::noncopyable{
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public:
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explicit ThreadPool(int nThreads=8);
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// blocks until all tasks are complete (tasks_remaining() == 0)
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// You should not call schedule while in the destructor
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~ThreadPool();
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// blocks until all tasks are complete (tasks_remaining() == 0)
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// does not prevent new tasks from being scheduled so could wait forever.
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// Also, new tasks could be scheduled after this returns.
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void join();
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// task will be copied a few times so make sure it's relatively cheap
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void schedule(Task task);
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// Helpers that wrap schedule and boost::bind.
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// Functor and args will be copied a few times so make sure it's relatively cheap
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template<typename F, typename A>
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void schedule(F f, A a){ schedule(boost::bind(f,a)); }
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template<typename F, typename A, typename B>
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void schedule(F f, A a, B b){ schedule(boost::bind(f,a,b)); }
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template<typename F, typename A, typename B, typename C>
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void schedule(F f, A a, B b, C c){ schedule(boost::bind(f,a,b,c)); }
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template<typename F, typename A, typename B, typename C, typename D>
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void schedule(F f, A a, B b, C c, D d){ schedule(boost::bind(f,a,b,c,d)); }
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template<typename F, typename A, typename B, typename C, typename D, typename E>
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void schedule(F f, A a, B b, C c, D d, E e){ schedule(boost::bind(f,a,b,c,d,e)); }
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int tasks_remaining() { return _tasksRemaining; }
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private:
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mongo::mutex _mutex;
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boost::condition _condition;
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list<Worker*> _freeWorkers; //used as LIFO stack (always front)
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list<Task> _tasks; //used as FIFO queue (push_back, pop_front)
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int _tasksRemaining; // in queue + currently processing
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int _nThreads; // only used for sanity checking. could be removed in the future.
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// should only be called by a worker from the worker's thread
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void task_done(Worker* worker);
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friend class Worker;
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};
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} //namespace threadpool
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using threadpool::ThreadPool;
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} //namespace mongo
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