gistfile1.h

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

static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;

void *f(void *p) {
    long l;

    pthread_mutex_lock(&m);
    l = random();
    pthread_mutex_unlock(&m);

    printf("Entering sleep for: %ld\n", l);
    sleep(l);    
}

int main(int argc, char **argv) {
    int n = atoi(argv[1]); 
    pthread_t* t = (pthread_t *) malloc(sizeof(pthread_t) * n);
    int i = 0;
    int rc;

    assert(t);
    
    for (i = 0; i < n; i++) {
        rc = pthread_create((&t[i]), NULL, f, NULL);
        if (rc == 0) {
            pthread_detach(t[i]);
            if (i % 100 == 0)
                printf("%d threads so far\n", i+1);
            continue;
        }
        printf("failed to create thread %d with error code %d\n", i, rc);
        break;
    }

    free(t);

    return 0;
}