diff options
Diffstat (limited to 'src/VBox/Runtime/common/compiler/vcc/atexit-vcc.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/compiler/vcc/atexit-vcc.cpp | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/compiler/vcc/atexit-vcc.cpp b/src/VBox/Runtime/common/compiler/vcc/atexit-vcc.cpp new file mode 100644 index 00000000..f6fad758 --- /dev/null +++ b/src/VBox/Runtime/common/compiler/vcc/atexit-vcc.cpp @@ -0,0 +1,145 @@ +/* $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; + } +} + |