[BZ #5208]

2007-10-23  Andreas Jaeger  <aj@suse.de>
	[BZ #5208]
	* sysdeps/unix/sysv/linux/readahead.c (__readahead): Use
	__LONG_LONG_PAIR to handle little endian byte order.
	Suggested by abhishekrai@google.com

3 files changed, 27 insertions, 1 deletions

diff --git a/nptl/sysdeps/unix/sysv/linux/fork.h b/nptl/sysdeps/unix/sysv/linux/fork.h
index 032b68f083..a00cfabe26 100644
--- a/nptl/sysdeps/unix/sysv/linux/fork.h
+++ b/nptl/sysdeps/unix/sysv/linux/fork.h
@@ -55,3 +55,6 @@ extern int __register_atfork (void (*__prepare) (void),
 			      void (*__child) (void),
 			      void *dso_handle);
 libc_hidden_proto (__register_atfork)
+
+/* Add a new element to the fork list.  */
+extern void __linkin_atfork (struct fork_handler *newp) attribute_hidden;
diff --git a/nptl/sysdeps/unix/sysv/linux/register-atfork.c b/nptl/sysdeps/unix/sysv/linux/register-atfork.c
index 231fc9b091..71abd0fb96 100644
--- a/nptl/sysdeps/unix/sysv/linux/register-atfork.c
+++ b/nptl/sysdeps/unix/sysv/linux/register-atfork.c
@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <fork.h>
+#include <atomic.h>
 
 
 /* Lock to protect allocation and deallocation of fork handlers.  */
@@ -109,6 +110,17 @@ __register_atfork (prepare, parent, child, dso_handle)
 libc_hidden_def (__register_atfork)
 
 
+void
+attribute_hidden
+__linkin_atfork (struct fork_handler *newp)
+{
+  do
+    newp->next = __fork_handlers;
+  while (catomic_compare_and_exchange_bool_acq (&__fork_handlers,
+						newp, newp->next) != 0);
+}
+
+
 libc_freeres_fn (free_mem)
 {
   /* Get the lock to not conflict with running forks.  */
diff --git a/nptl/sysdeps/unix/sysv/linux/unregister-atfork.c b/nptl/sysdeps/unix/sysv/linux/unregister-atfork.c
index 56a4f149e1..c738acd0c3 100644
--- a/nptl/sysdeps/unix/sysv/linux/unregister-atfork.c
+++ b/nptl/sysdeps/unix/sysv/linux/unregister-atfork.c
@@ -67,10 +67,21 @@ __unregister_atfork (dso_handle)
      It's a single linked list so readers are.  */
   do
     {
+    again:
       if (runp->dso_handle == dso_handle)
 	{
 	  if (lastp == NULL)
-	    __fork_handlers = runp->next;
+	    {
+	      /* We have to use an atomic operation here because
+		 __linkin_atfork also uses one.  */
+	      if (catomic_compare_and_exchange_bool_acq (&__fork_handlers,
+							 runp->next, runp)
+		  != 0)
+		{
+		  runp = __fork_handlers;
+		  goto again;
+		}
+	    }
 	  else
 	    lastp->next = runp->next;