1 //= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Unix specific (non-pthread) RWMutex class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 //===----------------------------------------------------------------------===// 15 //=== WARNING: Implementation here must contain only generic UNIX code that 16 //=== is guaranteed to work on *all* UNIX variants. 17 //===----------------------------------------------------------------------===// 18 19 #include "llvm/Support/Mutex.h" 20 21 namespace llvm { 22 23 using namespace sys; 24 25 // This naive implementation treats readers the same as writers. This 26 // will therefore deadlock if a thread tries to acquire a read lock 27 // multiple times. 28 29 RWMutexImpl::RWMutexImpl() : data_(new MutexImpl(false)) { } 30 31 RWMutexImpl::~RWMutexImpl() { 32 delete static_cast<MutexImpl *>(data_); 33 } 34 35 bool RWMutexImpl::reader_acquire() { 36 return static_cast<MutexImpl *>(data_)->acquire(); 37 } 38 39 bool RWMutexImpl::reader_release() { 40 return static_cast<MutexImpl *>(data_)->release(); 41 } 42 43 bool RWMutexImpl::writer_acquire() { 44 return static_cast<MutexImpl *>(data_)->acquire(); 45 } 46 47 bool RWMutexImpl::writer_release() { 48 return static_cast<MutexImpl *>(data_)->release(); 49 } 50 51 } 52
