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/****************************************************************************
* Copyright (C) 2009-2015 EPAM Systems
*
* This file is part of Indigo toolkit.
*
* This file may be distributed and/or modified under the terms of the
* GNU General Public License version 3 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in the
* packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
***************************************************************************/
#ifndef __os_sync_wrapper_h__
#define __os_sync_wrapper_h__
#include "base_c/defs.h"
#include "base_c/os_sync.h"
#include "base_cpp/exception.h"
namespace indigo {
// os_mutex wrapper
class DLLEXPORT OsLock
{
public:
OsLock ();
~OsLock ();
void Lock ();
void Unlock ();
private:
os_mutex _mutex;
};
// Automatic lock/unlock
template <typename T, bool lock_can_be_null>
class OsLockerT
{
public:
OsLockerT (T *lock) : _lock(lock)
{
if (_lock != NULL)
_lock->Lock();
else if (!lock_can_be_null)
throw Exception("Passed lock object pointer is NULL");
}
OsLockerT (T &lock) : _lock(&lock)
{
_lock->Lock();
}
~OsLockerT ()
{
if (_lock != NULL)
_lock->Unlock();
}
private:
T *_lock;
};
typedef OsLockerT<OsLock, false> OsLocker;
typedef OsLockerT<OsLock, true> OsLockerNullable;
//
// Semaphore wrapper
//
class DLLEXPORT OsSemaphore
{
public:
OsSemaphore (int initial_count, int max_count);
~OsSemaphore ();
void Wait ();
void Post ();
private:
os_semaphore _sem;
};
//
// Message system
//
class OsMessageSystem
{
public:
OsMessageSystem ();
void SendMsg (int message, void *param = 0);
void RecvMsg (int *message, void **result = 0);
private:
OsSemaphore _sendSem;
OsSemaphore _finishRecvSem;
OsLock _sendLock;
OsLock _recvLock;
volatile int _localMessage;
void * volatile _localParam;
};
//
// Thread-safe static local variables initialization object
//
DLLEXPORT OsLock & osStaticObjConstructionLock ();
// Local static variables with constructors should have OsLock
// guard to avoid thread conflicts.
// This object should be declared as ONLY static object because
// _was_created variable should be zero by default.
template <typename T>
class ThreadSafeStaticObj
{
public:
~ThreadSafeStaticObj()
{
if (_was_created)
{
_obj->~T();
_obj = 0;
_was_created = false;
}
}
T * ptr ()
{
return _ptr();
}
T & ref ()
{
return *_ptr();
}
T * operator -> ()
{
return ptr();
}
private:
void _ensureInitialized ()
{
if (!_was_created)
{
OsLocker locker(osStaticObjConstructionLock());
if (!_was_created)
{
_obj = new ((void *)_obj_data) T;
_was_created = true;
}
}
}
T * _ptr ()
{
_ensureInitialized();
return _obj;
}
T *_obj;
char _obj_data[sizeof(T)];
volatile bool _was_created; // Zero for static objects
};
}
#endif // __os_sync_wrapper_h__
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