chapter 27: Thread API

Question 1

Thread creation

Answer 1

pthread_create()

Question 2

what does pthread_join() do?

Answer 2

waits for a thread to complete

Question 3

what is the type of thread?

Answer 3

pthread_t

Question 4

what are the function for locks?

Answer 4

int pthread_mutex_lock(pthread_mutex_t *mutex)
int pthread_mutex_unlock(pthread_mutex_t *mutex)

init
pthread_mutex_t = PTHREAD_MUTEX_INITIALIZER;
or
int rc = pthread_mutex_init(&lock, NULL);
rc == 0 if success

Question 5

what are timedlocks and trylocks?

Answer 5

int pthread_mutex_trylock(pthread_mutex_t *mutex);
trylock returns failure if lock is already held

int pthread_mutex_timedlock(pthread_mutex_t *mutex, time);
after acquiring a lock. returns after a timeout or finish acquiring a lock. whichever comes first.

Question 6

what are the functions for Condition Variables?

Answer 6

int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);
int pthread_cond_signal(pthread_cond_t *cond);
note: wait takes cv and mutex. singal only takes cv.

pthread_cond_t cond = PTHREAD_COND_INITIALIZER