diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/linux/semfastmutex-r0drv-linux.c')
| -rw-r--r-- | src/VBox/Runtime/r0drv/linux/semfastmutex-r0drv-linux.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/linux/semfastmutex-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/semfastmutex-r0drv-linux.c new file mode 100644 index 00000000..0e2dff35 --- /dev/null +++ b/src/VBox/Runtime/r0drv/linux/semfastmutex-r0drv-linux.c @@ -0,0 +1,167 @@ +/* $Id: semfastmutex-r0drv-linux.c $ */ +/** @file + * IPRT - Fast Mutex Semaphores, Ring-0 Driver, Linux. + */ + +/* + * 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 "the-linux-kernel.h" +#include "internal/iprt.h" +#include <iprt/semaphore.h> +#include <iprt/alloc.h> +#include <iprt/assert.h> +#include <iprt/asm.h> +#include <iprt/errcore.h> +#if defined(RT_STRICT) || defined(IPRT_DEBUG_SEMS) +# include <iprt/thread.h> +#endif + +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Wrapper for the linux semaphore structure. + */ +typedef struct RTSEMFASTMUTEXINTERNAL +{ + /** Magic value (RTSEMFASTMUTEX_MAGIC). */ + uint32_t u32Magic; + /** the linux semaphore. */ + struct semaphore Semaphore; +#if defined(RT_STRICT) || defined(IPRT_DEBUG_SEMS) + /** For check. */ + RTNATIVETHREAD volatile Owner; +#endif +} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL; + + +RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Allocate. + */ + PRTSEMFASTMUTEXINTERNAL pThis; + pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (!pThis) + return VERR_NO_MEMORY; + + /* + * Initialize. + */ + pThis->u32Magic = RTSEMFASTMUTEX_MAGIC; + sema_init(&pThis->Semaphore, 1); +#if defined(RT_STRICT) || defined(IPRT_DEBUG_SEMS) + pThis->Owner = NIL_RTNATIVETHREAD; +#endif + + *phFastMtx = pThis; + IPRT_LINUX_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemFastMutexCreate); + + +RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx) +{ + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + if (pThis == NIL_RTSEMFASTMUTEX) + return VINF_SUCCESS; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + + ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD); + RTMemFree(pThis); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemFastMutexDestroy); + + +RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + + IPRT_DEBUG_SEMS_STATE(pThis, 'd'); + down(&pThis->Semaphore); +#if defined(RT_STRICT) || defined(IPRT_DEBUG_SEMS) + IPRT_DEBUG_SEMS_STATE(pThis, 'o'); + AssertRelease(pThis->Owner == NIL_RTNATIVETHREAD); + ASMAtomicUoWriteSize(&pThis->Owner, RTThreadNativeSelf()); +#endif + + IPRT_LINUX_RESTORE_EFL_ONLY_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemFastMutexRequest); + + +RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Validate. + */ + PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + +#if defined(RT_STRICT) || defined(IPRT_DEBUG_SEMS) + AssertRelease(pThis->Owner == RTThreadNativeSelf()); + ASMAtomicUoWriteSize(&pThis->Owner, NIL_RTNATIVETHREAD); +#endif + up(&pThis->Semaphore); + IPRT_DEBUG_SEMS_STATE(pThis, 'u'); + + IPRT_LINUX_RESTORE_EFL_ONLY_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemFastMutexRelease); + |