cooper-zhzhang commented on issue #1741:
URL: 
https://github.com/apache/incubator-brpc/issues/1741#issuecomment-1100033575

   ```
   //get 5 pthread in system
   bthread_setconcurrency(5)
   // get 6 bthread
     for (int i = 0; i < 6; ++i) {
           bthread_start_urgent(&threads[i], &attr, func, nullptr);
       }
   
   ```
   
   
   pthread 0: . run bthread0-->   lock _mutex --> bthread_yield() --> run 
bthread5 --> wait _mutex  
   pthread 1: run bthread1 --> wait _mutex
   pthread 2: run bthread2 --> wait _mutex
   pthread 3: run bthread3 --> wait _mutex
   pthread 4: run bthread4 --> wait _mutex
   
   
   
   
   
   
   
   
   
   
   


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