htl: Make __pthread_sigmask directly call __sigthreadmask

If no thread was created yet, __pthread_sigstate will not find our ss
because self->kernel_thread is still nul, and then change the global
sigstate instead of our sigstate! We can directly call __sigthreadmask and
skip the (bogus) lookup step.

htl/pt-sigmask.c

@@ -19,15 +19,14 @@
 #include <pthread.h>
 #include <signal.h>
 #include <shlib-compat.h>
+#include <hurd/signal.h>
 #include <pt-internal.h>
 
 int
 __pthread_sigmask (int how, const sigset_t *set, sigset_t *oset)
 {
-  struct __pthread *self = _pthread_self ();
-
   /* Do not clear SELF's pending signals.  */
-  return __pthread_sigstate (self, how, set, oset, 0);
+  return __sigthreadmask (_hurd_self_sigstate (), how, set, oset, 0);
 }
 libc_hidden_def (__pthread_sigmask)
 versioned_symbol (libc, __pthread_sigmask, pthread_sigmask, GLIBC_2_41);

sysdeps/mach/hurd/sigthreadmask.c

@@ -36,6 +36,8 @@ __sigthreadmask (struct hurd_sigstate *ss, int how,
     new = *set;
 
   assert (ss);
+  /* We are not supposed to change the global blocked state */
+  assert (ss != _hurd_global_sigstate);
 
   _hurd_sigstate_lock (ss);