Declare __pthread_unwind. Define __do_cancel to use it. Declare old cleanup handler installation functions.

1 files changed, 98 insertions, 0 deletions

diff --git a/nptl/cleanup_defer_compat.c b/nptl/cleanup_defer_compat.c
new file mode 100644
index 0000000000..a0ed6da88c
--- /dev/null
+++ b/nptl/cleanup_defer_compat.c
@@ -0,0 +1,98 @@
+/* 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 "pthreadP.h"
+
+
+void
+_pthread_cleanup_push_defer (buffer, routine, arg)
+     struct _pthread_cleanup_buffer *buffer;
+     void (*routine) (void *);
+     void *arg;
+{
+  struct pthread *self = THREAD_SELF;
+
+  buffer->__routine = routine;
+  buffer->__arg = arg;
+  buffer->__prev = 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;
+      }
+
+  buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
+			  ? PTHREAD_CANCEL_ASYNCHRONOUS
+			  : PTHREAD_CANCEL_DEFERRED);
+
+  THREAD_SETMEM (self, cleanup, buffer);
+}
+strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer)
+
+
+void
+_pthread_cleanup_pop_restore (buffer, execute)
+     struct _pthread_cleanup_buffer *buffer;
+     int execute;
+{
+  struct pthread *self = THREAD_SELF;
+
+  THREAD_SETMEM (self, cleanup, buffer->__prev);
+
+  int cancelhandling;
+  if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
+      && ((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);
+    }
+
+  /* If necessary call the cleanup routine after we removed the
+     current cleanup block from the list.  */
+  if (execute)
+    buffer->__routine (buffer->__arg);
+}
+strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore)