From 0b3366f6a93ac0f7e2028745ea557c0acd8722c6 Mon Sep 17 00:00:00 2001
From: "\"Steven J. Hill\"" <sjhill@realitydiluted.com>
Date: Sat, 7 May 2005 02:04:55 +0000
Subject: Import in NPTL code from glibc. For further information please
 consult the 'README.NPTL' file.

---
 libpthread/nptl/cleanup_defer.c | 92 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 libpthread/nptl/cleanup_defer.c

(limited to 'libpthread/nptl/cleanup_defer.c')

diff --git a/libpthread/nptl/cleanup_defer.c b/libpthread/nptl/cleanup_defer.c
new file mode 100644
index 000000000..498d9557d
--- /dev/null
+++ b/libpthread/nptl/cleanup_defer.c
@@ -0,0 +1,92 @@
+/* Copyright (C) 2002, 2003 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdlib.h>
+#include "pthreadP.h"
+
+
+void
+__cleanup_fct_attribute
+__pthread_register_cancel_defer (__pthread_unwind_buf_t *buf)
+{
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+  struct pthread *self = THREAD_SELF;
+
+  /* Store old info.  */
+  ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
+  ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup);
+
+  int cancelhandling = THREAD_GETMEM (self, cancelhandling);
+
+  /* Disable asynchronous cancellation for now.  */
+  if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0))
+    while (1)
+      {
+	int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
+						cancelhandling
+						& ~CANCELTYPE_BITMASK,
+						cancelhandling);
+	if (__builtin_expect (curval == cancelhandling, 1))
+	  /* Successfully replaced the value.  */
+	  break;
+
+	/* Prepare for the next round.  */
+	cancelhandling = curval;
+      }
+
+  ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK
+				? PTHREAD_CANCEL_ASYNCHRONOUS
+				: PTHREAD_CANCEL_DEFERRED);
+
+  /* Store the new cleanup handler info.  */
+  THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf);
+}
+
+
+void
+__cleanup_fct_attribute
+__pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf)
+{
+  struct pthread *self = THREAD_SELF;
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+
+  THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev);
+
+  int cancelhandling;
+  if (ibuf->priv.data.canceltype != PTHREAD_CANCEL_DEFERRED
+      && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
+	  & CANCELTYPE_BITMASK) == 0)
+    {
+      while (1)
+	{
+	  int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
+						  cancelhandling
+						  | CANCELTYPE_BITMASK,
+						  cancelhandling);
+	  if (__builtin_expect (curval == cancelhandling, 1))
+	    /* Successfully replaced the value.  */
+	    break;
+
+	  /* Prepare for the next round.  */
+	  cancelhandling = curval;
+	}
+
+      CANCELLATION_P (self);
+    }
+}
-- 
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