Re: Trying to use cthread_fork() in the right way

[Jose Luis Alarcon Sanchez]

El vie, 25-03-2005 a las 10:22 +0900, Andre Caldas escribió:
> Hello!
> 
> I didn't really started hacking the Hurd, so I may be talking really 
> silly here!
> 
> >     cthread_detach (cthread_fork (function_name, (void *) port_name));
> >
> > but with this structure, is clear that there gonna be problems for tell 
> > that the 
> > sent integer is s and the received is r. I was wasting time trying some bad 
> > ideas,
> 
> What structure? I don't see the problem here! You sent an integer whose 
> value is contained in s, and is trying to "receive" it's value in r.
> 
> Is port_name a pointer? Or an integer? How are you "uncasting" it?
> 
> If it is a pointer, then you need to keep the structure it points to 
> valid during the call.
> 
> 
> > but the code don't do what i want.
> 
> What code?
> 
> > Maybe the the port destination
> > can't be used by the two threads, for a rights problem, i don't know, i'm 
> > trying to learn.
> 
> As far as I know, the port thing is designed to work with threads.
> 
> >   If yes, if is possible to get that one thread do the sending of the 
> > integer and another 
> > thread take this integer from the destination port.... how is the form (in 
> > generic) to
> > use cthread_fork() for adapt it to this case?.
> 
> I think what you said you did is OK. Maybe you are not doing exactly 
> what you think you are. The full code would help...
> 
> 
> >   Maybe the previous structure of the program, with two separate functions 
> > for send and 
> > receive and two diferents variables (s for "what" is sent and r for "what" 
> > is received)
> > do more dificult the adaptation to a threads case.
> 
> There is no problem with that. If you require "s" and "r" to be the same 
> thing, there is no point in "sending" and "receiving"! You could just 
> read "s"!! By the way, when you call your "send" function, only the 
> *value* stored in "s" is passed to it. The function is probably not 
> aware of any "s", anyway.
> 
> 
> Andre Caldas.


  Hi Andre!.

  Thanks you, very much, for take interest in my question.

  This program

     http://www.nongnu.org/hurdextras/ipc_guide/code/bootstrap_ipc.c

works.

  I only was trying to "introduce" the cthreads programming to it, but i
am afraid that my skills making new code are not too wide.

  I know the message can be received through the same variable used for
send it, but i found "nice" this author's method for use two diferents
variables.

  Thanks, anyway.

  Regards.

  Jose.


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