1.4.0

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/timeout.rb

@@ -0,0 +1,42 @@
+#
+# timeout.rb -- execution timeout
+#
+#= SYNOPSIS
+#
+#   require 'timeout'
+#   status = timeout(5) {
+#     # something may take time
+#   }
+#
+#= DESCRIPTION
+#
+# timeout executes the block.  If the block execution terminates successfully
+# before timeout, it returns true.  If not, it terminates the execution and
+# raise TimeoutError exception.
+#
+#== Parameters
+#
+#  : timout
+#
+#    The time in seconds to wait for block teminatation.   
+#
+#=end
+
+class TimeoutError<StandardError
+end
+
+Thread.abort_on_exception = true
+
+def timeout(sec)
+  begin
+    x = Thread.current
+    y = Thread.start {
+      sleep sec
+      x.raise TimeoutError, "execution expired" if x.status
+    }
+    yield sec
+    return true
+  ensure
+    Thread.kill y if y.status
+  end
+end