1 //= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Unix specific (non-pthread) RWMutex class.
12 //===----------------------------------------------------------------------===//
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic UNIX code that
16 //=== is guaranteed to work on *all* UNIX variants.
17 //===----------------------------------------------------------------------===//
19 #include "llvm/Support/Mutex.h"
25 // This naive implementation treats readers the same as writers. This
26 // will therefore deadlock if a thread tries to acquire a read lock
29 RWMutexImpl::RWMutexImpl() : data_(new MutexImpl(false)) { }
31 RWMutexImpl::~RWMutexImpl() {
32 delete static_cast<MutexImpl *>(data_);
35 bool RWMutexImpl::reader_acquire() {
36 return static_cast<MutexImpl *>(data_)->acquire();
39 bool RWMutexImpl::reader_release() {
40 return static_cast<MutexImpl *>(data_)->release();
43 bool RWMutexImpl::writer_acquire() {
44 return static_cast<MutexImpl *>(data_)->acquire();
47 bool RWMutexImpl::writer_release() {
48 return static_cast<MutexImpl *>(data_)->release();