Re: data modified by second NRT write with same memory location

[Philippe Gerum <rpm@xenomai.org>]

yo sang <stlfatboy@hotmail.com> writes:

> Hi,
>
> 	I was playing with xddp recently, and found a strange situation.
> 	I modified official example xddp-echo to test my case:
>
> 	Main()
> 		*   =>  get socket                                        
>  		*   =>  bind socket to port 0    
> 		*   =>  open /dev/rtp0    
>
> 		*	=>  create data buf with “first”                                 
>  		*   =>  write buf to RT domain via write()    
> 		* 	=>  modify data buf to “second”
> 　　	*   =>  write buf to RT domain via write()   
> 　　
> 	* Start realtime_thread-------------------------------------->----------+        
> 　　	*   =>  read from NRT domain via recvfrom()     
> 　　	*	=>  print output: “second"
>  		*   =>  read from NRT domain via recvfrom()                                                           
> 　		*	=>  print output: “second”       
> 　
> 　If I write twice with same data location, the RT-end will receive “second” twice.
> 　
> 　Any comments?
> 　Thanks
>
>              

Please send the shortest possible piece of code illustrating the issue.

-- 
Philippe.