Donny9 commented on a change in pull request #4270:
URL: https://github.com/apache/incubator-nuttx/pull/4270#discussion_r681473001



##########
File path: libs/libc/time/lib_localtime.c
##########
@@ -2528,9 +2537,20 @@ void tzset(void)
 {
   FAR const char *name;
 
-  tz_semtake(&g_lcl_sem);
-
   name = getenv("TZ");
+  if (g_lcl_isset > 0 && name && strcmp(g_lcl_tzname, name) == 0)
+    {
+      return;
+    }

Review comment:
       > required
   
   Because we use global var(g_lcl_isset and g_lcl_tzname) without taking 
semaphore, and when we access them again, they have changed, so we need this 
condition again.




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