Fix multithread issues when operating on a single shared file

[fio.git] / backend.c

diff --git a/backend.c b/backend.c
index e5bb4e259034b29af86fbaed018ae64c7bb288db..3a99850db1f5659b78bf8616521c6f84af1a38dd 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -2314,8 +2314,25 @@ static void run_threads(struct sk_out *sk_out)
        for_each_td(td, i) {
                print_status_init(td->thread_number - 1);
 
-               if (!td->o.create_serialize)
+               if (!td->o.create_serialize) {
+                       /*
+                        *  When operating on a single rile in parallel,
+                        *  perform single-threaded early setup so that
+                        *  when setup_files() does not run into issues
+                        *  later.
+                       */
+                       if (!i && td->o.nr_files==1) {
+                               if (setup_shared_file(td)) {
+                                       exit_value++;
+                                       if (td->error)
+                                               log_err("fio: pid=%d, err=%d/%s\n",
+                                                       (int) td->pid, td->error, td->verror);
+                                       td_set_runstate(td, TD_REAPED);
+                                       todo--;
+                               }
+                       }
                        continue;
+               }
 
                if (fio_verify_load_state(td))
                        goto reap;