void main()
{
TRISB=0x00;
unsigned int i;
while (1)
{
PORTB=0x00;
for(i=0;i<=1000;i++)
timer_func();
PORTB=0xff;
for(i=0;i<=1000;i++)
timer_func();
}
}
/* Timer thread.
* This dedicated thread waits for posts on the timer semaphore.
* For each post, timer_func() is called once.
*
* This ensures that the timer_func() is not called in a signal context.
*/
static void *
timerthread(void *_)
{
while (!timer_stopped) {
int rc = sem_wait(&timer_sem); // retry on EINTR
if (rc == -1 && errno == EINTR)
continue;
if (rc == -1) {
perror("sem_wait");
exit(-1);
}
timer_func(); // user-specific timerfunc, can do anything it wants
}
return 0;
}
/* Timer thread.
* This dedicated thread waits for posts on the timer semaphore.
* For each post, timer_func() is called once.
*
* This ensures that the timer_func() is not called in a signal context.
*/
static void *
timerthread(void *_)
{
while (!timer_stopped) {
int rc = sem_wait(&timer_sem); /* same as P(sem) */
if (rc == -1 && errno == EINTR) /* call failed due to interrupt, retry */
continue;
if (rc == -1) { /* called due to something else */
printf("timerthread failed on sem_wait\n");
exit(-1);
}
timer_func(); /* user-specific timerfunc, can do anything it wants */
}
return 0;
}
/* Timer thread.
* This dedicated thread waits for posts on the timer semaphore.
* For each post, timer_func() is called once.
*
* This ensures that the timer_func() is not called in a signal context.
*/
static void *
timerthread(void *_)
{
struct timespec start;
struct timespec end;
unsigned long long int differ[100];
unsigned long long int sum=0;
long long int sd=0;
int i=0;
while (!timer_stopped) {
clock_gettime(CLOCK_REALTIME,&start);
int rc = sem_wait(&timer_sem); /* same as P(sem) */
if (rc == -1 && errno == EINTR) /* call failed due to interrupt, retry */
continue;
if (rc == -1) { /* called due to something else */
printf("timerthread failed on sem_wait\n");
exit(-1);
}
//clock_gettime(CLOCK_REALTIME,&start);
timer_func(); /* user-specific timerfunc, can do anything it wants */
clock_gettime(CLOCK_REALTIME,&end);
differ[i]=diff(start,end);
printf("%lld\n",differ[i]);
i++;
}
//calculate the average timeout duration
for (i=0;i<100; i++)
{
sum+=differ[i];
}
printf("average time out %lld\n",sum/100);
//calculate the standard deviation of the time out duration
for (i=0;i<100;i++)
{
sd+=(differ[i]-sum/100)*(differ[i]-sum/100);
}
long long int result=0;
result= sqrt(sd);
printf("stand divireation %lld\n",result);
return 0;
}
static void
clkintr(struct clockframe frame)
{
if (timecounter->tc_get_timecount == i8254_get_timecount) {
mtx_lock_spin(&clock_lock);
if (i8254_ticked)
i8254_ticked = 0;
else {
i8254_offset += timer0_max_count;
i8254_lastcount = 0;
}
clkintr_pending = 0;
mtx_unlock_spin(&clock_lock);
}
timer_func(&frame);
#ifdef SMP
if (timer_func == hardclock)
forward_hardclock();
#endif
switch (timer0_state) {
case RELEASED:
break;
case ACQUIRED:
if ((timer0_prescaler_count += timer0_max_count)
>= hardclock_max_count) {
timer0_prescaler_count -= hardclock_max_count;
hardclock(&frame);
#ifdef SMP
forward_hardclock();
#endif
}
break;
case ACQUIRE_PENDING:
mtx_lock_spin(&clock_lock);
i8254_offset = i8254_get_timecount(NULL);
i8254_lastcount = 0;
timer0_max_count = TIMER_DIV(new_rate);
outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
outb(TIMER_CNTR0, timer0_max_count & 0xff);
outb(TIMER_CNTR0, timer0_max_count >> 8);
mtx_unlock_spin(&clock_lock);
timer_func = new_function;
timer0_state = ACQUIRED;
break;
case RELEASE_PENDING:
if ((timer0_prescaler_count += timer0_max_count)
>= hardclock_max_count) {
mtx_lock_spin(&clock_lock);
i8254_offset = i8254_get_timecount(NULL);
i8254_lastcount = 0;
timer0_max_count = hardclock_max_count;
outb(TIMER_MODE,
TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
outb(TIMER_CNTR0, timer0_max_count & 0xff);
outb(TIMER_CNTR0, timer0_max_count >> 8);
mtx_unlock_spin(&clock_lock);
timer0_prescaler_count = 0;
timer_func = hardclock;
timer0_state = RELEASED;
hardclock(&frame);
#ifdef SMP
forward_hardclock();
#endif
}
break;
}
int main(int argc, char **argv) {
pthread_t timer_thread_id,
sig_handler_id,
writer_id;
int status, c;
sigset_t set;
struct sigaction act;
char *mode = NULL;
void *(*writer_func)(void *arg);
void *(*sig_processor)(void *arg);
/* Start by masking the "interesting" signals,
* SIGINT: To abort
* SIGRTMIN: Time to issue another I/O (simulates incoming data to be logged)
* */
sigemptyset (&set);
sigaddset(&set, SIGINT );
sigaddset(&set, SIGRTMIN );
/* Because all threads inherit the signal mask from their creator, all threads
* in this process will have these 2 signals masked unless one explicitly
* unmasks it. */
status = pthread_sigmask( SIG_BLOCK, &set, NULL );
/* parse arguments */
while ( (c = getopt(argc, argv, "f:(logfile)i:(iops)m:(mode)d(debug)")) != EOF ) {
switch (c) {
case 'f': /* log'f'ile name */
filename = strdup(optarg);
printf("Logging to file: %s\n",optarg);
break;
case 'i': /* 'i'ops to generate */
iops = atoi(optarg);
printf("Generating %s IOPS\n",optarg);
break;
case 'm': /* 'm'ode to run in, tiny or sane */
mode = strdup(optarg);
printf("Attempting to run in %s mode\n",optarg);
break;
case 'd': /* For debugging of signal generation/sigwait */
sig_processor = &sig_counter;
printf("DEBUG on\n");
break;
default:
break;
}
}
/* default IOPS to 50 */
if (iops == 0)
iops = 50;
/* fail if filename not set */
if (! filename) {
perror("Must provide filename to log to");
exit(1);
}
if (! mode) {
/* default to tiny mode */
mode = "tiny";
writer_func = &tiny_writer;
} else {
if ( strcmp(mode, "tiny") == 0 ) {
writer_func = &tiny_writer;
} else if ( strcmp(mode, "sane") == 0 ) {
writer_func = &sane_writer;
} else {
printf("ERROR: unknown mode %s\n",mode);
exit(1);
}
}
report_resolution();
/* Create the sigwait/sigwaitinfo thread */
status = pthread_create( &sig_handler_id, NULL, sig_processor, NULL);
if (status != 0) {
perror("Startup of signal processor thread");
exit(1);
}
/* Create the writer thread */
status = pthread_create( &writer_id, NULL, writer_func, NULL);
if (status != 0) {
perror("Startup of writer thread");
exit(1);
}
/* Start up the timer */
timer_func(iops);
printf("Hit Ctrl-C to stop...\n");
/* Wait for the sigwait thread to receive SIGINT and signal the condition
* variable */
status = pthread_mutex_lock( &intr_mutex );
if (status != 0) {
perror("main thread intr_mutex lock");
exit(1);
}
while (!interrupted) {
status = pthread_cond_wait( &intr_cond, &intr_mutex );
if (status != 0) {
perror("main thread intr_cond wait");
exit(1);
}
}
status = pthread_mutex_unlock( &intr_mutex );
if (status != 0) {
perror("main thread unlock intr_mutex");
exit(1);
}
printf("Terminating\n");
exit(0);
}
