C++unique_lock锁的使用

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1. unique_lock功能比lock_gard更加灵活强大，缺点是使用成本更高一些。

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1. #include <iostream>
   
2. #include <thread>
   
3. #include <mutex>
   
4. #include <vector>
   
5. #include <chrono>
   
6. 
   
7. std::timed_mutex g_timed_mutex;
   
8. 
   
9. void func(int val)
   
10. {
    
11.     std::unique_lock<decltype(g_timed_mutex)> lockguard(g_timed_mutex,std::defer_lock);
    
12.     //std::cout<<std::this_thread::get_id()<<"owns the lock... "<<lockguard.owns_lock()<<std::endl;
    
13.     while(!lockguard.try_lock_for(std::chrono::seconds(val)))
    
14.     {
    
15.         std::cout<<std::this_thread::get_id()<<" failed to access the lock..."<<std::endl;
    
16.         //return;
    
17.     }
    
18. 
    
19.     std::cout<<"now, "<<std::this_thread::get_id()<<" owns the lock..."<<lockguard.owns_lock()<<std::endl;
    
20.     std::this_thread::sleep_for(std::chrono::seconds(val));
    
21. }
    
22. 
    
23. int main()
    
24. {
    
25.     std::vector<std::thread> vec_threads;
    
26.     for(int i = 0; i<10; i++)
    
27.     {
    
28.         std::thread th(func,i+1);
    
29.         vec_threads.push_back(std::move(th));
    
30.     }
    
31. 
    
32.     for(int i =0; i<vec_threads.size();i++)
    
33.     {
    
34.         if(vec_threads[i].joinable())
    
35.         {
    
36.             vec_threads[i].join();
    
37.         }
    
38.     }
    
39. 
    
40.     std::cout<<"program ends..."<<std::endl;
    
41. 
    
42. }
    

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