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monitor: more comments on lock-free elements 

Add some explicit comments for both Readline and cpu_set/cpu_get helpers
that they do not need the mon_lock protection.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180608035511.7439-4-peterx@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Peter Xu 2018-06-08 11:55:07 +08:00 committed by Markus Armbruster
parent 9409fc05fe
commit d9f252809e
1 changed files with 10 additions and 1 deletions
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11
monitor.c
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@ -206,7 +206,15 @@ 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;
@ -1311,7 +1319,7 @@ 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;
@ -1325,6 +1333,7 @@ int monitor_set_cpu(int cpu_index)
return 0;
}
/* Callers must hold BQL. */
static CPUState *mon_get_cpu_sync(bool synchronize)
{
CPUState *cpu;