test how many nateve threads the platform can create

pthread_infinit.c

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

void *
thread_func(void *p)
{
    for(;;);
    return NULL;
}

int
main()
{
    pthread_attr_t attr;
    pthread_t id;
    int loop = 1;
    int cnt = 0;
    
    while (loop) {
        pthread_attr_init(&attr);
        pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
        if (pthread_create(&id, &attr, thread_func, NULL) == 0) {
            cnt++;
        } else {
            loop = 0;
        }
        pthread_attr_destroy(&attr);
    }

    printf("%d threads created\n", cnt);

    return 0;
}