From: "Bermejo, Rodrigo" <rodrigo.bermejo@...>
Date: 2003-07-16T03:49:28+09:00
Subject: Re: file locking


have you checked it  'http://raa.ruby-lang.org/list.rhtml?name=filelock' 
  out

-r.


Bedo Sandor wrote:

>
>  Hi All,
>
>There are 3 different file locking mechanisms in C:
>
>	flock
>	lockf
>	fcntl
>
>I want to write a Ruby script, which shares files with
>a C program using all of these lockings.
>
>As I can see objects with the type File have an flock
>method.  This is the only one I can use.  There is an
>fcntl method, but I don't know how to use it.  What
>kind of parameters can I pass to fcntl?  I want to
>implement this code in Ruby for fcntl:
>
>	def lock_fcntl(fd)
>	
>		# struct flock f_lock;
>
>		# memset(&f_lock, '\0', sizeof(f_lock));
>		# f_lock.l_type   = F_WRLCK;
>		# f_lock.l_whence = SEEK_SET;
>		# f_lock.l_start  = 0;
>		# f_lock.l_len    = 0;
>		# fcntl(fd, F_SETLKW, &f_lock);
>	
>	end
>
>and I need a lockf-type method too:
>
>	def lock_lockf(fd)
>		# ???
>	end
>
>Could you show me how to use fcntl, and how to
>access lockf from Ruby?
>
>  
>

-- 
 General Electric - CIAT
 Advanced Engineering Center
 ________________________________________
 Rodrigo Bermejo 
 Information Technologies.
 Dial-comm : *879-0644         
 Phone :(+52) 442-196-0644
 mailto:rodrigo.bermejo@ps.ge.com