Updated to fedora-glibc-20060531T1322cvs/fedora-glibc-2_4_90-11

1 files changed, 34 insertions, 3 deletions

diff --git a/nscd/cache.c b/nscd/cache.c
index 787f8b46f5..be9be2aa4f 100644
--- a/nscd/cache.c
+++ b/nscd/cache.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 1998, 1999, 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Copyright (c) 1998, 1999, 2003-2005, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
@@ -190,13 +190,34 @@ cache_add (int type, const void *key, size_t len, struct datahead *packet,
    free the data structures since some hash table entries share the same
    data.  */
 void
-prune_cache (struct database_dyn *table, time_t now)
+prune_cache (struct database_dyn *table, time_t now, int fd)
 {
   size_t cnt = table->head->module;
 
   /* If this table is not actually used don't do anything.  */
   if (cnt == 0)
-    return;
+    {
+      if (fd != -1)
+	{
+	  /* Reply to the INVALIDATE initiator.  */
+	  int32_t resp = 0;
+	  writeall (fd, &resp, sizeof (resp));
+	}
+      return;
+    }
+
+  /* This function can be called from the cleanup thread but also in
+     response to an invalidate command.  Make sure only one thread is
+     running.  When not serving INVALIDATE request, no need for the
+     second to wait around.  */
+  if (fd == -1)
+    {
+      if (pthread_mutex_trylock (&table->prunelock) != 0)
+	/* The work is already being done.  */
+	return;
+    }
+  else
+    pthread_mutex_lock (&table->prunelock);
 
   /* If we check for the modification of the underlying file we invalidate
      the entries also in this case.  */
@@ -367,6 +388,14 @@ prune_cache (struct database_dyn *table, time_t now)
     }
   while (cnt > 0);
 
+  if (fd != -1)
+    {
+      /* Reply to the INVALIDATE initiator that the cache has been
+	 invalidated.  */
+      int32_t resp = 0;
+      writeall (fd, &resp, sizeof (resp));
+    }
+
   if (first <= last)
     {
       struct hashentry *head = NULL;
@@ -455,4 +484,6 @@ prune_cache (struct database_dyn *table, time_t now)
   /* Run garbage collection if any entry has been removed or replaced.  */
   if (any)
     gc (table);
+
+  pthread_mutex_unlock (&table->prunelock);
 }