describe :pid thread variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16208 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/open3.rb b/lib/open3.rb
index 3824c81378..5efcb173cc 100644
--- a/lib/open3.rb
+++ b/lib/open3.rb
@@ -64,10 +64,13 @@ module Open3
   # 
   # Open stdin, stdout, and stderr streams and start external executable.
   # In addition, a thread for waiting the started process is noticed.
+  # The thread has a thread variable :pid which is the pid of the started
+  # process.
   #
   # Non-block form:
   #   
   #   stdin, stdout, stderr, wait_thr = Open3.popen3w(cmd)
+  #   pid = wait_thr[:pid]  # pid of the started process.
   #   ...
   #   stdin.close  # stdin, stdout and stderr should be closed in this form.
   #   stdout.close