1 files changed, 101 insertions, 0 deletions
diff --git a/REORG.TODO/nptl/cancellation.c b/REORG.TODO/nptl/cancellation.c
new file mode 100644
index 0000000000..e3f0b619d6
--- /dev/null
+++ b/REORG.TODO/nptl/cancellation.c
@@ -0,0 +1,101 @@
+/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   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 <setjmp.h>
+#include <stdlib.h>
+#include "pthreadP.h"
+#include <futex-internal.h>
+
+
+/* The next two functions are similar to pthread_setcanceltype() but
+   more specialized for the use in the cancelable functions like write().
+   They do not need to check parameters etc.  */
+int
+attribute_hidden
+__pthread_enable_asynccancel (void)
+{
+  struct pthread *self = THREAD_SELF;
+  int oldval = THREAD_GETMEM (self, cancelhandling);
+
+  while (1)
+    {
+      int newval = oldval | CANCELTYPE_BITMASK;
+
+      if (newval == oldval)
+	break;
+
+      int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
+					      oldval);
+      if (__glibc_likely (curval == oldval))
+	{
+	  if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval))
+	    {
+	      THREAD_SETMEM (self, result, PTHREAD_CANCELED);
+	      __do_cancel ();
+	    }
+
+	  break;
+	}
+
+      /* Prepare the next round.  */
+      oldval = curval;
+    }
+
+  return oldval;
+}
+
+
+void
+internal_function attribute_hidden
+__pthread_disable_asynccancel (int oldtype)
+{
+  /* If asynchronous cancellation was enabled before we do not have
+     anything to do.  */
+  if (oldtype & CANCELTYPE_BITMASK)
+    return;
+
+  struct pthread *self = THREAD_SELF;
+  int newval;
+
+  int oldval = THREAD_GETMEM (self, cancelhandling);
+
+  while (1)
+    {
+      newval = oldval & ~CANCELTYPE_BITMASK;
+
+      int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
+					      oldval);
+      if (__glibc_likely (curval == oldval))
+	break;
+
+      /* Prepare the next round.  */
+      oldval = curval;
+    }
+
+  /* We cannot return when we are being canceled.  Upon return the
+     thread might be things which would have to be undone.  The
+     following loop should loop until the cancellation signal is
+     delivered.  */
+  while (__builtin_expect ((newval & (CANCELING_BITMASK | CANCELED_BITMASK))
+			   == CANCELING_BITMASK, 0))
+    {
+      futex_wait_simple ((unsigned int *) &self->cancelhandling, newval,
+			 FUTEX_PRIVATE);
+      newval = THREAD_GETMEM (self, cancelhandling);
+    }
+}