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hurd: Fix implementation of setitimer.

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The preemptor sigcode doesn't match since the POSIX sigcode SI_TIMER is
used when SIGALRM is sent. In addition, The inline version of
hurd_preempt_signals doesn't update _hurdsig_preempted_set. For these
reasons, the preemptor would be skipped by post_signal.

    * sysdeps/mach/hurd/setitimer.c (setitimer_locked): Fix preemptor setup.
This commit is contained in:
Samuel Thibault 2019-08-30 01:04:17 +02:00
parent 4b068090a0
commit f0e84494b1
2 changed files with 13 additions and 8 deletions
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1
ChangeLog
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@ -2,6 +2,7 @@
* hurd/hurdselect.c (_hurd_select): Always call __io_select with no
timeout.
* sysdeps/mach/hurd/setitimer.c (setitimer_locked): Fix preemptor setup.
2019-08-29 Mihailo Stojanovic <mihailo.stojanovic@rt-rk.com>

20
sysdeps/mach/hurd/setitimer.c
View File

@ -128,7 +128,8 @@ timer_thread (void)
/* Forward declaration. */
static int setitimer_locked (const struct itimerval *new,
struct itimerval *old, void *crit);
struct itimerval *old, void *crit,
int hurd_siglocked);
static sighandler_t
restart_itimer (struct hurd_signal_preemptor *preemptor,
@ -142,7 +143,7 @@ restart_itimer (struct hurd_signal_preemptor *preemptor,
/* Either reload or disable the itimer. */
__spin_lock (&_hurd_itimer_lock);
it.it_value = it.it_interval = _hurd_itimerval.it_interval;
setitimer_locked (&it, NULL, NULL);
setitimer_locked (&it, NULL, NULL, 1);
/* Continue with normal delivery (or hold, etc.) of SIGALRM. */
return SIG_ERR;
@ -154,7 +155,7 @@ restart_itimer (struct hurd_signal_preemptor *preemptor,
static int
setitimer_locked (const struct itimerval *new, struct itimerval *old,
void *crit)
void *crit, int hurd_siglocked)
{
struct itimerval newval;
struct timeval now, remaining, elapsed;
@ -192,16 +193,19 @@ setitimer_locked (const struct itimerval *new, struct itimerval *old,
run `restart_itimer' each time a SIGALRM would arrive. */
static struct hurd_signal_preemptor preemptor =
{
__sigmask (SIGALRM), 0, 0,
__sigmask (SIGALRM), SI_TIMER, SI_TIMER,
&restart_itimer,
};
__mutex_lock (&_hurd_siglock);
if (!hurd_siglocked)
__mutex_lock (&_hurd_siglock);
if (! preemptor.next && _hurdsig_preemptors != &preemptor)
{
preemptor.next = _hurdsig_preemptors;
_hurdsig_preemptors = &preemptor;
_hurdsig_preempted_set |= preemptor.signals;
}
__mutex_unlock (&_hurd_siglock);
if (!hurd_siglocked)
__mutex_unlock (&_hurd_siglock);
if (_hurd_itimer_port == MACH_PORT_NULL)
{
@ -349,7 +353,7 @@ __setitimer (enum __itimer_which which, const struct itimerval *new,
crit = _hurd_critical_section_lock ();
__spin_lock (&_hurd_itimer_lock);
return setitimer_locked (new, old, crit);
return setitimer_locked (new, old, crit, 0);
}
static void
@ -364,7 +368,7 @@ fork_itimer (void)
it = _hurd_itimerval;
it.it_value = it.it_interval;
setitimer_locked (&it, NULL, NULL);
setitimer_locked (&it, NULL, NULL, 0);
(void) &fork_itimer; /* Avoid gcc optimizing out the function. */
}