local: server accept should wait client connect done

server:
at accept last nxsem_post(&client->lc_waitsem);

client:
connect wait(&client->lc_waitsem) then local_open_client_rx();

But if the server priority is higher then client,
and after server accept return, immediately call send().
At this time the client has no way do local_open_client_rx().
Then server send() return error.

Fix:
add lc_done sem to client

Signed-off-by: ligd <liguiding1@xiaomi.com>

net/local/local.h

@@ -145,6 +145,7 @@ struct local_conn_s
   /* SOCK_STREAM fields common to both client and server */
 
   sem_t lc_waitsem;            /* Use to wait for a connection to be accepted */
+  sem_t lc_donesem;            /* Use to wait for client connected done */
   FAR struct socket *lc_psock; /* A reference to the socket structure */
 
   /* The following is a list if poll structures of threads waiting for

net/local/local_accept.c

@@ -243,6 +243,12 @@ int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
             }
 
           nxsem_post(&client->lc_waitsem);
+
+          if (ret == OK)
+            {
+              ret = net_lockedwait(&client->lc_donesem);
+            }
+
           return ret;
         }
 

net/local/local_conn.c

@@ -124,6 +124,10 @@ FAR struct local_conn_s *local_alloc(void)
 
       nxsem_init(&conn->lc_waitsem, 0, 0);
       nxsem_set_protocol(&conn->lc_waitsem, SEM_PRIO_NONE);
+
+      nxsem_init(&conn->lc_donesem, 0, 0);
+      nxsem_set_protocol(&conn->lc_donesem, SEM_PRIO_NONE);
+
 #endif
 
       /* Add the connection structure to the list of listeners */
@@ -203,6 +207,7 @@ void local_free(FAR struct local_conn_s *conn)
 
   local_release_fifos(conn);
   nxsem_destroy(&conn->lc_waitsem);
+  nxsem_destroy(&conn->lc_donesem);
 #endif
 
   /* And free the connection structure */

net/local/local_connect.c

@@ -178,6 +178,8 @@ static int inline local_stream_connect(FAR struct local_conn_s *client,
 
   DEBUGASSERT(client->lc_infile.f_inode != NULL);
 
+  nxsem_post(&client->lc_donesem);
+
   if (!nonblock)
     {
       client->lc_state = LOCAL_STATE_CONNECTED;