htl: Avoid exposing unixoid functions

C11 threads should not expose them.

htl/pt-create.c

@@ -178,7 +178,7 @@ __pthread_create_internal (struct __pthread **thread,
      shall be empty."  If the currnet thread is not a pthread then we
      just inherit the process' sigmask.  */
   if (__pthread_num_threads == 1)
-    err = sigprocmask (0, 0, &sigset);
+    err = __sigprocmask (0, 0, &sigset);
   else
     err = __pthread_sigstate (_pthread_self (), 0, 0, &sigset, 0);
   assert_perror (err);

htl/pt-yield.c

@@ -22,5 +22,5 @@
 int
 pthread_yield (void)
 {
-  return sched_yield ();
+  return __sched_yield ();
 }

sysdeps/htl/pt-destroy-specific.c

@@ -68,7 +68,7 @@ __pthread_destroy_specific (struct __pthread *thread)
 
       /* This may take a very long time.  Let those blocking on
          pthread_key_create or pthread_key_delete make progress.  */
-      sched_yield ();
+      __sched_yield ();
     }
 
   free (thread->thread_specifics);

sysdeps/mach/htl/pt-timedblock.c

@@ -39,7 +39,7 @@ __pthread_timedblock (struct __pthread *thread,
   /* We have an absolute time and now we have to convert it to a
      relative time.  Arg.  */
 
-  err = clock_gettime (clock_id, &now);
+  err = __clock_gettime (clock_id, &now);
   assert (!err);
 
   if (now.tv_sec > abstime->tv_sec

sysdeps/mach/hurd/Versions

@@ -14,6 +14,9 @@ libc {
 
     _dl_init_first;
     __close_nocancel_nostatus;
+
+    # functions used in other libraries
+    __sigprocmask;
   }
 }