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//= 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();
}
}
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