[Qemu-devel] [RFC PATCH 10/17] COLO ctl: introduce is_slave() and is_master()

[Yang Hongyang]

is_slaver is to determine whether the QEMU instance is a
slaver(migration target) at runtime.
is_master is to determine whether the QEMU instance is a
master(migration starter) at runtime.
This 2 APIs will be used later.

Signed-off-by: Yang Hongyang <address@hidden>
---
 migration-colo.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/migration-colo.c b/migration-colo.c
index 802f8b0..2699e77 100644
--- a/migration-colo.c
+++ b/migration-colo.c
@@ -187,6 +187,12 @@ static const QEMUFileOps colo_read_ops = {
 
 /* save */
 
+static __attribute__((unused)) bool is_master(void)
+{
+    MigrationState *s = migrate_get_current();
+    return (s->state == MIG_STATE_COLO);
+}
+
 static void *colo_thread(void *opaque)
 {
     MigrationState *s = opaque;
@@ -275,6 +281,11 @@ void colo_init_checkpointer(MigrationState *s)
 
 static Coroutine *colo;
 
+static __attribute__((unused)) bool is_slave(void)
+{
+    return colo != NULL;
+}
+
 /*
  * return:
  * 0: start a checkpoint
-- 
1.9.1