Initialize controller in two steps

There is a dependency cycle in the initialization order:
 - keyboard depends on controller
 - controller depends on acksync
 - acksync depends on keyboard initialization

To break this cycle, bind the async instance to the controller in a
second step.

PR #4473 <https://github.com/Genymobile/scrcpy/pull/4473>

app/src/controller.c

@@ -7,8 +7,7 @@
 #define SC_CONTROL_MSG_QUEUE_MAX 64
 
 bool
-sc_controller_init(struct sc_controller *controller, sc_socket control_socket,
-                   struct sc_acksync *acksync) {
+sc_controller_init(struct sc_controller *controller, sc_socket control_socket) {
     sc_vecdeque_init(&controller->queue);
 
     bool ok = sc_vecdeque_reserve(&controller->queue, SC_CONTROL_MSG_QUEUE_MAX);
@@ -16,7 +15,7 @@ sc_controller_init(struct sc_controller *controller, sc_socket control_socket,
         return false;
     }
 
-    ok = sc_receiver_init(&controller->receiver, control_socket, acksync);
+    ok = sc_receiver_init(&controller->receiver, control_socket);
     if (!ok) {
         sc_vecdeque_destroy(&controller->queue);
         return false;
@@ -43,6 +42,12 @@ sc_controller_init(struct sc_controller *controller, sc_socket control_socket,
     return true;
 }
 
+void
+sc_controller_set_acksync(struct sc_controller *controller,
+                          struct sc_acksync *acksync) {
+    controller->receiver.acksync = acksync;
+}
+
 void
 sc_controller_destroy(struct sc_controller *controller) {
     sc_cond_destroy(&controller->msg_cond);

app/src/controller.h

@@ -25,8 +25,11 @@ struct sc_controller {
 };
 
 bool
-sc_controller_init(struct sc_controller *controller, sc_socket control_socket,
-                   struct sc_acksync *acksync);
+sc_controller_init(struct sc_controller *controller, sc_socket control_socket);
+
+void
+sc_controller_set_acksync(struct sc_controller *controller,
+                          struct sc_acksync *acksync);
 
 void
 sc_controller_destroy(struct sc_controller *controller);

app/src/receiver.c

@@ -8,15 +8,14 @@
 #include "util/log.h"
 
 bool
-sc_receiver_init(struct sc_receiver *receiver, sc_socket control_socket,
-              struct sc_acksync *acksync) {
+sc_receiver_init(struct sc_receiver *receiver, sc_socket control_socket) {
     bool ok = sc_mutex_init(&receiver->mutex);
     if (!ok) {
         return false;
     }
 
     receiver->control_socket = control_socket;
-    receiver->acksync = acksync;
+    receiver->acksync = NULL;
 
     return true;
 }

app/src/receiver.h

@@ -20,8 +20,7 @@ struct sc_receiver {
 };
 
 bool
-sc_receiver_init(struct sc_receiver *receiver, sc_socket control_socket,
-                 struct sc_acksync *acksync);
+sc_receiver_init(struct sc_receiver *receiver, sc_socket control_socket);
 
 void
 sc_receiver_destroy(struct sc_receiver *receiver);

app/src/scrcpy.c

@@ -663,12 +663,13 @@ aoa_hid_end:
             mp = &s->mouse_sdk.mouse_processor;
         }
 
-        if (!sc_controller_init(&s->controller, s->server.control_socket,
-                                acksync)) {
+        if (!sc_controller_init(&s->controller, s->server.control_socket)) {
             goto end;
         }
         controller_initialized = true;
 
+        sc_controller_set_acksync(&s->controller, acksync);
+
         if (!sc_controller_start(&s->controller)) {
             goto end;
         }