Add shim to support condition variable wakeup fds where pipe/eventfd is not available
diff --git a/grpc.gemspec b/grpc.gemspec
index f249006..d672bb1 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -226,6 +226,7 @@
   s.files += %w( src/core/lib/iomgr/timer_heap.h )
   s.files += %w( src/core/lib/iomgr/udp_server.h )
   s.files += %w( src/core/lib/iomgr/unix_sockets_posix.h )
+  s.files += %w( src/core/lib/iomgr/wakeup_fd_cv.h )
   s.files += %w( src/core/lib/iomgr/wakeup_fd_pipe.h )
   s.files += %w( src/core/lib/iomgr/wakeup_fd_posix.h )
   s.files += %w( src/core/lib/iomgr/workqueue.h )
@@ -387,6 +388,7 @@
   s.files += %w( src/core/lib/iomgr/udp_server.c )
   s.files += %w( src/core/lib/iomgr/unix_sockets_posix.c )
   s.files += %w( src/core/lib/iomgr/unix_sockets_posix_noop.c )
+  s.files += %w( src/core/lib/iomgr/wakeup_fd_cv.c )
   s.files += %w( src/core/lib/iomgr/wakeup_fd_eventfd.c )
   s.files += %w( src/core/lib/iomgr/wakeup_fd_nospecial.c )
   s.files += %w( src/core/lib/iomgr/wakeup_fd_pipe.c )