Pthreads, Operating System

Assignment Help:

A thread is defined as an independent stream of instructions that can be scheduled to run as such by the operating system. Each program contains a number of threads which can be running in parallel.

The program  intro.c is a demonstration of using  pthread_create(thread,attr,start_routine,arg) function to create a new thread. The parameter thread is used as a way to pass variable between the main programs to the thread. The  attr parameter is used to set the thread attributes, which is usually set to NULL. The start_routine parameter is the C routine being executed when the thread starts. The arg parameter is the argument passed to the routine.

A thread is terminated using the function pthread_exit(NULL).
 
In the beginning of the main program a  thread_id of 1 is assigned to the first thread via the thread_data structure that is declared at the beginning of the program. This is used to identify which process is being run by the processor. Then the thread is created using the pthread_create() function with the rc variable which is used to identified the problem if the thread fail to be created. The first thread will execute the PrintProcess1 routine when the thread is created. After the first thread is created we create the second thread with a thread_id of 2 using the same procedure, but this time the PrintProcess2 routine will be used for the second thread.

In each of the PrintProcess routine the thread_id will be passed onto a process_id variable via the threadid data structure. Then the process will print a message saying the process is running, then delay by the number of seconds that is decided by the process_id, and display a message saying the process is finished. The pthread_exit(NULL) function will be used to terminate the current thread.


Related Discussions:- Pthreads

Define secondary memory, Define secondary memory. This memory holds tho...

Define secondary memory. This memory holds those pages that are not there in main memory. The secondary memory is usually a high speed disk. It is called as the swap device, an

Race condition, list the prevention of mechanism for race condition with op...

list the prevention of mechanism for race condition with operating system

How does windows xp execute transport protocols, Q. What kinds of networkin...

Q. What kinds of networking does Windows XP support? How does Windows XP execute transport protocols? Describe two networking protocols. Answer: Support is offer for bo

Load sharing , Load Sharing : Processes are not given to a particular proc...

Load Sharing : Processes are not given to a particular processor. A global queue of threads is used to maintain. Each processor, when idle, picks a thread from this queue. Note th

Medium term scheduler, Medium term scheduling is form of the swapping ope...

Medium term scheduling is form of the swapping operation. This attaches to processes that are in a suspended or blocked state. They are swapped out of real-memory storage until t

Binary arithmetic, The principle is that of ordinary addition; however reme...

The principle is that of ordinary addition; however remember the highest number is 1.   Calculate the following:                             11001 +                           11

Explain the thread contextual data, Explain the Thread Contextual Data  ...

Explain the Thread Contextual Data  Threads in Net Ware carry additional context as well. Per-thread, stacks, errno, Net Ware Errno, t_errno and others are available to the ap

Fcfs scheduling algorithm, Q. Presume that the following processes arrive f...

Q. Presume that the following processes arrive for execution at the times indicated. Every process will run the listed amount of time. In responding the questions use non pre-empti

Define file organization, File Organization     * Sequential     * D...

File Organization     * Sequential     * Direct     * Indexed A file still if it is stored on a magnetic disk or CD-ROM disk may perhaps have a sequential file organiz

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd