[dpdk-stable] [PATCH v4] telemetry: fix race in telemetry control thread creation

[Alvin Zhang <alvinx.zhang@intel.com>]

Before the caller returns from function "rte_ctrl_thread_create",
the newly created thread may have ran, and because the thread
control flag was not set before, the new thread may exit soon.
This is not what the developer expected.

This patch puts the setting thread control flag to the place that
before creating new thread.

Reported-at: https://bugs.dpdk.org/show_bug.cgi?id=731
Fixes: 8877ac688b52 ("telemetry: introduce infrastructure")
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---

v2, v3: update commit log
v4: update email address
---
 lib/librte_telemetry/rte_telemetry.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_telemetry/rte_telemetry.c b/lib/librte_telemetry/rte_telemetry.c
index eb20cc6..98d5f91 100644
--- a/lib/librte_telemetry/rte_telemetry.c
+++ b/lib/librte_telemetry/rte_telemetry.c
@@ -1005,10 +1005,10 @@ struct json_data {
 	}
 	TAILQ_INIT(&static_telemetry->client_list_head);
 
+	static_telemetry->thread_status = 1;
 	ret = rte_ctrl_thread_create(&static_telemetry->thread_id,
 		telemetry_ctrl_thread, &attr, rte_telemetry_run_thread_func,
 		(void *)static_telemetry);
-	static_telemetry->thread_status = 1;
 
 	if (ret < 0) {
 		ret = rte_telemetry_cleanup();
-- 
1.8.3.1