C-line Chengdai-generation debugging, POSIX Threads Generation Code

C-line Chengdai-generation debugging, POSIX Threads Generation Code
(CSCI 363) Project--POSIX Threads
Instructions
This program sorts strings using "enzymes". An enzyme was a function that sorts the consecutive
Characters. We define one enzyme per pair of consecutive characters; These enzymes working
Together in parallel can sort the entire string. We use Pthreads to instantiate and parallelize the
Enzymes.
Unfortunately, this program doesn ' t seem to be working correctly. That's where you are come in.
Before you edit the code, read through it, and answer these questions:
1) Briefly explain why this application would is difficult to write using multiple processes
instead of threads.
2) What is the significance of ' workperformed '? How is it used?
3) Explain exactly what's the type of ' FP ' in the following declaration:void * (*FP) (void *)
Now, to fix the program:
1) the function run_enzyme () needs to be created. Please see the notes inside enzyme.c.
2) The function ' Make_enzyme_threads ' has a memory bug. Fix this by simply re-ordering the
Lines in the This function. It's simple fix, but could take a while for your to find it.
3) The function ' Join_on_enzymes ' is incomplete. Read the relevant mans pages and figure out
How the function was supposed to work. Then insert the correct code snippets into
' Whatgoeshere '.
4) Your programming work can is considered complete if you have completed the above
And all of the tests pass.
Testing
Make Test
./enzyme-test-f0 All
Running tests ...
1.make::p
2.sort::p
3.pleasequit1::p
4.pleasequit0::p
5.SWAP1::p
6.SWAP2::p
7.SWAP3::p
8.run_enzyme::p
9.join::p
10.cancel::p
Also want to experiment with the Cancel function-
./enzyme Cba
./enzyme CBA
Questions
1) Why does we not detach any of the enzyme threads? Would the program function if we
Detached the sleeper thread?
2) Why does the program use Sched_yield? What happens if this is not used? Would the swap
Counts always being identical?
3) Threads is cancelled if the string contains a ' C ' e.g. "cherub". Why does we not include
Cancelled threads when adding up the total number of swaps?
4) What happens if a thread tries to join itself? (need to create a test
Try this) Does it deadlock? Or does it generate an error?
5) briefly explain how the sleeper thread is implemented.
6) Briefly explain why pthread_cancel_asynchronous are used in the this MP.
7) briefly explain the bug in #2 of the "Fix the program" section above.
Turn in
ENZYME.C (i.e. finish fix the program sections tasks) and yourname.docx (i.e. answer the
Questions above). Due date'll is announced on Blackboard.
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C-line Chengdai-generation debugging, POSIX Threads Generation Code