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CIS620 Advanced Topics in Machine Learning
Task:
The purpose of this project is to familiarize yourself with the design and implementation issues of a user level thread package on PC/Linux. You need to use the tar command with the options xvfz to uncompress and extract fifiles from ~ cis620s/pub/xt.tar.gz to your working directory.
Part I
The thread package which we discussed in the class is non-preemptive. That is, a thread can run to comple tion unless it yields the control to other threads. For the fifirst part of this assignment, you need to make the threads preemptive. You can use signal and ualarm to provide a clock interrupt every 0.01 second. When the clock interrupt occurs, the interrupt handler suspends the current running thread and fifinds a runnable thread to run. On PC/Linux, you need sigemptyset, sigaddset, and sigprocmask to unblock the SIGALRM signal to allow the next SIGALRM delivered. Add more comments to the source code.
Part II
You also need to enhance the thread library with the message passing mechanism. The mailboxes are declared as variables with a data type xthread mbox t. Each message box can hold only one positive integer value. It also has a queue of threads waiting for a message. You have to implement the following four thread functions:
- int xthread init mbox(xthread mbox t *mptr);
The mailbox pointed by mptr is initialized when xthread init mbox() is invoked. That is, no message is in the mailbox and the waiting queue in the mailbox is empty.
- int xthread send(xthread mbox t *mptr, int msg);
The function xthread send deposits a message msg to the mailbox pointed by mptr. If there is a thread waiting for a message, xthread send changes the thread to the ready state and delivers the message to it. On success, xthread send returns 0. On error, it returns -1 if the mailbox is full.
- int xthread broadcast(xthread mbox t *mptr, int msg);
The function xthread broadcast operates much like the function xthread send except that all of the threads waiting in the queue will be unblocked and get the message msg.
- void xthread recv(xthread mbox t *mptr, int *msgptr);
The function xthread recv checks whether there is a message in the mailbox pointed by mptr. If yes, the message can be delivered to the location pointed by msgptr. Otherwise, the calling thread has to wait until a message arrives.
CIS620 Advanced Topics in Machine Learning
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