New upstream version 17.11.3

[deb_dpdk.git] / lib / librte_vhost / fd_man.c

diff --git a/lib/librte_vhost/fd_man.c b/lib/librte_vhost/fd_man.c
index 4c6fed4..173ec75 100644 (file)
--- a/lib/librte_vhost/fd_man.c
+++ b/lib/librte_vhost/fd_man.c
@@ -200,6 +200,38 @@ fdset_del(struct fdset *pfdset, int fd)
        return dat;
 }
 
+/**
+ *  Unregister the fd from the fdset.
+ *
+ *  If parameters are invalid, return directly -2.
+ *  And check whether fd is busy, if yes, return -1.
+ *  Otherwise, try to delete the fd from fdset and
+ *  return true.
+ */
+int
+fdset_try_del(struct fdset *pfdset, int fd)
+{
+       int i;
+
+       if (pfdset == NULL || fd == -1)
+               return -2;
+
+       pthread_mutex_lock(&pfdset->fd_mutex);
+       i = fdset_find_fd(pfdset, fd);
+       if (i != -1 && pfdset->fd[i].busy) {
+               pthread_mutex_unlock(&pfdset->fd_mutex);
+               return -1;
+       }
+
+       if (i != -1) {
+               pfdset->fd[i].fd = -1;
+               pfdset->fd[i].rcb = pfdset->fd[i].wcb = NULL;
+               pfdset->fd[i].dat = NULL;
+       }
+
+       pthread_mutex_unlock(&pfdset->fd_mutex);
+       return 0;
+}
 
 /**
  * This functions runs in infinite blocking loop until there is no fd in