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|
// **********************************************************************
//
// Copyright (c) 2003-2007 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_STATIC_MUTEX_H
#define ICE_UTIL_STATIC_MUTEX_H
#include <IceUtil/Config.h>
#include <IceUtil/Lock.h>
#include <IceUtil/ThreadException.h>
#if defined(_MSC_VER) && (_MSC_VER < 1300)
//
// Old versions of the Platform SDK don't have InterlockedCompareExchangePointer
//
# ifndef InterlockedCompareExchangePointer
# define InterlockedCompareExchangePointer(Destination, ExChange, Comperand) \
InterlockedCompareExchange(Destination, ExChange, Comperand)
# endif
#endif
namespace IceUtil
{
//
// Forward declaration for friend.
//
class Cond;
//
// Simple non-recursive Mutex implementation.
// These mutexes are POD types (see ISO C++ 9(4) and 8.5.1) and must be
// initialized statically using ICE_STATIC_MUTEX_INITIALIZER.
//
//
class StaticMutex
{
public:
//
// Lock & TryLock typedefs.
//
typedef LockT<StaticMutex> Lock;
typedef TryLockT<StaticMutex> TryLock;
//
// 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, and false otherwise.
//
bool tryLock() const;
void unlock() const;
#ifdef _WIN32
# if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0400
mutable CRITICAL_SECTION* _mutex;
# else
mutable HANDLE _mutex;
mutable int _recursionCount;
# endif
#else
mutable pthread_mutex_t _mutex;
#endif
#if !defined(_MSC_VER) && !defined(__BCPLUSPLUS__)
// COMPILERBUG
// VC++ BC++ considers that aggregates should not have private members ...
// even if it's just functions.
private:
#endif
//
// 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;
#ifdef _WIN32
inline bool initialized() const;
ICE_UTIL_API void initialize() const;
#endif
#ifndef _MSC_VER
friend class Cond;
#endif
};
#ifdef _WIN32
# define ICE_STATIC_MUTEX_INITIALIZER { 0 }
#else
# define ICE_STATIC_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER }
#endif
// A "shared" global mutex that can be used for very simple tasks
// which should not lock any other mutexes.
//
extern ICE_UTIL_API StaticMutex globalMutex;
//
// For performance reasons the following functions are inlined.
//
#ifdef _WIN32
inline bool
StaticMutex::initialized() const
{
//
// Read mutex and then inserts a memory barrier to ensure we can't
// see tmp != 0 before we see the initialized object
//
void* tmp = _mutex;
return InterlockedCompareExchangePointer(reinterpret_cast<void**>(&tmp), 0, 0) != 0;
}
# if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0400
inline void
StaticMutex::lock() const
{
if(!initialized())
{
initialize();
}
EnterCriticalSection(_mutex);
assert(_mutex->RecursionCount == 1);
}
inline bool
StaticMutex::tryLock() const
{
if(!initialized())
{
initialize();
}
if(!TryEnterCriticalSection(_mutex))
{
return false;
}
if(_mutex->RecursionCount > 1)
{
LeaveCriticalSection(_mutex);
throw ThreadLockedException(__FILE__, __LINE__);
}
return true;
}
inline void
StaticMutex::unlock() const
{
assert(_mutex != 0);
assert(_mutex->RecursionCount == 1);
LeaveCriticalSection(_mutex);
}
inline void
StaticMutex::unlock(LockState&) const
{
assert(_mutex != 0);
assert(_mutex->RecursionCount == 1);
LeaveCriticalSection(_mutex);
}
inline void
StaticMutex::lock(LockState&) const
{
if(!initialized())
{
initialize();
}
EnterCriticalSection(_mutex);
}
# else
inline void
StaticMutex::lock() const
{
if(!initialized())
{
initialize();
}
DWORD rc = WaitForSingleObject(_mutex, INFINITE);
if(rc != WAIT_OBJECT_0)
{
if(rc == WAIT_FAILED)
{
throw ThreadSyscallException(__FILE__, __LINE__, GetLastError());
}
else
{
throw ThreadSyscallException(__FILE__, __LINE__, 0);
}
}
_recursionCount++;
assert(_recursionCount == 1);
}
inline bool
StaticMutex::tryLock() const
{
if(!initialized())
{
initialize();
}
DWORD rc = WaitForSingleObject(_mutex, 0);
if(rc != WAIT_OBJECT_0)
{
return false;
}
else if(_recursionCount == 1)
{
_recursionCount++;
unlock();
throw ThreadLockedException(__FILE__, __LINE__);
}
else
{
_recursionCount++;
return true;
}
}
inline void
StaticMutex::unlock() const
{
_recursionCount--;
BOOL rc = ReleaseMutex(_mutex);
if(rc == 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, GetLastError());
}
}
inline void
StaticMutex::unlock(LockState& state) const
{
unlock();
}
inline void
StaticMutex::lock(LockState&) const
{
lock();
}
# endif
#else
inline void
StaticMutex::lock() const
{
int rc = pthread_mutex_lock(&_mutex);
if(rc != 0)
{
if(rc == EDEADLK)
{
throw ThreadLockedException(__FILE__, __LINE__);
}
else
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
}
inline bool
StaticMutex::tryLock() const
{
int rc = pthread_mutex_trylock(&_mutex);
if(rc != 0 && rc != EBUSY)
{
if(rc == EDEADLK)
{
throw ThreadLockedException(__FILE__, __LINE__);
}
else
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
return (rc == 0);
}
inline void
StaticMutex::unlock() const
{
int rc = pthread_mutex_unlock(&_mutex);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
inline void
StaticMutex::unlock(LockState& state) const
{
state.mutex = &_mutex;
}
inline void
StaticMutex::lock(LockState&) const
{
}
#endif
} // End namespace IceUtil
#endif
|
