From: "Firestone, Mark - Technical Support" <mark.firestone@...>
Date: 2002-03-15T19:15:33+09:00
Subject: RE: Newbie  -- Please help!!

Ok.  I understand WHAT you mean... I just don't know how to get there (nor
can I find a sample to show me the way...) to get from where I am (see code
fragment below..) and where I need to be.. being able to share this object
among many threads...  the only way I have managed to set it up at
present... each thread would be creating it's own instance of the object....
not what I want to do at all.  I want each thread to share ONE instance of
the object with locking...


thanks for putting up with my ignorance!

Humbly,

mark

class User_list 

  include Enumerable 
   
  def initialize 
    @users = Array.new 
  end 
   
  def append(aUser) 
   @users.push(aUser) 
   self 
  end 
   
   
  def [](key) 
   if key.kind_of?(Integer) 
      result = @users[key] 
    else 
     result = @users.find { |user| key == user.name } 
    end 
    return result 
end 

## end   #of Class User_list 

  ## class method of User_list, so we don't need instance. 
  def self.loadusers 
    list = nil 
    File.open("users.dat") do |f|   
      list = Marshal.load(f)  ## 
      print "- Loading User Object...\n" 
    end 
    return list ## 
  end 
   
  # save list 
  def saveusers 
    File.open("users.dat", "w+") do |f| 
      Marshal.dump( self, f) ## 
    end 
    print "- Saving User Object...\n" 
  end 

  def checkpassword (username,password) 
    result = FALSE 
    if self[username] != nil ## 
      if self[username].password == password  ## 
       result = TRUE 
      end 
    else 
      print "\n-Bad username passed to def:checkpassword.  Please tell
sysop!\n" 
    end 
    return result 
  end 

  ## new end... 
end   #of Class User_list 


class Session 

  require 'thread' 

  @@busy = Mutex.new 

  # Perhaps we'll find another way to pass the socket. 
  # For now, a default value of "nil" will make it OK 
  # for ConsoleIO. 
  def initialize(socket = nil) 
    @socket = socket 
    @list = User_list.new 
  end 
   
  def open_userfile 
    if File.exists?("users.dat") 
     @list = User_list.loadusers 
      else 
        @list = User_list.new 
        @list.append(User.new('SYSOP','000-000-0000','Tempe, AZ','600 E.
Solana Drive','STUPID')) 
        @list.append(User.new('TEST','000-000-0000','Mesa, AZ','123 Sample
Street','HAPPY')) 
        print "- User File not Found.  Creating new User File\n" 
      end 
   end 
    
  def login   

    write 255.chr     #this seems to stop telnet clients that want to echo 
    write 254.chr     #from echoing.  move this to it's own def later 
    write 1.chr 
    putstr 
    
    putstr "TOPquark 1.2r (c) 1993 by TOPsoftware" 
    putstr 
    IO.foreach("welcome1.txt") { |line| putstr line } 
     
    done = FALSE 
    count = 0
     
   until (done) 
    write "Enter your name: " 
    userName = getstr(true).strip.upcase 
     
     if @list[userName] != nil 
      write "Password: " 
      password = getstr(false).strip.upcase 
       if @list.checkpassword(userName,password) == TRUE 
        done = TRUE 
       end 
     else 
       write "#{userName} right? (Y,n)"
       answer =getstr(true).strip.upcase
       if (answer == !nil) or (answer == 'Y') 
        write "Enter a password: "       
	pswd = getstr(false).strip.upcase
        @list.append(User.new(userName,'000-000-0000','A Location','An
Address',pswd)) 
	@list.saveusers
	done = TRUE
	end
     end 
 end #of Until (Done)
    putstr 
    putstr "Congratulations.  You have been granted the privilege" 
    putstr "of entry into the system by Microsoft's* certified," 
    putstr "better-than-yours-because-we-said-so security." 
    putstr 
    putstr "* Microsoft(r) is a registered trademark of a company" 
    putstr "with way more lawyers than me." 
    putstr 
  end 

  def readmsgs 
    users = ["BIG BEN", "SHO KOSUGI", "GLENN", "CAPTAIN CRUNCH", 
             "PEE-WEE HERMAN", "SUE WIDEMARK", "TINA"] 
    subjects = ["Ev Mecham", "Atari Roolz!", "Call my board!", 
                "Please don't delete me!", "Where's the file board?"] 
    putstr "From: " + pick_one(users) 
    putstr "To:   ALL" 
    putstr "Subj: " + pick_one(subjects) 
    putstr 
    putstr "Hello, world!" 
    putstr 
    putstr "END OF MESSAGES" 
  end 
-----Original Message-----
From: Olonichev Sergei [mailto:olonichev@scnsoft.com]
Sent: 14 March 2002 15:11
To: ruby-talk@ruby-lang.org
Subject: Re: Newbie -- Please help!!



Easier saing you must not have objects which can be modified at the same
time from diffrent threads, If you have to you should use critical sections.
And it does not matter whether these objects are global or not. To avoid
using global objects is a good practice.



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