Thread.status == 'run' while some blocking IO
---------------------------------------------
Key: JRUBY-5238
URL: http://jira.codehaus.org/browse/JRUBY-5238
Project: JRuby
Issue Type: Improvement
Components: Core Classes/Modules
Affects Versions: JRuby 1.5.5
Environment: jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03
9cf97c3) (OpenJDK 64-Bit Server VM 1.6.0_20) [amd64-java]
Reporter: Hiroshi Nakamura
Assignee: Hiroshi Nakamura
Thread.status is 'run' while blocking read/write. It should be 'sleep' though
Threads of JRuby actually sleeps. (No busy loop: CPU 0%)
It's just a cosmetic state management but it's the only way to check if Thread
is blocking or not in Ruby.
{noformat}
require 'socket'
require 'timeout'
server = TCPServer.new('127.0.0.1', 0)
port = server.addr[1]
client = TCPSocket.new('127.0.0.1', port)
r = Thread.new {
client.read
}
w = Thread.new {
# write enough bytes to block.
client.write("foo\n" * 1000000);
# JRuby on Windows does not block here.
}
def wait_block(t)
begin
timeout(2) do
sleep 0.1 while t.status != 'sleep'
end
rescue Timeout::Error
raise 'Thread is running...'
end
end
begin
wait_block(r)
wait_block(w)
ensure
p(Thread.list - [Thread.current]) #=> sleep(read), sleep(write)
end
{noformat}
{noformat}
0% ruby187 -v rw.rb
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]
[#<Thread:0x7f766eecf298 sleep>, #<Thread:0x7f766eecf388 sleep>]
0% ruby -v rw.rb
ruby 1.9.3dev (2010-11-26 trunk 29941) [x86_64-linux]
[#<Thread:0x00000001a955a0 sleep>, #<Thread:0x00000001a95528 sleep>]
0% jruby -v rw.rb
jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03 9cf97c3) (OpenJDK 64-Bit
Server VM 1.6.0_20) [amd64-java]
bin/jruby [#<Thread:0x7219d6afrun>, #<Thread:0x7e5db5aerun>,
#<Thread:0x3a42f352run>]
rw.rb:25:in `wait_block': Thread is running... (RuntimeError)
from rw.rb:30
1% bin/jruby -v rw.rb
jruby 1.6.0.dev (ruby 1.8.7 patchlevel 249) (2010-12-04 2130381) (OpenJDK
64-Bit Server VM 1.6.0_20) [linux-amd64-java]
[#<Thread:0x21719f30 sleep>, #<Thread:0x2a8a1977 sleep>]
0%
{noformat}
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