/*
 * 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., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.

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

 
 * The steps are:
 * 
 * -> Create a thread which wait in a condition for a small time.
 * -> Another thread will signal this condition from time to time.
 * -> Another thread which loops on sending a signal to the first thread.
 * 
 */
 
 /* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
 #define _POSIX_C_SOURCE 200112L
 
 
 /********************************************************************************************/
/****************************** standard includes *****************************************/
/********************************************************************************************/
 #include <pthread.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h> 
 #include <unistd.h>

 #include <semaphore.h>
 #include <errno.h>
 #include <signal.h>
 #include <time.h>
 
/********************************************************************************************/
/******************************   Test framework   *****************************************/
/********************************************************************************************/
 #include "testfrmw.h"
 #include "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 __EMSCRIPTEN__
// See https://github.com/emscripten-core/emscripten/issues/14892
#define WITH_SYNCHRO
#endif
#ifndef VERBOSE
#define VERBOSE 2
#endif

#define INTERVAL (700) /* ns, frequency (actually, period) for the condition signaling */

/********************************************************************************************/
/***********************************    Test case   *****************************************/
/********************************************************************************************/

char do_it=1;
char woken=0;
unsigned long count_cnd_sig=0, count_cnd_wup=0;
#ifdef WITH_SYNCHRO
sem_t semsig1;
sem_t semsig2;
unsigned long count_sig=0;
#endif

sigset_t usersigs;

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

struct 
{
	pthread_mutex_t mtx;
	pthread_cond_t cnd;
} data;

/* the following function keeps on sending the signal to the process */
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 */
void sighdl1(int sig)
{
#ifdef WITH_SYNCHRO
	if (sem_post(&semsig1))
	{ UNRESOLVED(errno, "Sem_post in signal handler 1"); }
#endif
}
/* This one is registered for signal SIGUSR2 */
void sighdl2(int sig)
{
#ifdef WITH_SYNCHRO
	if (sem_post(&semsig2))
	{ UNRESOLVED(errno, "Sem_post in signal handler 2"); }
#endif	
}

/* The following function will wait on the cond
 * it does check that no error code of EINTR is returned */
void * waiter(void * arg)
{
	int ret;
	
 	/* 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");  }
	
	ret = pthread_mutex_lock(&(data.mtx));
	if (ret != 0)  {  UNRESOLVED(ret, "Unable to lock mutex in waiter thread");  }
	
	do
	{
		ret = pthread_cond_wait(&(data.cnd),&(data.mtx));
		count_cnd_wup++;
	} while ((ret == 0) && (do_it != 0));
		
	if (ret == EINTR)
	{
		FAILED("pthread_cond_wait returned EINTR");
	}
	
	if (ret != 0)
	{
		UNRESOLVED(ret, "pthread_cond_wait returned an unexpected error");
	}
	
	woken++;
	
	ret = pthread_mutex_unlock(&(data.mtx));
	if (ret != 0)  {  UNRESOLVED(ret, "Unable to unlock mutex in waiter thread");  }
	
	return NULL;
}


/* The next function will signal the condition at periodic interval */
void * worker (void * arg)
{
	int ret=0;
	
	struct timespec ts, tsrem;
	
	/* 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");  }
	
	ts.tv_sec=0;
	ts.tv_nsec= INTERVAL;
	while (ts.tv_nsec >= 1000000000)
	{
		ts.tv_nsec -= 1000000000;
		ts.tv_sec +=1;
	}
	
	while (woken == 0)
	{
		tsrem.tv_sec = ts.tv_sec;
		tsrem.tv_nsec = ts.tv_nsec;
		
		do { ret = nanosleep(&tsrem, &tsrem); }
		while ((ret != 0) && (errno == EINTR));
		
		ret = pthread_cond_signal(&(data.cnd));
		if (ret != 0)  {  UNRESOLVED(ret, "Failed to signal the condition");  }
		count_cnd_sig++;
	}
	
	return NULL;
}

/* Main function */
int main (int argc, char * argv[])
{
	int ret;
	pthread_t th_waiter, th_worker, th_sig1, th_sig2;
	thestruct arg1, arg2;
	struct sigaction sa;

	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_waiter, NULL, waiter, NULL)))
	{ UNRESOLVED(ret, "Waiter thread creation failed"); }
	
	if ((ret = pthread_create(&th_worker, NULL, worker, 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_waiter, NULL)))
	{ UNRESOLVED(ret, "Waiter thread join failed"); }
	if ((ret = pthread_join(th_worker, NULL)))
	{ UNRESOLVED(ret, "Worker thread join failed"); }

	#if VERBOSE > 0
	output("Test executed successfully.\n");
	output("  Condition was signaled %d times.\n", count_cnd_sig);
	output("  pthread_cond_wait exited %d times.\n", count_cnd_wup);
	#ifdef WITH_SYNCHRO
	output("  %d signals were sent meanwhile.\n", count_sig);
	#endif 
	#endif
	printf("Test PASS\n");
	PASSED;
}
