/****************************************************************************
* apps/testing/ostest/signest.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <sched.h>
#include <semaphore.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <debug.h>
#include "ostest.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define WAKEUP_SIGNAL SIGRTMIN
#define SIGVALUE_INT 42
/****************************************************************************
* Private Data
****************************************************************************/
static sem_t g_waiter_sem;
static sem_t g_interferer_sem;
static sem_t g_sem_thread_started;
static sem_t g_sem_signal_finish;
static volatile bool g_waiter_running;
static volatile bool g_interferer_running;
static volatile bool g_done;
static volatile int g_nestlevel;
static volatile int g_even_handled;
static volatile int g_odd_handled;
static volatile int g_even_nested;
static volatile int g_odd_nested;
static volatile int g_nest_level;
/****************************************************************************
* Private Functions
****************************************************************************/
static bool signest_catchable(int signo)
{
#ifdef CONFIG_SIG_SIGSTOP_ACTION
if (signo == SIGSTOP || signo == SIGCONT)
{
return false;
}
#endif
#ifdef CONFIG_SIG_SIGKILL_ACTION
if (signo == SIGKILL)
{
return false;
}
#endif
return true;
}
static void waiter_action(int signo)
{
int nest_level;
sched_lock();
nest_level = g_nest_level++;
if ((signo & 1) != 0)
{
g_odd_handled++;
if (nest_level > 0)
{
g_odd_nested++;
}
}
else
{
g_even_handled++;
if (nest_level > 0)
{
g_even_nested++;
}
}
g_nest_level = nest_level;
sched_unlock();
sem_post(&g_sem_signal_finish);
}
static FAR void *waiter_main(FAR void *arg)
{
sigset_t set;
struct sigaction act;
int ret;
int i;
printf("waiter_main: Waiter started\n");
printf("waiter_main: Setting signal mask\n");
sigemptyset(&set);
ret = sigprocmask(SIG_SETMASK, &set, NULL);
if (ret < 0)
{
printf("waiter_main: ERROR sigprocmask failed: %d\n", errno);
ASSERT(false);
return NULL;
}
printf("waiter_main: Registering signal handler\n");
act.sa_handler = waiter_action;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
for (i = 1; i < MAX_SIGNO; i += 2)
{
if (signest_catchable(i))
{
sigaddset(&act.sa_mask, i);
}
}
for (i = 1; i < MAX_SIGNO; i++)
{
if (signest_catchable(i))
{
ret = sigaction(i, &act, NULL);
if (ret < 0)
{
printf("waiter_main: WARNING sigaction failed with %d\n",
errno);
return NULL;
}
}
}
/* Now just loop until the test completes */
printf("waiter_main: Waiting on semaphore\n");
FFLUSH();
sem_post(&g_sem_thread_started);
g_waiter_running = true;
while (!g_done)
{
ret = sem_wait(&g_waiter_sem);
}
/* Just exit, the system should clean up the signal handlers */
g_waiter_running = false;
return NULL;
}
static FAR void *interfere_main(FAR void *arg)
{
/* Now just loop staying in the way as much as possible */
printf("interfere_main: Waiting on semaphore\n");
FFLUSH();
g_interferer_running = true;
while (!g_done)
{
sem_wait(&g_interferer_sem);
}
/* Just exit, the system should clean up the signal handlers */
g_interferer_running = false;
return EXIT_SUCCESS;
}
static void wait_finish(int pid, int sig)
{
struct timespec ts;
int wait_times;
wait_times = 0;
if (signest_catchable(sig))
{
wait_times++;
}
if (signest_catchable(sig + 1))
{
wait_times++;
}
while (wait_times > 0)
{
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += 2;
if (sem_timedwait(&g_sem_signal_finish, &ts) != OK)
{
sinfo("signest_test wait too long");
ASSERT(false);
}
wait_times--;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
void signest_test(void)
{
struct sched_param param;
pthread_attr_t attr;
pid_t waiterpid;
pid_t interferepid;
int total_signals;
int total_handled;
int total_nested;
int even_signals;
int odd_signals;
int ret;
int i;
int j;
sem_init(&g_waiter_sem, 0, 0);
sem_init(&g_interferer_sem, 0, 0);
sem_init(&g_sem_thread_started, 0, 0);
sem_init(&g_sem_signal_finish, 0, 0);
g_waiter_running = false;
g_interferer_running = false;
g_done = false;
g_nestlevel = 0;
even_signals = 0;
odd_signals = 0;
g_even_handled = 0;
g_odd_handled = 0;
g_even_nested = 0;
g_odd_nested = 0;
g_nest_level = 0;
ret = sched_getparam(0, ¶m);
if (ret < 0)
{
printf("signest_test: ERROR sched_getparam() failed\n");
ASSERT(false);
param.sched_priority = PTHREAD_DEFAULT_PRIORITY;
}
/* Start waiter thread */
param.sched_priority++;
printf("signest_test: Starting signal waiter task at priority %d\n",
param.sched_priority);
pthread_attr_init(&attr);
pthread_attr_setschedparam(&attr, ¶m);
pthread_attr_setstacksize(&attr, STACKSIZE);
ret = pthread_create(&waiterpid, &attr, waiter_main, NULL);
if (ret != 0)
{
printf("signest_test: ERROR failed to start waiter_main\n");
ASSERT(false);
return;
}
printf("signest_test: Started waiter_main pid=%d\n", waiterpid);
/* Start interfering thread */
param.sched_priority++;
printf("signest_test: Starting interfering task at priority %d\n",
param.sched_priority);
pthread_attr_setschedparam(&attr, ¶m);
ret = pthread_create(&interferepid, &attr, interfere_main, NULL);
if (ret != 0)
{
printf("signest_test: ERROR failed to start interfere_main\n");
ASSERT(false);
goto errout_with_waiter;
}
printf("signest_test: Started interfere_main pid=%d\n", interferepid);
/* Wait a bit */
FFLUSH();
sem_wait(&g_sem_thread_started);
/* Then signal the waiter thread with back-to-back signals, one masked
* and the other unmasked.
*/
for (i = 0; i < 10; i++)
{
for (j = 1; j < MAX_SIGNO; j += 2)
{
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
wait_finish(waiterpid, j);
/* Even then odd */
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
wait_finish(waiterpid, j);
}
}
/* Check the test results so far */
total_signals = odd_signals + even_signals;
total_handled = g_odd_handled + g_even_handled;
total_nested = g_odd_nested + g_even_nested;
printf("signest_test: Simple case:\n");
printf(" Total signalled %-3d Odd=%-3d Even=%-3d\n",
total_signals, odd_signals, even_signals);
printf(" Total handled %-3d Odd=%-3d Even=%-3d\n",
total_handled, g_odd_handled, g_even_handled);
printf(" Total nested %-3d Odd=%-3d Even=%-3d\n",
total_nested, g_odd_nested, g_even_nested);
/* Then signal the waiter thread with two signals pending. The
* sched_lock() assures that the first signal was not processed
* before the second was delivered.
*/
for (i = 0; i < 10; i++)
{
for (j = 1; j < MAX_SIGNO; j += 2)
{
/* Odd then even */
sched_lock();
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
sched_unlock();
wait_finish(waiterpid, j);
/* Even then odd */
sched_lock();
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
sched_unlock();
wait_finish(waiterpid, j);
}
}
/* Check the test results so far */
total_signals = odd_signals + even_signals;
total_handled = g_odd_handled + g_even_handled;
total_nested = g_odd_nested + g_even_nested;
printf("signest_test: With task locking\n");
printf(" Total signalled %-3d Odd=%-3d Even=%-3d\n",
total_signals, odd_signals, even_signals);
printf(" Total handled %-3d Odd=%-3d Even=%-3d\n",
total_handled, g_odd_handled, g_even_handled);
printf(" Total nested %-3d Odd=%-3d Even=%-3d\n",
total_nested, g_odd_nested, g_even_nested);
/* Then do it all over again with the interfering thread. */
for (i = 0; i < 10; i++)
{
for (j = 1; j < MAX_SIGNO; j += 2)
{
/* Odd then even */
sched_lock();
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
sem_post(&g_interferer_sem);
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
sched_unlock();
wait_finish(waiterpid, j);
/* Even then odd */
sched_lock();
if (signest_catchable(j + 1))
{
kill(waiterpid, j + 1);
even_signals++;
}
sem_post(&g_interferer_sem);
if (signest_catchable(j))
{
kill(waiterpid, j);
odd_signals++;
}
sched_unlock();
wait_finish(waiterpid, j);
}
}
/* Stop the threads */
errout_with_waiter:
g_done = true;
sem_post(&g_waiter_sem);
sem_post(&g_interferer_sem);
do
{
usleep(500 * 1000L);
}
while (g_waiter_running || g_interferer_running);
/* Check the final test results */
total_signals = odd_signals + even_signals;
total_handled = g_odd_handled + g_even_handled;
total_nested = g_odd_nested + g_even_nested;
printf("signest_test: With intefering thread\n");
printf(" Total signalled %-3d Odd=%-3d Even=%-3d\n",
total_signals, odd_signals, even_signals);
printf(" Total handled %-3d Odd=%-3d Even=%-3d\n",
total_handled, g_odd_handled, g_even_handled);
printf(" Total nested %-3d Odd=%-3d Even=%-3d\n",
total_nested, g_odd_nested, g_even_nested);
/* Check for error */
if (g_waiter_running)
{
printf("signest_test: ERROR waiter is still running\n");
ASSERT(false);
}
if (g_interferer_running)
{
printf("signest_test: ERROR interferer is still running\n");
ASSERT(false);
}
if (total_signals != total_handled)
{
printf("signest_test: ERROR only %d of %d signals were handled\n",
total_handled, total_signals);
ASSERT(false);
}
if (odd_signals != g_odd_handled)
{
printf("signest_test: ERROR only %d of %d ODD signals were handled\n",
g_odd_handled, odd_signals);
ASSERT(false);
}
if (even_signals != g_even_handled)
{
printf("signest_test: ERROR only %d of %d EVEN signals were handled\n",
g_even_handled, even_signals);
ASSERT(false);
}
if (g_odd_nested > 0)
{
printf("signest_test: ERROR %d ODD signals were nested\n",
g_odd_nested);
ASSERT(false);
}
sem_destroy(&g_waiter_sem);
sem_destroy(&g_interferer_sem);
sem_destroy(&g_sem_thread_started);
sem_destroy(&g_sem_signal_finish);
printf("signest_test: done\n");
FFLUSH();
}