----- 原始邮件 ----- 发件人：Philippe Gerum <[email protected]> 收件人：[email protected] 主题：Re: 回复：Re:_回复：Re: [Xenomai-help]How to add"t_restart" to pSoS emulator 日期：2010-9-23 20:33:57
On Thu, 2010-09-23 at 17:52 +0800, [email protected] wrote: >> Thank you Philippe very much. I am working on porting our pSoS code to >> xenomai. There are many syscall "t_restart" in our code. The case is >> not like what you mentioned. Let me give a example to illustrate our >> case: >> > >Task A create and start Task B with parameter "X", then Task B run and >> suspend when its parameter is "X". At rigth time, Task A restart Task >> B with parameter "Y", the Task will re-run with a new parameter "Y" >> and won't suspend. > I still don't see the requirement for t_restart() in your description. > Task A doing t_delete(task B), then t_create(task B) + t_start(task B, > param=X or Y) would behave exactly the same way AFAICS. Again, the only > feature that t_restart() buys you is forcibly unblocking a task from a > pending state, at the expense of branching back to its entry point. Task > B does not seem to pend on anything, it is merely suspended, and only > waits for task A for resetting it. I see no difference with > self-deletion followed by a respawn. Yes, it seems the better way is deleting task B and then creating and starting it. The only side effect is that the task ID of task B will be changed to a new one. But that shuld not be a problem. >> >> >> >> I just don't want to modify the code and want to implement the syscall >> "restart" to make the porting smoothly. >> >> > t_restart() has non-trivial semantics for user-space threads. Trying to > emulate it may cost more than getting rid of it, unless you are ready to > invest some time to make your way through Xenomai's innards. YMMV. I am very interested in xenomai and I hope I can have more time to research it deeply. Thanks. >> >> >> Best regards >> >> Wenyi Gao >> >> > -- >Philippe.
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