2002-05-11 Marcus Brinkmann <marcus@gnu.org>

	* handle_io_release_conch.c (iohelp_handle_io_release_conch):
	New variable USER_SH.  Hold USER_SH->lock while checking conch
	status.

2 files changed, 11 insertions, 2 deletions

diff --git a/libiohelp/ChangeLog b/libiohelp/ChangeLog
index 34d8c817..8d34e7d8 100644
--- a/libiohelp/ChangeLog
+++ b/libiohelp/ChangeLog
@@ -1,3 +1,9 @@
+2002-05-11  Marcus Brinkmann  <marcus@gnu.org>
+
+	* handle_io_release_conch.c (iohelp_handle_io_release_conch):
+	New variable USER_SH.  Hold USER_SH->lock while checking conch
+	status.
+
 2002-05-07  Roland McGrath  <roland@frob.com>
 
 	* iouser-reauth.c (iohelp_reauth): u_int -> size_t
diff --git a/libiohelp/handle_io_release_conch.c b/libiohelp/handle_io_release_conch.c
index fa95a6e5..8a6bd32d 100644
--- a/libiohelp/handle_io_release_conch.c
+++ b/libiohelp/handle_io_release_conch.c
@@ -23,13 +23,16 @@
 void
 iohelp_handle_io_release_conch (struct conch *c, void *user)
 {
-  
+  struct shared_io *user_sh = c->holder_shared_page;
+
+  spin_lock (&user_sh->lock);
   if (c->holder_shared_page->conch_status != USER_HAS_NOT_CONCH)
     {
       c->holder_shared_page->conch_status = USER_HAS_NOT_CONCH;
       iohelp_fetch_shared_data (c->holder);
     }
-  
+  spin_unlock (&user_sh->lock);
+
   if (c->holder == user)
     {
       c->holder = 0;