fix blocking function spec

1 files changed, 7 insertions, 4 deletions

diff --git a/spec/ffi/function_spec.rb b/spec/ffi/function_spec.rb
index 14fe31c..a17cbbe 100644
--- a/spec/ffi/function_spec.rb
+++ b/spec/ffi/function_spec.rb
@@ -64,10 +64,13 @@ describe FFI::Function do
 
   it 'can wrap a blocking function' do
     fp = FFI::Function.new(:void, [ :int ], @libtest.find_function('testBlocking'), :blocking => true)
-    time = Time.now
-    threads = []
-    threads << Thread.new { fp.call(2) }
-    threads << Thread.new(time) { expect(Time.now - time).to be < 1 }
+    threads = 10.times.map do |x|
+      Thread.new do
+        time = Time.now
+        fp.call(2)
+        expect(Time.now - time).to be > 2
+      end
+    end
     threads.each { |t| t.join }
   end