Bump version to 0.2.2

VERSION

@@ -1 +1,2 @@
-0.2.1
+0.2.2
+

lib/process_shared/posix/libc.rb

@@ -26,9 +26,10 @@ module ProcessShared
         #
         # Fallback to attempting to load from same directory as this file.
         helper = 'process_shared/posix/helper.' + suffix
-        fallback_path = File.expand_path(File.dirname(__FILE__))
-        path = $LOAD_PATH.find(fallback_path) do |path|
-          File.exist?(File.join(path, helper))
+        gem_spec = Gem::Specification.find_all.find{|g| g.name == 'process_shared'}
+        path = gem_spec.extensions_dir
+        unless path.end_with?(gem_spec.full_name)
+          path = File.join(path, gem_spec.full_name)
         end
 
         if  defined?(Truffle)

lib/process_shared/posix/semaphore.rb

@@ -46,8 +46,8 @@ module ProcessShared
       # +shm_unlink+ on +sem+.
       #
       # @return [Proc] a finalizer
-      def self.make_finalizer(sem)
-        proc { LibC.shm_unlink(sem) }
+      def self.make_finalizer(sem) # already called in SharedMemory
+        Proc.new{}
       end
 
       # Create a new semaphore with initial value +value+.  After