Semaphore 数据结构分解详解

│    waitlink *sudog    │─────┘      │    waitlink *sudog    │──────┘      │    waitlink *sudog    │ 

├───────────────────────┤            ├───────────────────────┤             ├───────────────────────┤ 

│    waittail *sudog    │            │    waittail *sudog    │             │    waittail *sudog    │ 

└───────────────────────┘            └───────────────────────┘             └───────────────────────┘ 

中间的元素的 waittail 都会指向最后一个元素:

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

│  sudog   │                                                                                            

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

│    waitlink *sudog    │                                                                               

├───────────────────────┤                                                                               

│    waittail *sudog    │───────────────────────────────────────────────────────────┐                   

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

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