1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/tools/profiler/LulRWLock.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "mozilla/Assertions.h"
1.11 +#include "mozilla/DebugOnly.h"
1.12 +#include "mozilla/NullPtr.h"
1.13 +
1.14 +#include "LulRWLock.h"
1.15 +
1.16 +
1.17 +namespace lul {
1.18 +
1.19 +// An implementation for targets where libpthread does provide
1.20 +// pthread_rwlock_t. These are straight wrappers around the
1.21 +// equivalent pthread functions.
1.22 +
1.23 +#if defined(LUL_OS_linux)
1.24 +
1.25 +LulRWLock::LulRWLock() {
1.26 + mozilla::DebugOnly<int> r = pthread_rwlock_init(&mLock, nullptr);
1.27 + MOZ_ASSERT(!r);
1.28 +}
1.29 +
1.30 +LulRWLock::~LulRWLock() {
1.31 + mozilla::DebugOnly<int>r = pthread_rwlock_destroy(&mLock);
1.32 + MOZ_ASSERT(!r);
1.33 +}
1.34 +
1.35 +void
1.36 +LulRWLock::WrLock() {
1.37 + mozilla::DebugOnly<int>r = pthread_rwlock_wrlock(&mLock);
1.38 + MOZ_ASSERT(!r);
1.39 +}
1.40 +
1.41 +void
1.42 +LulRWLock::RdLock() {
1.43 + mozilla::DebugOnly<int>r = pthread_rwlock_rdlock(&mLock);
1.44 + MOZ_ASSERT(!r);
1.45 +}
1.46 +
1.47 +void
1.48 +LulRWLock::Unlock() {
1.49 + mozilla::DebugOnly<int>r = pthread_rwlock_unlock(&mLock);
1.50 + MOZ_ASSERT(!r);
1.51 +}
1.52 +
1.53 +
1.54 +// An implementation for cases where libpthread does not provide
1.55 +// pthread_rwlock_t. Currently this is a kludge in that it uses
1.56 +// normal mutexes, resulting in the following limitations: (1) at most
1.57 +// one reader is allowed at once, and (2) any thread that tries to
1.58 +// read-acquire the lock more than once will deadlock. (2) could be
1.59 +// avoided if it were possible to use recursive pthread_mutex_t's.
1.60 +
1.61 +#elif defined(LUL_OS_android)
1.62 +
1.63 +LulRWLock::LulRWLock() {
1.64 + mozilla::DebugOnly<int> r = pthread_mutex_init(&mLock, nullptr);
1.65 + MOZ_ASSERT(!r);
1.66 +}
1.67 +
1.68 +LulRWLock::~LulRWLock() {
1.69 + mozilla::DebugOnly<int>r = pthread_mutex_destroy(&mLock);
1.70 + MOZ_ASSERT(!r);
1.71 +}
1.72 +
1.73 +void
1.74 +LulRWLock::WrLock() {
1.75 + mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock);
1.76 + MOZ_ASSERT(!r);
1.77 +}
1.78 +
1.79 +void
1.80 +LulRWLock::RdLock() {
1.81 + mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock);
1.82 + MOZ_ASSERT(!r);
1.83 +}
1.84 +
1.85 +void
1.86 +LulRWLock::Unlock() {
1.87 + mozilla::DebugOnly<int>r = pthread_mutex_unlock(&mLock);
1.88 + MOZ_ASSERT(!r);
1.89 +}
1.90 +
1.91 +
1.92 +#else
1.93 +# error "Unsupported OS"
1.94 +#endif
1.95 +
1.96 +} // namespace lul
