This repo contains example code that shows thread deadlock and thread starvation issues in Ruby. See thread_deadlock.rb and thread_starve.rb. The results from tests on different Ruby runtimes are shown below.
Demonstration of problems in Ruby Concurrency
| MRI 1.8.7 | MRI 1.9.3 | MRI 2.1.5 | MRI Head (Jan 2016) | |
|---|---|---|---|---|
| Deadlock | Yes | Yes | Yes | No |
| Stavartion | Yes | Hard to say. Always deadlocks | Yes | Yes |
| JRuby 1.6.8 | JRuby 1.7.11 | Jruby 1.7.19 | JRuby 9.0.0.0.pre1 | |
|---|---|---|---|---|
| Deadlock | Yes | No Deadlock or Starvation only because the Timeout exception is not raised | No Deadlock or Starvation only because the Timeout exception is not raised | No Deadlock or Starvation only because the Timeout exception is not raised |
| Starvation | Yes | No Deadlock or Starvation only because the Timeout exception is not raised | No Deadlock or Starvation only because the Timeout exception is not raised | No Deadlock or Starvation only because the Timeout exception is not raised |
| RBX 2.4.1 | RBX 2.5.2 | |
|---|---|---|
| Deadlock | VM Crashes | Yes. Though most times we see thread starvation |
| Starvation | VM Crashes | Yes |