介紹

• named_mutex是一個進程鎖，考慮到進程和線程之間的區別
• 區別：一個工作單元要想被稱作進程，它必須要有操作系統指派給他的地址空間，必須擁有進程ID，必須擁有狀態和進程表中的表項。進程和線程之間最大的區別是進程有著自己的地址空間，而線程共享創建它們的進程的地址空間。
• 本例子是使用多線程的方式來測進程鎖的線程安全
• 等一切結束的時候，好好總結一下，完善這個大坑

代碼

#include <boost/thread/thread.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <boost/interprocess/sync/named_mutex.hpp> #include <boost/ref.hpp>#include <string> #include <mutex>//boost::shared_mutex global_mutex; int global_num = 10;//全局變量，寫者改變全局變量，讀者讀全局變量 namespace bip = boost::interprocess; bip::named_mutex global_mutex(bip::open_or_create,"mtx");//讀線程 void read_thread(std::string &name){boost::lock_guard<bip::named_mutex> lock(global_mutex);//讀鎖定 // bip::named_mutex global_mutex(bip::open_or_create,"mtx"); // global_mutex.lock();printf("線程%s搶占了資源，global_num = %d\n",name.c_str(),global_num);boost::this_thread::sleep(boost::posix_time::seconds(1));printf("線程%s釋放了資源...\n",name.c_str()); // global_mutex.unlock(); }//寫線程 void write_thread(std::string &name){std::lock_guard<bip::named_mutex> lock(global_mutex);//寫鎖定 // bip::named_mutex global_mutex(bip::open_or_create,"mtx"); // global_mutex.lock();global_num++;//寫線程改變數據的數值printf("線程%s搶占了資源，global_num = %d\n",name.c_str(),global_num);boost::this_thread::sleep(boost::posix_time::seconds(1));printf("線程%s釋放了資源...\n",name.c_str()); // global_mutex.unlock(); }int main(){std::string read_thread_r1 = "read_thread_r1";std::string read_thread_r2 = "read_thread_r2";std::string read_thread_r3 = "read_thread_r3";std::string read_thread_r4 = "read_thread_r4";std::string read_thread_r5 = "read_thread_r5";std::string write_thread_w1 = "write_thread_w1";std::string write_thread_w2 = "write_thread_w2";boost::thread_group tg;tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r1)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r2)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r3)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r4)));tg.create_thread(boost::bind(read_thread,boost::ref(read_thread_r5)));tg.create_thread(boost::bind(write_thread,boost::ref(write_thread_w1)));tg.create_thread(boost::bind(write_thread,boost::ref(write_thread_w2)));tg.join_all();return 0; }

參考鏈接

• 使用boost.threads的condition構造的讀寫鎖

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