Ruby Forum Ruby-dev > $B%9%l%C%ICf$N(B IO#flush $B$GI=<($,Mp$l$k(B

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Thread.new do
  print " "*2047 + "foo"
  STDOUT.flush
  print "."*1025
  STDOUT.flush
end
sleep 0.1

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Index: io.c
===================================================================
--- io.c  (revision 16278)
+++ io.c  (working copy)
@@ -584,8 +584,8 @@
         return 0;
     }
     if (0 <= r) {
-        fptr->wbuf_off = r;
-        fptr->wbuf_len = r;
+        fptr->wbuf_off += r;
+        fptr->wbuf_len -= r;
         errno = EAGAIN;
     }
     if (rb_io_wait_writable(fptr->fd)) {