/* $Id: thread2-r0drv-freebsd.c $ */
/** @file
 * IPRT - Threads (Part 2), Ring-0 Driver, FreeBSD.
 */

/*
 * Contributed by knut st. osmundsen.
 *
 * Copyright (C) 2007-2020 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * 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.
 * --------------------------------------------------------------------
 *
 * This code is based on:
 *
 * 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,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * 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/thread.h>
#include <iprt/errcore.h>
#include <iprt/assert.h>

#include "internal/thread.h"


DECLHIDDEN(int) rtThreadNativeInit(void)
{
    return VINF_SUCCESS;
}


RTDECL(RTTHREAD) RTThreadSelf(void)
{
    return rtThreadGetByNative(RTThreadNativeSelf());
}


DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
{
    int iPriority;

    switch (enmType)
    {
        case RTTHREADTYPE_INFREQUENT_POLLER:    iPriority = PZERO + 8;      break;
        case RTTHREADTYPE_EMULATION:            iPriority = PZERO + 4;      break;
        case RTTHREADTYPE_DEFAULT:              iPriority = PZERO;          break;
        case RTTHREADTYPE_MSG_PUMP:             iPriority = PZERO - 4;      break;
        case RTTHREADTYPE_IO:                   iPriority = PRIBIO;         break;
        case RTTHREADTYPE_TIMER:                iPriority = PRI_MIN_KERN;   break;
        default:
            AssertMsgFailed(("enmType=%d\n", enmType));
            return VERR_INVALID_PARAMETER;
    }

#if __FreeBSD_version < 700000
    /* Do like they're doing in subr_ntoskrnl.c... */
    mtx_lock_spin(&sched_lock);
#else
    thread_lock(curthread);
#endif
    sched_prio(curthread, iPriority);
#if __FreeBSD_version < 600000
    curthread->td_base_pri = iPriority;
#endif
#if __FreeBSD_version < 700000
    mtx_unlock_spin(&sched_lock);
#else
    thread_unlock(curthread);
#endif

    return VINF_SUCCESS;
}


DECLHIDDEN(int) rtThreadNativeAdopt(PRTTHREADINT pThread)
{
    NOREF(pThread);
    /* There is nothing special that needs doing here, but the
       user really better know what he's cooking. */
    return VINF_SUCCESS;
}


DECLHIDDEN(void) rtThreadNativeWaitKludge(PRTTHREADINT pThread)
{
    /** @todo fix RTThreadWait/RTR0Term race on freebsd. */
    RTThreadSleep(1);
}


DECLHIDDEN(void) rtThreadNativeDestroy(PRTTHREADINT pThread)
{
    NOREF(pThread);
}


/**
 * Native thread main function.
 *
 * @param   pvThreadInt     The thread structure.
 */
static void rtThreadNativeMain(void *pvThreadInt)
{
    const struct thread *Self = curthread;
    PRTTHREADINT pThreadInt = (PRTTHREADINT)pvThreadInt;
    int rc;

    rc = rtThreadMain(pThreadInt, (RTNATIVETHREAD)Self, &pThreadInt->szName[0]);

#if __FreeBSD_version >= 800002
    kproc_exit(rc);
#else
    kthread_exit(rc);
#endif
}


DECLHIDDEN(int) rtThreadNativeCreate(PRTTHREADINT pThreadInt, PRTNATIVETHREAD pNativeThread)
{
    int rc;
    struct proc *pProc;

#if __FreeBSD_version >= 800002
    rc = kproc_create(rtThreadNativeMain, pThreadInt, &pProc, RFHIGHPID, 0, "%s", pThreadInt->szName);
#else
    rc = kthread_create(rtThreadNativeMain, pThreadInt, &pProc, RFHIGHPID, 0, "%s", pThreadInt->szName);
#endif
    if (!rc)
    {
        *pNativeThread = (RTNATIVETHREAD)FIRST_THREAD_IN_PROC(pProc);
        rc = VINF_SUCCESS;
    }
    else
        rc = RTErrConvertFromErrno(rc);
    return rc;
}

