From beafb7521f1ce231fa3ac799cdedd361b3469886 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Tue, 24 Jul 2001 04:22:05 +0000
Subject: Update.

	* libio/iofclose.c (_IO_new_fclose): Unlink descriptor first to
	avoid deadlock.
	* libio/oldiofclose.c (_IO_old_fclose): Likewise.
	* libio/genops.c (_IO_un_link): Get stream lock since it's not
	always done in the caller.
	(_IO_link_in): Likewise.
---
 libio/genops.c      | 54 ++++++++++++++++++++++++++++++++---------------------
 libio/iofclose.c    |  6 +++++-
 libio/oldiofclose.c |  6 +++++-
 3 files changed, 43 insertions(+), 23 deletions(-)

(limited to 'libio')

diff --git a/libio/genops.c b/libio/genops.c
index b878b63ef4..28bb0f980b 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -40,6 +40,17 @@ static _IO_lock_t list_all_lock = _IO_lock_initializer;
 /* Used to signal modifications to the list of FILE decriptors.  */
 static int _IO_list_all_stamp;
 
+
+static _IO_FILE *run_fp;
+
+static void
+flush_cleanup (void *not_used)
+{
+  if (run_fp != NULL)
+    _IO_funlockfile (run_fp);
+  _IO_lock_unlock (list_all_lock);
+}
+
 void
 _IO_un_link (fp)
      struct _IO_FILE_plus *fp;
@@ -48,7 +59,10 @@ _IO_un_link (fp)
     {
       struct _IO_FILE_plus **f;
 #ifdef _IO_MTSAFE_IO
+      _IO_cleanup_region_start_noarg (flush_cleanup);
       _IO_lock_lock (list_all_lock);
+      run_fp = (_IO_FILE *) fp;
+      _IO_flockfile ((_IO_FILE *) fp);
 #endif
       for (f = &_IO_list_all; *f; f = (struct _IO_FILE_plus **) &(*f)->file._chain)
 	{
@@ -59,10 +73,13 @@ _IO_un_link (fp)
 	      break;
 	    }
 	}
+      fp->file._flags &= ~_IO_LINKED;
 #ifdef _IO_MTSAFE_IO
+      _IO_funlockfile ((_IO_FILE *) fp);
+      run_fp = NULL;
       _IO_lock_unlock (list_all_lock);
+      _IO_cleanup_region_end (0);
 #endif
-      fp->file._flags &= ~_IO_LINKED;
     }
 }
 
@@ -70,19 +87,25 @@ void
 _IO_link_in (fp)
      struct _IO_FILE_plus *fp;
 {
-    if ((fp->file._flags & _IO_LINKED) == 0)
-      {
-	fp->file._flags |= _IO_LINKED;
+  if ((fp->file._flags & _IO_LINKED) == 0)
+    {
+      fp->file._flags |= _IO_LINKED;
 #ifdef _IO_MTSAFE_IO
-	_IO_lock_lock (list_all_lock);
+      _IO_cleanup_region_start_noarg (flush_cleanup);
+      _IO_lock_lock (list_all_lock);
+      run_fp = (_IO_FILE *) fp;
+      _IO_flockfile ((_IO_FILE *) fp);
 #endif
-	fp->file._chain = (_IO_FILE *) _IO_list_all;
-	_IO_list_all = fp;
-	++_IO_list_all_stamp;
+      fp->file._chain = (_IO_FILE *) _IO_list_all;
+      _IO_list_all = fp;
+      ++_IO_list_all_stamp;
 #ifdef _IO_MTSAFE_IO
-	_IO_lock_unlock (list_all_lock);
+      _IO_funlockfile ((_IO_FILE *) fp);
+      run_fp = NULL;
+      _IO_lock_unlock (list_all_lock);
+      _IO_cleanup_region_end (0);
 #endif
-      }
+    }
 }
 
 /* Return minimum _pos markers
@@ -756,17 +779,6 @@ _IO_get_column (fp)
 #endif
 
 
-static _IO_FILE *run_fp;
-
-static void
-flush_cleanup (void *not_used)
-{
-  if (run_fp != NULL)
-    _IO_funlockfile (run_fp);
-  _IO_lock_unlock (list_all_lock);
-}
-
-
 int
 _IO_flush_all ()
 {
diff --git a/libio/iofclose.c b/libio/iofclose.c
index bab0558d89..660c118359 100644
--- a/libio/iofclose.c
+++ b/libio/iofclose.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1997-1999, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1993,1995,1997-1999,2000,2001 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
@@ -53,6 +53,10 @@ _IO_new_fclose (fp)
     return _IO_old_fclose (fp);
 #endif
 
+  /* First unlink the stream.  */
+  if (fp->_IO_file_flags & _IO_IS_FILEBUF)
+    _IO_un_link ((struct _IO_FILE_plus *) fp);
+
   _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
   _IO_flockfile (fp);
   if (fp->_IO_file_flags & _IO_IS_FILEBUF)
diff --git a/libio/oldiofclose.c b/libio/oldiofclose.c
index 0c6066175b..c42e2f4eac 100644
--- a/libio/oldiofclose.c
+++ b/libio/oldiofclose.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1995,1997,1998,1999,2000 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1995, 1997-2000, 2001 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
@@ -48,6 +48,10 @@ _IO_old_fclose (fp)
   if (fp->_vtable_offset == 0)
     return _IO_new_fclose (fp);
 
+  /* First unlink the stream.  */
+  if (fp->_IO_file_flags & _IO_IS_FILEBUF)
+    _IO_un_link ((struct _IO_FILE_plus *) fp);
+
   _IO_cleanup_region_start ((void (*) (void *)) _IO_funlockfile, fp);
   _IO_flockfile (fp);
   if (fp->_IO_file_flags & _IO_IS_FILEBUF)
-- 
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