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/*___INFO__MARK_BEGIN__*/
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the Sun Industry Standards Source License Version 1.2
*
* Sun Microsystems Inc., March, 2001
*
*
* Sun Industry Standards Source License Version 1.2
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.2 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://gridengine.sunsource.net/Gridengine_SISSL_license.html
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2003 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
************************************************************************/
/*___INFO__MARK_END__*/
#include <unistd.h>
#include <stdio.h>
#include "test_sge_lock_main.h"
#include "uti/sge_lock.h"
#include "uti/sge_time.h"
#define THREAD_COUNT 8
#define THREAD_RUN_TIME 15
static int thread_count;
static u_long32 maxlocks;
static u_long32 results[THREAD_COUNT];
static void *thread_function(void *anArg);
void set_thread_count(int count)
{
thread_count = 0;
return;
}
int get_thrd_demand(void)
{
long p = THREAD_COUNT; /* max num of threads */
return (int)p;
}
void *(*get_thrd_func(void))(void *anArg)
{
return thread_function;
}
void *get_thrd_func_arg(void)
{
return NULL;
}
static void *thread_function(void *anArg)
{
u_long32 start = sge_get_gmt();
u_long32 count = 0;
int thread_id = thread_count++;
bool read_thread = true;
bool do_loop = true;
DENTER(TOP_LAYER, "thread_function");
while (do_loop) {
/*
only the first thread is a write thread. We want to see if it starves from lock
with some other competing read threads
*/
if (thread_id == 0) {
read_thread = false;
SGE_LOCK(LOCK_GLOBAL, LOCK_WRITE);
sge_usleep(1);
SGE_UNLOCK(LOCK_GLOBAL, LOCK_WRITE);
} else {
SGE_LOCK(LOCK_GLOBAL, LOCK_READ);
sge_usleep(1);
SGE_UNLOCK(LOCK_GLOBAL, LOCK_READ);
}
count++;
if (sge_get_gmt() - start >= THREAD_RUN_TIME) {
break;
}
}
results[thread_id] = count;
printf("%s thread %d got "sge_U32CFormat" times the lock\n", read_thread?"read":"write", thread_id, count);
DRETURN(NULL);
}
static int is_in_tolerance(u_long32 value1, u_long32 value2, int accepted_tolerance) {
u_long32 first, second;
int ret = 0;
if (value1 > value2) {
first = value1;
second = value2;
} else {
first = value2;
second = value1;
}
if (first/second > accepted_tolerance) {
printf("error: tolerance is %d, expected was a max. of %d\n", (int)(first/second), accepted_tolerance);
ret = 1;
}
return ret;
}
int validate(int thread_count) {
u_long32 sum = 0;
u_long32 mean;
int i;
int ret = 0;
/* compute mean value */
for (i=0; i < thread_count; i++) {
sum += results[i];
}
mean = sum/thread_count;
/* every thread should got the same lock amount. We accept a tolerance of 50% */
for (i=0; i < thread_count; i++) {
if (is_in_tolerance(results[i], mean, 50) != 0) {
ret = 1;
break;
}
}
/* for more than one thread we expact every thread had half of the locks then
the run with just one thread */
if (ret == 0) {
if (thread_count == 1) {
printf("set max locks to "sge_U32CFormat"\n", mean);
maxlocks = mean;
} else {
for (i=0; i < thread_count; i++) {
if (is_in_tolerance(results[i]*2, maxlocks, 50) != 0) {
#if !defined(DARWIN) && !defined(AIX)
/* pthreads on darwin and aix scales very bad and this test fail */
ret = 1;
break;
#endif
}
}
}
}
return ret;
}
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