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[Qemu-devel] [PATCH v8 3/5] monitor: more comments on lock-free elements
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v8 3/5] monitor: more comments on lock-free elements |
Date: |
Mon, 28 May 2018 15:19:56 +0800 |
Add some explicit comments for both Readline and cpu_set/cpu_get helpers
that they do not need the mon_lock protection.
Signed-off-by: Peter Xu <address@hidden>
---
monitor.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/monitor.c b/monitor.c
index d6c3c08932..f23178951e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -207,7 +207,15 @@ struct Monitor {
int suspend_cnt; /* Needs to be accessed atomically */
bool skip_flush;
bool use_io_thr;
+
+ /*
+ * State used only in the thread "owning" the monitor.
+ * If @use_io_thr, this is mon_global.mon_iothread.
+ * Else, it's the main thread.
+ * These members can be safely accessed without locks.
+ */
ReadLineState *rs;
+
MonitorQMP qmp;
gchar *mon_cpu_path;
BlockCompletionFunc *password_completion_cb;
@@ -1313,7 +1321,7 @@ void qmp_qmp_capabilities(bool has_enable,
QMPCapabilityList *enable,
cur_mon->qmp.commands = &qmp_commands;
}
-/* set the current CPU defined by the user */
+/* Set the current CPU defined by the user. Callers must hold BQL. */
int monitor_set_cpu(int cpu_index)
{
CPUState *cpu;
@@ -1327,6 +1335,7 @@ int monitor_set_cpu(int cpu_index)
return 0;
}
+/* Callers must hold BQL. */
static CPUState *mon_get_cpu_sync(bool synchronize)
{
CPUState *cpu;
--
2.17.0