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nuttx-apps/examples/ostest/cancel.c

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/****************************************************************************
* examples/ostest/cancel.c
*
* Copyright (C) 2007-2009, 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <time.h>
#include <pthread.h>
#include <errno.h>
#include "ostest.h"
/****************************************************************************
* Private Data
****************************************************************************/
static pthread_mutex_t mutex;
static pthread_cond_t cond;
/****************************************************************************
* Private Functions
****************************************************************************/
#ifdef CONFIG_PTHREAD_CLEANUP
static void thread_cleaner(FAR void *arg)
{
printf("thread_cleaner #%u\n", (unsigned int)((uintptr_t)arg));
}
#endif
static FAR void *thread_waiter(FAR void *parameter)
{
int status;
#ifdef CONFIG_PTHREAD_CLEANUP
int i;
/* Register some clean-up handlers */
for (i = 0; i < CONFIG_PTHREAD_CLEANUP_STACKSIZE ; i++)
{
pthread_cleanup_push(thread_cleaner, (FAR void *)((uintptr_t)(i+1)));
}
#endif
/* Take the mutex */
printf("thread_waiter: Taking mutex\n");
status = pthread_mutex_lock(&mutex);
if (status != 0)
{
printf("thread_waiter: ERROR pthread_mutex_lock failed, status=%d\n", status);
}
printf("thread_waiter: Starting wait for condition\n");
/* Are we a non-cancelable thread? Yes, set the non-cancelable state */
if (!parameter)
{
printf("thread_waiter: Setting non-cancelable\n");
status = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (status != 0)
{
printf("thread_waiter: ERROR pthread_setcancelstate failed, status=%d\n", status);
}
}
/* Then wait -- we will never awaken from this normaly. We will wake
* either by signal or cancellation.
*/
status = pthread_cond_wait(&cond, &mutex);
if (status != 0)
{
printf("thread_waiter: ERROR pthread_cond_wait failed, status=%d\n", status);
}
if (!parameter)
{
/* Release the mutex */
printf("thread_waiter: Releasing mutex\n");
status = pthread_mutex_unlock(&mutex);
if (status != 0)
{
printf("thread_waiter: ERROR pthread_mutex_unlock failed, status=%d\n", status);
}
/* Set the cancelable state */
printf("thread_waiter: Setting cancelable\n");
status = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (status != 0)
{
printf("thread_waiter: ERROR pthread_setcancelstate failed, status=%d\n", status);
}
}
else
{
printf("thread_waiter: ERROR pthread_cond_wait returned after being cancelled!\n");
}
printf("thread_waiter: Exit with status 0x12345678\n");
pthread_exit((pthread_addr_t)0x12345678);
return NULL;
}
#ifdef CONFIG_CANCELLATION_POINTS
static FAR void *asynch_waiter(FAR void *parameter)
{
int status;
#ifdef CONFIG_PTHREAD_CLEANUP
int i;
/* Register some clean-up handlers */
for (i = 0; i < CONFIG_PTHREAD_CLEANUP_STACKSIZE ; i++)
{
pthread_cleanup_push(thread_cleaner, (FAR void *)((uintptr_t)(i+1)));
}
#endif
/* Set the non-cancelable state */
printf("asynch_waiter: Setting non-cancelable\n");
status = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (status != 0)
{
printf("asynch_waiter: ERROR pthread_setcancelstate failed, status=%d\n", status);
}
/* Set the asynchronous cancellation type */
printf("asynch_waiter: Setting synchronous cancellation type\n");
status = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
if (status != 0)
{
printf("asynch_waiter: ERROR pthread_setcanceltype failed, status=%d\n", status);
}
/* Then wait a bit. We should be canceled aynchronously while waiting, but the
* cancellation should pend becaue we are non-cancellable.
*/
usleep(250*1000);
/* We should be canceled when restore the cancelable state. */
printf("asynch_waiter: Restoring cancelable state\n");
printf("asynch_waiter: Setting cancelable\n");
status = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
/* We should not get here!!! */
if (status != 0)
{
printf("asynch_waiter: ERROR pthread_setcancelstate failed, status=%d\n", status);
}
/* Set the cancelable state */
printf("asynch_waiter: Exit with status 0x12345678\n");
pthread_exit((pthread_addr_t)0x12345678);
return NULL;
}
#endif
static void start_thread(FAR void *(*entry)(FAR void *), pthread_t *waiter, int cancelable)
{
pthread_attr_t attr;
int status;
/* Initialize the mutex */
printf("start_thread: Initializing mutex\n");
status = pthread_mutex_init(&mutex, NULL);
if (status != 0)
{
printf("start_thread: ERROR pthread_mutex_init failed, status=%d\n", status);
}
/* Initialize the condition variable */
printf("start_thread: Initializing cond\n");
status = pthread_cond_init(&cond, NULL);
if (status != 0)
{
printf("start_thread: ERROR pthread_cond_init failed, status=%d\n", status);
}
/* Set up attributes */
status = pthread_attr_init(&attr);
if (status != 0)
{
printf("start_thread: pthread_attr_init failed, status=%d\n", status);
}
status = pthread_attr_setstacksize(&attr, STACKSIZE);
if (status != 0)
{
printf("start_thread: pthread_attr_setstacksize failed, status=%d\n", status);
}
/* Start the waiter thread */
printf("start_thread: Starting thread\n");
status = pthread_create(waiter, &attr, entry, (pthread_addr_t)((uintptr_t)cancelable));
if (status != 0)
{
printf("start_thread: ERROR pthread_create failed, status=%d\n", status);
}
/* Make sure that the waiter thread gets a chance to run */
printf("start_thread: Yielding\n");
pthread_yield();
}
static void restart_thread(FAR void *(*entry)(FAR void *), pthread_t *waiter, int cancelable)
{
int status;
/* Destroy the condition variable */
printf("restart_thread: Destroying cond\n");
status = pthread_cond_destroy(&cond);
if (status != 0)
{
printf("restart_thread: ERROR pthread_cond_destroy failed, status=%d\n", status);
}
/* Destroy the mutex. Note that this relies on non-portable NuttX assumption,
* that it is possible to destroy a locked mutex owned by a cancelled thread.
*/
printf("restart_thread: Destroying mutex\n");
status = pthread_mutex_destroy(&mutex);
if (status != 0)
{
printf("restart_thread: ERROR pthread_mutex_destroy failed, status=%d\n", status);
}
/* Then restart the thread */
printf("restart_thread: Re-starting thread\n");
start_thread(entry, waiter, cancelable);
}
/****************************************************************************
* Public Functions
****************************************************************************/
void cancel_test(void)
{
pthread_t waiter;
void *result;
int status;
/* Test 1: Normal Cancel *********************************************/
/* Start the waiter thread */
printf("cancel_test: Test 1a: Normal Cancellation\n");
printf("cancel_test: Starting thread\n");
start_thread(thread_waiter, &waiter, 1);
/* Then cancel it. It should be in the usleep now -- wait bit to
* make sure.
*/
usleep(75*1000);
printf("cancel_test: Canceling thread\n");
status = pthread_cancel(waiter);
if (status != 0)
{
printf("cancel_test: ERROR pthread_cancel failed, status=%d\n", status);
}
/* Then join to the thread to pick up the result (if we don't do
* we will have a memory leak!)
*/
printf("cancel_test: Joining\n");
status = pthread_join(waiter, &result);
if (status != 0)
{
printf("cancel_test: ERROR pthread_join failed, status=%d\n", status);
}
else
{
printf("cancel_test: waiter exited with result=%p\n", result);
if (result != PTHREAD_CANCELED)
{
printf("cancel_test: ERROR expected result=%p\n", PTHREAD_CANCELED);
}
else
{
printf("cancel_test: PASS thread terminated with PTHREAD_CANCELED\n");
}
}
/* Test 2: Asynchronous Cancel ***************************************/
printf("cancel_test: Test 2: Asynchronous Cancellation\n");
#ifdef CONFIG_CANCELLATION_POINTS
/* If cancellation points were enabled, then the first test was done
* in deferred mode. Do it again it asynchronous mode.
*
* This test does not really test asynchronous cancellation (which is
* inherently dangerous), but does exercides pthread_setcanceltype().
*/
/* Start the waiter thread */
printf("cancel_test: Starting thread\n");
restart_thread(asynch_waiter, &waiter, 1);
/* Then cancel it. It should be in the pthread_cond_wait now -- wait
* bit to make sure.
*/
usleep(100*1000);
printf("cancel_test: Canceling thread\n");
status = pthread_cancel(waiter);
if (status != 0)
{
printf("cancel_test: ERROR pthread_cancel failed, status=%d\n", status);
}
/* Then join to the thread to pick up the result (if we don't do
* we will have a memory leak!)
*/
printf("cancel_test: Joining\n");
status = pthread_join(waiter, &result);
if (status != 0)
{
printf("cancel_test: ERROR pthread_join failed, status=%d\n", status);
}
else
{
printf("cancel_test: waiter exited with result=%p\n", result);
if (result != PTHREAD_CANCELED)
{
printf("cancel_test: ERROR expected result=%p\n", PTHREAD_CANCELED);
}
else
{
printf("cancel_test: PASS thread terminated with PTHREAD_CANCELED\n");
}
}
#else
printf("... Skipped\n");
#endif
/* Test 3: Cancel Detached Thread ************************************/
printf("cancel_test: Test 3: Cancellation of detached thread\n");
printf("cancel_test: Re-starting thread\n");
restart_thread(thread_waiter, &waiter, 1);
/* Detach the thread */
status = pthread_detach(waiter);
if (status != 0)
{
printf("cancel_test: ERROR pthread_detach, status=%d\n", status);
}
/* Then cancel it. It should be in the pthread_cond_wait now -- wait a
* bit to be certain.
*/
usleep(100*1000);
printf("cancel_test: Canceling thread\n");
status = pthread_cancel(waiter);
if (status != 0)
{
printf("cancel_test: ERROR pthread_cancel failed, status=%d\n", status);
}
#ifdef CONFIG_CANCELLATION_POINTS
/* If we are doing deferred cancellation, then we will have to wait a bit
* of the fallowing pthread_join() may succeed because it happens before
* before the cancellation.
*/
usleep(100*1000);
#endif
/* Join should now fail */
printf("cancel_test: Joining\n");
status = pthread_join(waiter, &result);
if (status == 0)
{
printf("cancel_test: ERROR pthread_join succeeded\n");
}
else if (status != ESRCH)
{
printf("cancel_test: ERROR pthread_join failed but with wrong status=%d\n", status);
}
else
{
printf("cancel_test: PASS pthread_join failed with status=ESRCH\n");
}
/* Test 4: Non-cancelable threads ************************************/
/* This test currently depends on signals. It doesn't have to and
* could be re-designed so that it does not depend on signals.
*/
printf("cancel_test: Test 5: Non-cancelable threads\n");
printf("cancel_test: Re-starting thread (non-cancelable)\n");
restart_thread(thread_waiter, &waiter, 0);
/* Give the thread a chance to run an to set the non-cancelable state.
* This is the dependency on signals:
*/
usleep(200*1000);
/* 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.
*/
usleep(100*1000);
printf("cancel_test: Canceling thread\n");
status = pthread_cancel(waiter);
if (status != 0)
{
printf("cancel_test: ERROR pthread_cancel failed, status=%d\n", status);
}
/* Signal the thread. It should wake up and 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("cancel_test: ERROR pthread_mutex_lock failed, status=%d\n", status);
}
status = pthread_cond_signal(&cond);
if (status != 0)
{
printf("cancel_test: ERROR pthread_cond_signal failed, status=%d\n", status);
}
status = pthread_mutex_unlock(&mutex);
if (status != 0)
{
printf("cancel_test: ERROR pthread_mutex_unlock failed, status=%d\n", status);
}
/* Then join to the thread to pick up the result (if we don't do
* we will have a memory leak!)
*/
printf("cancel_test: Joining\n");
status = pthread_join(waiter, &result);
if (status != 0)
{
printf("cancel_test: ERROR pthread_join failed, status=%d\n", status);
}
else
{
printf("cancel_test: waiter exited with result=%p\n", result);
if (result != PTHREAD_CANCELED)
{
printf("cancel_test: ERROR expected result=%p\n", PTHREAD_CANCELED);
}
else
{
printf("cancel_test: PASS thread terminated with PTHREAD_CANCELED\n");
}
}
}
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