* enum.c (enum_min_by): new method Enum#min_by. added Enum#max_by

  as well.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

4 files changed, 16 insertions, 6 deletions

diff --git a/lib/cgi/session.rb b/lib/cgi/session.rb
index cd6ce95f4d..a44de7cb81 100644
--- a/lib/cgi/session.rb
+++ b/lib/cgi/session.rb
@@ -365,7 +365,6 @@ class CGI
 	  raise ArgumentError, "session_id `%s' is invalid" % id
 	end
 	@path = dir+"/"+prefix+id
-	@path.untaint
 	unless File::exist? @path
 	  @hash = {}
 	end
@@ -413,7 +412,8 @@ class CGI
 
       # Close and delete the session's FileStore file.
       def delete
-	File::unlink @path
+        File::unlink @path
+      rescue Errno::ENOENT
       end
     end
 
diff --git a/lib/date.rb b/lib/date.rb
index b50e987852..b8c15a420a 100644
--- a/lib/date.rb
+++ b/lib/date.rb
@@ -711,7 +711,13 @@ class Date
 	  alias_method :__#{id.to_i}__, :#{id.to_s}
 	  private :__#{id.to_i}__
 	  def #{id.to_s}(*args, &block)
-	    (@__#{id.to_i}__ ||= [__#{id.to_i}__(*args, &block)])[0]
+            if @__#{id.to_i}__
+              @__#{id.to_i}__
+            elsif ! self.frozen?
+	      @__#{id.to_i}__ ||= __#{id.to_i}__(*args, &block)
+            else
+               __#{id.to_i}__(*args, &block)
+            end
 	  end
 	end;
       end
diff --git a/lib/thread.rb b/lib/thread.rb
index 8b27356c48..a069c4680a 100644
--- a/lib/thread.rb
+++ b/lib/thread.rb
@@ -69,7 +69,7 @@ class Mutex
   # Returns +true+ if this lock is currently held by some thread.
   #
   def locked?
-    @locked
+    @locked && true
   end
 
   #
@@ -80,7 +80,7 @@ class Mutex
     result = false
     Thread.critical = true
     unless @locked
-      @locked = true
+      @locked = Thread.current
       result = true
     end
     Thread.critical = false
@@ -92,10 +92,13 @@ class Mutex
   #
   def lock
     while (Thread.critical = true; @locked)
+      if @locked == Thread.current
+        raise ThreadError, "deadlock; recursive locking"
+      end
       @waiting.push Thread.current
       Thread.stop
     end
-    @locked = true
+    @locked = Thread.current
     Thread.critical = false
     self
   end
diff --git a/lib/timeout.rb b/lib/timeout.rb
index 0ba5293d1d..7e3ee81ed0 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -35,6 +35,7 @@ module Timeout
 
   def timeout(sec, exception=Error)
     return yield if sec == nil or sec.zero?
+    raise ThreadError, "timeout within critical session" if Thread.critical
     begin
       x = Thread.current
       y = Thread.start {