lab4

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define NUM_THREADS    10

void *PrintHello(void *threadid) {
    long tid;
    tid = (long) threadid;
    while (1) {
        printf("Thread #%ld!\n", tid);
        sleep(2);
    }
}

int main(int argc, char *argv[]) {
    pthread_t threads[NUM_THREADS];
    int rc, currentThreadCount;
    long t;
    char c;
    currentThreadCount = 0;
    while (c != 'q') {
        switch (c = getchar()) {
            case '=': {
                if (currentThreadCount < NUM_THREADS) {
                    currentThreadCount++;
                    printf("Creating thread %ld\n", currentThreadCount);
                    rc = pthread_create(&threads[currentThreadCount], NULL, PrintHello, (void *) currentThreadCount);
                    if (rc) {
                        printf("ERROR; return code from pthread_create() is %d\n", rc);
                        exit(-1);
                    }
                } else {
                    printf("Maximum number of thread reached\n");
                }
                break;
            }
            case '-': {
                printf("Killing thread %ld\n", currentThreadCount);
                pthread_cancel(threads[currentThreadCount]);
                currentThreadCount--;
                break;
            }
            case 'q': {
                exit(0);
            }
        }
    }
    return 0;
}