/*
 * 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:
 * If a signal is delivered to a thread waiting for a mutex,
 * upon return from the signal handler the thread resumes
 * waiting for the mutex as if it had not been interrupted.

 * The steps are:
 * -> Create a child thread
 * -> Child registers a signal handler
 * -> Child tries to lock a mutex owned by another thread
 * -> A signal is sent to the child
 * -> Check that the signal handler executes and then that the thread still
          waits for the mutex.
 * -> Release the mutex and check that the child takes it.
 * -> Do all of this several times with different mutex attributes
 *
 * The test shall be considered to FAIL if it hangs!
 * a call to alarm() might eventually be added but this is a problem under high
 * system stress.
 */

 /*
  * - adam.li@intel.com 2004-05-13
  *   Add to PTS. Please refer to http://nptl.bullopensource.org/phpBB/
  *   for general information
  */

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

/********************************************************************************************/
/***********************************    Test case   *****************************************/
/********************************************************************************************/
static pthread_mutex_t mtx[5];
static sem_t semsig, semstart;
static int ctrl = 0;

/*********  signal handler  **********/
static void sighdl(int sig PTS_ATTRIBUTE_UNUSED)
{
	if (sem_post(&semsig)) {
		UNRESOLVED(errno, "Sem_post in signal handler");
	}
}

/********** thread *********/
static void *threaded(void *arg PTS_ATTRIBUTE_UNUSED)
{
	int ret, i;

	/* We register the signal handler */
	struct sigaction sa;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;
	sa.sa_handler = sighdl;
	if ((ret = sigaction(SIGUSR1, &sa, NULL))) {
		UNRESOLVED(ret, "Unable to register signal handler");
	}

	/* Start the real work */
	for (i = 0; i < 5; i++) {	/* We'll do this with the 5 kinds of mutex */
		if (sem_post(&semstart)) {	/* Tell the father we are ready */
			UNRESOLVED(errno, "Sem post in thread");
		}

		if ((ret = pthread_mutex_lock(&mtx[i]))) {	/* Attempt to lock the mutex */
			UNRESOLVED(ret, "Mutex lock failed in thread");
		}

		ctrl++;		/* Notify the main we have passed the lock */

		if ((ret = pthread_mutex_unlock(&mtx[i]))) {	/* We don't need the mutex anymore */
			UNRESOLVED(ret, "Mutex unlock failed in thread");
		}
	}
	return NULL;
}

/********* main ********/
int main(void)
{
	int ret, i, j;
	pthread_t th;
	pthread_mutexattr_t ma[4], *pma[5];
	pma[4] = NULL;

	output_init();

	/* Initialize the mutex attributes */
	for (i = 0; i < 4; i++) {
		pma[i] = &ma[i];
		if ((ret = pthread_mutexattr_init(pma[i]))) {
			UNRESOLVED(ret, "pthread_mutexattr_init");
		}
	}
#ifndef WITHOUT_XOPEN
	if ((ret = pthread_mutexattr_settype(pma[0], PTHREAD_MUTEX_NORMAL))) {
		UNRESOLVED(ret, "pthread_mutexattr_settype (normal)");
	}
	if ((ret = pthread_mutexattr_settype(pma[1], PTHREAD_MUTEX_ERRORCHECK))) {
		UNRESOLVED(ret, "pthread_mutexattr_settype (errorcheck)");
	}
	if ((ret = pthread_mutexattr_settype(pma[2], PTHREAD_MUTEX_RECURSIVE))) {
		UNRESOLVED(ret, "pthread_mutexattr_settype (recursive)");
	}
	if ((ret = pthread_mutexattr_settype(pma[3], PTHREAD_MUTEX_DEFAULT))) {
		UNRESOLVED(ret, "pthread_mutexattr_settype (default)");
	}
#if VERBOSE >1
	output
	    ("Mutex attributes NORMAL,ERRORCHECK,RECURSIVE,DEFAULT initialized\n");
#endif
#else
#if VERBOSE > 0
	output
	    ("Mutex attributes NORMAL,ERRORCHECK,RECURSIVE,DEFAULT unavailable\n");
#endif
#endif

	/* Initialize the 5 mutex */
	for (i = 0; i < 5; i++) {
		if ((ret = pthread_mutex_init(&mtx[i], pma[i]))) {
		UNRESOLVED(ret, "pthread_mutex_init failed")}
		if ((ret = pthread_mutex_lock(&mtx[i]))) {
		UNRESOLVED(ret, "Initial pthread_mutex_lock failed")}
	}

#if VERBOSE >1
	output("Mutex objects are initialized\n");
#endif

	/* We don't need the mutex attribute objects anymore */
	for (i = 0; i < 4; i++) {
		if ((ret = pthread_mutexattr_destroy(pma[i]))) {
			UNRESOLVED(ret, "pthread_mutexattr_destroy");
		}
	}

	/* Initialize the semaphores */
	if (sem_init(&semsig, 0, 1)) {
		UNRESOLVED(errno, "Sem init (1) failed");
	}
	if (sem_init(&semstart, 0, 0)) {
		UNRESOLVED(errno, "Sem init (0) failed");
	}
#if VERBOSE >1
	output("Going to create the child thread\n");
#endif
	/* Start the child */
	if ((ret = pthread_create(&th, NULL, threaded, NULL))) {
		UNRESOLVED(ret, "Unable to create the thread");
	}
#if VERBOSE >1
	output("Child created\n");
#endif

	/* Monitor the child */
	for (i = 0; i < 5; i++) {	/* We will do this for the 5 kinds of mutex */
		if (sem_wait(&semstart)) {	/* Wait for the thread to be ready */
			UNRESOLVED(errno, "Unable to wait for the child");
		}
#if VERBOSE >1
		output("Child is ready for iteration %i\n", i + 1);
#endif

		ctrl = 0;	/* init the ctrl var */

		/* Send some signals to the thread */
		for (j = 0; j < 10; j++) {
			if ((ret = sem_wait(&semsig))) {
				UNRESOLVED(errno,
					   "Sem_wait failed from the signal handler");
			}

			sched_yield();	/* Let the child do its stuff - might be a nanosleep here */

			if ((ret = pthread_kill(th, SIGUSR1))) {
				UNRESOLVED(ret, "Pthread_kill failed");
			}
		}
#if VERBOSE >1
		output("Child was killed 10 times\n");
#endif

		/* Now check the thread is still waiting for the mutex */
		if (ctrl != 0) {
			FAILED
			    ("Killed child passed the pthread_mutex_lock without owning it");
		}
#if VERBOSE >1
		output("Control was OK\n");
#endif

		/* Unlock the mutex so the thread can proceed to the next one */
		if ((ret = pthread_mutex_unlock(&mtx[i]))) {
			UNRESOLVED(ret, "Mutex unlock in main failed");
		}
	}

#if VERBOSE >1
	output
	    ("The test has passed, we are now going to clean up everything.\n");
#endif

	/* Clean everything: the test has passed */
	if ((ret = pthread_join(th, NULL))) {
		UNRESOLVED(ret, "Unable to join the child");
	}

	for (i = 0; i < 5; i++) {
		if ((ret = pthread_mutex_destroy(&mtx[i]))) {
			UNRESOLVED(ret, "Unable to finally destroy a mutex");
		}
	}

	if (sem_destroy(&semstart)) {
		UNRESOLVED(errno, "Unable to destroy semstart semaphore");
	}

	if (sem_destroy(&semsig)) {
		UNRESOLVED(errno, "Unable to destroy semsig semaphore");
	}

	PASSED;
}