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// **********************************************************************
//
// Copyright (c) 2001
// Mutable Realms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#ifndef ICE_UTIL_RMUTEX_H
#define ICE_UTIL_RMUTEX_H
#include <IceUtil/Config.h>
#include <IceUtil/Lock.h>
namespace IceUtil
{
//
// Forward declarations for friend.
//
class Cond;
//
// Recursive Mutex implementation.
//
class ICE_UTIL_API RecMutex
{
public:
//
// Lock & TryLock typedefs.
//
typedef Lock<RecMutex> Lock;
typedef TryLock<RecMutex> TryLock;
RecMutex();
~RecMutex();
//
// Note that lock/trylock & unlock in general should not be used
// directly. Instead use Lock & TryLock.
//
//
// The boolean values are for the Monitor implementation which
// needs to know whether the Mutex has been locked for the first
// time, or unlocked for the last time (that is another thread is
// able to acquire the mutex).
//
//
// Return true if the mutex has been locked for the first time.
//
bool lock() const;
//
// Throw LockedException in the case that the lock call would
// block (that is the mutex is already owned by some other
// thread). Returns true if the mutex has been locked for the
// first time.
//
bool trylock() const;
//
// Returns true if the mutex has been unlocked for the last time
// (false otherwise).
//
bool unlock() const;
private:
// noncopyable
RecMutex(const RecMutex&);
void operator=(const RecMutex&);
//
// LockState and the lock/unlock variations are for use by the
// Condition variable implementation.
//
#ifdef _WIN32
struct LockState
{
int count;
};
#else
struct LockState
{
pthread_mutex_t* mutex;
int count;
};
#endif
void unlock(LockState&) const;
void lock(LockState&) const;
friend class Cond;
#ifdef _WIN32
mutable CRITICAL_SECTION _mutex;
#else
mutable pthread_mutex_t _mutex;
#endif
mutable int _count;
};
} // End namespace IceUtil
#endif
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