semevent-r0drv-linux.c revision a734bb626f889ee3334bfc381be194b4ec56aae6
/* $Id$ */
/** @file
* IPRT - Single Release Event Semaphores, Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-linux-kernel.h"
#include <iprt/semaphore.h>
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Linux event semaphore.
*/
typedef struct RTSEMEVENTINTERNAL
{
/** Magic value (RTSEMEVENT_MAGIC). */
/** The object status - !0 when signaled and 0 when reset. */
/** The wait queue. */
{
}
RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
{
if (!pThis)
return VERR_NO_MEMORY;
*phEventSem = pThis;
return VINF_SUCCESS;
}
{
/*
* Validate input.
*/
if (pThis == NIL_RTSEMEVENT)
return VINF_SUCCESS;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
/*
* Invalidate it and signal the object just in case.
*/
return VINF_SUCCESS;
}
{
/*
* Validate input.
*/
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
/*
* Signal the event object.
*/
return VINF_SUCCESS;
}
/**
* Worker for RTSemEvent and RTSemEventNoResume.
*
* @returns VBox status code.
* @param pThis The event semaphore.
* @param cMillies The number of milliseconds to wait.
* @param fInterruptible Whether it's an interruptible wait or not.
*/
{
/*
* Ok wait for it.
*/
int rc = VINF_SUCCESS;
#ifdef IPRT_DEBUG_SEMS
#endif
for (;;)
{
/* make everything thru schedule_timeout() atomic scheduling wise. */
/* check the condition. */
break;
/* check for pending signals. */
{
break;
}
/* wait */
after_wait(&Wait);
/* Check if someone destroyed the semaphore while we were waiting. */
{
break;
}
/* check for timeout. */
if (!lTimeout)
{
rc = VERR_TIMEOUT;
break;
}
}
#ifdef IPRT_DEBUG_SEMS
#endif
return rc;
}
{
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
return VINF_SUCCESS;
}
{
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
return VINF_SUCCESS;
}