[PATCH v3 3/5] migration: Don't wait in semaphore for thread we know has finished

[Juan Quintela <quintela@redhat.com>]

If p->quit is true for any channel, we know that it has finished for
any reason.  So don't wait for it, just continue.

Signed-off-by: Juan Quintela <quintela@redhat.com>

---

I could be convinced that the right thing to do in that case is to
just do a break instead of a continue.  Each option has its own
advantages/disadvantanges.
---
 migration/ram.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 44ca56e1ea..bc918ef28d 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1118,6 +1118,12 @@ static void multifd_send_sync_main(RAMState *rs)
         MultiFDSendParams *p = &multifd_send_state->params[i];
 
         trace_multifd_send_sync_main_wait(p->id);
+        qemu_mutex_lock(&p->mutex);
+        if (p->quit) {
+            qemu_mutex_unlock(&p->mutex);
+            continue;
+        }
+        qemu_mutex_unlock(&p->mutex);
         qemu_sem_wait(&p->sem_sync);
     }
     trace_multifd_send_sync_main(multifd_send_state->packet_num);
-- 
2.24.1