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diff --git a/include/yaz/shptr.h b/include/yaz/shptr.h
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+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2010 Index Data.
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Index Data nor the names of its contributors
+ *       may be used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file shptr.h
+ * \brief Shared pointer macros
+ */
+
+#ifndef YAZ_SHARED_PTR_H
+#define YAZ_SHARED_PTR_H
+
+#include <yaz/xmalloc.h>
+#include <yaz/mutex.h>
+
+YAZ_BEGIN_CDECL
+
+#define YAZ_SHPTR_TYPE(type) \
+    struct type##_shptr \
+    {                          \
+    type ptr;                  \
+    int ref;                   \
+    YAZ_MUTEX mutex;           \
+    };  \
+    typedef struct type##_shptr *type##_shptr_t;
+
+#define YAZ_SHPTR_INIT(p,n) {                   \
+        p = xmalloc(sizeof(*p));                \
+        p->ptr = n;                             \
+        p->ref = 1;                             \
+        p->mutex = 0;  \
+        yaz_mutex_create(&p->mutex);            \
+    }
+
+#define YAZ_SHPTR_INC(p) {                      \
+        yaz_mutex_enter(p->mutex);              \
+        p->ref++;                               \
+        yaz_mutex_leave(p->mutex);              \
+    }
+
+#define YAZ_SHPTR_DEC(p, destroy)  {             \
+    yaz_mutex_enter(p->mutex);                   \
+    if (--p->ref == 0) {                         \
+        yaz_mutex_leave(p->mutex);               \
+        destroy(p->ptr);                         \
+        yaz_mutex_destroy(&p->mutex);            \
+        xfree(p);                                \
+        p = 0;                                   \
+    } else { \
+    yaz_mutex_leave(p->mutex); \
+    } \
+    }
+
+YAZ_END_CDECL
+
+#endif
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+