eregon	2018-11-28 05:38:20 +0900 (Wed, 28 Nov 2018)

  New Revision: 66039

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66039

  Log:
    Update to ruby/mspec@820486a

  Modified files:
    trunk/spec/mspec/lib/mspec/matchers/block_caller.rb
Index: spec/mspec/lib/mspec/matchers/block_caller.rb
===================================================================
--- spec/mspec/lib/mspec/matchers/block_caller.rb	(revision 66038)
+++ spec/mspec/lib/mspec/matchers/block_caller.rb	(revision 66039)
@@ -1,26 +1,24 @@ https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/matchers/block_caller.rb#L1
 class BlockingMatcher
   def matches?(block)
-    started = false
-    blocking = true
-
-    thread = Thread.new do
-      started = true
+    t = Thread.new do
       block.call
-
-      blocking = false
     end
 
-    Thread.pass while !started
-
-    # Wait until the Thread status is "sleep" (then it's blocking)
-    # or nil (the Thread finished execution, it did not block)
-    while status = thread.status and status != "sleep"
-      Thread.pass
+    loop do
+      case t.status
+      when "sleep"    # blocked
+        t.kill
+        t.join
+        return true
+      when false      # terminated normally, so never blocked
+        t.join
+        return false
+      when nil        # terminated exceptionally
+        t.value
+      else
+        Thread.pass
+      end
     end
-    thread.kill
-    thread.join
-
-    blocking
   end
 
   def failure_message
@@ -33,7 +31,7 @@ class BlockingMatcher https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/matchers/block_caller.rb#L31
 end
 
 module MSpecMatchers
-  private def block_caller(timeout = 0.1)
+  private def block_caller
     BlockingMatcher.new
   end
 end

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