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