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Diffstat (limited to '')
-rw-r--r-- | mozglue/misc/RWLock_posix.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/mozglue/misc/RWLock_posix.cpp b/mozglue/misc/RWLock_posix.cpp new file mode 100644 index 0000000000..970bddd1aa --- /dev/null +++ b/mozglue/misc/RWLock_posix.cpp @@ -0,0 +1,64 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifdef XP_WIN +# error This file should only be compiled on non-Windows platforms. +#endif + +#include "mozilla/PlatformRWLock.h" + +#include "mozilla/Assertions.h" + +#include <errno.h> + +// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init) +mozilla::detail::RWLockImpl::RWLockImpl() { + MOZ_RELEASE_ASSERT(pthread_rwlock_init(&mRWLock, nullptr) == 0, + "pthread_rwlock_init failed"); +} + +mozilla::detail::RWLockImpl::~RWLockImpl() { + MOZ_RELEASE_ASSERT(pthread_rwlock_destroy(&mRWLock) == 0, + "pthread_rwlock_destroy failed"); +} + +bool mozilla::detail::RWLockImpl::tryReadLock() { + int rv = pthread_rwlock_tryrdlock(&mRWLock); + // We allow EDEADLK here because it has been observed returned on macos when + // the write lock is held by the current thread. + MOZ_RELEASE_ASSERT(rv == 0 || rv == EBUSY || rv == EDEADLK, + "pthread_rwlock_tryrdlock failed"); + return rv == 0; +} + +void mozilla::detail::RWLockImpl::readLock() { + MOZ_RELEASE_ASSERT(pthread_rwlock_rdlock(&mRWLock) == 0, + "pthread_rwlock_rdlock failed"); +} + +void mozilla::detail::RWLockImpl::readUnlock() { + MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(&mRWLock) == 0, + "pthread_rwlock_unlock failed"); +} + +bool mozilla::detail::RWLockImpl::tryWriteLock() { + int rv = pthread_rwlock_trywrlock(&mRWLock); + // We allow EDEADLK here because it has been observed returned on macos when + // the write lock is held by the current thread. + MOZ_RELEASE_ASSERT(rv == 0 || rv == EBUSY || rv == EDEADLK, + "pthread_rwlock_trywrlock failed"); + return rv == 0; +} + +void mozilla::detail::RWLockImpl::writeLock() { + MOZ_RELEASE_ASSERT(pthread_rwlock_wrlock(&mRWLock) == 0, + "pthread_rwlock_wrlock failed"); +} + +void mozilla::detail::RWLockImpl::writeUnlock() { + MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(&mRWLock) == 0, + "pthread_rwlock_unlock failed"); +} |