pthread_key_create = 0
pthread_setspecific = 0
pthread_getspecific = 123
valid pthread_setspecific for value NULL = 0
pthread_getspecific = (nil)
pthread_getspecific after key recreate = (nil)
pthread_key_delete = 0
pthread_key_delete repeated = 22
pthread_setspecific for value NULL = 22
pthread_key_delete just after created = 0