you will write a program that will package books published by different publishers.

You will have publisher and packager threads. After publishers publish books, packagers package the

books published.

 The number of publisher types, publisher and packager threads will be given as command line

argument. (i.e. You will have n number of publisher types. Each publisher type will have m

publisher threads (at total, there will be m*n publisher threads). There will be k number of

packager threads. All these numbers (n, m, and k) will be given as command line arguments.)

 Each publisher type threads will publish one type of book. The number of books that will be

published by each publisher type will be given as command line argument.

 The books will be named according to its publisher type, i.e., the lth book published by the ith type

of publisher will be named Booki_l.

 After publishing a new book, each publisher thread will put it in a buffer that is shared among the

same type of publisher. (Each publisher type will have its own buffer.) The buffers’ initial size

will be given as command line argument.

 When its buffer is full, the publisher thread that wants to put a book will double the size of the


 When each publisher thread publishes required number of books, they will exit the system.

 Packagers package the books published. They will take books from the buffers (each packager

thread can take books from all buffers).

 Each packager thread will put some number of books in a package. This number will be given as

command line argument.

 After one package is prepared, packager thread will prepare another package.

 Packagers will select the book type to put into package randomly. Then, it will take the book from

the related buffer and put it into its own package.

 If a buffer of the publisher type randomly chosen by the packager thread is empty, the packager

thread will check whether there are threads left in the system that belongs to chosen type. If so, it

will wait for the publisher thread to publish a book and put it into the buffer. Otherwise, it will

select another buffer.


 If a packager thread finds all buffers empty after all publisher threads exit the system, it will print

the message: “Only i of j number of books could be packaged.” and leave the system. So, you

need to keep track of how many publisher threads are left for each type.

Program Details

 The user will execute the program specifying the number of threads to be created of each kind.

You will then create the specified number of threads of each type.

 The same type of publisher threads will share the same buffer. Make sure that no multiple

publisher thread will attempt to put their books on the same place of the buffer.

 Note that packager threads can access to all buffers. Make sure that no multiple package thread

will attempt to get the same book from the buffer.

 Make sure that publisher and packager threads work concurrently. This means that when a

publisher thread puts and item to the buffer, no packager can take an item from the buffer.

 The main thread is responsible for creating all of the threads and waiting for them. Note that, all of

the threads has to exist in the system at the same time, and you have to work on synchronizing


 All the threads have to print information about their job on the screen (see the example execution


 Note that there are global buffers requested and the buffers can be accessed by many threads of

different types so a synchronization and mutual exclusion are necessary for the buffer. This can be

achieved by using the semophores and mutexes.

 The global buffers have to be created at the very first time a thread needs to use it by that thread.

 Preserving consistency and preventing deadlocks are major issues to be considered.

 Your program will be executed as follows:

o Example:

./[login to view URL] -n 2 3 4 -b 5 -s 6 7

o The -n option represents the type and number of threads. Here

Compétences : Programmation C

Concernant le client :
( 0 commentaires ) dbrsnu6, United States

Nº du projet : #28993498

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