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/* $OpenBSD: stack.c,v 1.3 2012/08/04 21:55:22 guenther Exp $ */
/* PUBLIC DOMAIN Feb 2012 <guenther@openbsd.org> */
/* Test the handling of the pthread_attr_t stack attributes */
#include <sys/types.h>
#include <sys/mman.h>
#include <inttypes.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "test.h"
#define LARGE_SIZE (1024 * 1024)
/* thread main for plain location tests */
void *
tmain0(void *arg)
{
int s;
return (&s);
}
/* thread main for testing a large buffer on the stack */
void *
tmain1(void *arg)
{
char buf[LARGE_SIZE];
memset(buf, 0xd0, sizeof(buf));
return (buf + LARGE_SIZE/2);
}
/*
* struct and thread main for testing that a thread's stack is where
* we put it
*/
struct st
{
char *addr;
size_t size;
};
void *
tmain2(void *arg)
{
struct st *s = arg;
ASSERT((char *)&s >= s->addr && (char *)&s - s->addr < s->size);
return (NULL);
}
int
main(void)
{
pthread_attr_t attr;
pthread_t t;
struct st thread_stack;
void *addr, *addr2;
size_t size, size2, pagesize;
int err;
pagesize = (size_t)sysconf(_SC_PAGESIZE);
CHECKr(pthread_attr_init(&attr));
/* verify that the initial values are what we expect */
size = 1;
CHECKr(pthread_attr_getguardsize(&attr, &size));
ASSERT(size != 1); /* must have changed */
ASSERT(size != 0); /* we default to having a guardpage */
size = 1;
CHECKr(pthread_attr_getstacksize(&attr, &size));
ASSERT(size >= PTHREAD_STACK_MIN);
addr = &addr;
CHECKr(pthread_attr_getstackaddr(&attr, &addr));
ASSERT(addr == NULL); /* default must be NULL */
addr2 = &addr;
size2 = 1;
CHECKr(pthread_attr_getstack(&attr, &addr2, &size2));
ASSERT(addr2 == addr); /* must match the other calls */
ASSERT(size2 == size);
/* verify that too small a size is rejected */
err = pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN - 1);
ASSERT(err == EINVAL);
CHECKr(pthread_attr_getstacksize(&attr, &size2));
ASSERT(size2 == size);
/* create a thread with the default stack attr so we can test reuse */
CHECKr(pthread_create(&t, NULL, &tmain0, NULL));
sleep(1);
CHECKr(pthread_join(t, &addr));
/*
* verify that the stack has *not* been freed: we expect it to be
* cached for reuse. This is unportable for the same reasons as
* the mquery() test below. :-/
*/
*(int *)addr = 100;
/* do the above again and make sure the stack got reused */
CHECKr(pthread_create(&t, NULL, &tmain0, NULL));
sleep(1);
CHECKr(pthread_join(t, &addr2));
ASSERT(addr == addr2);
/*
* increase the stacksize, then verify that the change sticks,
* and that a large buffer fits on the resulting thread's stack
*/
size2 += LARGE_SIZE;
CHECKr(pthread_attr_setstacksize(&attr, size2));
CHECKr(pthread_attr_getstacksize(&attr, &size));
ASSERT(size == size2);
CHECKr(pthread_create(&t, &attr, &tmain1, NULL));
sleep(1);
CHECKr(pthread_join(t, &addr));
/* test whether the stack has been freed */
/* XXX yow, this is grossly unportable, as it depends on the stack
* not being cached, the thread being marked freeable before
* pthread_join() calls the gc routine (thus the sleep), and this
* being testable by mquery */
addr = (void *)((uintptr_t)addr & ~(pagesize - 1));
ASSERT(mquery(addr, pagesize, PROT_READ, MAP_FIXED|MAP_ANON, -1, 0)
== addr);
/* the attr wasn't modified by pthread_create, right? */
size = 1;
CHECKr(pthread_attr_getstacksize(&attr, &size));
ASSERT(size == size2);
/* allocate our own stack and verify the thread uses it */
size = pagesize * 4;
addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE,
-1, 0);
ASSERT(addr != MAP_FAILED);
memset(addr, 0xd0, size);
CHECKr(pthread_attr_setstack(&attr, addr, size));
CHECKr(pthread_attr_getstacksize(&attr, &size2));
ASSERT(size2 == size);
CHECKr(pthread_attr_getstackaddr(&attr, &addr2));
ASSERT(addr2 == addr);
CHECKr(pthread_attr_getstack(&attr, &addr2, &size2));
ASSERT(addr2 == addr);
ASSERT(size2 == size);
thread_stack.addr = addr;
thread_stack.size = size;
CHECKr(pthread_create(&t, &attr, &tmain2, &thread_stack));
sleep(1);
CHECKr(pthread_join(t, NULL));
/* verify that the stack we allocated was *not* freed */
memset(addr, 0xd0, size);
return (0);
}
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