Patrice's fixes for GNU Pthread support

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40330

src/thread/SDL_thread.c

@@ -52,6 +52,12 @@ int SDL_ThreadsInit(void)
 {
 	int retval;
 
+#ifdef ENABLE_PTH
+	if (!pth_init()) {
+		return -1;
+	}
+#endif
+
 	retval = 0;
 	/* Set the thread lock creation flag so that we can reuse an
 	   existing lock on the system - since this mutex never gets
@@ -80,6 +86,10 @@ void SDL_ThreadsQuit()
 	if ( mutex != NULL ) {
 		SDL_DestroyMutex(mutex);
 	}
+
+#ifdef ENABLE_PTH
+	pth_kill();
+#endif
 }
 
 /* Routines for manipulating the thread list */