Create a ThreadAttributes object having the default attribute values.
Declared in <bslmt_threadattributes.h>
ThreadAttributes();
The attributes are: * detachedState() == e_CREATE_JOINABLE * guardSize() == e_UNSET_GUARD_SIZE * inheritSchedule() == true * schedulingPolicy() == e_SCHED_DEFAULT * schedulingPriority() == e_UNSET_PRIORITY * stackSize() == e_UNSET_STACK_SIZE * threadName() == ""