1 files changed, 90 insertions, 0 deletions
diff --git a/zbar/refcnt.h b/zbar/refcnt.h
new file mode 100644
index 0000000..259fab3
--- /dev/null
+++ b/zbar/refcnt.h
@@ -0,0 +1,90 @@
+/*------------------------------------------------------------------------
+ *  Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
+ *
+ *  This file is part of the ZBar Bar Code Reader.
+ *
+ *  The ZBar Bar Code Reader is free software; you can redistribute it
+ *  and/or modify it under the terms of the GNU Lesser Public License as
+ *  published by the Free Software Foundation; either version 2.1 of
+ *  the License, or (at your option) any later version.
+ *
+ *  The ZBar Bar Code Reader 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 Lesser Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser Public License
+ *  along with the ZBar Bar Code Reader; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ *  Boston, MA  02110-1301  USA
+ *
+ *  http://sourceforge.net/projects/zbar
+ *------------------------------------------------------------------------*/
+#ifndef _REFCNT_H_
+#define _REFCNT_H_
+
+#include "config.h"
+#include <assert.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+
+typedef LONG refcnt_t;
+
+static inline int _zbar_refcnt(refcnt_t *cnt, int delta)
+{
+    int rc = -1;
+    if (delta > 0)
+	while (delta--)
+	    rc = InterlockedIncrement(cnt);
+    else if (delta < 0)
+	while (delta++)
+	    rc = InterlockedDecrement(cnt);
+    assert(rc >= 0);
+    return (rc);
+}
+
+#elif defined(TARGET_OS_MAC)
+#include <libkern/OSAtomic.h>
+
+typedef int32_t refcnt_t;
+
+static inline int _zbar_refcnt(refcnt_t *cnt, int delta)
+{
+    int rc = OSAtomicAdd32Barrier(delta, cnt);
+    assert(rc >= 0);
+    return (rc);
+}
+
+#elif defined(HAVE_LIBPTHREAD)
+#include <pthread.h>
+
+typedef int refcnt_t;
+
+extern pthread_mutex_t _zbar_reflock;
+
+static inline int _zbar_refcnt(refcnt_t *cnt, int delta)
+{
+    pthread_mutex_lock(&_zbar_reflock);
+    int rc = (*cnt += delta);
+    pthread_mutex_unlock(&_zbar_reflock);
+    assert(rc >= 0);
+    return (rc);
+}
+
+#else
+
+typedef int refcnt_t;
+
+static inline int _zbar_refcnt(refcnt_t *cnt, int delta)
+{
+    int rc = (*cnt += delta);
+    assert(rc >= 0);
+    return (rc);
+}
+
+#endif
+
+void _zbar_refcnt_init(void);
+
+#endif