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/* Copyright (C) 2006-2008 MySQL AB, 2008 Sun Microsystems, Inc.
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; version 2 of the License.
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 "thr_template.c"
/* at least gcc 3.4.5 and 3.4.6 (but not 3.2.3) on RHEL */
#if __GNUC__ == 3 && __GNUC_MINOR__ == 4
#define GCC_BUG_WORKAROUND volatile
#else
#define GCC_BUG_WORKAROUND
#endif
volatile uint32 b32;
volatile int32 c32;
my_atomic_rwlock_t rwl;
/* add and sub a random number in a loop. Must get 0 at the end */
pthread_handler_t test_atomic_add(void *arg)
{
int m= (*(int *)arg)/2;
GCC_BUG_WORKAROUND int32 x;
for (x= ((int)(intptr)(&m)); m ; m--)
{
x= (x*m+0x87654321) & INT_MAX32;
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&bad, x);
my_atomic_rwlock_wrunlock(&rwl);
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&bad, -x);
my_atomic_rwlock_wrunlock(&rwl);
}
pthread_mutex_lock(&mutex);
if (!--running_threads) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
/*
1. generate thread number 0..N-1 from b32
2. add it to bad
3. swap thread numbers in c32
4. (optionally) one more swap to avoid 0 as a result
5. subtract result from bad
must get 0 in bad at the end
*/
pthread_handler_t test_atomic_fas(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(&bad, x);
my_atomic_rwlock_wrunlock(&rwl);
for (; m ; m--)
{
my_atomic_rwlock_wrlock(&rwl);
x= my_atomic_fas32(&c32, x);
my_atomic_rwlock_wrunlock(&rwl);
}
if (!x)
{
my_atomic_rwlock_wrlock(&rwl);
x= my_atomic_fas32(&c32, x);
my_atomic_rwlock_wrunlock(&rwl);
}
my_atomic_rwlock_wrlock(&rwl);
my_atomic_add32(&bad, -x);
my_atomic_rwlock_wrunlock(&rwl);
pthread_mutex_lock(&mutex);
if (!--running_threads) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
/*
same as test_atomic_add, but my_atomic_add32 is emulated with
my_atomic_cas32 - notice that the slowdown is proportional to the
number of CPUs
*/
pthread_handler_t test_atomic_cas(void *arg)
{
int m= (*(int *)arg)/2, ok= 0;
GCC_BUG_WORKAROUND int32 x, y;
for (x= ((int)(intptr)(&m)); m ; m--)
{
my_atomic_rwlock_wrlock(&rwl);
y= my_atomic_load32(&bad);
my_atomic_rwlock_wrunlock(&rwl);
x= (x*m+0x87654321) & INT_MAX32;
do {
my_atomic_rwlock_wrlock(&rwl);
ok= my_atomic_cas32(&bad, &y, (uint32)y+x);
my_atomic_rwlock_wrunlock(&rwl);
} while (!ok) ;
do {
my_atomic_rwlock_wrlock(&rwl);
ok= my_atomic_cas32(&bad, &y, y-x);
my_atomic_rwlock_wrunlock(&rwl);
} while (!ok) ;
}
pthread_mutex_lock(&mutex);
if (!--running_threads) pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return 0;
}
void do_tests()
{
plan(4);
bad= my_atomic_initialize();
ok(!bad, "my_atomic_initialize() returned %d", bad);
my_atomic_rwlock_init(&rwl);
b32= c32= 0;
test_concurrently("my_atomic_add32", test_atomic_add, THREADS, CYCLES);
b32= c32= 0;
test_concurrently("my_atomic_fas32", test_atomic_fas, THREADS, CYCLES);
b32= c32= 0;
test_concurrently("my_atomic_cas32", test_atomic_cas, THREADS, CYCLES);
my_atomic_rwlock_destroy(&rwl);
}
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