[PATCH V2 2/4] iothread: Introduce a new flag to show iothreads attached status

[Zhang Chen <zhangckid@gmail.com>]

QEMU Need a flag to show current iothread attached status
when hotplug multi iothreads. For example virtio-blk.

Signed-off-by: Zhang Chen <zhangckid@gmail.com>
---
 include/system/iothread.h | 1 +
 iothread.c                | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/system/iothread.h b/include/system/iothread.h
index e26d13c6c7..3d00474523 100644
--- a/include/system/iothread.h
+++ b/include/system/iothread.h
@@ -32,6 +32,7 @@ struct IOThread {
     QemuSemaphore init_done_sem; /* is thread init done? */
     bool stopping;              /* has iothread_stop() been called? */
     bool running;               /* should iothread_run() continue? */
+    bool attached;              /* Whether or not attached to device */
     int thread_id;
 
     /* AioContext poll parameters */
diff --git a/iothread.c b/iothread.c
index caf68e0764..38e38fb44d 100644
--- a/iothread.c
+++ b/iothread.c
@@ -94,6 +94,7 @@ void iothread_stop(IOThread *iothread)
         return;
     }
     iothread->stopping = true;
+    iothread->attached = false;
     aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread);
     qemu_thread_join(&iothread->thread);
 }
@@ -199,6 +200,9 @@ static void iothread_init(EventLoopBase *base, Error **errp)
      */
     iothread_init_gcontext(iothread, thread_name);
 
+    /* Clear iothread attached flag for init gcontext */
+    iothread->attached = false;
+
     iothread_set_aio_context_params(base, &local_error);
     if (local_error) {
         error_propagate(errp, local_error);
@@ -336,6 +340,7 @@ char *iothread_get_id(IOThread *iothread)
 
 AioContext *iothread_get_aio_context(IOThread *iothread)
 {
+    iothread->attached = true;
     return iothread->ctx;
 }
 
-- 
2.49.0