/* This file checks to make sure the locking mechanisms work correctly */
/* on the platform. */
/* Platforms where the locking mechanisms are not implemented or are */
/* incorrectly implemented will fail. -KSL */
#define MAX_THREADS 256
#define APPR_TOTAL_ITER 1000000
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <math.h>
#include "papi.h"
#include "papi_test.h"
volatile long long count = 0;
volatile long long tmpcount = 0;
volatile long long thread_iter = 0;
static int quiet=0;
void
lockloop( int iters, volatile long long *mycount )
{
int i;
for ( i = 0; i < iters; i++ ) {
PAPI_lock( PAPI_USR1_LOCK );
*mycount = *mycount + 1;
PAPI_unlock( PAPI_USR1_LOCK );
}
}
void *
Slave( void *arg )
{
long long duration;
duration = PAPI_get_real_usec( );
lockloop( thread_iter, &count );
duration = PAPI_get_real_usec( ) - duration;
if (!quiet) {
printf("%f lock/unlocks per us\n",
(float)thread_iter/(float)duration);
}
pthread_exit( arg );
}
int
main( int argc, char **argv )
{
pthread_t slaves[MAX_THREADS];
int rc, i, nthr;
int retval;
const PAPI_hw_info_t *hwinfo = NULL;
/* Set TESTS_QUIET variable */
quiet = tests_quiet( argc, argv );
retval = PAPI_library_init( PAPI_VER_CURRENT );
if (retval != PAPI_VER_CURRENT ) {
test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
}
hwinfo = PAPI_get_hardware_info( );
if (hwinfo == NULL ) {
test_fail( __FILE__, __LINE__, "PAPI_get_hardware_info", 2 );
}
retval = PAPI_thread_init((unsigned long (*)(void)) ( pthread_self ) );
if ( retval != PAPI_OK ) {
if ( retval == PAPI_ECMP ) {
test_skip( __FILE__, __LINE__,
"PAPI_thread_init", retval );
}
else {
test_fail( __FILE__, __LINE__,
"PAPI_thread_init", retval );
}
}
if ( hwinfo->ncpu > MAX_THREADS ) {
nthr = MAX_THREADS;
}
else {
nthr = hwinfo->ncpu;
}
/* Scale the per thread work to keep the serial runtime about the same. */
thread_iter = APPR_TOTAL_ITER/sqrt(nthr);
if (!quiet) {
printf( "Creating %d threads, %lld lock/unlock\n",
nthr , thread_iter);
}
for ( i = 0; i < nthr; i++ ) {
rc = pthread_create( &slaves[i], NULL, Slave, NULL );
if ( rc ) {
retval = PAPI_ESYS;
test_fail( __FILE__, __LINE__,
"pthread_create", retval );
}
}
for ( i = 0; i < nthr; i++ ) {
pthread_join( slaves[i], NULL );
}
if (!quiet) {
printf( "Expected: %lld Received: %lld\n",
( long long ) nthr * thread_iter,
count );
}
if ( nthr * thread_iter != count ) {
test_fail( __FILE__, __LINE__, "Thread Locks", 1 );
}
test_pass( __FILE__ );
return 0;
}