1 /*
2 * Copyright (C) 2015 The Qt Company Ltd.
3 * Copyright (C) 2015 Konstantin Ritt
4 *
5 * Permission is hereby granted, without written agreement and without
6 * license or royalty fees, to use, copy, modify, and distribute this
7 * software and its documentation for any purpose, provided that the
8 * above copyright notice and the following two paragraphs appear in
9 * all copies of this software.
10 *
11 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
12 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
13 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
14 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
15 * DAMAGE.
16 *
17 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
18 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
19 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
20 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
21 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
22 *
23 */
24
25 #include <QtCore/qatomic.h>
26
27 QT_USE_NAMESPACE
28
29 namespace {
30
31 // We need to cast hb_atomic_int_t to QAtomicInt and pointers to
32 // QAtomicPointer instead of using QAtomicOps, otherwise we get a failed
33 // overload resolution of the template arguments for testAndSetOrdered.
34 template <typename T>
makeAtomicPointer(T * const & ptr)35 inline QAtomicPointer<T> *makeAtomicPointer(T * const &ptr)
36 {
37 return reinterpret_cast<QAtomicPointer<T> *>(const_cast<T **>(&ptr));
38 }
39
40 } // namespace
41
42 typedef int hb_atomic_int_impl_t;
43 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
44 #define hb_atomic_int_impl_add(AI, V) reinterpret_cast<QAtomicInt &>(AI).fetchAndAddOrdered(V)
45
46 #define hb_atomic_ptr_impl_get(P) makeAtomicPointer(*(P))->loadAcquire()
47 #define hb_atomic_ptr_impl_cmpexch(P,O,N) makeAtomicPointer(*(P))->testAndSetOrdered((O), (N))
48