[hurd,commited] hurd: Fix implementation of setitimer.

[Samuel Thibault]

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.
---
 ChangeLog                     |  1 +
 sysdeps/mach/hurd/setitimer.c | 20 ++++++++++++--------
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 06c8852c95..c3cae2a11e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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  <address@hidden>
 
diff --git a/sysdeps/mach/hurd/setitimer.c b/sysdeps/mach/hurd/setitimer.c
index 61e37c5f5d..39aead883a 100644
--- a/sysdeps/mach/hurd/setitimer.c
+++ b/sysdeps/mach/hurd/setitimer.c
@@ -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.  */
 }
-- 
2.23.0.rc1