Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

external/llvm/lib/Support/Unix/RWMutex.inc

@@ -1,51 +0,0 @@
-//= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock  =//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// 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();
-}
-
-}