zero_attach.c File Reference

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Functions
int	wait_for_attach_and_loop (void)
int	main (int argc, char **argv)

Function Documentation

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 47 of file zero_attach.c.

{
    int status, retval, num_tests = 1, tmp;
    int EventSet1 = PAPI_NULL;
    int PAPI_event, mask1;
    int num_events1;
    long long **values;
    long long elapsed_us, elapsed_cyc, elapsed_virt_us, elapsed_virt_cyc;
    char event_name[PAPI_MAX_STR_LEN], add_event_str[PAPI_MAX_STR_LEN];
    const PAPI_component_info_t *cmpinfo;
    pid_t pid;

    /* Set TESTS_QUIET variable */
    tests_quiet( argc, argv );

    /* Initialize the PAPI library */
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if ( retval != PAPI_VER_CURRENT ) {
       test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }

    if ( ( cmpinfo = PAPI_get_component_info( 0 ) ) == NULL ) {
       test_fail( __FILE__, __LINE__, "PAPI_get_component_info", 0 );
    }

    if ( cmpinfo->attach == 0 ) {
       test_skip( __FILE__, __LINE__, 
              "Platform does not support attaching", 0 );
    }

    pid = fork(  );
    if ( pid < 0 ) {
       test_fail( __FILE__, __LINE__, "fork()", PAPI_ESYS );
    }
    if ( pid == 0 ) {
       exit( wait_for_attach_and_loop(  ) );
    }

    /* add PAPI_TOT_CYC and one of the events in 
       PAPI_FP_INS, PAPI_FP_OPS or PAPI_TOT_INS, 
       depending on the availability of the event 
       on the platform                            */
    EventSet1 = add_two_events( &num_events1, &PAPI_event, &mask1 );

    if ( cmpinfo->attach_must_ptrace ) {
        if ( ptrace( PTRACE_ATTACH, pid, NULL, NULL ) == -1 ) {
            perror( "ptrace(PTRACE_ATTACH)" );
            return 1;
        }
        if ( waitpid( pid, &status, 0 ) == -1 ) {
            perror( "waitpid()" );
            exit( 1 );
        }
        if ( WIFSTOPPED( status ) == 0 )
            test_fail( __FILE__, __LINE__,
                       "Child process didnt return true to WIFSTOPPED", 0 );
    }

    retval = PAPI_attach( EventSet1, ( unsigned long ) pid );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_attach", retval );

    retval = PAPI_event_code_to_name( PAPI_event, event_name );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_event_code_to_name", retval );
    sprintf( add_event_str, "PAPI_add_event[%s]", event_name );

    /* num_events1 is greater than num_events2 so don't worry. */

    values = allocate_test_space( num_tests, num_events1 );

    elapsed_us = PAPI_get_real_usec(  );
    elapsed_cyc = PAPI_get_real_cyc(  );
    elapsed_virt_us = PAPI_get_virt_usec(  );
    elapsed_virt_cyc = PAPI_get_virt_cyc(  );

    /* Wait for the SIGSTOP. */
    if ( cmpinfo->attach_must_ptrace ) {
        if ( ptrace( PTRACE_CONT, pid, NULL, NULL ) == -1 ) {
            perror( "ptrace(PTRACE_CONT)" );
            return 1;
        }
        if ( waitpid( pid, &status, 0 ) == -1 ) {
            perror( "waitpid()" );
            exit( 1 );
        }
        if ( WIFSTOPPED( status ) == 0 ) {
            test_fail( __FILE__, __LINE__,
                       "Child process didn't return true to WIFSTOPPED", 0 );
        }
        if ( WSTOPSIG( status ) != SIGSTOP ) {
            test_fail( __FILE__, __LINE__,
                       "Child process didn't stop on SIGSTOP", 0 );
        }
    }

    retval = PAPI_start( EventSet1 );
    if ( retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    }

    /* Wait for the SIGSTOP. */
    if ( cmpinfo->attach_must_ptrace ) {
        if ( ptrace( PTRACE_CONT, pid, NULL, NULL ) == -1 ) {
            perror( "ptrace(PTRACE_CONT)" );
            return 1;
        }
        if ( waitpid( pid, &status, 0 ) == -1 ) {
            perror( "waitpid()" );
            exit( 1 );
        }
        if ( WIFSTOPPED( status ) == 0 ) {
            test_fail( __FILE__, __LINE__,
                       "Child process didn't return true to WIFSTOPPED", 0 );
        }
        if ( WSTOPSIG( status ) != SIGSTOP ) {
            test_fail( __FILE__, __LINE__,
                       "Child process didn't stop on SIGSTOP", 0 );
        }
    }

    elapsed_virt_us = PAPI_get_virt_usec(  ) - elapsed_virt_us;
    elapsed_virt_cyc = PAPI_get_virt_cyc(  ) - elapsed_virt_cyc;
    elapsed_us = PAPI_get_real_usec(  ) - elapsed_us;
    elapsed_cyc = PAPI_get_real_cyc(  ) - elapsed_cyc;

    retval = PAPI_stop( EventSet1, values[0] );
    if ( retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
    }

    remove_test_events( &EventSet1, mask1 );

    if ( cmpinfo->attach_must_ptrace ) {
        if ( ptrace( PTRACE_CONT, pid, NULL, NULL ) == -1 ) {
            perror( "ptrace(PTRACE_CONT)" );
            return 1;
        }
    }

    if ( waitpid( pid, &status, 0 ) == -1 ) {
        perror( "waitpid()" );
        exit( 1 );
    }
    if ( WIFEXITED( status ) == 0 ) {
        test_fail( __FILE__, __LINE__,
                   "Child process didn't return true to WIFEXITED", 0 );
    }

    if (!TESTS_QUIET) {
        printf( "Test case: 3rd party attach start, stop.\n" );
        printf( "-----------------------------------------------\n" );
        tmp = PAPI_get_opt( PAPI_DEFDOM, NULL );
        printf( "Default domain is: %d (%s)\n", tmp,
            stringify_all_domains( tmp ) );
        tmp = PAPI_get_opt( PAPI_DEFGRN, NULL );
        printf( "Default granularity is: %d (%s)\n", tmp,
            stringify_granularity( tmp ) );
        printf( "Using %d iterations of c += a*b\n", NUM_FLOPS );
        printf( "-------------------------------------------------------------------------\n" );

        printf( "Test type    : \t           1\n" );

        sprintf( add_event_str, "%-12s : \t", event_name );
        printf( TAB1, add_event_str, values[0][1] );
        printf( TAB1, "PAPI_TOT_CYC : \t", values[0][0] );
        printf( TAB1, "Real usec    : \t", elapsed_us );
        printf( TAB1, "Real cycles  : \t", elapsed_cyc );
        printf( TAB1, "Virt usec    : \t", elapsed_virt_us );
        printf( TAB1, "Virt cycles  : \t", elapsed_virt_cyc );

        printf( "-------------------------------------------------------------------------\n" );

        printf( "Verification: none\n" );
    }

    test_pass( __FILE__ );

    return 0;
}

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wait_for_attach_and_loop()

int wait_for_attach_and_loop

(

void

)

Definition at line 38 of file zero_attach.c.

{
    kill( getpid(  ), SIGSTOP );
    do_flops( NUM_FLOPS );
    kill( getpid(  ), SIGSTOP );
    return 0;
}

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