From 6eb5733a3cad93b00043d48fa22b9df7d1f5ab33 Mon Sep 17 00:00:00 2001
From: bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sun, 6 Aug 2006 09:51:25 +0000
Subject: [PATCH] fixed blocking io emulation

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2090 c046a42c-6fe2-441c-8c8c-71466251a162
---
 block-raw.c | 5 +++++
 vl.c        | 6 +++++-
 vl.h        | 2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/block-raw.c b/block-raw.c
index 14f4bd5b3c..adb3d39add 100644
--- a/block-raw.c
+++ b/block-raw.c
@@ -308,6 +308,11 @@ void qemu_aio_wait(void)
 {
     sigset_t set;
     int nb_sigs;
+
+#ifndef QEMU_TOOL
+    if (qemu_bh_poll())
+        return;
+#endif
     sigemptyset(&set);
     sigaddset(&set, aio_sig_num);
     sigwait(&set, &nb_sigs);
diff --git a/vl.c b/vl.c
index 6daed966b1..0504c6f199 100644
--- a/vl.c
+++ b/vl.c
@@ -5200,19 +5200,23 @@ QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
     return bh;
 }
 
-void qemu_bh_poll(void)
+int qemu_bh_poll(void)
 {
     QEMUBH *bh, **pbh;
+    int ret;
 
+    ret = 0;
     for(;;) {
         pbh = &first_bh;
         bh = *pbh;
         if (!bh)
             break;
+        ret = 1;
         *pbh = bh->next;
         bh->scheduled = 0;
         bh->cb(bh->opaque);
     }
+    return ret;
 }
 
 void qemu_bh_schedule(QEMUBH *bh)
diff --git a/vl.h b/vl.h
index f717424631..ce52fb8260 100644
--- a/vl.h
+++ b/vl.h
@@ -495,7 +495,7 @@ QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
 void qemu_bh_schedule(QEMUBH *bh);
 void qemu_bh_cancel(QEMUBH *bh);
 void qemu_bh_delete(QEMUBH *bh);
-void qemu_bh_poll(void);
+int qemu_bh_poll(void);
 
 /* block.c */
 typedef struct BlockDriverState BlockDriverState;