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12.2_producer.c
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12.2_producer.c
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/*
* Program: producer.c
* Purpose: Demonstrates the Producer-Consumer problem
* with bounded buffer (circular queue) in shared memory
* using process semaphore for synchronization.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "buffer.h"
#include "psem.h"
#define DELAY 1000000 // Micro-seconds
#define MAXITERATION 30
int
main (void)
{
int shmid, smem_size, i;
unsigned x = 0;
buffer *sbuf = NULL;
psem_t mutex;
psem_t empty, full;
smem_size = sizeof (buffer);
shmid = shmget (1234, smem_size, 0666 | IPC_CREAT); // Allocating space for shared memory
if (shmid == -1)
{
perror ("shmget");
return 1;
}
sbuf = (buffer *) shmat (shmid, NULL, 0); // Attaching the shared memory space to the local space, to be used as buffer
buf_init (sbuf); // Initialising the Buffer space before use
if (!psem_init (&mutex, 4321, 1))
return 2;
if (!psem_init (&empty, 4322, BUFFSIZE))
return 2;
if (!psem_init (&full, 4323, 0))
return 2;
i = MAXITERATION; // Maximum number of iterations the production will continue
while (i--)
{
x++;
psem_wait(&empty);
psem_wait (&mutex);
if (buf_insert (sbuf, x))
printf ("Produced => %d\n", x);
else
{
x--;
puts ("Buffer FULL\n");
}
buf_display (sbuf);
psem_post (&mutex);
psem_post(&full);
usleep (DELAY);
}
/* Waiting for the Consumer to finish before termination*/
psem_holdon(&full);
return 0;
}