From e9e6295b28b331762e67d466f77ba07a349edbbc Mon Sep 17 00:00:00 2001
From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Date: Thu, 3 Nov 2011 16:57:26 +0800
Subject: CoQueue: introduce qemu_co_queue_wait_insert_head

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qemu-coroutine-lock.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'qemu-coroutine-lock.c')

diff --git a/qemu-coroutine-lock.c b/qemu-coroutine-lock.c
index 6b58160058..9549c075ee 100644
--- a/qemu-coroutine-lock.c
+++ b/qemu-coroutine-lock.c
@@ -61,6 +61,14 @@ void coroutine_fn qemu_co_queue_wait(CoQueue *queue)
     assert(qemu_in_coroutine());
 }
 
+void coroutine_fn qemu_co_queue_wait_insert_head(CoQueue *queue)
+{
+    Coroutine *self = qemu_coroutine_self();
+    QTAILQ_INSERT_HEAD(&queue->entries, self, co_queue_next);
+    qemu_coroutine_yield();
+    assert(qemu_in_coroutine());
+}
+
 bool qemu_co_queue_next(CoQueue *queue)
 {
     Coroutine *next;
-- 
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