标签:des c style class blog code
敏捷开发大家想必知道并且评价甚高,缩短开发周期,提高开发质量。将大project独立为不同的小app开发,整个开发过程,程序可用可測,所以提高了总体的质量。基于这样的开发模式和开发理念,进程间通信必定是童鞋们必掌握技能之中的一个了,而boost库是众多库中平台支持性非常好,效果非常高之中的一个。做嵌入式或者server等应用的人肯定有所涉及。本文以手冊方式讲述boost共享内存,信号,以及消息队列的编程方式。非常easy,列出最经常使用使用方法,供大家拷贝直接使用。本文出自CSDN-固本培元。转载注明出处-leoluopy@gmail.com。
#include <boost/interprocess/shared_memory_object.hpp> #include <boost/interprocess/mapped_region.hpp> #include <cstring> #include <cstdlib> #include <string> int main(int argc, char *argv[]) { using namespace boost::interprocess; if(argc == 1){ //Parent process //Remove shared memory on construction and destruction struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover; //Create a shared memory object. shared_memory_object shm (create_only, "MySharedMemory", read_write); //Set size shm.truncate(1000); //Map the whole shared memory in this process mapped_region region(shm, read_write); //Write all the memory to 1 std::memset(region.get_address(), 1, region.get_size()); //Launch child process std::string s(argv[0]); s += " child "; if(0 != std::system(s.c_str())) return 1; } else{ //Open already created shared memory object. shared_memory_object shm (open_only, "MySharedMemory", read_only); //Map the whole shared memory in this process mapped_region region(shm, read_only); //Check that memory was initialized to 1 char *mem = static_cast<char*>(region.get_address()); for(std::size_t i = 0; i < region.get_size(); ++i) if(*mem++ != 1) return 1; //Error checking memory } return 0; }
贴出一个经常使用带參数的写法,具体的其它使用方法能够參考文章末的參考文章:
#include <boost/signal.hpp> #include <boost/thread/thread.hpp> #include <boost/date_time/posix_time/posix_time.hpp> #include <iostream> using namespace std; using namespace boost; float print_sum(float x, float y) { std::cout << "The sum is " << x+y << std::endl; return x+y; } float print_product(float x, float y) { std::cout << "The product is " << x*y << std::endl; return x*y; } float print_difference(float x, float y) { std::cout << "The difference is " << x-y << std::endl; return x-y; } float print_quotient(float x, float y) { std::cout << "The quotient is " << x/y << std::endl; return x/y; } int main() { boost::signal<float (float , float )> sig; sig.connect(0, &print_sum); sig.connect(1, &print_product); sig.connect(2, &print_difference); sig.connect(3, &print_quotient); // Output 1.6667 because return by the last slot called. cout << sig(5, 3) << endl; return 0; }
Seg 1: Disconnecting slots. boost::signals::connection c = sig.connect(HelloWorld()); if (c.connected()) { // c is still connected to the signal sig(); // Prints "Hello, World!" } c.disconnect(); // Disconnect the HelloWorld object assert(!c.connected()); //c isn‘t connected any more sig(); // Does nothing: there are no connected slots Seg 2: boost::signals::connection c = sig.connect(HelloWorld()); sig(); // Prints "Hello, World!" c.block(); // block the slot assert(c.blocked()); sig(); // No output: the slot is blocked c.unblock(); // unblock the slot sig(); // Prints "Hello, World!"
消息队列发送:
#include <boost/interprocess/ipc/message_queue.hpp> #include <iostream> #include <vector> using namespace boost::interprocess; int main () { try{ //Erase previous message queue message_queue::remove("message_queue"); //Create a message_queue. message_queue mq (create_only //only create ,"message_queue" //name ,100 //max message number ,sizeof(int) //max message size ); //Send 100 numbers for(int i = 0; i < 100; ++i){ mq.send(&i, sizeof(i), 0); } } catch(interprocess_exception &ex){ std::cout << ex.what() << std::endl; return 1; } return 0; }
#include <boost/interprocess/ipc/message_queue.hpp> #include <iostream> #include <vector> using namespace boost::interprocess; int main () { try{ //Open a message queue. message_queue mq (open_only //only create ,"message_queue" //name ); unsigned int priority; message_queue::size_type recvd_size; //Receive 100 numbers for(int i = 0; i < 100; ++i) { int number; mq.receive(&number, sizeof(number), recvd_size, priority); printf("I:%d Rec:%d\n",i,number); if(number != i || recvd_size != sizeof(number)) return 1; } } catch(interprocess_exception &ex){ message_queue::remove("message_queue"); std::cout << ex.what() << std::endl; return 1; } message_queue::remove("message_queue"); return 0; }
编译命令:
[root@localhost tmp]# g++ boost_queue_send.cpp -o queue_send -lboost_thread -lboost_system [root@localhost tmp]# g++ boost_queue_rec.cpp -o queue_rec -lboost_thread -lboost_system
參考文章:
Boost.Interprocess使用手冊翻译之四:在进程间共享内存 (Sharing memory between
processes)
http://blog.csdn.net/great3779/article/details/7226388
http://blog.csdn.net/bxhj3014/article/details/2082255
http://blog.csdn.net/liuchangyu23/article/details/4584045
http://blog.csdn.net/linkerlin/article/details/2249906
http://blog.csdn.net/liuchangyu23/article/details/4584346
boost进程间通信经常使用开发一篇全(消息队列,共享内存,信号),布布扣,bubuko.com
boost进程间通信经常使用开发一篇全(消息队列,共享内存,信号)
标签:des c style class blog code
原文地址:http://www.cnblogs.com/mfrbuaa/p/3763402.html