/***********************************************************************
* cancel.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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 OWNER 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 <stdio.h>
#include <time.h>
#include <pthread.h>
#include <errno.h>
#include "ostest.h"
static pthread_mutex_t mutex;
static pthread_cond_t cond;
static void *thread_waiter(void *parameter)
{
int status;
/* Take the mutex */
printf("%s: Taking mutex\n", __FUNCTION__);
status = pthread_mutex_lock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_lock failed, status=%d\n", __FUNCTION__, status);
}
printf("%s: Starting wait for condition\n", __FUNCTION__);
/* Are we a non-cancelable thread? Yes, set the non-cancelable state */
if (!parameter)
{
printf("%s: Setting non-cancelable\n", __FUNCTION__);
status = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_setcancelstate failed, status=%d\n", __FUNCTION__, status);
}
}
/* The wait -- we will never awaken from this. */
status = pthread_cond_wait(&cond, &mutex);
if (status != 0)
{
printf("%s: ERROR pthread_cond_wait failed, status=%d\n", __FUNCTION__, status);
}
/* Release the mutex */
printf("%s: Releasing mutex\n", __FUNCTION__);
status = pthread_mutex_unlock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_unlock failed, status=%d\n", __FUNCTION__, status);
}
/* Set the cancelable state */
printf("%s: Setting cancelable\n", __FUNCTION__);
status = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_setcancelstate failed, status=%d\n", __FUNCTION__, status);
}
printf("%s: Exit with status 0x12345678\n", __FUNCTION__);
pthread_exit((void*)0x12345678);
return NULL;
}
static void start_thread(pthread_t *waiter, int cancelable)
{
pthread_attr_t attr;
int status;
/* Initialize the mutex */
printf("%s: Initializing mutex\n", __FUNCTION__);
status = pthread_mutex_init(&mutex, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_init failed, status=%d\n", __FUNCTION__, status);
}
/* Initialize the condition variable */
printf("%s: Initializing cond\n", __FUNCTION__);
status = pthread_cond_init(&cond, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_cond_init failed, status=%d\n", __FUNCTION__, status);
}
/* Set up attributes */
status = pthread_attr_init(&attr);
if (status != 0)
{
printf("%s: pthread_attr_init failed, status=%d\n", __FUNCTION__, status);
}
status = pthread_attr_setstacksize(&attr, 16384);
if (status != 0)
{
printf("%s: pthread_attr_setstacksize failed, status=%d\n", __FUNCTION__, status);
}
/* Start the waiter thread */
printf("%s: Starting thread\n", __FUNCTION__);
status = pthread_create(waiter, NULL, thread_waiter, (void*)cancelable);
if (status != 0)
{
printf("%s: ERROR pthread_create failed, status=%d\n", __FUNCTION__, status);
}
/* Make sure that the waiter thread gets a chance to run */
printf("%s: Yielding\n", __FUNCTION__);
pthread_yield();
}
static void restart_thread(pthread_t *waiter, int cancelable)
{
int status;
/* Destroy the condition variable */
printf("%s: Destroying cond\n", __FUNCTION__);
status = pthread_cond_destroy(&cond);
if (status != 0)
{
printf("%s: ERROR pthread_cond_destroy failed, status=%d\n", __FUNCTION__, status);
}
/* Destroy the mutex */
printf("%s: Destroying mutex\n", __FUNCTION__);
status = pthread_cond_destroy(&cond);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_destroy failed, status=%d\n", __FUNCTION__, status);
}
/* Then restart the thread */
printf("%s: Re-starting thread\n", __FUNCTION__);
start_thread(waiter, cancelable);
}
void cancel_test(void)
{
pthread_t waiter;
void *result;
int status;
/* Test 1: Normal Cancel *********************************************/
/* Start the waiter thread */
printf("%s: Test 1: Normal Cancelation\n", __FUNCTION__);
printf("%s: Starting thread\n", __FUNCTION__);
start_thread(&waiter, 1);
/* Then cancel it. It should be in the pthread_cond_wait now */
printf("%s: Canceling thread\n", __FUNCTION__);
status = pthread_cancel(waiter);
if (status != 0)
{
printf("%s: ERROR pthread_cancel failed, status=%d\n", __FUNCTION__, status);
}
/* Then join to the thread to pick up the result */
printf("%s: Joining\n", __FUNCTION__);
status = pthread_join(waiter, &result);
if (status != 0)
{
printf("%s: ERROR pthread_join failed, status=%d\n", __FUNCTION__, status);
}
else
{
printf("%s: waiter exited with result=%p\n", __FUNCTION__, result);
if (result != PTHREAD_CANCELED)
{
printf("%s: ERROR expected result=%p\n", __FUNCTION__, PTHREAD_CANCELED);
}
else
{
printf("%s: PASS thread terminated with PTHREAD_CANCELED\n", __FUNCTION__);
}
}
/* Test 2: Cancel Detached Thread ************************************/
printf("%s: Test 2: Cancelation of detached thread\n", __FUNCTION__);
printf("%s: Re-starting thread\n", __FUNCTION__);
restart_thread(&waiter, 1);
/* Detach the thread */
status = pthread_detach(waiter);
if (status != 0)
{
printf("%s: ERROR pthread_detach, status=%d\n", __FUNCTION__, status);
}
/* Then cancel it. It should be in the pthread_cond_wait now */
printf("%s: Canceling thread\n", __FUNCTION__);
status = pthread_cancel(waiter);
if (status != 0)
{
printf("%s: ERROR pthread_cancel failed, status=%d\n", __FUNCTION__, status);
}
/* Join should now fail */
printf("%s: Joining\n", __FUNCTION__);
status = pthread_join(waiter, &result);
if (status == 0)
{
printf("%s: ERROR pthread_join succeeded\n", __FUNCTION__);
}
else if (status != ESRCH)
{
printf("%s: ERROR pthread_join failed but with wrong status=%d\n", __FUNCTION__, status);
}
else
{
printf("%s: PASS pthread_join failed with status=ESRCH\n", __FUNCTION__);
}
/* Test 3: Non-cancelable threads ************************************/
printf("%s: Test 3: Non-cancelable threads\n", __FUNCTION__);
printf("%s: Re-starting thread (non-cancelable)\n", __FUNCTION__);
restart_thread(&waiter, 0);
/* Then cancel it. It should be in the pthread_cond_wait now. The
* behavior here is non-standard: when the thread is at a cancelation
* point, it should be cancelable, even when cancelation is disable.
*
* The cancelation should succeed, because the cancelation is pending.
*/
printf("%s: Canceling thread\n", __FUNCTION__);
status = pthread_cancel(waiter);
if (status != 0)
{
printf("%s: ERROR pthread_cancel failed, status=%d\n", __FUNCTION__, status);
}
/* Signal the thread. It should wake up an restore the cancelable state.
* When the cancelable state is re-enabled, the thread should be canceled.
*/
status = pthread_mutex_lock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_lock failed, status=%d\n", __FUNCTION__, status);
}
status = pthread_cond_signal(&cond);
if (status != 0)
{
printf("%s: ERROR pthread_cond_signal failed, status=%d\n", __FUNCTION__, status);
}
status = pthread_mutex_unlock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_unlock failed, status=%d\n", __FUNCTION__, status);
}
}
