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/* $Id: atexit-vcc.cpp $ */
/** @file
* IPRT - Visual C++ Compiler - Simple atexit implementation.
*/
/*
* Copyright (C) 2006-2023 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
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/mem.h>
#include <iprt/nocrt/stdlib.h>
#include "internal/compiler-vcc.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
typedef struct RTNOCRTATEXITCHUNK
{
PFNRTNOCRTATEXITCALLBACK apfnCallbacks[256];
} RTNOCRTATEXITCHUNK;
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** The first atexit() registration chunk. */
static RTNOCRTATEXITCHUNK g_aAtExitPrealloc;
/** Array of atexit() callback chunk pointers. */
static RTNOCRTATEXITCHUNK *g_apAtExit[8192 / 256] = { &g_aAtExitPrealloc, };
/** Chunk and callback index in one. */
static volatile uint32_t g_idxNextAtExit = 0;
/* Note! not using atexit here because it'll clash with built-in prototype. */
extern "C" int nocrt_atexit(PFNRTNOCRTATEXITCALLBACK pfnCallback) RT_NOEXCEPT
{
AssertPtr(pfnCallback);
/*
* Allocate a table index.
*/
uint32_t idx = ASMAtomicIncU32(&g_idxNextAtExit) - 1;
AssertReturnStmt(idx < RT_ELEMENTS(g_apAtExit) * RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks),
ASMAtomicDecU32(&g_idxNextAtExit), -1);
/*
* Make sure the table chunk is there.
*/
uint32_t idxChunk = idx / RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks);
RTNOCRTATEXITCHUNK *pChunk = ASMAtomicReadPtrT(&g_apAtExit[idxChunk], RTNOCRTATEXITCHUNK *);
if (!pChunk)
{
pChunk = (RTNOCRTATEXITCHUNK *)RTMemAllocZ(sizeof(*pChunk)); /* ASSUMES that the allocator works w/o initialization! */
AssertReturn(pChunk, -1); /* don't try decrement, someone could be racing us... */
if (!ASMAtomicCmpXchgPtr(&g_apAtExit[idxChunk], pChunk, NULL))
{
RTMemFree(pChunk);
pChunk = ASMAtomicReadPtrT(&g_apAtExit[idxChunk], RTNOCRTATEXITCHUNK *);
Assert(pChunk);
}
}
/*
* Add our callback.
*/
pChunk->apfnCallbacks[idxChunk % RT_ELEMENTS(pChunk->apfnCallbacks)] = pfnCallback;
return 0;
}
RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(atexit);
void rtVccTermRunAtExit(void) RT_NOEXCEPT
{
uint32_t idxAtExit = ASMAtomicReadU32(&g_idxNextAtExit);
if (idxAtExit-- > 0)
{
uint32_t idxChunk = idxAtExit / RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks);
uint32_t idxCallback = idxAtExit % RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks);
for (;;)
{
RTNOCRTATEXITCHUNK *pChunk = ASMAtomicReadPtrT(&g_apAtExit[idxChunk], RTNOCRTATEXITCHUNK *);
if (pChunk)
{
do
{
g_idxNextAtExit = idxAtExit--; /* Make sure we don't try problematic atexit callbacks! */
PFNRTNOCRTATEXITCALLBACK pfnCallback = pChunk->apfnCallbacks[idxCallback];
if (pfnCallback) /* Can be NULL see registration code */
{
pfnCallback();
pChunk->apfnCallbacks[idxCallback] = NULL;
}
} while (idxCallback-- > 0);
}
else
idxAtExit -= RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks);
if (idxChunk == 0)
break;
idxChunk--;
idxCallback = RT_ELEMENTS(g_apAtExit[0]->apfnCallbacks) - 1;
}
g_idxNextAtExit = 0;
}
}
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