* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#define _GNU_SOURCE
#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/syscall.h>
+#include <sched.h>
#include "arch.h"
pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
-static volatile int test_go;
+static volatile int test_go, test_stop;
static int wdelay;
-static struct test_array test_array = { 8 };
+static volatile struct test_array test_array = { 8 };
static unsigned long duration;
-static time_t start_time;
-static unsigned long __thread duration_interval;
-#define DURATION_TEST_DELAY_WRITE 4
-#define DURATION_TEST_DELAY_READ 100
+
+/* read-side C.S. duration, in us */
+static unsigned long rduration;
/*
* returns 0 if test should end.
*/
static int test_duration_write(void)
{
- if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) {
- duration_interval = 0;
- if (time(NULL) - start_time >= duration)
- return 0;
- }
- return 1;
+ return !test_stop;
}
static int test_duration_read(void)
{
- if (duration_interval++ >= DURATION_TEST_DELAY_READ) {
- duration_interval = 0;
- if (time(NULL) - start_time >= duration)
- return 0;
- }
- return 1;
+ return !test_stop;
}
static unsigned long long __thread nr_writes;
for (;;) {
pthread_rwlock_rdlock(&lock);
assert(test_array.a == 8);
+ if (unlikely(rduration))
+ usleep(rduration);
pthread_rwlock_unlock(&lock);
nr_reads++;
- if (!test_duration_read())
+ if (unlikely(!test_duration_read()))
break;
}
for (;;) {
pthread_rwlock_wrlock(&lock);
+ test_array.a = 0;
test_array.a = 8;
pthread_rwlock_unlock(&lock);
nr_writes++;
- if (!test_duration_write())
+ if (unlikely(!test_duration_write()))
break;
- if (wdelay)
+ if (unlikely(wdelay))
usleep(wdelay);
}
printf(" [-r] [-w] (yield reader and/or writer)");
#endif
printf(" [-d delay] (writer period (us))");
+ printf(" [-c duration] (reader C.S. duration (us))");
+ printf(" [-a cpu#] [-a cpu#]... (affinity)");
printf("\n");
}
+cpu_set_t affinity;
+
int main(int argc, char **argv)
{
int err;
void *tret;
unsigned long long *count_reader, *count_writer;
unsigned long long tot_reads = 0, tot_writes = 0;
- int i;
+ int i, a;
+ int use_affinity = 0;
if (argc < 4) {
show_usage(argc, argv);
return -1;
}
+ CPU_ZERO(&affinity);
+
for (i = 4; i < argc; i++) {
if (argv[i][0] != '-')
continue;
yield_active |= YIELD_WRITE;
break;
#endif
+ case 'a':
+ if (argc < i + 2) {
+ show_usage(argc, argv);
+ return -1;
+ }
+ a = atoi(argv[++i]);
+ CPU_SET(a, &affinity);
+ use_affinity = 1;
+ printf("Adding CPU %d affinity\n", a);
+ break;
+ case 'c':
+ if (argc < i + 2) {
+ show_usage(argc, argv);
+ return -1;
+ }
+ rduration = atoi(argv[++i]);
+ break;
case 'd':
if (argc < i + 2) {
show_usage(argc, argv);
printf("Writer delay : %u us.\n", wdelay);
printf("thread %-6s, thread id : %lx, tid %lu\n",
"main", pthread_self(), (unsigned long)gettid());
+ if (use_affinity
+ && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
+ perror("sched_setaffinity");
+ exit(-1);
+ }
tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
exit(1);
}
- start_time = time(NULL);
- test_go = 1;
smp_mb();
+ test_go = 1;
+
+ sleep(duration);
+
+ test_stop = 1;
+
for (i = 0; i < nr_readers; i++) {
err = pthread_join(tid_reader[i], &tret);
if (err != 0)