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//===- RWMutex.h - Reader/Writer Mutual Exclusion Lock ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys::RWMutex class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_MUTEX_H
#define LLVM_SYSTEM_MUTEX_H
namespace llvm
{
namespace sys
{
/// @brief Platform agnostic Mutex class.
class RWMutex
{
/// @name Constructors
/// @{
public:
/// Initializes the lock but doesn't acquire it.
/// @brief Default Constructor.
explicit RWMutex();
/// Releases and removes the lock
/// @brief Destructor
~RWMutex();
/// @}
/// @name Methods
/// @{
public:
/// Attempts to unconditionally acquire the lock in reader mode. If the
/// lock is held by a writer, this method will wait until it can acquire
/// the lock.
/// @returns false if any kind of error occurs, true otherwise.
/// @brief Unconditionally acquire the lock in reader mode.
bool reader_acquire();
/// Attempts to release the lock in reader mode.
/// @returns false if any kind of error occurs, true otherwise.
/// @brief Unconditionally release the lock in reader mode.
bool reader_release();
/// Attempts to unconditionally acquire the lock in reader mode. If the
/// lock is held by any readers, this method will wait until it can
/// acquire the lock.
/// @returns false if any kind of error occurs, true otherwise.
/// @brief Unconditionally acquire the lock in writer mode.
bool writer_acquire();
/// Attempts to release the lock in writer mode.
/// @returns false if any kind of error occurs, true otherwise.
/// @brief Unconditionally release the lock in write mode.
bool writer_release();
//@}
/// @name Platform Dependent Data
/// @{
private:
#ifdef ENABLE_THREADS
void* data_; ///< We don't know what the data will be
#endif
/// @}
/// @name Do Not Implement
/// @{
private:
RWMutex(const RWMutex & original);
void operator=(const RWMutex &);
/// @}
};
}
}
#endif
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