release GVL if filesystem I/O is required

Filesystem I/O has unpredictable latency, release the GVL
in these cases since we will never know how long it lasts.
We enable interrupt processing since we may be operating
on FIFOs.

(Matz) Ruby 1.9 and 2.0 releases GVL for all file system
operations, too.

1 files changed, 2 insertions, 0 deletions

diff --git a/extconf.rb b/extconf.rb
index 026b6c3..0709016 100644
--- a/extconf.rb
+++ b/extconf.rb
@@ -2,6 +2,8 @@ require 'mkmf'
 
 dir_config('magic')
 have_library('magic', 'magic_open')
+have_func('rb_thread_call_without_gvl')
+have_func('rb_thread_blocking_region')
 create_makefile('mahoro')
 
 # arch-tag: extconf