From a0d0c7575cdef7c6a6249b4ac8b1779778eaca8c Mon Sep 17 00:00:00 2001
From: Patrick Mahoney <pat@polycrystal.org>
Date: Sat, 17 Dec 2011 10:06:24 -0600
Subject: [PATCH] Test Semaphore#try_wait() that doesn't end in ETIMEDOUT.

---
 spec/process_shared/semaphore_spec.rb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/spec/process_shared/semaphore_spec.rb b/spec/process_shared/semaphore_spec.rb
index 0e3acc4..3e3fa1c 100644
--- a/spec/process_shared/semaphore_spec.rb
+++ b/spec/process_shared/semaphore_spec.rb
@@ -95,6 +95,23 @@ module ProcessShared
           (Time.now.to_f - start).must be_gte(0.1)
         end
       end
+
+      it 'returns after waiting if another processes posts' do
+        Semaphore.open(0) do |sem|
+          start = Time.now.to_f
+
+          pid = fork do
+            sleep 0.01
+            sem.post
+            Kernel.exit!
+          end
+
+          sem.try_wait(0.1)
+          (Time.now.to_f - start).must be_lt(0.1)
+
+          ::Process.wait(pid)
+        end
+      end
     end
   end
 end