From 0b7588a7bbbcf6cf1b3d06b1df2ff4c7e9d5ca37 Mon Sep 17 00:00:00 2001
From: aliguori <aliguori>
Date: Mon, 22 Sep 2008 14:49:01 +0000
Subject: [PATCH] Do not allow AIO to be inited multiple times

This prevents two signalfd() threads from being spawned.  This problem was
originally spotted by Blue Swirl.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
 block-raw-posix.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block-raw-posix.c b/block-raw-posix.c
index c78d73f31b..dcd42fe7d5 100644
--- a/block-raw-posix.c
+++ b/block-raw-posix.c
@@ -511,6 +511,9 @@ void qemu_aio_init(void)
 {
     sigset_t mask;
 
+    if (aio_initialized)
+        return;
+
     aio_initialized = 1;
 
     /* Make sure to block AIO signal */
-- 
2.11.4.GIT