diff --git a/plugins/greenlet/greenlet.c b/plugins/greenlet/greenlet.c
index ff48aab3..7aa5903a 100644
--- a/plugins/greenlet/greenlet.c
+++ b/plugins/greenlet/greenlet.c
@@ -2,6 +2,7 @@
 #include <greenlet/greenlet.h>
 
 extern struct uwsgi_server uwsgi;
+extern struct uwsgi_python up;
 
 struct ugreenlet {
 	int enabled;
@@ -10,15 +11,22 @@ struct ugreenlet {
 	PyGreenlet **gl;
 } ugl;
 
-struct uwsgi_option greenlet_options[] = {
+static struct uwsgi_option greenlet_options[] = {
 	{"greenlet", no_argument, 0, "enable greenlet as suspend engine", uwsgi_opt_true, &ugl.enabled, 0},
 	{ 0, 0, 0, 0, 0, 0, 0 }
 };
 
-PyObject *py_uwsgi_greenlet_request(PyObject * self, PyObject *args) {
+static void gil_greenlet_get() {
+        pthread_setspecific(up.upt_gil_key, (void *) PyGILState_Ensure());
+}
 
-	uwsgi.wsgi_req->async_status = uwsgi.p[uwsgi.wsgi_req->uh->modifier1]->request(uwsgi.wsgi_req);
-	uwsgi.wsgi_req->suspended = 0;
+static void gil_greenlet_release() {
+        PyGILState_Release((PyGILState_STATE) pthread_getspecific(up.upt_gil_key));
+}
+
+static PyObject *py_uwsgi_greenlet_request(PyObject * self, PyObject *args) {
+
+	async_schedule_to_req_green();
 
 	Py_DECREF(ugl.gl[uwsgi.wsgi_req->async_id]);
 
@@ -28,45 +36,66 @@ PyObject *py_uwsgi_greenlet_request(PyObject * self, PyObject *args) {
 
 PyMethodDef uwsgi_greenlet_request_method[] = {{"uwsgi_greenlet_request", py_uwsgi_greenlet_request, METH_VARARGS, ""}};
 
-static inline void greenlet_schedule_to_req() {
+static void greenlet_schedule_to_req() {
 
 	int id = uwsgi.wsgi_req->async_id;
+	uint8_t modifier1 = uwsgi.wsgi_req->uh->modifier1;
+
+        // ensure gil
+        UWSGI_GET_GIL
 
 	if (!uwsgi.wsgi_req->suspended) {
 		ugl.gl[id] = PyGreenlet_New(ugl.callable, NULL);
 		uwsgi.wsgi_req->suspended = 1;
 	}
 
+	// call it in the main core
+        if (uwsgi.p[modifier1]->suspend) {
+                uwsgi.p[modifier1]->suspend(NULL);
+        }
+
 	PyGreenlet_Switch(ugl.gl[id], NULL, NULL);
 
-	if (uwsgi.wsgi_req->suspended) {
-		uwsgi.wsgi_req->async_status = UWSGI_AGAIN;
-	}
+	if (uwsgi.p[modifier1]->resume) {
+                uwsgi.p[modifier1]->resume(NULL);
+        }
+
 
 }
 
-static inline void greenlet_schedule_to_main(struct wsgi_request *wsgi_req) {
+static void greenlet_schedule_to_main(struct wsgi_request *wsgi_req) {
 
+	// ensure gil
+        UWSGI_GET_GIL
+
+        if (uwsgi.p[wsgi_req->uh->modifier1]->suspend) {
+                uwsgi.p[wsgi_req->uh->modifier1]->suspend(wsgi_req);
+        }
 	PyGreenlet_Switch(ugl.main, NULL, NULL);
+        if (uwsgi.p[wsgi_req->uh->modifier1]->resume) {
+                uwsgi.p[wsgi_req->uh->modifier1]->resume(wsgi_req);
+        }
 	uwsgi.wsgi_req = wsgi_req;
 }
 
 
-static int greenlet_init() {
-	return 0;
-}
-
 static void greenlet_init_apps(void) {
 
-	if (!ugl.enabled) {
-		return;
-	}
+	if (!ugl.enabled) return;
 
 	if (uwsgi.async <= 1) {
-                uwsgi_log("the greenlet loop engine requires async mode\n");
+                uwsgi_log("the greenlet suspend engine requires async mode\n");
                 exit(1);
         }
 
+	if (uwsgi.has_threads) {
+                up.gil_get = gil_greenlet_get;
+                up.gil_release = gil_greenlet_release;
+        }
+
+        // blindy call it as the stackless gil engine is already set
+        UWSGI_GET_GIL
+
 
 	PyGreenlet_Import();
 
@@ -77,15 +106,11 @@ static void greenlet_init_apps(void) {
 
 	uwsgi.schedule_to_main = greenlet_schedule_to_main;
 	uwsgi.schedule_to_req = greenlet_schedule_to_req;
-
-	return;
-
 }
 
 struct uwsgi_plugin greenlet_plugin = {
 
 	.name = "greenlet",
-	.init = greenlet_init,
 	.init_apps = greenlet_init_apps,
 	.options = greenlet_options,
 };
diff --git a/plugins/python/wsgi_handlers.c b/plugins/python/wsgi_handlers.c
index 1fc870ba..c2b331c8 100644
--- a/plugins/python/wsgi_handlers.c
+++ b/plugins/python/wsgi_handlers.c
@@ -293,8 +293,9 @@ int uwsgi_request_wsgi(struct wsgi_request *wsgi_req) {
 
 	struct uwsgi_app *wi;
 
-	if (wsgi_req->async_status == UWSGI_AGAIN) {
+	if (wsgi_req->async_force_again) {
 		wi = &uwsgi_apps[wsgi_req->app_id];
+		wsgi_req->async_force_again = 0;
 		UWSGI_GET_GIL
 		// get rid of timeout
 		if (wsgi_req->async_timed_out) {
@@ -388,6 +389,7 @@ int uwsgi_request_wsgi(struct wsgi_request *wsgi_req) {
 		while (wi->response_subhandler(wsgi_req) != UWSGI_OK) {
 			if (uwsgi.async > 1) {
 				UWSGI_RELEASE_GIL
+				wsgi_req->async_force_again = 1;
 				return UWSGI_AGAIN;
 			}
 			else {
diff --git a/plugins/stackless/stackless.c b/plugins/stackless/stackless.c
index 498d0e98..ee81a447 100644
--- a/plugins/stackless/stackless.c
+++ b/plugins/stackless/stackless.c
@@ -84,6 +84,11 @@ static void stackless_init_apps(void) {
 
 	if (!usl.enabled) return;
 
+	if (uwsgi.async <= 1) {
+                uwsgi_log("the stackless suspend engine requires async mode\n");
+                exit(1);
+        }
+
 	if (uwsgi.has_threads) {
 		up.gil_get = gil_stackless_get;
         	up.gil_release = gil_stackless_release;