/*

 *  Test PAPI with fork() and exec().

 */

#include <sys/time.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include "papi.h"

#include "papi_test.h"

#define MAX_EVENTS  3

static int Event[MAX_EVENTS] = {

	PAPI_TOT_CYC,

	PAPI_FP_INS,

	PAPI_FAD_INS,

};

static int Threshold[MAX_EVENTS] = {

	8000000,

	4000000,

	4000000,

};

static int num_events = 1;

static int EventSet = PAPI_NULL;

static const char *name = "unknown";

static struct timeval start, last;

static long count, total;

static void

my_handler( int EventSet, void *pc, long long ovec, void *context )

{

	( void ) EventSet;

	( void ) pc;

	( void ) ovec;

	( void ) context;

	count++;

	total++;

}

static void

zero_count( void )

{

	gettimeofday( &start, NULL );

	last = start;

	count = 0;

	total = 0;

}

static void

print_here( const char *str) {

	if (!TESTS_QUIET) printf("[%d] %s, %s\n", getpid(), name, str);

}

static void

print_rate( const char *str )

{

	static int last_count = -1;

	struct timeval now;

	double st_secs, last_secs;

	gettimeofday( &now, NULL );

	st_secs = ( double ) ( now.tv_sec - start.tv_sec )

		+ ( ( double ) ( now.tv_usec - start.tv_usec ) ) / 1000000.0;

	last_secs = ( double ) ( now.tv_sec - last.tv_sec )

		+ ( ( double ) ( now.tv_usec - last.tv_usec ) ) / 1000000.0;

	if ( last_secs <= 0.001 )

		last_secs = 0.001;

	if (!TESTS_QUIET) {

		printf( "[%d] %s, time = %.3f, total = %ld, last = %ld, rate = %.1f/sec\n",

			getpid(  ), str, st_secs, total, count,

			( ( double ) count ) / last_secs );

	}

	if ( last_count != -1 ) {

		if ( count < .1 * last_count ) {

			test_fail( name, __LINE__, "Interrupt rate changed!", 1 );

			exit( 1 );

		}

	}

	last_count = ( int ) count;

	count = 0;

	last = now;

}

static void

do_cycles( int program_time )

{

	struct timeval start, now;

	double x, sum;

	gettimeofday( &start, NULL );

	for ( ;; ) {

		sum = 1.0;

		for ( x = 1.0; x < 250000.0; x += 1.0 )

			sum += x;

		if ( sum < 0.0 )

			printf( "==>>  SUM IS NEGATIVE !!  <<==\n" );

		gettimeofday( &now, NULL );

		if ( now.tv_sec >= start.tv_sec + program_time )

			break;

	}

}

static void

my_papi_start( void )

{

	int ev;

	EventSet = PAPI_NULL;

	if ( PAPI_create_eventset( &EventSet ) != PAPI_OK )

		test_fail( name, __LINE__, "PAPI_create_eventset failed", 1 );

	for ( ev = 0; ev < num_events; ev++ ) {

		if ( PAPI_add_event( EventSet, Event[ev] ) != PAPI_OK ) {

			if (!TESTS_QUIET) printf("Trouble adding event\n");

			test_skip( name, __LINE__, "PAPI_add_event failed", 1 );

		}

	}

	for ( ev = 0; ev < num_events; ev++ ) {

		if ( PAPI_overflow( EventSet, Event[ev], Threshold[ev], 0, my_handler )

			 != PAPI_OK ) {

			test_fail( name, __LINE__, "PAPI_overflow failed", 1 );

		}

	}

	if ( PAPI_start( EventSet ) != PAPI_OK )

		test_fail( name, __LINE__, "PAPI_start failed", 1 );

}

static void

run( const char *str, int len )

{

	int n;

	for ( n = 1; n <= len; n++ ) {

		do_cycles( 1 );

		print_rate( str );

	}

}

int

main( int argc, char **argv )

{

	char buf[100];

	int quiet,retval;

	/* Used to be able to set this via command line */

	num_events=1;

	/* Set TESTS_QUIET variable */

	quiet=tests_quiet( argc, argv );

	do_cycles( 1 );

	zero_count(  );

	retval=PAPI_library_init( PAPI_VER_CURRENT );

	if (retval!=PAPI_VER_CURRENT) {

		test_fail( name, __LINE__, "PAPI_library_init failed", 1 );

	}

	name = argv[0];

	if (!quiet) printf( "[%d] %s, num_events = %d\n", getpid(  ), name, num_events );

	sprintf( buf, "%d", num_events );

	my_papi_start(  );

	run( name, 3 );

	print_here( "system(./burn)" );

	if ( access( "./burn", X_OK ) == 0 )

		( quiet ? system( "./burn TESTS_QUIET" ) : system( "./burn" ) );

	else if ( access( "./ctests/burn", X_OK ) == 0 )

		( quiet ? system( "./ctests/burn TESTS_QUIET" ) :

		  system( "./ctests/burn" ) );

	test_pass(__FILE__);

	return 0;

}