semeventmulti-r0drv-linux.c revision 9affb448a727f72781223de5f4c9b09bd3a0ad6f
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Linux.
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * available from http://www.virtualbox.org. This file is free software;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * 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.
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * additional information or have any questions.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync* Header Files *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync* Structures and Typedefs *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Linux event semaphore.
9197680d465154232353e065bfc7e7b0fe026b97vboxsync /** Magic value (RTSEMEVENTMULTI_MAGIC). */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /** The object status - !0 when signaled and 0 when reset. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /** The wait queue. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI pEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Invalidate it and signal the object just in case.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Signal the event object.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Reset it.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Worker for RTSemEventMulti and RTSemEventMultiNoResume.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @returns VBox status code.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param pThis The event semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param cMillies The number of milliseconds to wait.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param fInterruptible Whether it's an interruptible wait or not.
98ead928220b4ddc6626c581287987ae2416ba35vboxsyncstatic int rtSemEventMultiWait(PRTSEMEVENTMULTIINTERNAL pThis, unsigned cMillies, bool fInterruptible)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Ok wait for it.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync long lTimeout = cMillies == RT_INDEFINITE_WAIT ? MAX_SCHEDULE_TIMEOUT : msecs_to_jiffies(cMillies);
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync snprintf(current->comm, TASK_COMM_LEN, "E%lx", IPRT_DEBUG_SEMS_ADDRESS(pThis));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /* make everything thru schedule() atomic scheduling wise. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync prepare_to_wait(&pThis->Head, &Wait, fInterruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /* check the condition. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /* check for pending signals. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /* Check if someone destroyed the semaphore while we were waiting. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync /* check for timeout. */
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync snprintf(current->comm, TASK_COMM_LEN, "E%lx:%d", IPRT_DEBUG_SEMS_ADDRESS(pThis), rc);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
98ead928220b4ddc6626c581287987ae2416ba35vboxsync return rtSemEventMultiWait(pThis, cMillies, false /* fInterruptible */);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiWaitNoResume(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
98ead928220b4ddc6626c581287987ae2416ba35vboxsync return rtSemEventMultiWait(pThis, cMillies, true /* fInterruptible */);