tools/profiler/LulRWLock.cpp@6474c204b198 (annotated)
tools/profiler/LulRWLock.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "mozilla/Assertions.h" |
| michael@0 | 8 | #include "mozilla/DebugOnly.h" |
| michael@0 | 9 | #include "mozilla/NullPtr.h" |
| michael@0 | 10 | |
| michael@0 | 11 | #include "LulRWLock.h" |
| michael@0 | 12 | |
| michael@0 | 13 | |
| michael@0 | 14 | namespace lul { |
| michael@0 | 15 | |
| michael@0 | 16 | // An implementation for targets where libpthread does provide |
| michael@0 | 17 | // pthread_rwlock_t. These are straight wrappers around the |
| michael@0 | 18 | // equivalent pthread functions. |
| michael@0 | 19 | |
| michael@0 | 20 | #if defined(LUL_OS_linux) |
| michael@0 | 21 | |
| michael@0 | 22 | LulRWLock::LulRWLock() { |
| michael@0 | 23 | mozilla::DebugOnly<int> r = pthread_rwlock_init(&mLock, nullptr); |
| michael@0 | 24 | MOZ_ASSERT(!r); |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | LulRWLock::~LulRWLock() { |
| michael@0 | 28 | mozilla::DebugOnly<int>r = pthread_rwlock_destroy(&mLock); |
| michael@0 | 29 | MOZ_ASSERT(!r); |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | void |
| michael@0 | 33 | LulRWLock::WrLock() { |
| michael@0 | 34 | mozilla::DebugOnly<int>r = pthread_rwlock_wrlock(&mLock); |
| michael@0 | 35 | MOZ_ASSERT(!r); |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | void |
| michael@0 | 39 | LulRWLock::RdLock() { |
| michael@0 | 40 | mozilla::DebugOnly<int>r = pthread_rwlock_rdlock(&mLock); |
| michael@0 | 41 | MOZ_ASSERT(!r); |
| michael@0 | 42 | } |
| michael@0 | 43 | |
| michael@0 | 44 | void |
| michael@0 | 45 | LulRWLock::Unlock() { |
| michael@0 | 46 | mozilla::DebugOnly<int>r = pthread_rwlock_unlock(&mLock); |
| michael@0 | 47 | MOZ_ASSERT(!r); |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | |
| michael@0 | 51 | // An implementation for cases where libpthread does not provide |
| michael@0 | 52 | // pthread_rwlock_t. Currently this is a kludge in that it uses |
| michael@0 | 53 | // normal mutexes, resulting in the following limitations: (1) at most |
| michael@0 | 54 | // one reader is allowed at once, and (2) any thread that tries to |
| michael@0 | 55 | // read-acquire the lock more than once will deadlock. (2) could be |
| michael@0 | 56 | // avoided if it were possible to use recursive pthread_mutex_t's. |
| michael@0 | 57 | |
| michael@0 | 58 | #elif defined(LUL_OS_android) |
| michael@0 | 59 | |
| michael@0 | 60 | LulRWLock::LulRWLock() { |
| michael@0 | 61 | mozilla::DebugOnly<int> r = pthread_mutex_init(&mLock, nullptr); |
| michael@0 | 62 | MOZ_ASSERT(!r); |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | LulRWLock::~LulRWLock() { |
| michael@0 | 66 | mozilla::DebugOnly<int>r = pthread_mutex_destroy(&mLock); |
| michael@0 | 67 | MOZ_ASSERT(!r); |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | void |
| michael@0 | 71 | LulRWLock::WrLock() { |
| michael@0 | 72 | mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock); |
| michael@0 | 73 | MOZ_ASSERT(!r); |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | void |
| michael@0 | 77 | LulRWLock::RdLock() { |
| michael@0 | 78 | mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock); |
| michael@0 | 79 | MOZ_ASSERT(!r); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | void |
| michael@0 | 83 | LulRWLock::Unlock() { |
| michael@0 | 84 | mozilla::DebugOnly<int>r = pthread_mutex_unlock(&mLock); |
| michael@0 | 85 | MOZ_ASSERT(!r); |
| michael@0 | 86 | } |
| michael@0 | 87 | |
| michael@0 | 88 | |
| michael@0 | 89 | #else |
| michael@0 | 90 | # error "Unsupported OS" |
| michael@0 | 91 | #endif |
| michael@0 | 92 | |
| michael@0 | 93 | } // namespace lul |
