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// **********************************************************************
//
// Copyright (c) 2001
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#ifndef ICE_UTIL_MUTEX_H
#define ICE_UTIL_MUTEX_H
#include <IceUtil/Config.h>
#include <IceUtil/Exception.h> // Necessary for inline functions
#include <IceUtil/Lock.h>
namespace IceUtil
{
//
// Forward declaration for friend.
//
class Cond;
//
// Simple non-recursive Mutex implementation.
//
// Don't use noncopyable otherwise you end up with warnings like this:
//
// In file included from Connection.cpp:20:
// ../../include/Ice/Outgoing.h:88: warning: direct base
// `IceUtil::noncopyable' inaccessible in `IceInternal::Outgoing' due
// to ambiguity
//
class ICE_UTIL_API Mutex
{
public:
//
// Lock & TryLock typedefs.
//
typedef Lock<Mutex> Lock;
typedef TryLock<Mutex> TryLock;
Mutex();
~Mutex();
//
// 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
Mutex(const Mutex&);
void operator=(const Mutex&);
//
// LockState and the lock/unlock variations are for use by the
// Condition variable implementation.
//
#ifdef WIN32
struct LockState
{
};
#else
struct LockState
{
pthread_mutex_t* mutex;
};
#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
};
#ifdef WIN32
inline
Mutex::Mutex()
{
InitializeCriticalSection(&_mutex);
}
inline
Mutex::~Mutex()
{
DeleteCriticalSection(&_mutex);
}
inline bool
Mutex::lock() const
{
EnterCriticalSection(&_mutex);
//
// If necessary this can be removed and replaced with a _count
// member (like the UNIX implementation of RecMutex).
//
assert(_mutex.RecursionCount == 1);
return true;
}
inline bool
Mutex::trylock() const
{
if (!TryEnterCriticalSection(&_mutex))
{
throw LockedException(__FILE__, __LINE__);
}
if(_mutex.RecursionCount > 1)
{
LeaveCriticalSection(&_mutex);
throw LockedException(__FILE__, __LINE__);
}
return true;
}
inline bool
Mutex::unlock() const
{
assert(_mutex.RecursionCount == 1);
LeaveCriticalSection(&_mutex);
return true;
}
inline void
Mutex::unlock(LockState& state) const
{
LeaveCriticalSection(&_mutex);
}
inline void
Mutex::lock(LockState&) const
{
EnterCriticalSection(&_mutex);
}
#else
inline
Mutex::Mutex()
{
int rc = pthread_mutex_init(&_mutex, 0);
if (rc != 0)
{
throw SyscallException(strerror(rc), __FILE__, __LINE__);
}
}
inline
Mutex::~Mutex()
{
int rc = 0;
rc = pthread_mutex_destroy(&_mutex);
assert(rc == 0);
}
inline bool
Mutex::lock() const
{
int rc = pthread_mutex_lock(&_mutex);
if (rc != 0)
{
throw SyscallException(strerror(rc), __FILE__, __LINE__);
}
return true;
}
inline bool
Mutex::trylock() const
{
int rc = pthread_mutex_trylock(&_mutex);
if (rc != 0)
{
if (rc == EBUSY)
{
throw LockedException(__FILE__, __LINE__);
}
throw SyscallException(strerror(rc), __FILE__, __LINE__);
}
return true;
}
inline bool
Mutex::unlock() const
{
int rc = pthread_mutex_unlock(&_mutex);
if (rc != 0)
{
throw SyscallException(strerror(rc), __FILE__, __LINE__);
}
return true;
}
inline void
Mutex::unlock(LockState& state) const
{
state.mutex = &_mutex;
}
inline void
Mutex::lock(LockState&) const
{
}
#endif
} // End namespace IceUtil
#endif
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