fiber/{base,io}: use arrays instead of hashes for r/w accounting

This gives a tiny performance improvement to the FiberSpawn and
FiberPool concurrency models.

1 files changed, 8 insertions, 6 deletions

diff --git a/lib/rainbows/fiber/io.rb b/lib/rainbows/fiber/io.rb
index 5153070..5f925ca 100644
--- a/lib/rainbows/fiber/io.rb
+++ b/lib/rainbows/fiber/io.rb
@@ -19,21 +19,23 @@ module Rainbows
       end
 
       def close
-        RD.delete(self)
-        WR.delete(self)
+        fileno = to_io.fileno
+        RD[fileno] = WR[fileno] = nil
         to_io.close unless to_io.closed?
       end
 
       def wait_readable
-        RD[self] = false
+        fileno = to_io.fileno
+        RD[fileno] = self
         ::Fiber.yield
-        RD.delete(self)
+        RD[fileno] = nil
       end
 
       def wait_writable
-        WR[self] = false
+        fileno = to_io.fileno
+        WR[fileno] = self
         ::Fiber.yield
-        WR.delete(self)
+        WR[fileno] = nil
       end
 
       def write(buf)