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//===- llvm/System/Mutex.h - Mutex Operating System Concept -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys::Mutex class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_MUTEX_H
#define LLVM_SYSTEM_MUTEX_H
namespace llvm
{
namespace sys
{
/// @brief Platform agnostic Mutex class.
class Mutex
{
/// @name Constructors
/// @{
public:
/// Initializes the lock but doesn't acquire it. if \p recursive is set
/// to false, the lock will not be recursive which makes it cheaper but
/// also more likely to deadlock (same thread can't acquire more than
/// once).
/// @brief Default Constructor.
Mutex ( bool recursive = true );
/// Releases and removes the lock
/// @brief Destructor
~Mutex ( void );
/// @}
/// @name Methods
/// @{
public:
/// Attempts to unconditionally acquire the lock. If the lock is held by
/// another thread, 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.
bool acquire();
/// Attempts to release the lock. If the lock is held by the current
/// thread, the lock is released allowing other threads to acquire the
/// lock.
/// @returns false if any kind of error occurs, true otherwise.
/// @brief Unconditionally release the lock.
bool release(void);
/// Attempts to acquire the lock without blocking. If the lock is not
/// available, this function returns false quickly (without blocking). If
/// the lock is available, it is acquired.
/// @returns false if any kind of error occurs or the lock is not
/// available, true otherwise.
/// @brief Try to acquire the lock.
bool tryacquire();
//@}
/// @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:
Mutex(const Mutex & original);
void operator=(const Mutex &);
/// @}
};
}
}
#endif
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