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From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Wed, 25 Dec 2024 14:44:17 +0900
Subject: [PATCH 5/8] qemu-thread: Use futex if available for QemuLockCnt
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To: Paolo Bonzini <pbonzini@redhat.com>, Stefan Weil <sw@weilnetz.de>,
Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>,
Hailiang Zhang <zhanghailiang@xfusion.com>
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This unlocks the futex-based implementation of QemuLockCnt to Windows.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
include/qemu/lockcnt.h | 2 +-
util/lockcnt.c | 7 ++++---
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/include/qemu/lockcnt.h b/include/qemu/lockcnt.h
index f4b62a3f7011..5a2800e3f182 100644
--- a/include/qemu/lockcnt.h
+++ b/include/qemu/lockcnt.h
@@ -17,7 +17,7 @@
typedef struct QemuLockCnt QemuLockCnt;
=20
struct QemuLockCnt {
-#ifndef CONFIG_LINUX
+#ifndef HAVE_FUTEX
QemuMutex mutex;
#endif
unsigned count;
diff --git a/util/lockcnt.c b/util/lockcnt.c
index ca27d8e61a5c..92c9f8ceca88 100644
--- a/util/lockcnt.c
+++ b/util/lockcnt.c
@@ -12,10 +12,11 @@
#include "qemu/atomic.h"
#include "trace.h"
=20
-#ifdef CONFIG_LINUX
-#include "qemu/futex.h"
+#ifdef HAVE_FUTEX
=20
-/* On Linux, bits 0-1 are a futex-based lock, bits 2-31 are the counter.
+/*
+ * When futex is available, bits 0-1 are a futex-based lock, bits 2-31 are=
the
+ * counter.
* For the mutex algorithm see Ulrich Drepper's "Futexes Are Tricky" (ok,
* this is not the most relaxing citation I could make...). It is similar
* to mutex2 in the paper.
--=20
2.47.1