semfastmutex-r0drv-linux.c revision e205d4c80367d15b2a8240be8a5e676764f34d70
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Fast Mutex Semaphores, Ring-0 Driver, Linux.
e205d4c80367d15b2a8240be8a5e676764f34d70vboxsync * Copyright (C) 2006-2011 Oracle Corporation
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * available from http://www.virtualbox.org. This file is free software;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * you can redistribute it and/or modify it under the terms of the GNU
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * General Public License (GPL) as published by the Free Software
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * The contents of this file may alternatively be used under the terms
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * of the Common Development and Distribution License Version 1.0
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution, in which case the provisions of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * CDDL are applicable instead of those of the GPL.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * You may elect to license modified versions of this file under the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * terms and conditions of either the GPL or the CDDL or both.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/*******************************************************************************
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync* Header Files *
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync*******************************************************************************/
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/*******************************************************************************
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync* Structures and Typedefs *
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync*******************************************************************************/
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Wrapper for the linux semaphore structure.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** Magic value (RTSEMFASTMUTEX_MAGIC). */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** the linux semaphore. */
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync /** For check. */
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsyncRTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Allocate.
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Initialize.
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsyncRTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate.
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsyncRTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate.
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync ASMAtomicUoWriteSize(&pThis->Owner, RTThreadNativeSelf());
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsyncRTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate.
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
47c238f82281a3771c8bfb66858da823ecf03dbcvboxsync AssertRelease(pThis->Owner == RTThreadNativeSelf());