normal	2018-06-27 08:44:00 +0900 (Wed, 27 Jun 2018)

  New Revision: 63754

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63754

  Log:
    bootstraptest/runner: speed up assert_finish by avoiding sleep
    
    We may use IO.select to watch for process exit.  This speeds up
    "make test" by 2 seconds for me.

  Modified files:
    trunk/bootstraptest/runner.rb
Index: bootstraptest/runner.rb
===================================================================
--- bootstraptest/runner.rb	(revision 63753)
+++ bootstraptest/runner.rb	(revision 63754)
@@ -373,13 +373,18 @@ def assert_finish(timeout_seconds, tests https://github.com/ruby/ruby/blob/trunk/bootstraptest/runner.rb#L373
     io = IO.popen("#{@ruby} -W0 #{filename}")
     pid = io.pid
     waited = false
-    tlimit = Time.now + timeout_seconds
-    while Time.now < tlimit
+    tlimit = Process.clock_gettime(Process::CLOCK_MONOTONIC) + timeout_seconds
+    diff = timeout_seconds
+    while diff > 0
       if Process.waitpid pid, Process::WNOHANG
         waited = true
         break
       end
-      sleep 0.1
+      if IO.select([io], nil, nil, diff)
+        while String === io.read_nonblock(1024, exception: false)
+        end
+      end
+      diff = tlimit - Process.clock_gettime(Process::CLOCK_MONOTONIC)
     end
     if !waited
       Process.kill(:KILL, pid)

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