From: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
To: qemu-devel@nongnu.org, pbonzini@redhat.com, ehabkost@redhat.com,
berrange@redhat.com, quintela@redhat.com
Subject: [Qemu-devel] [PATCH v2 1/5] rcu: Add automatically released rcu_read_lock variant
Date: Wed, 11 Sep 2019 20:06:18 +0100 [thread overview]
Message-ID: <20190911190622.7629-2-dgilbert@redhat.com> (raw)
In-Reply-To: <20190911190622.7629-1-dgilbert@redhat.com>
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
RCU_READ_LOCK_AUTO takes the rcu_read_lock and then uses glib's
g_auto infrastructure (and thus whatever the compiler's hooks are) to
release it on all exits of the block.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
include/qemu/rcu.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/qemu/rcu.h b/include/qemu/rcu.h
index 22876d1428..8768a7b60a 100644
--- a/include/qemu/rcu.h
+++ b/include/qemu/rcu.h
@@ -154,6 +154,24 @@ extern void call_rcu1(struct rcu_head *head, RCUCBFunc *func);
}), \
(RCUCBFunc *)g_free);
+typedef void RCUReadAuto;
+static inline RCUReadAuto *rcu_read_auto_lock(void)
+{
+ rcu_read_lock();
+ /* Anything non-NULL causes the cleanup function to be called */
+ return (void *)0x1;
+}
+
+static inline void rcu_read_auto_unlock(RCUReadAuto *r)
+{
+ rcu_read_unlock();
+}
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(RCUReadAuto, rcu_read_auto_unlock)
+
+#define RCU_READ_LOCK_AUTO \
+ g_autoptr(RCUReadAuto) _rcu_read_auto = rcu_read_auto_lock()
+
#ifdef __cplusplus
}
#endif
--
2.21.0
next prev parent reply other threads:[~2019-09-11 19:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 19:06 [Qemu-devel] [PATCH v2 0/5] Automatic RCU read unlock Dr. David Alan Gilbert (git)
2019-09-11 19:06 ` Dr. David Alan Gilbert (git) [this message]
2019-09-12 9:35 ` [Qemu-devel] [PATCH v2 1/5] rcu: Add automatically released rcu_read_lock variant Daniel P. Berrangé
2019-09-12 12:30 ` Paolo Bonzini
2019-09-12 17:45 ` Dr. David Alan Gilbert
2019-09-13 7:13 ` Paolo Bonzini
2019-09-13 10:24 ` Dr. David Alan Gilbert
2019-09-13 10:29 ` Paolo Bonzini
2019-09-11 19:06 ` [Qemu-devel] [PATCH v2 2/5] migration: Use automatic rcu_read unlock in ram.c Dr. David Alan Gilbert (git)
2019-09-12 9:37 ` Daniel P. Berrangé
2019-09-11 19:06 ` [Qemu-devel] [PATCH v2 3/5] migration: Use automatic rcu_read unlock in rdma.c Dr. David Alan Gilbert (git)
2019-09-12 9:37 ` Daniel P. Berrangé
2019-09-11 19:06 ` [Qemu-devel] [PATCH v2 4/5] rcu: Use automatic rc_read unlock in core memory/exec code Dr. David Alan Gilbert (git)
2019-09-12 9:38 ` Daniel P. Berrangé
2019-09-11 19:06 ` [Qemu-devel] [PATCH v2 5/5] migration: Missing rcu_read_unlock Dr. David Alan Gilbert (git)
2019-09-12 9:38 ` Daniel P. Berrangé
2019-09-12 12:32 ` Paolo Bonzini
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