boost asio 学习(五) 错误处理
http://www.gamedev.net/blog/950/entry-2249317-a-guide-to-getting-started-with-boostasio?pg=6
5. Error handling
接下来我们需要注意的话题是错误处理。换句话说就是函数抛出异常时发生了什么
Boost::asio 给予用户两种选择来处理。错误通过handler传播,指出线程呼叫run或者poll系列函数的位置。用户可以能处理通过异常抛出的状态或者是接收返回的错误变量。更多关于BOOST的信息,可以参考boost 的错误与异常处理。
首先我们看看异常处理错误的方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #include <boost/asio.hpp> #include <boost/shared_ptr.hpp> #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/bind.hpp> #include <iostream> boost::mutex global_stream_lock; void WorkerThread( boost::shared_ptr< boost::asio::io_service > io_service ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Start" << std::endl; global_stream_lock.unlock(); try { io_service->run(); } catch ( std::exception & ex ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Exception: " << ex.what() << std::endl; global_stream_lock.unlock(); } global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Finish" << std::endl; global_stream_lock.unlock(); } void RaiseAnException( boost::shared_ptr< boost::asio::io_service > io_service ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] " << __FUNCTION__ << std::endl; global_stream_lock.unlock(); io_service->post( boost::bind( &RaiseAnException, io_service ) ); throw ( std::runtime_error( "Oops!" ) ); } int main( int argc, char * argv[] ) { boost::shared_ptr< boost::asio::io_service > io_service( new boost::asio::io_service ); boost::shared_ptr< boost::asio::io_service::work > work( new boost::asio::io_service::work( *io_service ) ); global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] The program will exit when all work has finished." << std::endl; global_stream_lock.unlock(); boost::thread_group worker_threads; for ( int x = 0; x < 2; ++x ) { worker_threads.create_thread( boost::bind( &WorkerThread, io_service ) ); } io_service->post( boost::bind( &RaiseAnException, io_service ) ); worker_threads.join_all(); return 0; } |
这个例子里,因为异常通过run函数释放,work线程因此退出。所有线程退出后,程序由于join_all的返回而结束。
下面看看使用错误变量返回异常的例子
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | #include <boost/asio.hpp> #include <boost/shared_ptr.hpp> #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/bind.hpp> #include <iostream> boost::mutex global_stream_lock; void WorkerThread( boost::shared_ptr< boost::asio::io_service > io_service ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Start" << std::endl; global_stream_lock.unlock(); boost::system::error_code ec; io_service->run( ec ); if ( ec ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Exception: " << ec << std::endl; global_stream_lock.unlock(); } global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Finish" << std::endl; global_stream_lock.unlock(); } void RaiseAnException( boost::shared_ptr< boost::asio::io_service > io_service ) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] " << __FUNCTION__ << std::endl; global_stream_lock.unlock(); io_service->post( boost::bind( &RaiseAnException, io_service ) ); throw ( std::runtime_error( "Oops!" ) ); } int main( int argc, char * argv[] ) { boost::shared_ptr< boost::asio::io_service > io_service( new boost::asio::io_service ); boost::shared_ptr< boost::asio::io_service::work > work( new boost::asio::io_service::work( *io_service ) ); global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] The program will exit when all work has finished." << std::endl; global_stream_lock.unlock(); boost::thread_group worker_threads; for ( int x = 0; x < 2; ++x ) { worker_threads.create_thread( boost::bind( &WorkerThread, io_service ) ); } io_service->post( boost::bind( &RaiseAnException, io_service ) ); worker_threads.join_all(); return 0; } |
上面这个代码将引起程序崩溃。通过调试,我们可以发现抛出的异常没有被处理
正确处理如下
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | #include <boost/asio.hpp> #include <boost/shared_ptr.hpp> #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/bind.hpp> #include <iostream> boost::mutex global_stream_lock; void WorkerThread(boost::shared_ptr< boost::asio::io_service > io_service) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Start" << std::endl; global_stream_lock.unlock(); while ( true ) { try { boost::system::error_code ec; io_service->run(ec); if (ec) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Error: " << ec << std::endl; global_stream_lock.unlock(); } break ; } catch (std::exception & ex) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Exception: " << ex.what() << std::endl; global_stream_lock.unlock(); } } global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] Thread Finish" << std::endl; global_stream_lock.unlock(); } void RaiseAnException(boost::shared_ptr< boost::asio::io_service > io_service) { global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] " << __FUNCTION__ << std::endl; global_stream_lock.unlock(); io_service->post(boost::bind(&RaiseAnException, io_service)); throw (std::runtime_error( "Oops!" )); } int main( int argc, char * argv[]) { boost::shared_ptr< boost::asio::io_service > io_service( new boost::asio::io_service ); boost::shared_ptr< boost::asio::io_service::work > work( new boost::asio::io_service::work(*io_service) ); global_stream_lock. lock (); std::cout << "[" << boost::this_thread::get_id() << "] The program will exit when all work has finished." << std::endl; global_stream_lock.unlock(); boost::thread_group worker_threads; for ( int x = 0; x < 2; ++x) { worker_threads.create_thread(boost::bind(&WorkerThread, io_service)); } io_service->post(boost::bind(&RaiseAnException, io_service)); worker_threads.join_all(); return 0; } |
作 者: itdef
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欢迎转帖 请保持文本完整并注明出处
技术博客 http://www.cnblogs.com/itdef/
B站算法视频题解
https://space.bilibili.com/18508846
qq 151435887
gitee https://gitee.com/def/
欢迎c c++ 算法爱好者 windows驱动爱好者 服务器程序员沟通交流
如果觉得不错,欢迎点赞,你的鼓励就是我的动力


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