gistfile1.diff

diff --git a/src/library.js b/src/library.js
index d0f73fd..955755e 100644
--- a/src/library.js
+++ b/src/library.js
@@ -6743,11 +6743,12 @@ LibraryManager.library = {

   pthread_key_create: function(key, destructor) {
     if (!_pthread_key_create.keys) _pthread_key_create.keys = {};
-    _pthread_key_create.keys[key] = null;
+    // values start at 0
+    _pthread_key_create.keys[key] = 0;
   },

   pthread_getspecific: function(key) {
-    return _pthread_key_create.keys[key];
+    return _pthread_key_create.keys[key] || 0;
   },

   pthread_setspecific: function(key, value) {