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Project 3 Roadmap

Project 3 Roadmap. Message Passing. Fast communication mechanism Usually implemented as a Circular Buffer Think of an UNIX pipe. Message_Queue_Create(). int Message_Queue_Create(const char *name, ulong_t queue_size) similar to Create_Semaphore()

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Project 3 Roadmap

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  1. Project 3 Roadmap Message Passing

  2. Fast communication mechanism • Usually implemented as a Circular Buffer • Think of an UNIX pipe

  3. Message_Queue_Create() • int Message_Queue_Create(const char *name, ulong_t queue_size) • similar to Create_Semaphore() • each queue has name, id and a bounded size • shared among threads • add a message queue list to User_Context

  4. Message_Queue_Destroy() • int Message_Queue_Destroy(int mqid) • similar to Destroy_Semaphore() • keep a ref count, free only when ref count reaches 0

  5. Message_Queue_Send() • int Message_Queue_Send(int mqid, void * buffer, ulong_t message_size) • check buffer and message size • similar to Write() • blocks is queue full

  6. Message_Queue_Receive() • int Message_Queue_Receive(int mqid, void * buffer, ulong_t message_size) • check buffer and message size • similar to Read() • blocks is queue empty

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