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main.c
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main.c
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#include "main.h"
void fork_failure() {
perror("fork() failure");
exit(EXIT_FAILURE);
}
void customer_enter(char* customer_type, char *amount) {
execl(customer_type, customer_type, amount, NULL);
exit(EXIT_SUCCESS);
}
void example1() {
int thread_count, i;
pid_t pid;
thread_count = 0;
if ((pid = fork()) == 0) {
customer_enter("depositor", "200");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "800");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "200");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "1000");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "100");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "200");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "500");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "600");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "500");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
for (i = 0; i < thread_count; i++) {
wait(0);
}
}
void example2() {
int thread_count, i;
pid_t pid;
thread_count = 0;
if ((pid = fork()) == 0) {
customer_enter("depositor", "200");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "500");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "700");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "400");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "600");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "100");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "900");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "2500");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "1000");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
for (i = 0; i < thread_count; i++) {
wait(0);
}
}
void example3() {
int thread_count, i;
pid_t pid;
thread_count = 0;
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "200");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "800");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "600");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "400");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "1000");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "100");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "900");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "700");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("withdrawer", "300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
sleep(1);
if ((pid = fork()) == 0) {
customer_enter("depositor", "5300");
exit(EXIT_SUCCESS);
}
else if (pid < 0) {
fork_failure();
}
thread_count++;
for (i = 0; i < thread_count; i++) {
wait(0);
}
}
int main () {
int semid, shmid;
unsigned short seminit[NUM_SEMS];
struct common *shared;
union semun semctlarg;
struct customer *first_in_line;
semid = semget(SEMKEY, NUM_SEMS, 0777 | IPC_CREAT);
if (semid < 0) {
perror("Could not get semaphores");
exit(EXIT_FAILURE);
}
seminit[SEM_MUTEX]=1;
seminit[SEM_WAITLIST]=0;
semctlarg.array = seminit;
semctl(semid, NUM_SEMS, SETALL, semctlarg);
shmid = shmget(SHMKEY, sizeof(struct common), 0777 | IPC_CREAT);
if (shmid < 0) {
perror("Could not get shared memory");
exit(EXIT_FAILURE);
}
shared=(struct common *)shmat(shmid, 0, 0);
shared->wait_count = 0;
shared->balance = 500;
shmid = shmget(LINESTART, sizeof(struct customer), 0777 | IPC_CREAT);
if (shmid < 0) {
perror("Could not get shared memory");
exit(EXIT_FAILURE);
}
first_in_line = (struct customer *)shmat(shmid, 0, 0);
shared->customer_offset = LINESTART;
shared->front_of_line = LINESTART;
example1();
example2();
example3();
semctl(semid, NUM_SEMS, IPC_RMID, 0);
shmctl(shmid, IPC_RMID, 0);
return EXIT_SUCCESS;
}