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CS 416- Fall 2008 Session 02

CS 416- Fall 2008 Session 02. TA: Tuan Phan Email: tphan@cs.rutgers.edu 732-445-6450 (ext 9644) : Just leaving msg( prefer using Email, with HEADER: [CS416] …) Recitation: TH :3:35pm – 4:30 PM @ SEC 202 Office Hour: TH 5:00 – 6:00 PM @ Hill 367

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CS 416- Fall 2008 Session 02

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  1. CS 416- Fall 2008Session 02 TA: Tuan Phan Email: tphan@cs.rutgers.edu 732-445-6450 (ext 9644) : Just leaving msg( prefer using Email, with HEADER: [CS416] …) Recitation: TH :3:35pm – 4:30 PM @ SEC 202 Office Hour: TH 5:00 – 6:00 PM @ Hill 367 Another place to find me: PANIC LAB, CORE 340 Extra: Email to setup appointment on Monday afternoon. TA’s Web Site: http://paul.rutgers.edu/~tphan/cs416/ Slides for recitation, Useful Links

  2. Today’s topics • Remind about the submission system • Project 1 • New system_call howto? • Where to insert the counting variables? • fork, vfork, execve & clone. • PThread Library

  3. ADD NEW SYSTEM CALL - SUMMARY • Modify entry.S, unistd.h • Create chad.c & chad.h -> ~linux/kernel/ • Update the Makefile • Compile the new kernel.

  4. sys_fork() • ~linux/arch/i386/kernel/process.c • asmlinkage int sys_fork(struct pt_regs regs) { return do_fork(SIGCHLD, regs.esp, &regs, 0); }

  5. Using extern • The extern keyword is used to inform the compiler about variables declared outside of the current scope. • E.g: • extern int fork_count; • extern void my_function(int a, int b);

  6. Pthread Tutorial • Links: • https://computing.llnl.gov/tutorials/pthreads/

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