int main(int argc, char **argv)
{
int i, nthreads, count[MAXNTHREADS];
pthread_t tid_produce[MAXNTHREADS], tid_consume;
if (argc != 3)
err_quit("Usage: prodcons2 <#items> <#threads>");
nitems = min(atoi(argv[1]), MAXNITEMS);
nthreads = min(atoi(argv[2]), MAXNTHREADS);
Pthread_setconcurrency(nthreads);
// start all the producer threads
for (i = 0; i < nthreads; i++)
{
count[i] = 0;
Pthread_create(&tid_produce[i], NULL, produce, &count[i]);
}
//wait for all the producer threads
for (i = 0; i < nthreads; i++)
{
Pthread_join(tid_produce[i], NULL);
printf("count[%d] = %d\n", i, count[i]);
}
//start then wait for the consumer thread
Pthread_create(&tid_consume, NULL, consume, NULL);
Pthread_join(tid_consume, NULL);
exit(0);
}
int main(int argc, char **argv)
{
pthread_t tid_produce, tid_consume;
if (argc != 2)
err_quit("Usage: pc <#items>");
nitems = atoi(argv[1]);
//create three semaphore
shared.mutex = Sem_open(Px_ipc_name(SEM_MUTEX), O_CREAT | O_EXCL, FILE_MODE, 1);
shared.nempty = Sem_open(Px_ipc_name(SEM_NEMPTY), O_CREAT | O_EXCL, FILE_MODE, NBUFF);
shared.nstored = Sem_open(Px_ipc_name(SEM_NSTORED), O_CREAT | O_EXCL, FILE_MODE, 0);
//create one producer thread and one consumer thread
Pthread_setconcurrency(2);
Pthread_create(&tid_produce, NULL, produce, NULL);
Pthread_create(&tid_consume, NULL, consume, NULL);
//wait for the two threads
Pthread_join(tid_produce, NULL);
Pthread_join(tid_consume, NULL);
//remove the semaphores
Sem_unlink(Px_ipc_name(SEM_MUTEX));
Sem_unlink(Px_ipc_name(SEM_NEMPTY));
Sem_unlink(Px_ipc_name(SEM_NSTORED));
exit(0);
}
int main(int argc, char **argv)
{
pthread_t tid_produce, tid_consume;
if (argc != 2)
err_quit("Usage: buffer <pathname>");
fd = Open(argv[1], O_RDONLY);
Sem_init(&shared.mutex, 0, 1);
Sem_init(&shared.nempty, 0, NBUFF);
Sem_init(&shared.nstored, 0, 0);
Pthread_setconcurrency(2);
Pthread_create(&tid_produce, NULL, produce, NULL);
Pthread_create(&tid_consume, NULL, consume, NULL);
Pthread_join(tid_produce, NULL);
Pthread_join(tid_consume, NULL);
Sem_destroy(&shared.mutex);
Sem_destroy(&shared.nempty);
Sem_destroy(&shared.nstored);
exit(0);
}
