2 files changed, 29 insertions, 6 deletions
diff --git a/main.rb b/main.rb
index 1bf2203..7dc7370 100755
--- a/main.rb
+++ b/main.rb
@@ -52,6 +52,8 @@ def main
     STDERR.write "> parsing\n"
     Parse::parse input, n, active_chart, passive_chart, grammar
 
+    exit
+
     weights = SparseVector.from_kv(ReadFile.read(cfg[:weights]), ' ', "\n")
     if !weights
       weights = SparseVector.new
diff --git a/parse.rb b/parse.rb
index aebb58d..8860b8c 100644
--- a/parse.rb
+++ b/parse.rb
@@ -155,8 +155,22 @@ def Parse::parse input, n, active_chart, passive_chart, grammar
     # parse
     new_symbols = []
     remaining_items = []
-    while !active_chart.at(i,j).empty?
-      active_item = active_chart.at(i,j).pop
+    
+    num_threads = 2
+    slice_sz = active_chart.at(i,j).size/num_threads
+    slices = []
+    num_threads.times {
+      slices << active_chart.at(i,j).shift(slice_sz+1)
+    }
+    m = Mutex.new
+    threads = []
+
+    slices.each_with_index { |slice,ti|
+    threads << Thread.new(ti) { 
+    #while !active_chart.at(i,j).empty?
+    while !slice.empty?
+      #active_item = active_chart.at(i,j).pop
+      active_item = slice.pop
       advanced = false
       visit(1, i, j, 1) { |k,l|
         if passive_chart.has active_item.rhs[active_item.dot].symbol, k, l
@@ -166,13 +180,16 @@ def Parse::parse input, n, active_chart, passive_chart, grammar
             if scan new_item, input, j, passive_chart
               if new_item.dot == new_item.rhs.size
                 if new_item.left == i && new_item.right == j
-                  new_symbols << new_item.lhs.symbol if !new_symbols.include? new_item.lhs.symbol
-                  passive_chart.add new_item, i, j
+                  #new_symbols << new_item.lhs.symbol if !new_symbols.include? new_item.lhs.symbol
+                  m.synchronize { new_symbols << new_item.lhs.symbol if !new_symbols.include? new_item.lhs.symbol }
+                  #passive_chart.add new_item, i, j
+                  m.synchronize { passive_chart.add new_item, i, j }
                   advanced = true
                 end
               else
                 if new_item.right+(new_item.rhs.size-(new_item.dot)) <= j
-                  active_chart.at(i,j) << new_item
+                  #active_chart.at(i,j) << new_item
+                  slice << new_item
                   advanced = true
                 end
               end
@@ -181,9 +198,13 @@ def Parse::parse input, n, active_chart, passive_chart, grammar
         end
       }
       if !advanced
-        remaining_items << active_item
+        m.synchronize { remaining_items << active_item }
       end
     end
+    }
+
+    }
+    threads.each { |t| t.join }
 
     # 'self-filling' step
     new_symbols.each { |s|