Notes

According to my understanding of the code written in C for creating a new Thread is that in main method it uses a system call to load the dependencies by including <pthread.h> library. In this library there is a method named pthread_create() which takes several arguments including the thread ID which is of type int reperesented by pthread_t in the header file. A function to call the subroutine.

int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg);


here the pthread_attr_t reperesents the attributes which are used at thread creation time and if the argument is NULL then the default attribute are specified for thread creation.

the pthread_create() method returns an integer number if it returns 0 then the thread creation is successful otherwise and error code will be return.

In our case the thread creation was successful so the function return the status code of 0 and two threads were created with default attributes.


Thread Synchronization:

According to the documentation provided in the lab manual. Thread in C provides three sorts of synchronization mechanisms
-> Mutual Exclusion Lock (mutex)
-> Joins
-> Condition Variables