void *rgb (void *arg)
{
arg_s *a = arg;
u64 start, finish;
unint i;
rgb_lock(a->name, &Red);
start = nsecs();
for (i = Loops; i; i--) {
#if (!DEBUG && !MUTEX && !SPIN && !TSPIN)
donothing();
#endif
rgb_lock(a->name, &Green);
rgb_unlock(a->name, &Red);
rgb_lock(a->name, &Blue);
rgb_unlock(a->name, &Green);
rgb_lock(a->name, &Red);
rgb_unlock(a->name, &Blue);
}
rgb_unlock(a->name, &Red);
finish = nsecs();
printf("%s %g nsecs per lock-unlock pair\n", a->name,
((double)(finish - start))/(3 * Loops));
return NULL;
}
void *rgb (void *arg)
{
arg_s *a = arg;
u64 start, finish;
unint red = a->id;
unint green = a->id + 1;
unint i;
rgb_lock(a->name, &Lock[red]);
dec_count();
rgb_lock("start", &StartLock);
rgb_unlock("start", &StartLock);
start = nsecs();
for (i = Loops; i; i--) {
#if (!DEBUG && !MUTEX && !SPIN && !TSPIN)
donothing();
#endif
rgb_lock(a->name, &Lock[green]);
rgb_unlock(a->name, &Lock[red]);
if (++red == Num_locks) red = 0;
if (++green == Num_locks) green = 0;
}
rgb_unlock(a->name, &Lock[red]);
finish = nsecs();
printf("%s %g nsecs per lock-unlock pair\n", a->name,
((double)(finish - start))/Loops);
return NULL;
}
void start_threads (unsigned threads)
{
pthread_t *thread;
unsigned i;
int rc;
arg_s *arg;
arg_s *a;
rgb_lock("main", &Red);
thread = ezalloc(threads * sizeof(pthread_t));
arg = ezalloc(threads * sizeof(arg_s));
for (i = 0, a = arg; i < threads; i++, a++) {
sprintf(a->name, "rgb%d", i);
rc = pthread_create( &thread[i], NULL, rgb, a);
if (rc) {
eprintf("pthread_create %d\n", rc);
break;
}
}
sleep(1);
rgb_unlock("main", &Red);
while (i--) {
pthread_join(thread[i], NULL);
}
}
void start_threads (unsigned threads)
{
pthread_t *thread;
unsigned i;
int rc;
arg_s *arg;
arg_s *a;
Count = threads;
rgb_lock("start", &StartLock);
thread = ezalloc(threads * sizeof(pthread_t));
arg = ezalloc(threads * sizeof(arg_s));
for (i = 0, a = arg; i < threads; i++, a++) {
sprintf(a->name, "rgb%d", i);
a->id = i;
rc = pthread_create( &thread[i], NULL, rgb, a);
if (rc) {
eprintf("pthread_create %d\n", rc);
break;
}
}
for (i = 0; Count; i++) {
sleep(1);
}
rgb_unlock("start", &StartLock);
for (i = 0; i < threads; i++) {
pthread_join(thread[i], NULL);
}
}
static void dec_count(void)
{
rgb_lock("count", &CountLock);
--Count;
rgb_unlock("count", &CountLock);
}
