c, c++ producer consumer with shared buffer problem...plz help

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Hi,

I am in a BIG problem because i need to do an assignment upon which my whole faculty education depends. if i dont do it i'm off from the faculty so i beg you or someone to help me do it.

The assignment goes like this:

Simulate a system with m producers and n consumers who communicate through the buffer (it is shared buffer) of k character length. producers first load the string from the keyboard, and only after all the m producers loaded their keyboard strings, can they begin to send characters (one char not whole string) in to the buffer, and then consumers take char's one by one from the buffer. Each producer after sending one character waits a random number of seconds / milliseconds before attempting to send the next character. (Range mode as determined independently from 0 to 1500ms) The numbers m,n and k are entered as command line parameters. Each producer and consumer is simulated with a process. None of the producers can start until all producers load their string from the keyboard. Synchronization of that part is done with semaphores. Synchronization of the character exchange of producers and consumers also also needs to be done with semaphores. i need to display in the appropriate way the sending and receiving characters. Achieve program for UNIX (Linux) and Windows operating systems.

tnx in advance