[PATCH v2 18/21] tests: fixes aio-win32 about aio_remove_fd_handler, get it consistence with aio-posix.c

[Yonggang Luo <luoyonggang@gmail.com>]

This is a fixes for
(C:\work\xemu\qemu\build\tests\test-aio-multithread.exe:19100): GLib-CRITICAL **: 23:03:24.965: g_source_remove_poll: assertion '!SOURCE_DESTROYED (source)' failed
ERROR test-aio-multithread - Bail out! GLib-FATAL-CRITICAL: g_source_remove_poll: assertion '!SOURCE_DESTROYED (source)' failed

(C:\work\xemu\qemu\build\tests\test-bdrv-drain.exe:21036): GLib-CRITICAL **: 23:03:29.861: g_source_remove_poll: assertion '!SOURCE_DESTROYED (source)' failed
ERROR test-bdrv-drain - Bail out! GLib-FATAL-CRITICAL: g_source_remove_poll: assertion '!SOURCE_DESTROYED (source)' failed

And the idea comes from https://patchwork.kernel.org/patch/9975239/

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
---
 util/aio-win32.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/util/aio-win32.c b/util/aio-win32.c
index 953c56ab48..9899546a8a 100644
--- a/util/aio-win32.c
+++ b/util/aio-win32.c
@@ -37,6 +37,15 @@ struct AioHandler {
 
 static void aio_remove_fd_handler(AioContext *ctx, AioHandler *node)
 {
+    /* If the GSource is in the process of being destroyed then
+     * g_source_remove_poll() causes an assertion failure.  Skip
+     * removal in that case, because glib cleans up its state during
+     * destruction anyway.
+     */
+    if (!g_source_is_destroyed(&ctx->source)) {
+        g_source_remove_poll(&ctx->source, &node->pfd);
+    }
+
     /* If aio_poll is in progress, just mark the node as deleted */
     if (qemu_lockcnt_count(&ctx->list_lock)) {
         node->deleted = 1;
@@ -139,8 +148,6 @@ void aio_set_event_notifier(AioContext *ctx,
     /* Are we deleting the fd handler? */
     if (!io_notify) {
         if (node) {
-            g_source_remove_poll(&ctx->source, &node->pfd);
-
             aio_remove_fd_handler(ctx, node);
         }
     } else {
-- 
2.28.0.windows.1