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bool update_sys_var_str(sys_var_str *var_str, pthread_rwlock_t *var_mutex,
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char *res= 0, *old_value=(char *)(var ? var->value->str_value.ptr() : 0);
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uint32_t new_length= (var ? var->value->str_value.length() : 0);
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Replace the old value in such a way that the any thread using