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/* Copyright (C) 2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <tap.h>
#include <my_sys.h>
#include <my_atomic.h>
int32 a32,b32,c32;
my_atomic_rwlock_t rwl;
pthread_attr_t thr_attr;
pthread_mutex_t mutex;
pthread_cond_t cond;
int N;
/* add and sub a random number in a loop. Must get 0 at the end */
pthread_handler_t test_atomic_add_handler(void *arg)
{
int m=*(int *)arg;
int32 x;
for (x=((int)(&m)); m ; m--)
{
x=x*m+0x87654321;
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&a32, x);
my_atomic_rwlock_wrunlock(&rwl);
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&a32, -x);
my_atomic_rwlock_wrunlock(&rwl);
}
pthread_mutex_lock(&mutex);
N--;
if (!N) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
/*
1. generate thread number 0..N-1 from b32
2. add it to a32
3. swap thread numbers in c32
4. (optionally) one more swap to avoid 0 as a result
5. subtract result from a32
must get 0 in a32 at the end
*/
pthread_handler_t test_atomic_swap_handler(void *arg)
{
int m=*(int *)arg;
int32 x;
my_atomic_rwlock_wrlock(&rwl);
x=my_atomic_add32(&b32, 1);
my_atomic_rwlock_wrunlock(&rwl);
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&a32, x);
my_atomic_rwlock_wrunlock(&rwl);
for (; m ; m--)
{
my_atomic_rwlock_wrlock(&rwl);
x=my_atomic_swap32(&c32, x);
my_atomic_rwlock_wrunlock(&rwl);
}
if (!x)
{
my_atomic_rwlock_wrlock(&rwl);
x=my_atomic_swap32(&c32, x);
my_atomic_rwlock_wrunlock(&rwl);
}
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&a32, -x);
my_atomic_rwlock_wrunlock(&rwl);
pthread_mutex_lock(&mutex);
N--;
if (!N) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
/*
same as test_atomic_add_handler, but my_atomic_add32 is emulated with
(slower) my_atomic_cas32
*/
pthread_handler_t test_atomic_cas_handler(void *arg)
{
int m=*(int *)arg, ok;
int32 x,y;
for (x=((int)(&m)); m ; m--)
{
my_atomic_rwlock_wrlock(&rwl);
y=my_atomic_load32(&a32);
my_atomic_rwlock_wrunlock(&rwl);
x=x*m+0x87654321;
do {
my_atomic_rwlock_wrlock(&rwl);
ok=my_atomic_cas32(&a32, &y, y+x);
my_atomic_rwlock_wrunlock(&rwl);
} while (!ok);
do {
my_atomic_rwlock_wrlock(&rwl);
ok=my_atomic_cas32(&a32, &y, y-x);
my_atomic_rwlock_wrunlock(&rwl);
} while (!ok);
}
pthread_mutex_lock(&mutex);
N--;
if (!N) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
void test_atomic(const char *test, pthread_handler handler, int n, int m)
{
pthread_t t;
ulonglong now=my_getsystime();
a32= 0;
b32= 0;
c32= 0;
diag("Testing %s with %d threads, %d iterations... ", test, n, m);
for (N=n ; n ; n--)
pthread_create(&t, &thr_attr, handler, &m);
pthread_mutex_lock(&mutex);
while (N)
pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
now=my_getsystime()-now;
ok(a32 == 0, "tested %s in %g secs", test, ((double)now)/1e7);
}
int main()
{
int err;
diag("N CPUs: %d", my_getncpus());
err= my_atomic_initialize();
plan(4);
ok(err == 0, "my_atomic_initialize() returned %d", err);
pthread_attr_init(&thr_attr);
pthread_attr_setdetachstate(&thr_attr,PTHREAD_CREATE_DETACHED);
pthread_mutex_init(&mutex, 0);
pthread_cond_init(&cond, 0);
my_atomic_rwlock_init(&rwl);
test_atomic("my_atomic_add32", test_atomic_add_handler, 100,1000000);
test_atomic("my_atomic_swap32", test_atomic_swap_handler, 100,1000000);
test_atomic("my_atomic_cas32", test_atomic_cas_handler, 100,1000000);
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
pthread_attr_destroy(&thr_attr);
my_atomic_rwlock_destroy(&rwl);
return exit_status();
}
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