semevent-r0drv-darwin.cpp revision e64031e20c39650a7bc902a3e1aba613b9415dee
/* $Id$ */
/** @file
* IPRT - Event Semaphores, Ring-0 Driver, Darwin.
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* 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.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-darwin-kernel.h"
#include <iprt/semaphore.h>
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Darwin event semaphore.
*/
typedef struct RTSEMEVENTINTERNAL
{
/** Magic value (RTSEMEVENT_MAGIC). */
/** The number of waiting threads. */
/** Set if the event object is signaled. */
/** The number of threads in the process of waking up. */
/** The spinlock protecting us. */
{
}
RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
{
AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
if (pThis)
{
{
*phEventSem = pThis;
return VINF_SUCCESS;
}
}
return VERR_NO_MEMORY;
}
{
if (pThis == NIL_RTSEMEVENT)
return VINF_SUCCESS;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
{
/* abort waiting thread, last man cleans up. */
}
/* the last waking thread is gonna do the cleanup */
else
{
}
return VINF_SUCCESS;
}
{
/** @todo should probably disable interrupts here... update
* semspinmutex-r0drv-generic.c when done. */
{
/** @todo this isn't safe. a scheduling interrupt on the other cpu while we're in here
* could cause the thread to be timed out before we manage to wake it up and the event
* ends up in the wrong state. ditto for posix signals.
* Update: check the return code; it will return KERN_NOT_WAITING if no one is around. */
}
else
return VINF_SUCCESS;
}
static int rtSemEventWait(RTSEMEVENT hEventSem, RTMSINTERVAL cMillies, wait_interrupt_t fInterruptible)
{
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (cMillies)
int rc;
{
rc = VINF_SUCCESS;
}
else if (!cMillies)
rc = VERR_TIMEOUT;
else
{
if (cMillies == RT_INDEFINITE_WAIT)
else
{
u64AbsTime += mach_absolute_time();
}
switch (rcWait)
{
case THREAD_AWAKENED:
{
/* the event was destroyed after we woke up, as the last thread do the cleanup. */
return VINF_SUCCESS;
}
rc = VINF_SUCCESS;
break;
case THREAD_TIMED_OUT:
rc = VERR_TIMEOUT;
break;
case THREAD_INTERRUPTED:
break;
case THREAD_RESTART:
/* Last one out does the cleanup. */
{
return VERR_SEM_DESTROYED;
}
break;
default:
break;
}
}
return rc;
}
{
}
{
}