/*

 * File:	timer_overflow.c

 * Author:	Kevin London

 *		london@cs.utk.edu

 * Mods:	<your name here>

 * 		<your email address>

 */

/* This file looks for possible timer overflows. */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include "papi.h"

#include "papi_test.h"

#define TIMER_THRESHOLD 100

int

main( int argc, char **argv )

{

	int sleep_time = TIMER_THRESHOLD;

	int retval, i;

	long long timer;

	if ( argc > 1 ) {

		if ( !strcmp( argv[1], "TESTS_QUIET" ) )

			tests_quiet( argc, argv );

		else {

			sleep_time = atoi( argv[1] );

			if ( sleep_time <= 0 )

				sleep_time = TIMER_THRESHOLD;

		}

	}

	if ( TESTS_QUIET ) {

		/* Skip the test in TESTS_QUIET so that the main script doesn't

		 * run this as it takes a long time to check for overflow

		 */

		printf( "%-40s SKIPPED\nLine # %d\n", __FILE__, __LINE__ );

		printf( "timer_overflow takes a long time to run, run separately.\n" );

		exit( 0 );

	}

	printf( "This test will take about: %f minutes.\n",

			( float ) ( 20 * ( sleep_time / 60.0 ) ) );

	if ( ( retval =

		   PAPI_library_init( PAPI_VER_CURRENT ) ) != PAPI_VER_CURRENT )

		test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );

	timer = PAPI_get_real_usec(  );

	for ( i = 0; i <= 20; i++ ) {

		if ( timer < 0 )

			break;

		sleep( ( unsigned int ) sleep_time );

		timer = PAPI_get_real_usec(  );

	}

	if ( timer < 0 )

		test_fail( __FILE__, __LINE__, "PAPI_get_real_usec: overflow", 1 );

	else

		test_pass( __FILE__ );

	return 0;

}