From e0faf22f31c48fb27b43c1825897d26e58feafc4 Mon Sep 17 00:00:00 2001
From: root <root@(null).(none)>
Date: Sun, 3 May 2009 17:20:00 +0200
Subject: This is my initial working version. There is a bug in boot in this
 version: subhurd sometimes cannot boot.

---
 pfinet.old/kmem_cache.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 pfinet.old/kmem_cache.c

(limited to 'pfinet.old/kmem_cache.c')

diff --git a/pfinet.old/kmem_cache.c b/pfinet.old/kmem_cache.c
new file mode 100644
index 00000000..8c73c9bf
--- /dev/null
+++ b/pfinet.old/kmem_cache.c
@@ -0,0 +1,88 @@
+/* Hack replacement for Linux's kmem_cache_t allocator
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+/* Hack replacement for Linux's kmem_cache_t allocator, using plain malloc
+   and cthreads locking.  The locking here is probably unnecessary.  */
+
+#include <cthreads.h>
+#include <linux/malloc.h>
+
+struct kmem_cache_s
+{
+  struct mutex lock;
+
+  void *freelist;
+  size_t item_size;
+
+  void (*ctor) (void *, kmem_cache_t *, unsigned long);
+  void (*dtor) (void *, kmem_cache_t *, unsigned long);
+};
+
+kmem_cache_t *
+kmem_cache_create (const char *name, size_t item_size,
+		   size_t something, unsigned long flags,
+		   void (*ctor) (void *, kmem_cache_t *, unsigned long),
+		   void (*dtor) (void *, kmem_cache_t *, unsigned long))
+{
+  kmem_cache_t *new = malloc (sizeof *new);
+  if (!new)
+    return 0;
+  mutex_init (&new->lock);
+  new->freelist = 0;
+  new->item_size = item_size;
+  new->ctor = ctor;
+  new->dtor = dtor;
+
+  return new;
+}
+
+
+void *
+kmem_cache_alloc (kmem_cache_t *cache, int flags)
+{
+  void *p;
+
+  __mutex_lock (&cache->lock);
+  p = cache->freelist;
+  if (p != 0) {
+    cache->freelist = *(void **)(p + cache->item_size);
+    __mutex_unlock (&cache->lock);
+    return p;
+  }
+  __mutex_unlock (&cache->lock);
+
+  p = malloc (cache->item_size + sizeof (void *));
+  if (p && cache->ctor)
+    (*cache->ctor) (p, cache, flags);
+  return p;
+}
+
+
+void
+kmem_cache_free (kmem_cache_t *cache, void *p)
+{
+  void **const nextp = (void **) (p + cache->item_size);
+
+  __mutex_lock (&cache->lock);
+  *nextp = cache->freelist;
+  cache->freelist = p;
+  __mutex_unlock (&cache->lock);
+
+  /* XXX eventually destroy some... */
+}
-- 
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