[PATCH v4 05/12] aio: remove aio_context_use_g_source()

[Stefan Hajnoczi <stefanha@redhat.com>]

There is no need for aio_context_use_g_source() now that epoll(7) and
io_uring(7) file descriptor monitoring works with the glib event loop.
AioContext doesn't need to be notified that GSource is being used.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 include/block/aio.h               |  3 ---
 tests/unit/test-nested-aio-poll.c |  6 ------
 util/aio-posix.c                  | 12 ------------
 util/aio-win32.c                  |  4 ----
 util/async.c                      |  1 -
 5 files changed, 26 deletions(-)

diff --git a/include/block/aio.h b/include/block/aio.h
index 39ed86d14d..1657740a0e 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -728,9 +728,6 @@ void aio_context_setup(AioContext *ctx);
  */
 void aio_context_destroy(AioContext *ctx);
 
-/* Used internally, do not call outside AioContext code */
-void aio_context_use_g_source(AioContext *ctx);
-
 /**
  * aio_context_set_poll_params:
  * @ctx: the aio context
diff --git a/tests/unit/test-nested-aio-poll.c b/tests/unit/test-nested-aio-poll.c
index 45484e745b..d13ecccd8c 100644
--- a/tests/unit/test-nested-aio-poll.c
+++ b/tests/unit/test-nested-aio-poll.c
@@ -83,12 +83,6 @@ static void test(void)
     /* Enable polling */
     aio_context_set_poll_params(td.ctx, 1000000, 2, 2, &error_abort);
 
-    /*
-     * The GSource is unused but this has the side-effect of changing the fdmon
-     * that AioContext uses.
-     */
-    aio_get_g_source(td.ctx);
-
     /* Make the event notifier active (set) right away */
     event_notifier_init(&td.poll_notifier, 1);
     aio_set_event_notifier(td.ctx, &td.poll_notifier,
diff --git a/util/aio-posix.c b/util/aio-posix.c
index 9de05ee7e8..bebd9ce3a2 100644
--- a/util/aio-posix.c
+++ b/util/aio-posix.c
@@ -743,18 +743,6 @@ void aio_context_destroy(AioContext *ctx)
     aio_free_deleted_handlers(ctx);
 }
 
-void aio_context_use_g_source(AioContext *ctx)
-{
-    /*
-     * Disable io_uring when the glib main loop is used because it doesn't
-     * support mixed glib/aio_poll() usage. It relies on aio_poll() being
-     * called regularly so that changes to the monitored file descriptors are
-     * submitted, otherwise a list of pending fd handlers builds up.
-     */
-    fdmon_io_uring_destroy(ctx);
-    aio_free_deleted_handlers(ctx);
-}
-
 void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
                                  int64_t grow, int64_t shrink, Error **errp)
 {
diff --git a/util/aio-win32.c b/util/aio-win32.c
index 6583d5c5f3..34c4074133 100644
--- a/util/aio-win32.c
+++ b/util/aio-win32.c
@@ -427,10 +427,6 @@ void aio_context_destroy(AioContext *ctx)
 {
 }
 
-void aio_context_use_g_source(AioContext *ctx)
-{
-}
-
 void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns,
                                  int64_t grow, int64_t shrink, Error **errp)
 {
diff --git a/util/async.c b/util/async.c
index 2719c629ae..a39410d675 100644
--- a/util/async.c
+++ b/util/async.c
@@ -430,7 +430,6 @@ static GSourceFuncs aio_source_funcs = {
 
 GSource *aio_get_g_source(AioContext *ctx)
 {
-    aio_context_use_g_source(ctx);
     g_source_ref(&ctx->source);
     return &ctx->source;
 }
-- 
2.51.0