Fix resumed_coroutines assertion: add ZEND_ASYNC_REACTOR_TICK and remove io_close reactor tick

- Implement async_reactor_tick() in scheduler.c: sets scheduler context,
  executes reactor (no-wait), restores context, drains resumed_coroutines.
- Register it as zend_async_reactor_tick_fn during scheduler startup.
- Remove the manual reactor tick from libuv_io_close — the uv_close
  callback will be processed during the next regular reactor tick.

Author: EdmondDantes

libuv_reactor.c

@@ -3862,7 +3862,6 @@ static bool libuv_io_close(zend_async_io_t *io_base)
 	}
 
 	io->base.state |= ZEND_ASYNC_IO_CLOSED;
-	bool need_close_handle = false;
 
 	/* If the reactor is already shut down (e.g. bailout during memory
 	 * exhaustion followed by executor_globals_dtor), skip libuv calls. */
@@ -3875,12 +3874,10 @@ static bool libuv_io_close(zend_async_io_t *io_base)
 		io->handle.stream.data = io;
 		ZEND_ASYNC_EVENT_ADD_REF(&io->base.event);
 		uv_close((uv_handle_t *) &io->handle.stream, io_close_cb);
-		need_close_handle = true;
 	} else if (io->base.type == ZEND_ASYNC_IO_TYPE_UDP) {
 		io->handle.udp.data = io;
 		ZEND_ASYNC_EVENT_ADD_REF(&io->base.event);
 		uv_close((uv_handle_t *) &io->handle.udp, io_close_cb);
-		need_close_handle = true;
 	}
 	/* FILE type: no uv handle to close. */
 
@@ -3896,12 +3893,6 @@ static bool libuv_io_close(zend_async_io_t *io_base)
 	}
 	io->orig_fd = -1;
 
-	if (need_close_handle && false == ZEND_ASYNC_IS_SCHEDULER_CONTEXT) {
-		ZEND_ASYNC_SCHEDULER_CONTEXT = true;
-		libuv_reactor_execute(true);
-		ZEND_ASYNC_SCHEDULER_CONTEXT = false;
-	}
-
 	return true;
 }
 

scheduler.c

@@ -86,8 +86,22 @@ static void fiber_context_cleanup(zend_fiber_context *context);
 /// MODULE INIT/SHUTDOWN
 ///////////////////////////////////////////////////////////
 
+static zend_always_inline void process_resumed_coroutines(void);
+
+static void async_reactor_tick(void)
+{
+	ZEND_ASYNC_SCHEDULER_CONTEXT = true;
+	ZEND_ASYNC_REACTOR_EXECUTE(true);
+	ZEND_ASYNC_SCHEDULER_CONTEXT = false;
+
+	if (circular_buffer_is_not_empty(&ASYNC_G(resumed_coroutines))) {
+		process_resumed_coroutines();
+	}
+}
+
 void async_scheduler_startup(void)
 {
+	zend_async_reactor_tick_fn = async_reactor_tick;
 }
 
 void async_scheduler_shutdown(void)