move Application#determine_n_threads -> Util.determine_n_threads

lib/rscons/application.rb

@@ -21,7 +21,7 @@ module Rscons
 
     # Create Application instance.
     def initialize
-      @n_threads = determine_n_threads
+      @n_threads = Util.determine_n_threads
       @vars = VarSet.new
     end
 
@@ -157,39 +157,6 @@ module Rscons
       rv
     end
 
-    # Determine the number of threads to use by default.
-    #
-    # @return [Integer]
-    #   The number of threads to use by default.
-    def determine_n_threads
-      # If the user specifies the number of threads in the environment, then
-      # respect that.
-      if ENV["RSCONS_NTHREADS"] =~ /^(\d+)$/
-        return $1.to_i
-      end
-
-      # Otherwise try to figure out how many threads are available on the
-      # host hardware.
-      begin
-        case RbConfig::CONFIG["host_os"]
-        when /linux/
-          return File.read("/proc/cpuinfo").scan(/^processor\s*:/).size
-        when /mswin|mingw/
-          if `wmic cpu get NumberOfLogicalProcessors /value` =~ /NumberOfLogicalProcessors=(\d+)/
-            return $1.to_i
-          end
-        when /darwin/
-          if `sysctl -n hw.ncpu` =~ /(\d+)/
-            return $1.to_i
-          end
-        end
-      rescue
-      end
-
-      # If we can't figure it out, default to 1.
-      1
-    end
-
   end
 
 end