Thread suspension: Implement for Linux

tests/thread_suspension/nacl.scons

Index: tests/thread_suspension/nacl.scons
diff --git a/tests/thread_suspension/nacl.scons b/tests/thread_suspension/nacl.scons
index 36fbfa45be31908792bb111956ab81bcd508de0f..34c988b331a5ae82cb0fd520cb79c648cdd5c1e0 100644
--- a/tests/thread_suspension/nacl.scons
+++ b/tests/thread_suspension/nacl.scons
@@ -29,10 +29,10 @@ bootstrap, _ = env.GetBootstrap()
 if bootstrap is not None:
   test_command = [bootstrap] + test_command
 
+# TODO(mseaborn): Implement thread suspension for Mac OS X too.
+is_broken = (not env.Bit('nacl_static_link') or
+             env.Bit('host_mac'))
+
 node = env.CommandTest('thread_suspension_test.out', test_command)
-# Thread suspension is currently on implemented for Windows.
-# TODO(mseaborn): Implement thread suspension for all other platforms.
 env.AddNodeToTestSuite(node, ['small_tests'],
-                       'run_thread_suspension_test',
-                       is_broken=(not env.Bit('nacl_static_link') or
-                                  not env.Bit('host_windows')))
+                       'run_thread_suspension_test', is_broken=is_broken)