The purpose of this project is to familiarize yourself with the design and implementation issues of...

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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 files 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 first 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 finds 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 event mechanism. The events are declared as variables with a data type xthread_event_t. The following three functions have to be implemented: void xthread_init_ev (xthread_event_t *e); The event pointed by e is initialized as NOT_OCCURRED when xthread_init_ev () is invoked. void xthread_wait_ev (xthread_event_t *e) ; The function xthread_wait_ev () will place the calling thread on a queue of threads if the event pointed by e has not occurred. Otherwise, the calling thread continues to execute and the event is set to be NOT_OCCURRED. void xthread_set_ev (xthread_event_t *e) ; When a thread does a xthread_set_ev() operation on the event pointed by e, ALL of the waiting threads are allowed to continue processing and the event will be reset to NOT OCCURRED. If there are no queued processes, the event will be set as OCCURRED. Note that if the SIGALRM occurs during the execution of thread creation/completion, event wait/set, etc., the process table may lead to an inconsistent state (why? Give an example in your report). To solve this problem, you can use usec ualarm (0,0); ualarm (usec, 0); to disable the timer interrupt at the function entrance and restore it before the function returns. 1 Turnin Each group (two students) has to submit your report and program electronically. You have to put your report file (i.e. report.pdf) under the xt dir. Before you submit, you need to use make clean to clean all of the object/executable files. Then, on grail, change the directory to the parent directory of the xt dir and use the following command to submit the whole xt dir: turnin -c cis620s -p proj2 xt Your report should include the description of your code, the thread state transition diagram, experiences in debugging and testing, the project status (working or not), etc. The cover page should contain your pictures, names and the login id you used to turnin the project. Start on time and good luck. If you have any questions, send e-mail to j. sang@csuohio.edu. 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 files 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 first 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 finds 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 event mechanism. The events are declared as variables with a data type xthread_event_t. The following three functions have to be implemented: void xthread_init_ev (xthread_event_t *e); The event pointed by e is initialized as NOT_OCCURRED when xthread_init_ev () is invoked. void xthread_wait_ev (xthread_event_t *e) ; The function xthread_wait_ev () will place the calling thread on a queue of threads if the event pointed by e has not occurred. Otherwise, the calling thread continues to execute and the event is set to be NOT_OCCURRED. void xthread_set_ev (xthread_event_t *e) ; When a thread does a xthread_set_ev() operation on the event pointed by e, ALL of the waiting threads are allowed to continue processing and the event will be reset to NOT OCCURRED. If there are no queued processes, the event will be set as OCCURRED. Note that if the SIGALRM occurs during the execution of thread creation/completion, event wait/set, etc., the process table may lead to an inconsistent state (why? Give an example in your report). To solve this problem, you can use usec ualarm (0,0); ualarm (usec, 0); to disable the timer interrupt at the function entrance and restore it before the function returns. 1 Turnin Each group (two students) has to submit your report and program electronically. You have to put your report file (i.e. report.pdf) under the xt dir. Before you submit, you need to use make clean to clean all of the object/executable files. Then, on grail, change the directory to the parent directory of the xt dir and use the following command to submit the whole xt dir: turnin -c cis620s -p proj2 xt Your report should include the description of your code, the thread state transition diagram, experiences in debugging and testing, the project status (working or not), etc. The cover page should contain your pictures, names and the login id you used to turnin the project. Start on time and good luck. If you have any questions, send e-mail to j. sang@csuohio.edu.

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Answer Heres a highlevel overview of the tasks you need to perform for Part I and Part II Part I Pre... View the full answer