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/* $Id: semmutex-r0drv-netbsd.c $ */
/** @file
* IPRT - Mutex Semaphores, Ring-0 Driver, NetBSD.
*/
/*
* Copyright (C) 2010-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define RTSEMMUTEX_WITHOUT_REMAPPING
#include "the-netbsd-kernel.h"
#include "internal/iprt.h"
#include <iprt/semaphore.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/mem.h>
#include <iprt/thread.h>
#include <iprt/time.h>
#include "internal/magics.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* Wrapper for the NetBSD (sleep) mutex.
*/
typedef struct RTSEMMUTEXINTERNAL
{
/** Magic value (RTSEMMUTEX_MAGIC). */
uint32_t u32Magic;
/** The NetBSD shared/exclusive lock mutex. */
struct sx SxLock;
} RTSEMMUTEXINTERNAL, *PRTSEMMUTEXINTERNAL;
RTDECL(int) RTSemMutexCreate(PRTSEMMUTEX phMutexSem)
{
AssertCompile(sizeof(RTSEMMUTEXINTERNAL) > sizeof(void *));
AssertPtrReturn(phMutexSem, VERR_INVALID_POINTER);
PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
if (pThis)
{
pThis->u32Magic = RTSEMMUTEX_MAGIC;
sx_init_flags(&pThis->SxLock, "IPRT Mutex Semaphore", SX_RECURSE);
*phMutexSem = pThis;
return VINF_SUCCESS;
}
return VERR_NO_MEMORY;
}
RTDECL(int) RTSemMutexDestroy(RTSEMMUTEX hMutexSem)
{
PRTSEMMUTEXINTERNAL pThis = hMutexSem;
if (pThis == NIL_RTSEMMUTEX)
return VINF_SUCCESS;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSEMMUTEX_MAGIC_DEAD, RTSEMMUTEX_MAGIC), VERR_INVALID_HANDLE);
sx_destroy(&pThis->SxLock);
RTMemFree(pThis);
return VINF_SUCCESS;
}
RTDECL(int) RTSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
{
PRTSEMMUTEXINTERNAL pThis = hMutexSem;
int rc;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (cMillies == RT_INDEFINITE_WAIT)
{
sx_xlock(&pThis->SxLock);
rc = VINF_SUCCESS;
}
else if (!cMillies)
{
if (sx_try_xlock(&pThis->SxLock))
rc = VINF_SUCCESS;
else
rc = VERR_TIMEOUT;
}
/*
* GROSS HACK: poll implementation of timeout.
*/
/** @todo Implement timeouts in RTSemMutexRequest. */
else if (sx_try_xlock(&pThis->SxLock))
rc = VINF_SUCCESS;
else
{
uint64_t StartTS = RTTimeSystemMilliTS();
rc = VERR_TIMEOUT;
do
{
RTThreadSleep(1);
if (sx_try_xlock(&pThis->SxLock))
{
rc = VINF_SUCCESS;
break;
}
} while (RTTimeSystemMilliTS() - StartTS < cMillies);
}
return rc;
}
RTDECL(int) RTSemMutexRequestDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
{
return RTSemMutexRequest(hMutexSem, cMillies);
}
RTDECL(int) RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
{
PRTSEMMUTEXINTERNAL pThis = hMutexSem;
int rc;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (cMillies == RT_INDEFINITE_WAIT)
{
if (!sx_xlock_sig(&pThis->SxLock))
rc = VINF_SUCCESS;
else
rc = VERR_INTERRUPTED;
}
else if (!cMillies)
{
if (sx_try_xlock(&pThis->SxLock))
rc = VINF_SUCCESS;
else
rc = VERR_TIMEOUT;
}
/*
* GROSS HACK: poll implementation of timeout.
*/
/** @todo Implement timeouts and interrupt checks in
* RTSemMutexRequestNoResume. */
else if (sx_try_xlock(&pThis->SxLock))
rc = VINF_SUCCESS;
else
{
uint64_t StartTS = RTTimeSystemMilliTS();
rc = VERR_TIMEOUT;
do
{
RTThreadSleep(1);
if (sx_try_xlock(&pThis->SxLock))
{
rc = VINF_SUCCESS;
break;
}
} while (RTTimeSystemMilliTS() - StartTS < cMillies);
}
return rc;
}
RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
{
return RTSemMutexRequestNoResume(hMutexSem, cMillies);
}
RTDECL(int) RTSemMutexRelease(RTSEMMUTEX hMutexSem)
{
PRTSEMMUTEXINTERNAL pThis = hMutexSem;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
sx_xunlock(&pThis->SxLock);
return VINF_SUCCESS;
}
RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem)
{
PRTSEMMUTEXINTERNAL pThis = hMutexSem;
AssertPtrReturn(pThis, false);
AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), false);
return sx_xlocked(&pThis->SxLock);
}
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