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// **********************************************************************
//
// Copyright (c) 2003-2018 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_UTIL_RMUTEX_H
#define ICE_UTIL_RMUTEX_H
#include <IceUtil/Config.h>
#include <IceUtil/Lock.h>
#include <IceUtil/ThreadException.h>
#include <IceUtil/MutexProtocol.h>
namespace IceUtil
{
//
// Forward declarations for friend.
//
class Cond;
//
// Recursive Mutex implementation.
//
class ICE_API RecMutex
{
public:
//
// Lock & TryLock typedefs.
//
typedef LockT<RecMutex> Lock;
typedef TryLockT<RecMutex> TryLock;
RecMutex();
RecMutex(const MutexProtocol);
~RecMutex();
//
// Note that lock/tryLock & unlock in general should not be used
// directly. Instead use Lock & TryLock.
//
void lock() const;
//
// Returns true if the lock was acquired or was already acquired
// by the calling thread, and false otherwise.
//
bool tryLock() const;
void unlock() const;
//
// Returns true if the mutex will unlock when calling unlock()
// (false otherwise). For non-recursive mutexes, this will always
// return true.
// This function is used by the Monitor implementation 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).
// Pre-condition: the mutex must be locked.
//
bool willUnlock() const;
private:
void init(const MutexProtocol);
// 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
{
# ifdef ICE_HAS_WIN32_CONDVAR
CRITICAL_SECTION* mutex;
# endif
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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