Semaphore 数据结构分解详解

      │                                                     │                   

      │                                                     │                   

      ▼                                                     ▼                   

 ┌─────────┐                                           ┌─────────┐              

 │ struct  │                                           │ struct  │              

 ├─────────┴─────────┐                                 ├─────────┴─────────┐    

 │   root semaRoot   │──┐                              │   root semaRoot   │──┐ 

 ├───────────────────┤  │                              ├───────────────────┤  │ 

 │        pad        │  │                              │        pad        │  │ 

 └───────────────────┘  │                              └───────────────────┘  │ 

                        │                                                     │ 

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