/* $NetBSD: sem.c,v 1.10 2012/03/09 14:25:34 joerg Exp $ */
/*
* Common code for semaphore tests. This can be included both into
* programs using librt and libpthread.
*/
#include <sys/types.h>
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include <atf-c.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "../../h_macros.h"
ATF_TC(postwait);
ATF_TC_HEAD(postwait, tc)
{
atf_tc_set_md_var(tc, "descr", "tests post and wait from a "
"single thread (%s)", LIBNAME);
}
ATF_TC_BODY(postwait, tc)
{
sem_t sem;
int rv;
rump_init();
ATF_REQUIRE_EQ(sem_init(&sem, 1, 0), 0);
sem_post(&sem);
sem_post(&sem);
sem_wait(&sem);
sem_wait(&sem);
rv = sem_trywait(&sem);
ATF_REQUIRE(errno == EAGAIN);
ATF_REQUIRE(rv == -1);
}
ATF_TC(initvalue);
ATF_TC_HEAD(initvalue, tc)
{
atf_tc_set_md_var(tc, "descr", "tests initialization with a non-zero "
"value (%s)", LIBNAME);
}
ATF_TC_BODY(initvalue, tc)
{
sem_t sem;
rump_init();
sem_init(&sem, 1, 4);
ATF_REQUIRE_EQ(sem_trywait(&sem), 0);
ATF_REQUIRE_EQ(sem_trywait(&sem), 0);
ATF_REQUIRE_EQ(sem_trywait(&sem), 0);
ATF_REQUIRE_EQ(sem_trywait(&sem), 0);
ATF_REQUIRE_EQ(sem_trywait(&sem), -1);
}
ATF_TC(destroy);
ATF_TC_HEAD(destroy, tc)
{
atf_tc_set_md_var(tc, "descr", "tests sem_destroy works (%s)", LIBNAME);
}
ATF_TC_BODY(destroy, tc)
{
sem_t sem;
int rv, i;
rump_init();
for (i = 0; i < 2; i++) {
sem_init(&sem, 1, 1);
ATF_REQUIRE_EQ(sem_trywait(&sem), 0);
ATF_REQUIRE_EQ(sem_trywait(&sem), -1);
ATF_REQUIRE_EQ(sem_destroy(&sem), 0);
rv = sem_trywait(&sem);
ATF_REQUIRE_EQ(errno, EINVAL);
ATF_REQUIRE_EQ(rv, -1);
}
}
ATF_TC(busydestroy);
ATF_TC_HEAD(busydestroy, tc)
{
atf_tc_set_md_var(tc, "descr", "tests sem_destroy report EBUSY for "
"a busy semaphore (%s)", LIBNAME);
}
static void *
hthread(void *arg)
{
sem_t *semmarit = arg;
for (;;) {
sem_post(&semmarit[2]);
sem_wait(&semmarit[1]);
sem_wait(&semmarit[0]);
}
return NULL;
}
ATF_TC_BODY(busydestroy, tc)
{
sem_t semmarit[3];
pthread_t pt;
int i;
/* use a unicpu rump kernel. this means less chance for race */
setenv("RUMP_NCPU", "1", 1);
rump_init();
sem_init(&semmarit[0], 1, 0);
sem_init(&semmarit[1], 1, 0);
sem_init(&semmarit[2], 1, 0);
pthread_create(&pt, NULL, hthread, semmarit);
/*
* Make a best-effort to catch the other thread with its pants down.
* We can't do this for sure, can we? Although, we could reach
* inside the rump kernel and inquire about the thread's sleep
* status.
*/
for (i = 0; i < 1000; i++) {
sem_wait(&semmarit[2]);
usleep(1);
if (sem_destroy(&semmarit[1]) == -1)
if (errno == EBUSY)
break;
/*
* Didn't catch it? ok, recreate and post to make the
* other thread run
*/
sem_init(&semmarit[1], 1, 0);
sem_post(&semmarit[0]);
sem_post(&semmarit[1]);
}
if (i == 1000)
atf_tc_fail("sem destroy not reporting EBUSY");
pthread_cancel(pt);
pthread_join(pt, NULL);
}
ATF_TC(blockwait);
ATF_TC_HEAD(blockwait, tc)
{
atf_tc_set_md_var(tc, "descr", "tests sem_wait can handle blocking "
"(%s)", LIBNAME);
atf_tc_set_md_var(tc, "timeout", "2");
}
ATF_TC_BODY(blockwait, tc)
{
sem_t semmarit[3];
pthread_t pt;
int i;
rump_init();
sem_init(&semmarit[0], 1, 0);
sem_init(&semmarit[1], 1, 0);
sem_init(&semmarit[2], 1, 0);
pthread_create(&pt, NULL, hthread, semmarit);
/*
* Make a best-effort. Unless we're extremely unlucky, we should
* at least one blocking wait.
*/
for (i = 0; i < 10; i++) {
sem_wait(&semmarit[2]);
usleep(1);
sem_post(&semmarit[0]);
sem_post(&semmarit[1]);
}
pthread_cancel(pt);
pthread_join(pt, NULL);
}
ATF_TC(blocktimedwait);
ATF_TC_HEAD(blocktimedwait, tc)
{
atf_tc_set_md_var(tc, "descr", "tests sem_timedwait can handle blocking"
" (%s)", LIBNAME);
atf_tc_set_md_var(tc, "timeout", "2");
}
ATF_TC_BODY(blocktimedwait, tc)
{
sem_t semid;
struct timespec tp;
rump_init();
clock_gettime(CLOCK_REALTIME, &tp);
tp.tv_nsec += 50000000;
tp.tv_sec += tp.tv_nsec / 1000000000;
tp.tv_nsec %= 1000000000;
ATF_REQUIRE_EQ(sem_init(&semid, 1, 0), 0);
ATF_REQUIRE_ERRNO(ETIMEDOUT, sem_timedwait(&semid, &tp) == -1);
}
ATF_TC(named);
ATF_TC_HEAD(named, tc)
{
atf_tc_set_md_var(tc, "descr", "tests named semaphores (%s)", LIBNAME);
}
/*
* Wow, easy naming rules. it's these times i'm really happy i can
* single-step into the kernel.
*/
#define SEM1 "/precious_sem"
#define SEM2 "/justsem"
ATF_TC_BODY(named, tc)
{
sem_t *sem1, *sem2;
void *rv;
rump_init();
sem1 = sem_open(SEM1, 0);
ATF_REQUIRE_EQ(errno, ENOENT);
ATF_REQUIRE_EQ(sem1, NULL);
sem1 = sem_open(SEM1, O_CREAT, 0444, 1);
if (sem1 == NULL)
atf_tc_fail_errno("sem_open O_CREAT");
rv = sem_open(SEM1, O_CREAT | O_EXCL);
ATF_REQUIRE_EQ(errno, EEXIST);
ATF_REQUIRE_EQ(rv, NULL);
sem2 = sem_open(SEM2, O_CREAT, 0444, 0);
if (sem2 == NULL)
atf_tc_fail_errno("sem_open O_CREAT");
/* check that semaphores are independent */
ATF_REQUIRE_EQ(sem_trywait(sem2), -1);
ATF_REQUIRE_EQ(sem_trywait(sem1), 0);
ATF_REQUIRE_EQ(sem_trywait(sem1), -1);
/* check that unlinked remains valid */
sem_unlink(SEM2);
ATF_REQUIRE_EQ(sem_post(sem2), 0);
ATF_REQUIRE_EQ(sem_trywait(sem2), 0);
ATF_REQUIRE_EQ(sem_trywait(sem2), -1);
ATF_REQUIRE_EQ(errno, EAGAIN);
#if 0 /* see unlink */
/* close it and check that it's gone */
if (sem_close(sem2) != 0)
atf_tc_fail_errno("sem close");
ATF_REQUIRE_EQ(sem_trywait(sem2), -1);
ATF_REQUIRE_EQ(errno, EINVAL);
#endif
/* check that we still have sem1 */
sem_post(sem1);
ATF_REQUIRE_EQ(sem_trywait(sem1), 0);
ATF_REQUIRE_EQ(sem_trywait(sem1), -1);
ATF_REQUIRE_EQ(errno, EAGAIN);
}
ATF_TC(unlink);
ATF_TC_HEAD(unlink, tc)
{
/* this is currently broken. i'll append the PR number soon */
atf_tc_set_md_var(tc, "descr", "tests unlinked semaphores can be "
"closed (%s)", LIBNAME);
}
#define SEM "/thesem"
ATF_TC_BODY(unlink, tc)
{
sem_t *sem;
rump_init();
sem = sem_open(SEM, O_CREAT, 0444, 0);
ATF_REQUIRE(sem);
if (sem_unlink(SEM) == -1)
atf_tc_fail_errno("unlink");
if (sem_close(sem) == -1)
atf_tc_fail_errno("close unlinked semaphore");
}
/* use rump calls for libpthread _ksem_foo() calls */
#define F1(name, a) int _ksem_##name(a); \
int _ksem_##name(a v1) {return rump_sys__ksem_##name(v1);}
#define F2(name, a, b) int _ksem_##name(a, b); \
int _ksem_##name(a v1, b v2) {return rump_sys__ksem_##name(v1, v2);}
F2(init, unsigned int, intptr_t *);
F1(close, intptr_t);
F1(destroy, intptr_t);
F1(post, intptr_t);
F1(unlink, const char *);
F1(trywait, intptr_t);
F1(wait, intptr_t);
F2(getvalue, intptr_t, unsigned int *);
F2(timedwait, intptr_t, const struct timespec *);
int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *);
int _ksem_open(const char *a, int b, mode_t c, unsigned int d, intptr_t *e)
{return rump_sys__ksem_open(a,b,c,d,e);}
