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/****************************************************************************
* Copyright (C) from 2009 to Present EPAM Systems.
*
* This file is part of Indigo toolkit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***************************************************************************/
#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
};
} // namespace indigo
#endif // __os_sync_wrapper_h__
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