Class ThreadGroup
In: eval.c
Parent: Object

ThreadGroup provides a means of keeping track of a number of threads as a group. A Thread can belong to only one ThreadGroup at a time; adding a thread to a new group will remove it from any previous group.

Newly created threads belong to the same group as the thread from which they were created.

Methods

add   enclose   enclosed?   list  

Constants

Default = thgroup_default

Public Instance methods

Adds the given thread to this group, removing it from any other group to which it may have previously belonged.

   puts "Initial group is #{ThreadGroup::Default.list}"
   tg = ThreadGroup.new
   t1 = Thread.new { sleep }
   t2 = Thread.new { sleep }
   puts "t1 is #{t1}"
   puts "t2 is #{t2}"
   tg.add(t1)
   puts "Initial group now #{ThreadGroup::Default.list}"
   puts "tg group now #{tg.list}"

produces:

   Initial group is #<Thread:0x401bdf4c>
   t1 is #<Thread:0x401b3c90>
   t2 is #<Thread:0x401b3c18>
   Initial group now #<Thread:0x401b3c18>#<Thread:0x401bdf4c>
   tg group now #<Thread:0x401b3c90>

Prevents threads from being added to or removed from the receiving ThreadGroup. New threads can still be started in an enclosed ThreadGroup.

   ThreadGroup::Default.enclose        #=> #<ThreadGroup:0x4029d914>
   thr = Thread::new { Thread.stop }   #=> #<Thread:0x402a7210 sleep>
   tg = ThreadGroup::new               #=> #<ThreadGroup:0x402752d4>
   tg.add thr

produces:

   ThreadError: can't move from the enclosed thread group

Returns true if thgrp is enclosed. See also ThreadGroup#enclose.

Returns an array of all existing Thread objects that belong to this group.

   ThreadGroup::Default.list   #=> [#<Thread:0x401bdf4c run>]
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