semevent-r0drv-freebsd.c revision a9955e049b100e600152b2479d71bd6021726e21
/* $Id$ */
/** @file
* IPRT - Single Release Event Semaphores, Ring-0 Driver, FreeBSD.
*/
/*
* Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-freebsd-kernel.h"
#include <iprt/semaphore.h>
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* FreeBSD 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 FreeBSD spinlock protecting this structure. */
{
Assert(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
if (pEventInt)
{
return VINF_SUCCESS;
}
return VERR_NO_MEMORY;
}
{
return VERR_INVALID_HANDLE;
{
/* abort waiting thread, last man cleans up. */
}
/* the last waking thread is gonna do the cleanup */
else
{
}
return VINF_SUCCESS;
}
{
{
}
else
return VINF_SUCCESS;
}
{
int rc;
{
rc = VINF_SUCCESS;
}
else
{
/*
* Translate milliseconds into ticks and go to sleep.
*/
if (cMillies != RT_INDEFINITE_WAIT)
{
}
/** @todo r=bird: This doesn't handle cMillies == 0 correctly, it will assert
* and or sleep for ever according to r47861. (That's probably an old bug
* of my making.)
*
* And it really looks like it's racing signalling on MP systems. (It
* *looks* like you leave the lock and then tries to go to sleep on a
* block id, someone spinning on the lock attempt to wake us up before we
* go to sleep. That's why the code was originally trying to use msleep
* here.). */
"iprtev", /* max 6 chars */
? 0
switch (rc)
{
case 0:
{
rc = VINF_SUCCESS;
}
else
{
* could've woken up just before destruction... */
{
/* The event was destroyed, as the last thread do the cleanup.
we don't actually know whether */
return rc;
}
}
break;
case EWOULDBLOCK:
rc = VERR_TIMEOUT;
break;
case EINTR:
case ERESTART:
break;
default:
break;
}
}
return rc;
}
{
}
{
}