Class: ThreadGroup

Relationships & Source Files
Inherits:	Object
Defined in:	thread.c

Constant Summary

Default =

The default ThreadGroup created when Ruby starts; all Threads belong to it by default.

# File 'thread.c', line 4895
```
th->thgroup
```

Instance Attribute Summary

#enclosed? ⇒ Boolean readonly

Returns true if the thgrp is enclosed.

Instance Method Summary

#add(thread) ⇒ thgrp

Adds the given thread to this group, removing it from any other group to which it may have previously been a member.
#enclose ⇒ thgrp

Prevents threads from being added to or removed from the receiving ThreadGroup.
#list ⇒ Array

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

Instance Attribute Details

#enclosed? ⇒ `Boolean` (readonly)

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

Instance Method Details

#add(thread) ⇒ `thgrp`

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

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}"

This will produce:

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>

#enclose ⇒ `thgrp`

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
#=> ThreadError: can't move from the enclosed thread group

#list ⇒ Array

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

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