• 1. priority inheritance mutex: 优先级继承互斥信号量

• 1.When created, a VxWorks mutex object accepts a Boolean parameter that indicates whether priority inheritance should be performed by the mutex.
  VxWorks的互斥锁在创建的时候，可以用一个布尔参数表示是否要优先级继承。
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• 2.A POSIX API for creating a pthread_mutex lets the mutex implement the priority-inheritance protocol.
  用于创建pthread _ mutex的POSIX API使用互斥锁来实现优先级继承协议。
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• 3.Only the owning task may successfully call semGive. The VxWorks mutex also has the ability to support both priority inheritance (basic priority inheritance protocol) and deletion safety.
  只有当前任务才能释放锁，同时还支持优先级继承（基本优先级继承协议）和死亡安全监测。
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