prac 3 : deadlock simulation

Question 1

library required to create thread

Answer 1

<pthread.h>
</pthread.h>

Question 2

function to create thread,

Answer 2

step 1 : crate variable with thread datatype

ex pthread_t a;

pthread_create( & a , null thread_function, NULL)

1. &a : adddress of thread
2. null: default attribute
3. name of function which contains whatever the thread is supposed to do
4. null : input to this function. null implies nothing is passed to function

Question 3

what header file library provides access to system calls and low-level I/O operations

Answer 3

include<unistd.h></unistd.h>

Question 4

no of parameters to create thread in function and meaning of each

Answer 4

1. &a : adddress of thread
2. null: thread is going to acquire default attribute given by system
3. name of function which contains whatever the thread is supposed to do
4. null : input to this function. null implies nothing is passed to function

Question 5

how to initialize thread :

Answer 5

pthread_t thread_name;

Question 6

What function is used to wait for thread to finish ?

Answer 6

pthread_t a;
pthread_join(a, NULL)

a : the thread for which you want to wait
Null : this parameter tells just in case you want thread to return something, here means we want it to return nothing

Question 7

what to include while running thread program in terminal

Answer 7

gcc prog_name.c -lpthread

Question 8

how do we prototype thread function

Answer 8

void * thread_function (void * arg)

Question 9

How to declare variable that is used for locking or unlocking ?

Answer 9

pthread_mutex_t

Question 10

how to initialise variable declared for locking

Answer 10

pthread_mutex_init()

Question 11

when thread wants to enter critical section what will it acquire to variable

Answer 11

pthread_mutex_lock()

Question 12

when thread wants to go out of critical section what will it acquire to variable

Answer 12

pthread_mutex_unlock()