| //= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Unix specific (non-pthread) RWMutex class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| //===----------------------------------------------------------------------===// |
| //=== WARNING: Implementation here must contain only generic UNIX code that |
| //=== is guaranteed to work on *all* UNIX variants. |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/Mutex.h" |
| |
| namespace llvm { |
| |
| using namespace sys; |
| |
| // This naive implementation treats readers the same as writers. This |
| // will therefore deadlock if a thread tries to acquire a read lock |
| // multiple times. |
| |
| RWMutexImpl::RWMutexImpl() : data_(new MutexImpl(false)) { } |
| |
| RWMutexImpl::~RWMutexImpl() { |
| delete static_cast<MutexImpl *>(data_); |
| } |
| |
| bool RWMutexImpl::reader_acquire() { |
| return static_cast<MutexImpl *>(data_)->acquire(); |
| } |
| |
| bool RWMutexImpl::reader_release() { |
| return static_cast<MutexImpl *>(data_)->release(); |
| } |
| |
| bool RWMutexImpl::writer_acquire() { |
| return static_cast<MutexImpl *>(data_)->acquire(); |
| } |
| |
| bool RWMutexImpl::writer_release() { |
| return static_cast<MutexImpl *>(data_)->release(); |
| } |
| |
| } |