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/** @file
* IPRT - Generic thread-safe list Class.
*/
/*
* Copyright (C) 2011-2025 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_cpp_mtlist_h
#define IPRT_INCLUDED_cpp_mtlist_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/cpp/list.h>
#include <iprt/semaphore.h>
/** @addtogroup grp_rt_cpp_list
* @{
*/
/**
* A guard class for thread-safe read/write access.
*/
template <>
class RTCListGuard<true>
{
public:
RTCListGuard() : m_hRWSem(NIL_RTSEMRW)
{
#if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3)
RTLOCKVALCLASS hClass;
int rc = RTLockValidatorClassCreate(&hClass, true /*fAutodidact*/, RT_SRC_POS, "RTCListGuard");
AssertStmt(RT_SUCCESS(rc), hClass = NIL_RTLOCKVALCLASS);
rc = RTSemRWCreateEx(&m_hRWSem, 0 /*fFlags*/, hClass, RTLOCKVAL_SUB_CLASS_NONE, NULL /*pszNameFmt*/);
AssertRC(rc);
#else
int rc = RTSemRWCreateEx(&m_hRWSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, 0, NULL);
AssertRC(rc);
#endif
}
~RTCListGuard()
{
RTSemRWDestroy(m_hRWSem);
m_hRWSem = NIL_RTSEMRW;
}
inline void enterRead() const { int rc = RTSemRWRequestRead(m_hRWSem, RT_INDEFINITE_WAIT); AssertRC(rc); }
inline void leaveRead() const { int rc = RTSemRWReleaseRead(m_hRWSem); AssertRC(rc); }
inline void enterWrite() { int rc = RTSemRWRequestWrite(m_hRWSem, RT_INDEFINITE_WAIT); AssertRC(rc); }
inline void leaveWrite() { int rc = RTSemRWReleaseWrite(m_hRWSem); AssertRC(rc); }
/* Define our own new and delete. */
RTMEMEF_NEW_AND_DELETE_OPERATORS();
private:
mutable RTSEMRW m_hRWSem;
};
/**
* @brief Generic thread-safe list class.
*
* RTCMTList is a thread-safe implementation of the list class. It uses a
* read/write semaphore to serialize the access to the items. Several readers
* can simultaneous access different or the same item. If one thread is writing
* to an item, the other accessors are blocked until the write has finished.
*
* Although the access is guarded, the user has to make sure the list content
* is consistent when iterating over the list or doing any other kind of access
* which makes assumptions about the list content. For a finer control of access
* restrictions, use your own locking mechanism and the standard list
* implementation.
*
* @see RTCListBase
*/
template <class T, typename ITYPE = typename RTCIf<(sizeof(T) > sizeof(void*)), T*, T>::result>
class RTCMTList : public RTCListBase<T, ITYPE, true>
{
/* Traits */
typedef RTCListBase<T, ITYPE, true> BASE;
public:
/**
* Creates a new list.
*
* This preallocates @a cCapacity elements within the list.
*
* @param cCapacity The initial capacity the list has.
* @throws std::bad_alloc
*/
RTCMTList(size_t cCapacity = BASE::kDefaultCapacity)
: BASE(cCapacity) {}
/* Define our own new and delete. */
RTMEMEF_NEW_AND_DELETE_OPERATORS();
};
/**
* Specialized thread-safe list class for using the native type list for
* unsigned 64-bit values even on a 32-bit host.
*
* @see RTCListBase
*/
template <>
class RTCMTList<uint64_t>: public RTCListBase<uint64_t, uint64_t, true>
{
/* Traits */
typedef RTCListBase<uint64_t, uint64_t, true> BASE;
public:
/**
* Creates a new list.
*
* This preallocates @a cCapacity elements within the list.
*
* @param cCapacity The initial capacity the list has.
* @throws std::bad_alloc
*/
RTCMTList(size_t cCapacity = BASE::kDefaultCapacity)
: BASE(cCapacity) {}
/* Define our own new and delete. */
RTMEMEF_NEW_AND_DELETE_OPERATORS();
};
/**
* Specialized thread-safe list class for using the native type list for
* signed 64-bit values even on a 32-bit host.
*
* @see RTCListBase
*/
template <>
class RTCMTList<int64_t>: public RTCListBase<int64_t, int64_t, true>
{
/* Traits */
typedef RTCListBase<int64_t, int64_t, true> BASE;
public:
/**
* Creates a new list.
*
* This preallocates @a cCapacity elements within the list.
*
* @param cCapacity The initial capacity the list has.
* @throws std::bad_alloc
*/
RTCMTList(size_t cCapacity = BASE::kDefaultCapacity)
: BASE(cCapacity) {}
/* Define our own new and delete. */
RTMEMEF_NEW_AND_DELETE_OPERATORS();
};
/** @} */
#endif /* !IPRT_INCLUDED_cpp_mtlist_h */
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