1 | /* |
2 | * Copyright (C) 2017 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "IsoTLSLayout.h" |
27 | |
28 | #include "IsoTLSEntry.h" |
29 | |
30 | namespace bmalloc { |
31 | |
32 | DEFINE_STATIC_PER_PROCESS_STORAGE(IsoTLSLayout); |
33 | |
34 | IsoTLSLayout::IsoTLSLayout(const std::lock_guard<Mutex>&) |
35 | { |
36 | } |
37 | |
38 | void IsoTLSLayout::add(IsoTLSEntry* entry) |
39 | { |
40 | static Mutex addingMutex; |
41 | RELEASE_BASSERT(!entry->m_next); |
42 | std::lock_guard<Mutex> locking(addingMutex); |
43 | if (m_head) { |
44 | RELEASE_BASSERT(m_tail); |
45 | entry->m_offset = roundUpToMultipleOf(entry->alignment(), m_tail->extent()); |
46 | m_tail->m_next = entry; |
47 | m_tail = entry; |
48 | } else { |
49 | RELEASE_BASSERT(!m_tail); |
50 | entry->m_offset = 0; |
51 | m_head = entry; |
52 | m_tail = entry; |
53 | } |
54 | } |
55 | |
56 | } // namespace bmalloc |
57 | |
58 | |