/*
 * Copyright (c) 2004, Bull S.A..  All rights reserved.
 * Created by: Sebastien Decugis

 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 * This sample test aims to check the following assertion:
 *
 * The function does not return EINTR

 * The steps are:
 * -> A thread is killed several times while calling pthread_mutex_trylock
 * -> check that EINTR is never returned

 */

/********************************************************************************************/
/****************************** standard includes *****************************************/
/********************************************************************************************/
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <errno.h>
#include <semaphore.h>
#include <signal.h>

/********************************************************************************************/
/******************************   Test framework   *****************************************/
/********************************************************************************************/
#include "../testfrmw/testfrmw.h"
#include "../testfrmw/testfrmw.c"
 /* This header is responsible for defining the following macros:
  * UNRESOLVED(ret, descr);
  *    where descr is a description of the error and ret is an int (error code for example)
  * FAILED(descr);
  *    where descr is a short text saying why the test has failed.
  * PASSED();
  *    No parameter.
  *
  * Both three macros shall terminate the calling process.
  * The testcase shall not terminate in any other maneer.
  *
  * The other file defines the functions
  * void output_init()
  * void output(char * string, ...)
  *
  * Those may be used to output information.
  */

/********************************************************************************************/
/********************************** Configuration ******************************************/
/********************************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

#define WITH_SYNCHRO

/********************************************************************************************/
/***********************************    Test case   *****************************************/
/********************************************************************************************/
static struct _scenar {
	int m_type;		/* Mutex type to use */
	int m_pshared;		/* 0: mutex is process-private (default) ~ !0: mutex is process-shared, if supported */
	char *descr;		/* Case description */
} scenarii[] = {
	{
	PTHREAD_MUTEX_DEFAULT, 0, "Default mutex"}
#ifndef WITHOUT_XOPEN
	, {
	PTHREAD_MUTEX_NORMAL, 0, "Normal mutex"}
	, {
	PTHREAD_MUTEX_ERRORCHECK, 0, "Errorcheck mutex"}
	, {
	PTHREAD_MUTEX_RECURSIVE, 0, "Recursive mutex"}
#endif

	, {
	PTHREAD_MUTEX_DEFAULT, 1, "Pshared mutex"}
#ifndef WITHOUT_XOPEN
	, {
	PTHREAD_MUTEX_NORMAL, 1, "Pshared Normal mutex"}
	, {
	PTHREAD_MUTEX_ERRORCHECK, 1, "Pshared Errorcheck mutex"}
	, {
	PTHREAD_MUTEX_RECURSIVE, 1, "Pshared Recursive mutex"}
#endif
};

#define NSCENAR (sizeof(scenarii)/sizeof(scenarii[0]))

static char do_it = 1;
static unsigned long count_ope = 0;
#ifdef WITH_SYNCHRO
static sem_t semsig1;
static sem_t semsig2;
static unsigned long count_sig = 0;
#endif

static sigset_t usersigs;

typedef struct {
	int sig;
#ifdef WITH_SYNCHRO
	sem_t *sem;
#endif
} thestruct;

/* the following function keeps on sending the signal to the process */
static void *sendsig(void *arg)
{
	thestruct *thearg = (thestruct *) arg;
	int ret;
	pid_t process;

	process = getpid();

	/* We block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);
	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to block SIGUSR1 and SIGUSR2 in signal thread");
	}

	while (do_it) {
#ifdef WITH_SYNCHRO
		if ((ret = sem_wait(thearg->sem))) {
			UNRESOLVED(errno, "Sem_wait in sendsig");
		}
		count_sig++;
#endif

		ret = kill(process, thearg->sig);
		if (ret != 0) {
			UNRESOLVED(errno, "Kill in sendsig");
		}

	}
	return NULL;
}

/* Next are the signal handlers. */
/* This one is registered for signal SIGUSR1 */
static void sighdl1(int sig PTS_ATTRIBUTE_UNUSED)
{
#ifdef WITH_SYNCHRO
	if (sem_post(&semsig1)) {
		UNRESOLVED(errno, "Sem_post in signal handler 1");
	}
#endif
}

/* This one is registered for signal SIGUSR2 */
static void sighdl2(int sig PTS_ATTRIBUTE_UNUSED)
{
#ifdef WITH_SYNCHRO
	if (sem_post(&semsig2)) {
		UNRESOLVED(errno, "Sem_post in signal handler 2");
	}
#endif
}

/* Test function -- This one calls pthread_mutex_trylock and check that no EINTR is returned. */
static void *test(void *arg PTS_ATTRIBUTE_UNUSED)
{
	int ret = 0;
	int i;
	long pshared;
	pthread_mutex_t mtx[NSCENAR + 2];
	pthread_mutexattr_t ma[NSCENAR + 1];

	/* We don't block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_UNBLOCK, &usersigs, NULL);
	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to unblock SIGUSR1 and SIGUSR2 in worker thread");
	}

	/* System abilities */
	pshared = sysconf(_SC_THREAD_PROCESS_SHARED);

	/* Initialize the mutex objects according to the scenarii */
	for (i = 0; i < (int)NSCENAR; i++) {
		ret = pthread_mutexattr_init(&ma[i]);
		if (ret != 0) {
			UNRESOLVED(ret,
				   "[parent] Unable to initialize the mutex attribute object");
		}
#ifndef WITHOUT_XOPEN
		/* Set the mutex type */
		ret = pthread_mutexattr_settype(&ma[i], scenarii[i].m_type);
		if (ret != 0) {
			UNRESOLVED(ret, "[parent] Unable to set mutex type");
		}
#endif
		/* Set the pshared attributes, if supported */
		if ((pshared > 0) && (scenarii[i].m_pshared != 0)) {
			ret =
			    pthread_mutexattr_setpshared(&ma[i],
							 PTHREAD_PROCESS_SHARED);
			if (ret != 0) {
				UNRESOLVED(ret,
					   "[parent] Unable to set the mutex process-shared");
			}
		}

		/* Initialize the mutex */
		ret = pthread_mutex_init(&mtx[i], &ma[i]);
		if (ret != 0) {
			UNRESOLVED(ret, "[parent] Mutex init failed");
		}

	}
	/* Default mutexattr object */
	ret = pthread_mutexattr_init(&ma[i]);
	if (ret != 0) {
		UNRESOLVED(ret,
			   "[parent] Unable to initialize the mutex attribute object");
	}
	ret = pthread_mutex_init(&mtx[i], &ma[i]);
	if (ret != 0) {
		UNRESOLVED(ret, "[parent] Mutex init failed");
	}
	/* Default mutex */
	ret = pthread_mutex_init(&mtx[i + 1], NULL);
	if (ret != 0) {
		UNRESOLVED(ret, "[parent] Mutex init failed");
	}

	/* do the real testing */
	while (do_it) {
		count_ope++;

		ret = pthread_mutex_trylock(&mtx[count_ope % (NSCENAR + 2)]);
		if (ret == EINTR) {
			FAILED("EINTR was returned");
		}
		if (ret != 0) {
			UNRESOLVED(ret, "1st trylock failed");
		}

		ret = pthread_mutex_trylock(&mtx[count_ope % (NSCENAR + 2)]);
		if (ret == EINTR) {
			FAILED("EINTR was returned");
		}
		if (ret == 0) {
			ret =
			    pthread_mutex_unlock(&mtx
						 [count_ope % (NSCENAR + 2)]);
			if (ret != 0) {
				UNRESOLVED(ret, "Unlocking the mutex failed");
			}
			ret = EBUSY;
		}
		if (ret != EBUSY) {
			UNRESOLVED(ret, "Unexpected error was returned.");
		}

		ret = pthread_mutex_unlock(&mtx[count_ope % (NSCENAR + 2)]);
		if (ret != 0) {
			UNRESOLVED(ret, "Failed to unlock the mutex");
		}
	}

	/* Destroy everything */
	for (i = 0; i <= (int)NSCENAR; i++) {
		ret = pthread_mutex_destroy(&mtx[i]);
		if (ret != 0) {
			UNRESOLVED(ret, "Failed to destroy the mutex");
		}

		ret = pthread_mutexattr_destroy(&ma[i]);
		if (ret != 0) {
			UNRESOLVED(ret,
				   "Failed to destroy the mutex attr object");
		}
	}
	ret = pthread_mutex_destroy(&mtx[i]);
	if (ret != 0) {
		UNRESOLVED(ret, "Failed to destroy the mutex");
	}

	return NULL;
}

/* Main function */
int main(void)
{
	int ret;
	pthread_t th_work, th_sig1, th_sig2;
	thestruct arg1, arg2;
	struct sigaction sa;

	/* Initialize output routine */
	output_init();

	/* We need to register the signal handlers for the PROCESS */
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;
	sa.sa_handler = sighdl1;
	if ((ret = sigaction(SIGUSR1, &sa, NULL))) {
		UNRESOLVED(ret, "Unable to register signal handler1");
	}
	sa.sa_handler = sighdl2;
	if ((ret = sigaction(SIGUSR2, &sa, NULL))) {
		UNRESOLVED(ret, "Unable to register signal handler2");
	}

	/* We prepare a signal set which includes SIGUSR1 and SIGUSR2 */
	sigemptyset(&usersigs);
	ret = sigaddset(&usersigs, SIGUSR1);
	ret |= sigaddset(&usersigs, SIGUSR2);
	if (ret != 0) {
		UNRESOLVED(ret, "Unable to add SIGUSR1 or 2 to a signal set");
	}

	/* We now block the signals SIGUSR1 and SIGUSR2 for this THREAD */
	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);
	if (ret != 0) {
		UNRESOLVED(ret,
			   "Unable to block SIGUSR1 and SIGUSR2 in main thread");
	}
#ifdef WITH_SYNCHRO
	if (sem_init(&semsig1, 0, 1)) {
		UNRESOLVED(errno, "Semsig1  init");
	}
	if (sem_init(&semsig2, 0, 1)) {
		UNRESOLVED(errno, "Semsig2  init");
	}
#endif

	if ((ret = pthread_create(&th_work, NULL, test, NULL))) {
		UNRESOLVED(ret, "Worker thread creation failed");
	}

	arg1.sig = SIGUSR1;
	arg2.sig = SIGUSR2;
#ifdef WITH_SYNCHRO
	arg1.sem = &semsig1;
	arg2.sem = &semsig2;
#endif

	if ((ret = pthread_create(&th_sig1, NULL, sendsig, (void *)&arg1))) {
		UNRESOLVED(ret, "Signal 1 sender thread creation failed");
	}
	if ((ret = pthread_create(&th_sig2, NULL, sendsig, (void *)&arg2))) {
		UNRESOLVED(ret, "Signal 2 sender thread creation failed");
	}

	/* Let's wait for a while now */
	sleep(1);

	/* Now stop the threads and join them */
	do {
		do_it = 0;
	}
	while (do_it);

	if ((ret = pthread_join(th_sig1, NULL))) {
		UNRESOLVED(ret, "Signal 1 sender thread join failed");
	}
	if ((ret = pthread_join(th_sig2, NULL))) {
		UNRESOLVED(ret, "Signal 2 sender thread join failed");
	}

	if ((ret = pthread_join(th_work, NULL))) {
		UNRESOLVED(ret, "Worker thread join failed");
	}
#if VERBOSE > 0
	output("Test executed successfully.\n");
	output("  %d mutex locks.\n", count_ope);
#ifdef WITH_SYNCHRO
	output("  %d signals were sent meanwhile.\n", count_sig);
#endif
#endif
	PASSED;
}