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From: wanghonghao <wanghonghao@bytedance.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, pbonzini@redhat.com, fam@euphon.net,
	wanghonghao <wanghonghao@bytedance.com>,
	stefanha@redhat.com
Subject: [PATCH 1/2] QSLIST: add atomic replace operation
Date: Mon, 24 Aug 2020 12:31:20 +0800	[thread overview]
Message-ID: <20200824043121.13421-1-wanghonghao@bytedance.com> (raw)

Replace a queue with another atomicly. It's useful when we need to transfer
queues between threads.

Signed-off-by: wanghonghao <wanghonghao@bytedance.com>
---
 include/qemu/queue.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index 456a5b01ee..a3ff544193 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -226,6 +226,10 @@ struct {                                                                \
         (dest)->slh_first = atomic_xchg(&(src)->slh_first, NULL);        \
 } while (/*CONSTCOND*/0)
 
+#define QSLIST_REPLACE_ATOMIC(dest, src) do {                                 \
+        (src)->slh_first = atomic_xchg(&(dest)->slh_first, (src)->slh_first); \
+} while (/*CONSTCOND*/0)
+
 #define QSLIST_REMOVE_HEAD(head, field) do {                             \
         typeof((head)->slh_first) elm = (head)->slh_first;               \
         (head)->slh_first = elm->field.sle_next;                         \
-- 
2.24.3 (Apple Git-128)



             reply	other threads:[~2020-08-24  4:32 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-24  4:31 wanghonghao [this message]
2020-08-24  4:31 ` [PATCH 2/2] coroutine: take exactly one batch from global pool at a time wanghonghao
2020-08-25 14:52   ` Stefan Hajnoczi
2020-08-26  6:06     ` [External] " 王洪浩
2020-09-29  3:24       ` PING: " 王洪浩
2020-10-13 10:04         ` Stefan Hajnoczi
2020-08-24 15:26 ` [PATCH 1/2] QSLIST: add atomic replace operation Stefan Hajnoczi
2020-08-25  3:33   ` [External] " 王洪浩
2020-08-25  3:37   ` [PATCH v2 " wanghonghao
2020-08-25  3:37     ` [PATCH v2 2/2] coroutine: take exactly one batch from global pool at a time wanghonghao
  -- strict thread matches above, loose matches on Subject: below --
2020-08-13  4:44 [PATCH 1/2] QSLIST: add atomic replace operation wanghonghao

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