static void
thr_suspender(void *arg)
{
struct thread *td = (struct thread *) arg;
int error;
for (;;) {
if (QUIT == 1)
break;
error = kthread_suspend(td, 10*hz);
if (error != 0 && QUIT == 0) {
if (error == EWOULDBLOCK)
panic("Ooops: kthread deadlock\n");
else
panic("kthread_suspend error: %d\n", error);
break;
}
}
mtx_lock(&test_global_lock);
test_thrcnt--;
wakeup(&global_condvar);
mtx_unlock(&test_global_lock);
kthread_exit();
}
/*!
* Suspend thread until given time elapses
* \param clockid Clock to use
* \param flags Flags (TIMER_ABSTIME)
* \param request Suspend duration
* \param remain Remainder time if interrupted during suspension
* \return status
*/
int sys__clock_nanosleep ( void *p )
{
clockid_t clockid;
int flags;
timespec_t *request;
timespec_t *remain;
int retval = EXIT_SUCCESS;
kthread_t *kthread = kthread_get_active ();
ktimer_t *ktimer;
sigevent_t evp;
itimerspec_t itimer;
clockid = *( (clockid_t *) p ); p += sizeof (clockid_t);
flags = *( (int *) p ); p += sizeof (int);
request = *( (timespec_t **) p ); p += sizeof (timespec_t *);
remain = *( (timespec_t **) p );
ASSERT_ERRNO_AND_EXIT (
(clockid==CLOCK_REALTIME || clockid==CLOCK_MONOTONIC) &&
request && TIME_IS_SET(request),
EINVAL
);
/* Timers are used for "sleep" operations through steps 1-4 */
/* 1. create timer, but not arm it yet */
evp.sigev_notify = SIGEV_WAKE_THREAD;
evp.sigev_value.sival_ptr = kthread;
evp.sigev_notify_function = kclock_wake_thread;
retval += ktimer_create ( clockid, &evp, &ktimer, kthread );
ASSERT ( retval == EXIT_SUCCESS );
/* save remainder location, if provided */
ktimer->param = remain;
/* 2. suspend thread */
kthread_set_private_param ( kthread, ktimer );
retval += kthread_suspend ( kthread, kclock_interrupt_sleep, ktimer );
ASSERT ( retval == EXIT_SUCCESS );
/* 3. arm timer */
TIME_RESET ( &itimer.it_interval );
itimer.it_value = *request;
retval += ktimer_settime ( ktimer, flags, &itimer, NULL );
ASSERT ( retval == EXIT_SUCCESS );
/* 4. pick other thread as active */
kthreads_schedule ();
EXIT ( retval );
}
/*!
* Wait for signal
* \param set Signals thread is waiting for
* \param info Where to save caught signal
* \return signal number if signal is caught,
* -1 otherwise and appropriate error number is set
*/
int sys__sigwaitinfo ( void *p )
{
sigset_t *set;
siginfo_t *info;
kthread_t *kthread;
ksignal_handling_t *sh;
ksiginfo_t *ksig, *next;
int retval;
set = *( (sigset_t **) p ); p += sizeof (sigset_t *);
info = *( (siginfo_t **) p );
ASSERT_ERRNO_AND_EXIT ( set, EINVAL );
set = U2K_GET_ADR ( set, kthread_get_process (NULL) );
ASSERT_ERRNO_AND_EXIT ( set, EINVAL );
if ( info )
info = U2K_GET_ADR ( info, kthread_get_process (NULL) );
kthread = kthread_get_active ();
sh = kthread_get_sigparams ( kthread );
/* first, search for such signal in pending signals */
ksig = list_get ( &sh->pending_signals, FIRST );
while ( ksig )
{
next = list_get_next ( &ksig->list );
if ( sigtestset ( set, ksig->siginfo.si_signo ) )
{
retval = ksig->siginfo.si_signo;
if ( info )
*info = ksig->siginfo;
list_remove ( &sh->pending_signals, 0, &ksig->list );
kfree ( ksig );
EXIT2 ( EXIT_SUCCESS, retval );
}
ksig = next;
}
/*
* if no pending signal found that matches given mask
* suspend thread until signal is received
*/
kthread_suspend ( kthread, ksignal_received_signal, NULL );
kthreads_schedule ();
EXIT ( EINTR ); /* if other events wake thread */
}
void
kthread_shutdown(void *arg, int howto)
{
struct thread *td;
int error;
if (panicstr)
return;
td = (struct thread *)arg;
printf("Waiting (max %d seconds) for system thread `%s' to stop... ",
kproc_shutdown_wait, td->td_name);
error = kthread_suspend(td, kproc_shutdown_wait * hz);
if (error == EWOULDBLOCK)
printf("timed out\n");
else
printf("done\n");
}