pthread_key_create = 0
pthread_setspecific = 0
pthread_getspecific = 123
valid pthread_setspecific for value NULL = 0
pthread_getspecific = 0
pthread_getspecific after key recreate = 0
pthread_key_delete = 0
pthread_key_delete repeated = 28
pthread_setspecific for value NULL = 28
pthread_key_delete just after created = 0