Poco::ThreadPool提供线程池功能,减少线程的创建和销毁所带来的开销,适合在服务器上应用。创建线程池时指定最少运行线程数和线程池的最大容量,若不指定则采用默认值,取2和16 。线程池的实现机制:有一部分线程始终处于运行状态,但阻塞在Event的wait调用上,所以处于休眠状态,开销并不大。如果我们需要一个线程来运行一段代码(在Poco中,用Runnable的子类表示一个target),则从线程池中去除一个线程,并将这段代码赋给它,并触发Event。然后线程就继续运行了。
活动图
demo
void ThreadPoolTest::testThreadPool() { ThreadPool pool(2, 3, 3); assert (pool.allocated() == 2); assert (pool.used() == 0); assert (pool.capacity() == 3); assert (pool.available() == 3); pool.addCapacity(1); assert (pool.allocated() == 2); assert (pool.used() == 0); assert (pool.capacity() == 4); assert (pool.available() == 4); RunnableAdapter<ThreadPoolTest> ra(*this, &ThreadPoolTest::hello); pool.start(ra); assert (pool.allocated() == 2); assert (pool.used() == 1); assert (pool.capacity() == 4); assert (pool.available() == 3); pool.start(ra); assert (pool.allocated() == 2); assert (pool.used() == 2); assert (pool.capacity() == 4); assert (pool.available() == 2); pool.start(ra); assert (pool.allocated() == 3); assert (pool.used() == 3); assert (pool.capacity() == 4); assert (pool.available() == 1); pool.start(ra); assert (pool.allocated() == 4); assert (pool.used() == 4); assert (pool.capacity() == 4); assert (pool.available() == 0); }线程池的内存策略有点像MemoryPool,请参加 http://blog.csdn.net/fym0121/article/details/7840801
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