1 files changed, 91 insertions, 0 deletions
diff --git a/libpthread/signal/sigwaiter.c b/libpthread/signal/sigwaiter.c
new file mode 100644
index 00000000..8d041ac1
--- /dev/null
+++ b/libpthread/signal/sigwaiter.c
@@ -0,0 +1,91 @@
+/* sigwaiter.c - Signal handling functions.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   Written by Neal H. Walfield <neal@gnu.org>.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License
+   as published by the Free Software Foundation; either version 3 of
+   the License, or (at your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this program.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "sig-internal.h"
+
+#include <hurd/futex.h>
+
+struct sigwaiter *sigwaiters;
+
+siginfo_t
+sigwaiter_block (struct signal_state *ss, const sigset_t *restrict set)
+{
+  assert (pthread_mutex_trylock (&sig_lock) == EBUSY);
+  assert (pthread_mutex_trylock (&ss->lock) == EBUSY);
+
+  assert (! ss->sigwaiter);
+
+  struct sigwaiter waiter;
+
+  waiter.next = sigwaiters;
+  if (waiter.next)
+    {
+      assert (! waiter.next->prev);
+      waiter.next->prev = &waiter;
+    }
+  waiter.prev = 0;
+  sigwaiters = &waiter;
+
+  waiter.ss = ss;
+  waiter.info.si_signo = 0;
+  waiter.signals = *set;
+
+  ss->sigwaiter = &waiter;
+
+  pthread_mutex_unlock (&ss->lock);
+  pthread_mutex_unlock (&sig_lock);
+
+  futex_wait (&waiter.info.si_signo, 0);
+
+#ifndef NDEBUG
+  pthread_mutex_lock (&ss->lock);
+  ss->sigwaiter = 0;
+  pthread_mutex_unlock (&ss->lock);
+#endif
+
+  assert (waiter.info.si_signo);
+  return waiter.info;
+}
+
+void
+sigwaiter_unblock (struct sigwaiter *waiter)
+{
+  assert (pthread_mutex_trylock (&sig_lock) == EBUSY);
+  assert (pthread_mutex_trylock (&waiter->ss->lock) == EBUSY);
+
+  struct sigwaiter *prev = waiter->prev;
+  struct sigwaiter *next = waiter->next;
+
+  if (next)
+    next->prev = prev;
+
+  if (prev)
+    prev->next = next;
+  else
+    sigwaiters = next;
+
+  sigdelset (&process_pending, waiter->info.si_signo);
+  sigdelset (&waiter->ss->pending, waiter->info.si_signo);
+
+  pthread_mutex_unlock (&waiter->ss->lock);
+  pthread_mutex_unlock (&sig_lock);
+
+  futex_wake (&waiter->info.si_signo, 1);
+}