Write a C program that implements a producer-consumer system with two processes.(Using Semaphores).
AIM:
Write a C program that implements a producer-consumer system with two processes.(Using Semaphores).
Program:
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <sys/types.h> #include <sys/ipc.h> #include <sys/sem.h> #define NUM_LOOPS 20 int main(int argc, char* argv[]) { int sem_set_id; union semun sem_val; int child_pid; int i; struct sembuf sem_op; int rc; struct timespec delay; sem_set_id = semget(IPC_PRIVATE, 1, 0600); if (sem_set_id == -1) { perror("main: semget"); exit(1); } printf("semaphore set created, semaphore set id '%d'.\n", sem_set_id); sem_val.val = 0; rc = semctl(sem_set_id, 0, SETVAL, sem_val); child_pid = fork(); switch (child_pid) { case 1: perror("fork"); exit(1); case 0: for (i=0; i<NUM_LOOPS; i ) { sem_op.sem_num = 0; sem_op.sem_op = -1; sem_op.sem_flg = 0; semop(sem_set_id, &sem_op, 1); printf("consumer: '%d'\n", i); fflush(stdout); sleep(3); } break; default: for (i=0; i<NUM_LOOPS; i ) { printf("producer: '%d'\n", i); fflush(stdout); sem_op.sem_num = 0; sem_op.sem_op = 1; sem_op.sem_flg = 0; semop(sem_set_id, &sem_op, 1); sleep(2); if (rand() > 3*(RAND_MAX/4)) { delay.tv_sec = 0; delay.tv_nsec = 10; nanosleep(&delay, NULL); } } break; } return 0; }
Output:
Student@ubuntu:~$ gcc sem.c Student@ubuntu:~$ ./a.out Semaphore set created Consumer 0 Consumer 1 Producer 0 Producer 1
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UpdatedOct 23, 2014
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