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[v9,6/8] io: Document qmp oob suitability of qio_channel_shutdown and io_shutdown

Message ID 10e56f6d30fca6dcb75c0be8ed605bbbe2b0fec7.1603909658.git.lukasstraub2@web.de
State New, archived
Headers show
Series Introduce 'yank' oob qmp command to recover from hanging qemu | expand

Commit Message

Lukas Straub Oct. 28, 2020, 6:45 p.m. UTC
Migration and yank code assume that qio_channel_shutdown is thread
-safe and can be called from qmp oob handler. Document this after
checking the code.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 include/io/channel.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--
2.20.1
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Patch

diff --git a/include/io/channel.h b/include/io/channel.h
index 3c04f0edda..e0b9fc615d 100644
--- a/include/io/channel.h
+++ b/include/io/channel.h
@@ -92,7 +92,8 @@  struct QIOChannel {
  * provide additional optional features.
  *
  * Consult the corresponding public API docs for a description
- * of the semantics of each callback
+ * of the semantics of each callback. io_shutdown in particular
+ * must be thread-safe, terminate quickly and must not block.
  */
 struct QIOChannelClass {
     ObjectClass parent;
@@ -510,6 +511,8 @@  int qio_channel_close(QIOChannel *ioc,
  * QIO_CHANNEL_FEATURE_SHUTDOWN prior to calling
  * this method.
  *
+ * This function is thread-safe, terminates quickly and does not block.
+ *
  * Returns: 0 on success, -1 on error
  */
 int qio_channel_shutdown(QIOChannel *ioc,