1 files changed, 100 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/thread-cancel.c b/REORG.TODO/hurd/thread-cancel.c
new file mode 100644
index 0000000000..722b6adc74
--- /dev/null
+++ b/REORG.TODO/hurd/thread-cancel.c
@@ -0,0 +1,100 @@
+/* Thread cancellation support.
+   Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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 the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <hurd/signal.h>
+#include <hurd/interrupt.h>
+#include <assert.h>
+#include <thread_state.h>
+
+
+/* See hurdsig.c.  */
+extern mach_port_t _hurdsig_abort_rpcs (struct hurd_sigstate *ss,
+					int signo, int sigthread,
+					struct machine_thread_all_state *,
+					int *state_change,
+					mach_port_t *reply_port,
+					mach_msg_type_name_t reply_port_type,
+					int untraced);
+
+error_t
+hurd_thread_cancel (thread_t thread)
+{
+  struct hurd_sigstate *ss = _hurd_thread_sigstate (thread);
+  struct machine_thread_all_state state;
+  int state_change;
+  error_t err;
+
+  if (! ss)
+    return EINVAL;
+  if (ss == _hurd_self_sigstate ())
+    {
+      /* We are cancelling ourselves, so it is easy to succeed
+	 quickly.  Since this function is not a cancellation point, we
+	 just leave the flag set pending the next cancellation point
+	 (hurd_check_cancel or RPC) and return success.  */
+      ss->cancel = 1;
+      return 0;
+    }
+
+  assert (! __spin_lock_locked (&ss->critical_section_lock));
+  __spin_lock (&ss->critical_section_lock);
+  __spin_lock (&ss->lock);
+  err = __thread_suspend (thread);
+  __spin_unlock (&ss->lock);
+
+  if (! err)
+    {
+      /* Set the flag telling the thread its operation is being cancelled.  */
+      ss->cancel = 1;
+
+      /* Interrupt any interruptible RPC now in progress.  */
+      state.set = 0;
+      _hurdsig_abort_rpcs (ss, 0, 0, &state, &state_change, NULL, 0, 0);
+      if (state_change)
+	err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
+				  (natural_t *) &state.basic,
+				  MACHINE_THREAD_STATE_COUNT);
+
+      if (ss->cancel_hook)
+	/* The code being cancelled has a special wakeup function.
+	   Calling this should make the thread wake up and check the
+	   cancellation flag.  */
+	(*ss->cancel_hook) ();
+
+      __thread_resume (thread);
+    }
+
+  _hurd_critical_section_unlock (ss);
+  return err;
+}
+
+
+int
+hurd_check_cancel (void)
+{
+  struct hurd_sigstate *ss = _hurd_self_sigstate ();
+  int cancel;
+
+  __spin_lock (&ss->lock);
+  assert (! __spin_lock_locked (&ss->critical_section_lock));
+  cancel = ss->cancel;
+  ss->cancel = 0;
+  __spin_unlock (&ss->lock);
+
+  return cancel;
+}