使用named_mutex和named_condition配合实现读写锁

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于 2020-12-26 11:41:10 发布

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分类专栏： C++ mutex 锁机制文章标签： c++

本文链接：https://blog.youkuaiyun.com/CHYabc123456hh/article/details/111724770

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代码

代码的名称是read_write_mutex.h
初步优化
如果涉及到进程挂掉了，造成进程堵塞，如何解决？还未涉及

#include <boost/interprocess/sync/named_condition.hpp>
#include <boost/interprocess/sync/named_mutex.hpp>

namespace bip = boost::interprocess;
namespace chy{
    class shared_mutex
    {
    private:
        class state_data{
        public:
            state_data() :
                shared_count(0),
                exclusive(false),
                exclusive_waiting_blocked(false)
            {}

            void assert_free() const{
                BOOST_ASSERT( ! exclusive );
                BOOST_ASSERT( shared_count==0);
            }

            void assert_locked() const{
                BOOST_ASSERT( exclusive);
                BOOST_ASSERT( shared_count==0);
            }

            void assert_lock_shared() const{
                BOOST_ASSERT( !exclusive);
                BOOST_ASSERT( shared_count>0 );
            }

            bool can_lock() const{
                return ! (shared_count || exclusive);
            }

            void exclusive_blocked (bool blocked){
                exclusive_waiting_blocked = blocked;
            }

            void lock(){
                exclusive = true;
            };

            void unlock(){