From: Philip Mak <pmak@...>
Date: 2003-09-14T14:59:27+09:00
Subject: Deadlock?

I have a multi-threaded http server. Sometimes, it gets into a state
where it stops responding to requests, and if I press Ctrl+C at the
console it takes a long time to respond. The "ruby -rprofile" shows
this at the top:

  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
 62.65     1.04      1.04       30    34.67   853.00  Thread#stop
  9.64     1.20      0.16       37     4.32    18.38  Kernel.require
  9.04     1.35      0.15        1   150.00   220.00  IO#each
  7.23     1.47      0.12      152     0.79     0.92  Kernel.sleep

I never call Thread#stop explicitly in my program so it's surprising
that Thread#stop takes up so much time... although I do have both
Timeout and Mutex.

Anyone know what to make of this 62.65% time consumption by
Thread#stop? Could it be that somehow my threads are deadlocking each
other?