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Top Forums UNIX for Dummies Questions & Answers Abnormal producer consumer problem driving me nuts Post 302751985 by alexantosh on Saturday 5th of January 2013 07:51:53 AM
Old 01-05-2013
Abnormal producer consumer problem driving me nuts

normally, i hate asking someone to do my homework for me but am getting desperate right now.
i have a project about consumer producer problem. the deadline is tonight at 23:55. but i havent gotten it working yet. i just COULDNT get it to work right yet.
the problem is as follows: the C - program will prompt for the following integer inputs:

Code:
m: the number of producer threads
n: the number of consumer threads
k: the size of the bounded buffer array
i: the number of candy items to be filled in each box

j: the number of candy items produced by each producer thread before it quits
now each producer thread produces a specific candy item, and each consumer thread takes an item out of the buffer one at a time. say producer1 produces red, prducer2 blue and so on.. as for consumer threads. after a given consumer thread has filled a given box; it prints the contents of the box as follows:
Consumer thread A filled a new box of candy containing: blue 3, red 7, green 8, ...

if you dont have the time to waste on beginngers' coding: atleast please hint out on how i should plan my work, because may be my problem is in the code structure. thanks
my head is now throbbing i can nolonger even think straight. anyhelp will be deeply appreciated. thanks in advance.

Moderator's Comments:
Mod Comment Homework in wrong forum. Closed.

Last edited by jim mcnamara; 01-05-2013 at 09:02 AM..
 

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BUF_RING(9)						   BSD Kernel Developer's Manual					       BUF_RING(9)

NAME
buf_ring, buf_ring_alloc, buf_ring_free, buf_ring_enqueue, buf_ring_dequeue_mc, buf_ring_dequeue_sc, buf_ring_count, buf_ring_empty, buf_ring_full, buf_ring_peek, -- multi-producer, {single, multi}-consumer lock-less ring buffer SYNOPSIS
#include <sys/param.h> #include <sys/buf_ring.h> struct buf_ring * buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *sc_lock); void buf_ring_free(struct buf_ring *br, struct malloc_type *type); int buf_ring_enqueue(struct buf_ring *br, void *buf); void * buf_ring_dequeue_mc(struct buf_ring *br); void * buf_ring_dequeue_sc(struct buf_ring *br); int buf_ring_count(struct buf_ring *br); int buf_ring_empty(struct buf_ring *br); int buf_ring_full(struct buf_ring *br); void * buf_ring_peek(struct buf_ring *br); DESCRIPTION
The buf_ring functions provide a lock-less multi-producer and lock-less multi-consumer as well as single-consumer ring buffer. The buf_ring_alloc() function is used to allocate a buf_ring ring buffer with count slots using malloc_type type and memory flags flags. The single consumer interface is protected by sc_lock. The buf_ring_free() function is used to free a buf_ring. The user is responsible for freeing any enqueued items. The buf_ring_enqueue() function is used to enqueue a buffer to a buf_ring. The buf_ring_dequeue_mc() function is a multi-consumer safe way of dequeueing elements from a buf_ring. The buf_ring_dequeue_sc() function is a single-consumer interface to dequeue elements - requiring the user to serialize accesses with a lock. The buf_ring_count() function returns the number of elements in a buf_ring. The buf_ring_empty() function returns TRUE if the buf_ring is empty, FALSE otherwise. The buf_ring_full() function returns TRUE if no more items can be enqueued, FALSE otherwise. The buf_ring_peek() function returns a pointer to the last element in the buf_ring if the buf_ring is not empty, NULL otherwise. RETURN VALUES
The buf_ring_enqueue() function return ENOBUFS if there are no available slots in the buf_ring. HISTORY
These functions were introduced in FreeBSD 8.0. BSD
September 27, 2012 BSD
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