A new template for Lab 5 (Consumer Producer Assignment) based on the old one.
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/***** Global Includes *****/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
/***** Local Includes *****/
#include "queue.h"
#include "thread.h"
/***** Constants *****/
#define TIME_TO_PRODUCE 1000 // milliseconds
#define TIME_TO_CONSUME 1000 // milliseconds
#define LOOP 10
/***** Producer *****
* The function called by the producer thread.
* TODO for students: This function does not lock the queue and will
* ultimately race with the consumers. Experiment with locking and unlocking
* the producer using the queueLock() and queueUnlock() functions.
void producer(queue *q)
for (int i = 0; i < LOOP; ++i)
// Pretend that expensive operations are occuring by sleeping.
// Busy loop while the queue is full. (HINT THIS IS AN UNSYNCHRONIZED READ)
while (queueIsFull(q));
// Put the produced item onto the queue and print that the enqueue occured.
enqueue(q, i+1);
printf("producer: produced %d th.\n",i+1);
/***** Consumer *****
* The function called by the consumer threads.
* TODO for students: The consumers does not lock the queue when consuming
* and ultimately race with the producer and other consumers. Experiment
* with the queueLock() and queueUnlock() functions within this function.
void consumer(queue *q)
// Simulate the consumer's random quick arrival (Makes race conditions prominent)
sleep_milliseconds((rand()%LOOP) * TIME_TO_CONSUME/LOOP);
// Wait for an item to be in the queue. (HINT THIS IS AN UNSYNCHRONIZED READ)
while (queueIsEmpty(q));
// Pretend to consume
printf("------------------------------------>consumer: recieved %d.\n", dequeue(q));
int main()
// Initialize the queue. If the queue fails to initialize, kill the program.
queue *q = queueInit();
if (q == NULL)
fprintf(stderr, "main: Queue Init failed.\n");
// Seed the random number generator using the system clock.
unsigned int iseed = (unsigned int) time(NULL);
// Start one producer thread and as many consumer threads as specified above.
thread_t pro, con[LOOP];
create_thread(&pro, producer, q);
for (int i = 0; i < LOOP; ++i)
sleep_milliseconds((rand() % 2) * 1000);
create_thread(&con[i], consumer, q);
// Let the producers and consumers finish before cleaning up.
wait_for_threads(&pro, 1);
wait_for_threads(con, LOOP);
// Clean up the queue.
#ifdef WINDOWS
// If this is running in Windows, execute the "pause" shell command so that
// the command prompt window doesn't close after this program finishes.
return 0;