#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <pthread.h>

struct what {
	char *p;
	size_t s;
	long pagesize;
};
void *
run(void *v) {
	struct what *w = v;
	char *ep;
	char *p = w->p;
	printf("mapped 0x%jx\n", (intmax_t)w->s);
	for (ep = p + w->s; p < ep; p += w->pagesize)
		*p = 1;
}

int
main(int argc, char * argv[])
{
	long pagesize = sysconf(_SC_PAGE_SIZE);
	size_t s, o;
	char *p, *ep;
	pthread_t t;
	struct what w[100];
	int e;

	for (o = 1; o != 0; o <<= 1) {
		s = o;
	}

	for (o = 0; s; s >>= 1) {
		for (; (p = mmap(NULL, s, PROT_READ|PROT_WRITE,
		    MAP_PRIVATE|MAP_ANON, -1, 0)) != MAP_FAILED; o++) {
		    if (o == 100)
			abort();
		    w[o].p = p;
		    w[o].s = s;
		    w[o].pagesize = pagesize;
		    if ((e = pthread_create(&t, NULL, run, &w[o])) != 0) {
			errno = e;
			warn("pthread_create");
		    }
		}
        }
	sleep(100000);
	return 0;
}