w6-tutorial - CSC369H Operating Systems Tutorial 5 February...

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CSC369H: Operating Systems Tutorial 5 -- February 8th, 2010 George Amvrosiadis [email protected]
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Agenda The PID system Assignment 2 Inner workings: fork() HowTo: fork() Inner workings: execv() George Amvrosiadis [email protected]
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Assignment 2: Threading & Processes Design Document (Just like A1) Code Reading (14 Questions) Extend thread system Implement new syscalls
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Assignment 2: Threading & Processes Design Document (Just like A1) Code Reading (14 Questions) Extend thread system Implement new syscalls Check the webpage for specific issues!
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Each thread has a PID info block (process ID, parent ID, status, ...) PID blocks stored in the PID table - shared! You must add functions + synchronization Your arsenal includes locks, semaphores, CVs... (check synch.h ) The PID system
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int thread_join (pid_t pid, int *status) blocks until pid thread returns with status Condition: thread = joinable + child of the caller ??? thread_exit (???) Accept exit status & Synchronize w/ thread Assignment 2: The thread system Files to mess with: (in kern/thread) pid.c pid.h thread.c thread.h
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int thread_detach (pid_t pid) Puts pid in detached state (= discard after exit) Condition: thread = !joinable ??? thread_fork (???) Returns pid (by reference!) rather than pointer to thread struct.
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