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error_unit.c
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error_unit.c
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/*
* vim: ts=8:sw=8:tw=79:noet
*
* Copyright (c) 2011-2012, the Locksmith authors.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "lksmith.h"
#include "test.h"
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#define THREAD_WRAPPER_VOID(fn) \
static void *fn##_wrap(void *v __attribute__((unused))) { \
return (void*)(intptr_t)fn(); \
}
#define THREAD_WRAPPER_INT(fn) \
static void *fn##_wrap(void *v) { \
return (void*)(intptr_t)fn((int)(intptr_t)v); \
}
static pthread_mutex_t g_lock1 = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t g_lock2 = PTHREAD_MUTEX_INITIALIZER;
static sem_t g_inver_sem1;
static sem_t g_inver_sem2;
static int inver_thread_a(void)
{
EXPECT_ZERO(pthread_mutex_lock(&g_lock1));
EXPECT_ZERO(pthread_mutex_lock(&g_lock2));
EXPECT_ZERO(pthread_mutex_unlock(&g_lock2));
EXPECT_ZERO(sem_post(&g_inver_sem1));
EXPECT_ZERO(sem_wait(&g_inver_sem2));
EXPECT_ZERO(pthread_mutex_unlock(&g_lock1));
return 0;
}
THREAD_WRAPPER_VOID(inver_thread_a);
static int inver_thread_b(void)
{
EXPECT_ZERO(sem_wait(&g_inver_sem1));
EXPECT_ZERO(pthread_mutex_lock(&g_lock2));
EXPECT_EQ(pthread_mutex_trylock(&g_lock1), EBUSY);
EXPECT_ZERO(sem_post(&g_inver_sem2));
EXPECT_ZERO(pthread_mutex_unlock(&g_lock2));
return 0;
}
THREAD_WRAPPER_VOID(inver_thread_b);
static int test_ab_inversion(void)
{
pthread_t thread_a, thread_b;
void *rval;
EXPECT_ZERO(sem_init(&g_inver_sem1, 0, 0));
EXPECT_ZERO(sem_init(&g_inver_sem2, 0, 0));
EXPECT_ZERO(pthread_create(&thread_a, NULL, inver_thread_a_wrap, NULL));
EXPECT_ZERO(pthread_create(&thread_b, NULL, inver_thread_b_wrap, NULL));
EXPECT_ZERO(pthread_join(thread_a, &rval));
EXPECT_EQ(rval, NULL);
EXPECT_ZERO(pthread_join(thread_b, &rval));
EXPECT_EQ(rval, NULL);
EXPECT_EQ(find_recorded_error(EDEADLK), 1);
EXPECT_ZERO(sem_destroy(&g_inver_sem1));
EXPECT_ZERO(sem_destroy(&g_inver_sem2));
clear_recorded_errors();
return 0;
}
static int test_destroy_while_same_thread_has_locked(void)
{
pthread_mutex_t mutex;
EXPECT_ZERO(pthread_mutex_init(&mutex, NULL));
EXPECT_ZERO(pthread_mutex_lock(&mutex));
EXPECT_EQ(pthread_mutex_destroy(&mutex), EBUSY);
EXPECT_EQ(find_recorded_error(EBUSY), 1);
EXPECT_ZERO(pthread_mutex_unlock(&mutex));
EXPECT_ZERO(pthread_mutex_destroy(&mutex));
clear_recorded_errors();
return 0;
}
static sem_t g_test_destroy_sem1;
static sem_t g_test_destroy_sem2;
static pthread_mutex_t g_test_destroy_mutex = PTHREAD_MUTEX_INITIALIZER;
static int test_destroy_helper1(void)
{
EXPECT_ZERO(pthread_mutex_lock(&g_test_destroy_mutex));
EXPECT_ZERO(sem_post(&g_test_destroy_sem1));
EXPECT_ZERO(sem_wait(&g_test_destroy_sem2));
EXPECT_ZERO(pthread_mutex_unlock(&g_test_destroy_mutex));
return 0;
}
THREAD_WRAPPER_VOID(test_destroy_helper1);
static int test_destroy_while_other_thread_has_locked(void)
{
pthread_t thread_c;
void *rval;
EXPECT_ZERO(sem_init(&g_test_destroy_sem1, 0, 0));
EXPECT_ZERO(sem_init(&g_test_destroy_sem2, 0, 0));
EXPECT_ZERO(pthread_create(&thread_c, NULL,
test_destroy_helper1_wrap, NULL));
sem_wait(&g_test_destroy_sem1);
EXPECT_EQ(pthread_mutex_destroy(&g_test_destroy_mutex), EBUSY);
EXPECT_EQ(find_recorded_error(EBUSY), 1);
sem_post(&g_test_destroy_sem2);
EXPECT_ZERO(pthread_join(thread_c, &rval));
EXPECT_EQ(rval, NULL);
EXPECT_ZERO(pthread_mutex_destroy(&g_test_destroy_mutex));
EXPECT_ZERO(sem_destroy(&g_test_destroy_sem1));
EXPECT_ZERO(sem_destroy(&g_test_destroy_sem2));
clear_recorded_errors();
return 0;
}
static sem_t g_test_bad_unlock_sem1;
static sem_t g_test_bad_unlock_sem2;
static pthread_mutex_t g_test_bad_unlock_mutex;
static int test_bad_unlock_helper1(void)
{
EXPECT_ZERO(pthread_mutex_lock(&g_test_bad_unlock_mutex));
EXPECT_ZERO(sem_post(&g_test_bad_unlock_sem1));
EXPECT_ZERO(sem_wait(&g_test_bad_unlock_sem2));
EXPECT_ZERO(pthread_mutex_unlock(&g_test_bad_unlock_mutex));
return 0;
}
THREAD_WRAPPER_VOID(test_bad_unlock_helper1);
static int test_bad_unlock(void)
{
pthread_t thread_d;
void *rval;
EXPECT_ZERO(sem_init(&g_test_bad_unlock_sem1, 0, 0));
EXPECT_ZERO(sem_init(&g_test_bad_unlock_sem2, 0, 0));
EXPECT_ZERO(pthread_mutex_init(&g_test_bad_unlock_mutex, NULL));
EXPECT_ZERO(pthread_create(&thread_d, NULL,
test_bad_unlock_helper1_wrap, NULL));
sem_wait(&g_test_bad_unlock_sem1);
EXPECT_EQ(pthread_mutex_unlock(&g_test_bad_unlock_mutex), EPERM);
EXPECT_EQ(find_recorded_error(EPERM), 1);
sem_post(&g_test_bad_unlock_sem2);
EXPECT_ZERO(pthread_join(thread_d, &rval));
EXPECT_EQ(rval, NULL);
EXPECT_ZERO(pthread_mutex_destroy(&g_test_bad_unlock_mutex));
EXPECT_ZERO(sem_destroy(&g_test_bad_unlock_sem1));
EXPECT_ZERO(sem_destroy(&g_test_bad_unlock_sem2));
clear_recorded_errors();
return 0;
}
#define MAX_BIG_INVERSION_LOCKS 1024
static pthread_mutex_t g_locks[MAX_BIG_INVERSION_LOCKS];
static sem_t g_inver_sem[3];
static unsigned int g_bigenv_threads;
static int big_inversion_thread(int idx)
{
unsigned int i;
int next;
next = (idx + 1) % g_bigenv_threads;
EXPECT_ZERO(pthread_mutex_lock(&g_locks[idx]));
EXPECT_ZERO(sem_post(&g_inver_sem[0]));
if (idx == 0) {
for (i = 0; i < g_bigenv_threads - 1; i++) {
EXPECT_ZERO(sem_wait(&g_inver_sem[2]));
}
EXPECT_EQ(pthread_mutex_trylock(&g_locks[next]), EBUSY);
EXPECT_EQ(find_recorded_error(EDEADLK), 1);
} else {
EXPECT_ZERO(sem_wait(&g_inver_sem[1]));
EXPECT_EQ(pthread_mutex_trylock(&g_locks[next]), EBUSY);
EXPECT_ZERO(sem_post(&g_inver_sem[2]));
EXPECT_ZERO(pthread_mutex_lock(&g_locks[next]));
EXPECT_ZERO(pthread_mutex_unlock(&g_locks[next]));
}
EXPECT_ZERO(pthread_mutex_unlock(&g_locks[idx]));
return 0;
}
THREAD_WRAPPER_INT(big_inversion_thread);
static int test_big_inversion(unsigned int num_threads)
{
unsigned int i;
pthread_t thread[MAX_BIG_INVERSION_LOCKS];
void *rval;
g_bigenv_threads = num_threads;
for (i = 0; i < sizeof(g_inver_sem)/sizeof(g_inver_sem[0]); i++) {
EXPECT_ZERO(sem_init(&g_inver_sem[i], 0, 0));
}
for (i = 0; i < num_threads; i++) {
EXPECT_ZERO(pthread_mutex_init(&g_locks[i], NULL));
}
for (i = 0; i < num_threads; i++) {
EXPECT_ZERO(pthread_create(&thread[i], NULL,
big_inversion_thread_wrap, (void*)(intptr_t)i));
}
for (i = 0; i < num_threads; i++) {
EXPECT_ZERO(sem_wait(&g_inver_sem[0]));
}
for (i = 0; i < num_threads - 1; i++) {
EXPECT_ZERO(sem_post(&g_inver_sem[1]));
}
for (i = 0; i < num_threads; i++) {
EXPECT_ZERO(pthread_join(thread[i], &rval));
EXPECT_EQ(rval, NULL);
}
for (i = 0; i < num_threads; i++) {
EXPECT_ZERO(pthread_mutex_destroy(&g_locks[i]));
}
for (i = 0; i < sizeof(g_inver_sem)/sizeof(g_inver_sem[0]); i++) {
EXPECT_ZERO(sem_destroy(&g_inver_sem[i]));
}
clear_recorded_errors();
return 0;
}
static int test_take_sleeping_lock_while_holding_spin(void)
{
pthread_mutex_t mutex;
pthread_spinlock_t spin;
EXPECT_ZERO(pthread_mutex_init(&mutex, NULL));
EXPECT_ZERO(pthread_spin_init(&spin, 0));
/* taking spin lock while holding mutex-- this is ok */
EXPECT_ZERO(pthread_mutex_lock(&mutex));
EXPECT_ZERO(pthread_spin_lock(&spin));
EXPECT_ZERO(pthread_spin_unlock(&spin));
EXPECT_ZERO(pthread_mutex_unlock(&mutex));
EXPECT_EQ(find_recorded_error(EWOULDBLOCK), 0);
/* taking mutex while holding spin lock-- this is not ok */
EXPECT_ZERO(pthread_spin_lock(&spin));
EXPECT_ZERO(pthread_mutex_lock(&mutex));
EXPECT_ZERO(pthread_mutex_unlock(&mutex));
EXPECT_ZERO(pthread_spin_unlock(&spin));
EXPECT_EQ(find_recorded_error(EWOULDBLOCK), 1);
/* we don't whine about the same problem more than once-- it would
* flood the logs */
EXPECT_ZERO(pthread_spin_lock(&spin));
EXPECT_ZERO(pthread_mutex_lock(&mutex));
EXPECT_ZERO(pthread_mutex_unlock(&mutex));
EXPECT_ZERO(pthread_spin_unlock(&spin));
EXPECT_EQ(find_recorded_error(EWOULDBLOCK), 0);
EXPECT_ZERO(pthread_spin_destroy(&spin));
EXPECT_ZERO(pthread_mutex_destroy(&mutex));
clear_recorded_errors();
return 0;
}
static pthread_cond_t g_cond1;
static pthread_mutex_t g_cslock1;
static int cond_signaller1(void)
{
EXPECT_ZERO(pthread_mutex_lock(&g_cslock1));
EXPECT_ZERO(pthread_cond_signal(&g_cond1));
EXPECT_ZERO(pthread_mutex_unlock(&g_cslock1));
return 0;
}
THREAD_WRAPPER_VOID(cond_signaller1);
static int do_pthread_cond_wait(pthread_cond_t *__restrict cond,
pthread_mutex_t *__restrict mutex,
const struct timespec *__restrict ts)
{
// The main reason for testing both pthread_cond_wait and
// pthread_cond_timedwait here is to shake out bugs in our usage of
// dlsym and friends.
if (!ts) {
return pthread_cond_wait(cond, mutex);
}
return pthread_cond_timedwait(cond, mutex, ts);
}
static int test_invalid_cond_wait(const struct timespec *ts)
{
pthread_t thread;
EXPECT_ZERO(pthread_mutex_init(&g_cslock1, NULL));
EXPECT_ZERO(pthread_cond_init(&g_cond1, NULL));
/* We must not call pthread_cond_wait on a mutex we don't actually
* hold. */
EXPECT_EQ(do_pthread_cond_wait(&g_cond1, &g_cslock1, ts), EPERM);
EXPECT_EQ(find_recorded_error(EPERM), 1);
/* Here is an example of using the API correctly. */
EXPECT_ZERO(pthread_mutex_lock(&g_cslock1));
EXPECT_ZERO(pthread_create(&thread, NULL,
cond_signaller1_wrap, NULL));
EXPECT_EQ(do_pthread_cond_wait(&g_cond1, &g_cslock1, ts), 0);
EXPECT_ZERO(pthread_mutex_unlock(&g_cslock1));
EXPECT_ZERO(pthread_join(thread, NULL));
/* test that we can destroy the pthread_cond and re-create it. */
EXPECT_ZERO(pthread_cond_destroy(&g_cond1));
EXPECT_ZERO(pthread_cond_init(&g_cond1, NULL));
EXPECT_ZERO(pthread_cond_destroy(&g_cond1));
EXPECT_ZERO(pthread_mutex_destroy(&g_cslock1));
return 0;
}
static int test_recursion_on_nonrecursive(void)
{
pthread_mutexattr_t attr;
pthread_mutex_t mutex;
int ty = PTHREAD_MUTEX_NORMAL;
EXPECT_ZERO(pthread_mutexattr_init(&attr));
EXPECT_ZERO(pthread_mutexattr_settype(&attr, ty));
EXPECT_ZERO(pthread_mutex_init(&mutex, &attr));
EXPECT_ZERO(pthread_mutex_lock(&mutex));
EXPECT_EQ(pthread_mutex_trylock(&mutex), EBUSY);
EXPECT_EQ(find_recorded_error(EDEADLK), 1);
EXPECT_ZERO(pthread_mutex_unlock(&mutex));
EXPECT_ZERO(pthread_mutexattr_destroy(&attr));
EXPECT_ZERO(pthread_mutex_destroy(&mutex));
return 0;
}
static pthread_cond_t g_tbcw_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t g_tbcw_lock1 = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t g_tbcw_lock2 = PTHREAD_MUTEX_INITIALIZER;
static int tbcw_thread1(void)
{
int ret;
pthread_mutex_lock(&g_tbcw_lock1);
ret = pthread_cond_wait(&g_tbcw_cond, &g_tbcw_lock1);
pthread_mutex_unlock(&g_tbcw_lock1);
if (ret) {
pthread_mutex_lock(&g_tbcw_lock2);
pthread_cond_signal(&g_tbcw_cond);
pthread_mutex_unlock(&g_tbcw_lock2);
}
return ret;
}
THREAD_WRAPPER_VOID(tbcw_thread1);
static int tbcw_thread2(void)
{
int ret;
pthread_mutex_lock(&g_tbcw_lock2);
ret = pthread_cond_wait(&g_tbcw_cond, &g_tbcw_lock2);
pthread_mutex_unlock(&g_tbcw_lock2);
if (ret) {
pthread_mutex_lock(&g_tbcw_lock1);
pthread_cond_signal(&g_tbcw_cond);
pthread_mutex_unlock(&g_tbcw_lock1);
}
return ret;
}
THREAD_WRAPPER_VOID(tbcw_thread2);
static int test_bad_cond_wait(void)
{
pthread_t thread_1, thread_2;
void *rval1 = NULL, *rval2 = NULL;
EXPECT_ZERO(pthread_create(&thread_1, NULL, tbcw_thread1_wrap, NULL));
EXPECT_ZERO(pthread_create(&thread_2, NULL, tbcw_thread2_wrap, NULL));
EXPECT_ZERO(pthread_join(thread_1, &rval1));
EXPECT_ZERO(pthread_join(thread_2, &rval2));
if (rval1 == NULL) {
EXPECT_NOT_EQ(rval2, NULL);
} else if (rval2 == NULL) {
EXPECT_NOT_EQ(rval1, NULL);
} else {
fprintf(stderr, "expected one of the threads to fail.");
return EINVAL;
}
EXPECT_EQ(find_recorded_error(EINVAL), 1);
clear_recorded_errors();
return 0;
}
int main(void)
{
struct timespec ts;
set_error_cb(record_error);
EXPECT_ZERO(test_ab_inversion());
EXPECT_ZERO(test_destroy_while_same_thread_has_locked());
EXPECT_ZERO(test_destroy_while_other_thread_has_locked());
EXPECT_ZERO(test_bad_unlock());
EXPECT_ZERO(test_big_inversion(3));
EXPECT_ZERO(test_big_inversion(100));
EXPECT_ZERO(test_take_sleeping_lock_while_holding_spin());
EXPECT_ZERO(test_invalid_cond_wait(NULL));
EXPECT_ZERO(test_invalid_cond_wait(NULL));
get_current_timespec(&ts);
ts.tv_sec += 600;
EXPECT_ZERO(test_invalid_cond_wait(&ts));
EXPECT_ZERO(test_recursion_on_nonrecursive());
EXPECT_ZERO(test_bad_cond_wait());
return EXIT_SUCCESS;
}