Move atomic ops into their own header
diff --git a/src/hb-atomic-private.hh b/src/hb-atomic-private.hh
new file mode 100644
index 0000000..c4dabe1
--- /dev/null
+++ b/src/hb-atomic-private.hh
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2007 Chris Wilson
+ * Copyright © 2009,2010 Red Hat, Inc.
+ * Copyright © 2011 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Contributor(s):
+ * Chris Wilson <[email protected]>
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_ATOMIC_PRIVATE_HH
+#define HB_ATOMIC_PRIVATE_HH
+
+#include "hb-private.hh"
+
+
+/* atomic_int */
+
+/* We need external help for these */
+
+#if !defined(HB_NO_MT) && defined(HAVE_GLIB)
+
+#include <glib.h>
+typedef volatile int hb_atomic_int_t;
+#if GLIB_CHECK_VERSION(2,29,5)
+#define hb_atomic_int_add(AI, V) g_atomic_int_add (&(AI), V)
+#else
+#define hb_atomic_int_add(AI, V) g_atomic_int_exchange_and_add (&(AI), V)
+#endif
+#define hb_atomic_int_get(AI) g_atomic_int_get (&(AI))
+
+
+#elif !defined(HB_NO_MT) && defined(_MSC_VER) && _MSC_VER >= 1600
+
+#include <intrin.h>
+typedef long hb_atomic_int_t;
+#define hb_atomic_int_add(AI, V) _InterlockedExchangeAdd (&(AI), V)
+#define hb_atomic_int_get(AI) (_ReadBarrier (), (AI))
+
+#elif !defined(HB_NO_MT) && defined(__APPLE__)
+
+#include <libkern/OSAtomic.h>
+typedef int32_t hb_atomic_int_t;
+#define hb_atomic_int_add(AI, V) (OSAtomicAdd32Barrier((V), &(AI)), (AI) - (V))
+#define hb_atomic_int_get(AI) OSAtomicAdd32Barrier(0, &(AI))
+
+#else
+
+#define HB_ATOMIC_INT_NIL 1
+typedef volatile int hb_atomic_int_t;
+#define hb_atomic_int_add(AI, V) ((AI) += (V), (AI) - (V))
+#define hb_atomic_int_get(AI) (AI)
+
+#endif
+
+
+#endif /* HB_ATOMIC_PRIVATE_HH */
