r0drv/darwin/semevent-r0drv-darwin.cpp

05afe08870681beb0792f384475077c988916762vboxsync/* $Id$ */
05afe08870681beb0792f384475077c988916762vboxsync/** @file
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * IPRT - Single Release Event Semaphores, Ring-0 Driver, Darwin.
05afe08870681beb0792f384475077c988916762vboxsync */
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync/*
c58f1213e628a545081c70e26c6b67a841cff880vboxsync * Copyright (C) 2006-2011 Oracle Corporation
05afe08870681beb0792f384475077c988916762vboxsync *
05afe08870681beb0792f384475077c988916762vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
05afe08870681beb0792f384475077c988916762vboxsync * available from http://www.virtualbox.org. This file is free software;
05afe08870681beb0792f384475077c988916762vboxsync * you can redistribute it and/or modify it under the terms of the GNU
05afe08870681beb0792f384475077c988916762vboxsync * General Public License (GPL) as published by the Free Software
05afe08870681beb0792f384475077c988916762vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
05afe08870681beb0792f384475077c988916762vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
05afe08870681beb0792f384475077c988916762vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
05afe08870681beb0792f384475077c988916762vboxsync *
05afe08870681beb0792f384475077c988916762vboxsync * The contents of this file may alternatively be used under the terms
05afe08870681beb0792f384475077c988916762vboxsync * of the Common Development and Distribution License Version 1.0
05afe08870681beb0792f384475077c988916762vboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
05afe08870681beb0792f384475077c988916762vboxsync * VirtualBox OSE distribution, in which case the provisions of the
05afe08870681beb0792f384475077c988916762vboxsync * CDDL are applicable instead of those of the GPL.
05afe08870681beb0792f384475077c988916762vboxsync *
05afe08870681beb0792f384475077c988916762vboxsync * You may elect to license modified versions of this file under the
05afe08870681beb0792f384475077c988916762vboxsync * terms and conditions of either the GPL or the CDDL or both.
05afe08870681beb0792f384475077c988916762vboxsync */
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync/*******************************************************************************
05afe08870681beb0792f384475077c988916762vboxsync*   Header Files                                                               *
05afe08870681beb0792f384475077c988916762vboxsync*******************************************************************************/
715e49c31b15c23c17a9ce3be42a75e7c48d4b78vboxsync#define RTSEMEVENT_WITHOUT_REMAPPING
05afe08870681beb0792f384475077c988916762vboxsync#include "the-darwin-kernel.h"
05afe08870681beb0792f384475077c988916762vboxsync#include "internal/iprt.h"
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/semaphore.h>
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/assert.h>
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/asm.h>
a8f65e585466d1267633cea76b4f97a69b7f1cc0vboxsync#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
a8f65e585466d1267633cea76b4f97a69b7f1cc0vboxsync# include <iprt/asm-amd64-x86.h>
a8f65e585466d1267633cea76b4f97a69b7f1cc0vboxsync#endif
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/err.h>
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#include <iprt/list.h>
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#include <iprt/lockvalidator.h>
a8f65e585466d1267633cea76b4f97a69b7f1cc0vboxsync#include <iprt/mem.h>
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/mp.h>
05afe08870681beb0792f384475077c988916762vboxsync#include <iprt/thread.h>
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#include <iprt/time.h>
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync#include "internal/magics.h"
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync/*******************************************************************************
05afe08870681beb0792f384475077c988916762vboxsync*   Structures and Typedefs                                                    *
05afe08870681beb0792f384475077c988916762vboxsync*******************************************************************************/
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync/**
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * Waiter entry.  Lives on the stack.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsynctypedef struct RTSEMEVENTDARWINENTRY
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /** The list node. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    RTLISTNODE  Node;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /** Flag set when waking up the thread by signal or destroy. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    bool volatile fWokenUp;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync} RTSEMEVENTDARWINENTRY;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync/** Pointer to waiter entry. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsynctypedef RTSEMEVENTDARWINENTRY *PRTSEMEVENTDARWINENTRY;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
05afe08870681beb0792f384475077c988916762vboxsync/**
05afe08870681beb0792f384475077c988916762vboxsync * Darwin event semaphore.
05afe08870681beb0792f384475077c988916762vboxsync */
05afe08870681beb0792f384475077c988916762vboxsynctypedef struct RTSEMEVENTINTERNAL
05afe08870681beb0792f384475077c988916762vboxsync{
05afe08870681beb0792f384475077c988916762vboxsync    /** Magic value (RTSEMEVENT_MAGIC). */
05afe08870681beb0792f384475077c988916762vboxsync    uint32_t volatile   u32Magic;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /** Reference counter. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    uint32_t volatile   cRefs;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /** Set if there are blocked threads. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    bool volatile       fHaveBlockedThreads;
05afe08870681beb0792f384475077c988916762vboxsync    /** Set if the event object is signaled. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    bool volatile       fSignaled;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /** List of waiting and woken up threads. */
e961f5bfe1727c6816d3dad3805ebe21b6ba1c64vboxsync    RTLISTANCHOR        WaitList;
05afe08870681beb0792f384475077c988916762vboxsync    /** The spinlock protecting us. */
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_t         *pSpinlock;
05afe08870681beb0792f384475077c988916762vboxsync} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsyncRTDECL(int)  RTSemEventCreate(PRTSEMEVENT phEventSem)
05afe08870681beb0792f384475077c988916762vboxsync{
05afe08870681beb0792f384475077c988916762vboxsync    return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsyncRTDECL(int)  RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
05afe08870681beb0792f384475077c988916762vboxsync{
05afe08870681beb0792f384475077c988916762vboxsync    AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
418b9db49fbc652ef9c3f030fdc0f1a322403d95vboxsync    AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
418b9db49fbc652ef9c3f030fdc0f1a322403d95vboxsync    Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
05afe08870681beb0792f384475077c988916762vboxsync    AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
05afe08870681beb0792f384475077c988916762vboxsync    RT_ASSERT_PREEMPTIBLE();
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync    PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis));
05afe08870681beb0792f384475077c988916762vboxsync    if (pThis)
05afe08870681beb0792f384475077c988916762vboxsync    {
05afe08870681beb0792f384475077c988916762vboxsync        pThis->u32Magic = RTSEMEVENT_MAGIC;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        pThis->cRefs                = 1;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        pThis->fHaveBlockedThreads  = false;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        pThis->fSignaled            = false;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        RTListInit(&pThis->WaitList);
05afe08870681beb0792f384475077c988916762vboxsync        Assert(g_pDarwinLockGroup);
05afe08870681beb0792f384475077c988916762vboxsync        pThis->pSpinlock = lck_spin_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL);
05afe08870681beb0792f384475077c988916762vboxsync        if (pThis->pSpinlock)
05afe08870681beb0792f384475077c988916762vboxsync        {
05afe08870681beb0792f384475077c988916762vboxsync            *phEventSem = pThis;
05afe08870681beb0792f384475077c988916762vboxsync            return VINF_SUCCESS;
05afe08870681beb0792f384475077c988916762vboxsync        }
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync        pThis->u32Magic = 0;
05afe08870681beb0792f384475077c988916762vboxsync        RTMemFree(pThis);
05afe08870681beb0792f384475077c988916762vboxsync    }
05afe08870681beb0792f384475077c988916762vboxsync    return VERR_NO_MEMORY;
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync/**
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * Retain a reference to the semaphore.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync *
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   pThis       The semaphore.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsyncDECLINLINE(void) rtR0SemEventDarwinRetain(PRTSEMEVENTINTERNAL pThis)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    Assert(cRefs && cRefs < 100000);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync}
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync/**
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * Release a reference, destroy the thing if necessary.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync *
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   pThis       The semaphore.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsyncDECLINLINE(void) rtR0SemEventDarwinRelease(PRTSEMEVENTINTERNAL pThis)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        Assert(pThis->u32Magic != RTSEMEVENT_MAGIC);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        lck_spin_destroy(pThis->pSpinlock, g_pDarwinLockGroup);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        RTMemFree(pThis);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync}
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
05afe08870681beb0792f384475077c988916762vboxsyncRTDECL(int)  RTSemEventDestroy(RTSEMEVENT hEventSem)
05afe08870681beb0792f384475077c988916762vboxsync{
05afe08870681beb0792f384475077c988916762vboxsync    PRTSEMEVENTINTERNAL pThis = hEventSem;
05afe08870681beb0792f384475077c988916762vboxsync    if (pThis == NIL_RTSEMEVENT)
05afe08870681beb0792f384475077c988916762vboxsync        return VINF_SUCCESS;
05afe08870681beb0792f384475077c988916762vboxsync    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
05afe08870681beb0792f384475077c988916762vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
05afe08870681beb0792f384475077c988916762vboxsync    RT_ASSERT_INTS_ON();
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_lock(pThis->pSpinlock);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC); /* make the handle invalid */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    ASMAtomicWriteBool(&pThis->fSignaled, false);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /* abort waiting threads. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    PRTSEMEVENTDARWINENTRY pWaiter;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node)
05afe08870681beb0792f384475077c988916762vboxsync    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        pWaiter->fWokenUp = true;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_RESTART);
05afe08870681beb0792f384475077c988916762vboxsync    }
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    lck_spin_unlock(pThis->pSpinlock);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    rtR0SemEventDarwinRelease(pThis);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
05afe08870681beb0792f384475077c988916762vboxsync    return VINF_SUCCESS;
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsyncRTDECL(int)  RTSemEventSignal(RTSEMEVENT hEventSem)
05afe08870681beb0792f384475077c988916762vboxsync{
05afe08870681beb0792f384475077c988916762vboxsync    PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
05afe08870681beb0792f384475077c988916762vboxsync    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
05afe08870681beb0792f384475077c988916762vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC,
05afe08870681beb0792f384475077c988916762vboxsync                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
05afe08870681beb0792f384475077c988916762vboxsync                    VERR_INVALID_HANDLE);
05afe08870681beb0792f384475077c988916762vboxsync    RT_ASSERT_PREEMPT_CPUID_VAR();
05afe08870681beb0792f384475077c988916762vboxsync    RT_ASSERT_INTS_ON();
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    rtR0SemEventDarwinRetain(pThis);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
05afe08870681beb0792f384475077c988916762vboxsync    /** @todo should probably disable interrupts here... update
05afe08870681beb0792f384475077c988916762vboxsync     *        semspinmutex-r0drv-generic.c when done. */
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_lock(pThis->pSpinlock);
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     * Wake up one thread.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    ASMAtomicWriteBool(&pThis->fSignaled, true);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    PRTSEMEVENTDARWINENTRY pWaiter;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node)
05afe08870681beb0792f384475077c988916762vboxsync    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        if (!pWaiter->fWokenUp)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            pWaiter->fWokenUp = true;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_AWAKENED);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            ASMAtomicWriteBool(&pThis->fSignaled, false);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        }
05afe08870681beb0792f384475077c988916762vboxsync    }
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_unlock(pThis->pSpinlock);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    rtR0SemEventDarwinRelease(pThis);
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync    RT_ASSERT_PREEMPT_CPUID();
05afe08870681beb0792f384475077c988916762vboxsync    return VINF_SUCCESS;
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync/**
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync *
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @returns VBox status code.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   pThis           The event semaphore.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   fFlags          See RTSemEventWaitEx.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   uTimeout        See RTSemEventWaitEx.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync * @param   pSrcPos         The source code position of the wait.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsyncstatic int rtR0SemEventDarwinWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                  PCRTLOCKVALSRCPOS pSrcPos)
05afe08870681beb0792f384475077c988916762vboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     * Validate the input.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    rtR0SemEventDarwinRetain(pThis);
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_lock(pThis->pSpinlock);
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     * In the signaled state?
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync     */
05afe08870681beb0792f384475077c988916762vboxsync    int rc;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    if (ASMAtomicCmpXchgBool(&pThis->fSignaled, false, true))
05afe08870681beb0792f384475077c988916762vboxsync        rc = VINF_SUCCESS;
05afe08870681beb0792f384475077c988916762vboxsync    else
05afe08870681beb0792f384475077c988916762vboxsync    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync         * We have to wait. So, we'll need to convert the timeout and figure
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync         * out if it's indefinite or not.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync         */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        uint64_t uNsAbsTimeout = 1;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE))
05afe08870681beb0792f384475077c988916762vboxsync        {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                uTimeout = uTimeout < UINT64_MAX / UINT32_C(1000000) * UINT32_C(1000000)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                         ? uTimeout * UINT32_C(1000000)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                         : UINT64_MAX;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            if (uTimeout == UINT64_MAX)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                fFlags |= RTSEMWAIT_FLAGS_INDEFINITE;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            else
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                uint64_t u64Now;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                if (fFlags & RTSEMWAIT_FLAGS_RELATIVE)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    if (uTimeout != 0)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        u64Now = RTTimeSystemNanoTS();
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        uNsAbsTimeout = u64Now + uTimeout;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        if (uNsAbsTimeout < u64Now) /* overflow */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            fFlags |= RTSEMWAIT_FLAGS_INDEFINITE;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                else
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    uNsAbsTimeout = uTimeout;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    u64Now        = RTTimeSystemNanoTS();
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    uTimeout      = u64Now < uTimeout ? uTimeout - u64Now : 0;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        }
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        if (   !(fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            && uTimeout == 0)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync             * Poll call, we already checked the condition above so no need to
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync             * wait for anything.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync             */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            rc = VERR_TIMEOUT;
05afe08870681beb0792f384475077c988916762vboxsync        }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync        else
05afe08870681beb0792f384475077c988916762vboxsync        {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            RTSEMEVENTDARWINENTRY Waiter;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            Waiter.fWokenUp = false;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            RTListAppend(&pThis->WaitList, &Waiter.Node);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            for (;;)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                 * Do the actual waiting.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                 */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                ASMAtomicWriteBool(&pThis->fHaveBlockedThreads, true);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                wait_interrupt_t fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE ? THREAD_ABORTSAFE : THREAD_UNINT;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                wait_result_t    rcWait;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    rcWait = lck_spin_sleep(pThis->pSpinlock, LCK_SLEEP_DEFAULT, (event_t)&Waiter, fInterruptible);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                else
05afe08870681beb0792f384475077c988916762vboxsync                {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    uint64_t u64AbsTime;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    nanoseconds_to_absolutetime(uNsAbsTimeout, &u64AbsTime);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    rcWait = lck_spin_sleep_deadline(pThis->pSpinlock, LCK_SLEEP_DEFAULT,
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                                     (event_t)&Waiter, fInterruptible, u64AbsTime);
05afe08870681beb0792f384475077c988916762vboxsync                }
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                /*
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                 * Deal with the wait result.
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                 */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                if (RT_LIKELY(pThis->u32Magic == RTSEMEVENT_MAGIC))
05afe08870681beb0792f384475077c988916762vboxsync                {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    switch (rcWait)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    {
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        case THREAD_AWAKENED:
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            if (RT_LIKELY(Waiter.fWokenUp))
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                rc = VINF_SUCCESS;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            else if (fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE)
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                rc = VERR_INTERRUPTED;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            else
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                continue; /* Seen this happen after fork/exec/something. */
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        case THREAD_TIMED_OUT:
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            Assert(!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE));
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            rc = !Waiter.fWokenUp ? VERR_TIMEOUT : VINF_SUCCESS;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        case THREAD_INTERRUPTED:
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            Assert(fInterruptible != THREAD_UNINT);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            rc = !Waiter.fWokenUp ? VERR_INTERRUPTED : VINF_SUCCESS;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        case THREAD_RESTART:
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            AssertMsg(pThis->u32Magic == ~RTSEMEVENT_MAGIC, ("%#x\n", pThis->u32Magic));
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            rc = VERR_SEM_DESTROYED;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                        default:
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            AssertMsgFailed(("rcWait=%d\n", rcWait));
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            rc = VERR_INTERNAL_ERROR_3;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                            break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    }
05afe08870681beb0792f384475077c988916762vboxsync                }
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                else
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                    rc = VERR_SEM_DESTROYED;
05afe08870681beb0792f384475077c988916762vboxsync                break;
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            }
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync            RTListNodeRemove(&Waiter.Node);
05afe08870681beb0792f384475077c988916762vboxsync        }
05afe08870681beb0792f384475077c988916762vboxsync    }
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync    lck_spin_unlock(pThis->pSpinlock);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    rtR0SemEventDarwinRelease(pThis);
05afe08870681beb0792f384475077c988916762vboxsync    return rc;
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsyncRTDECL(int)  RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
05afe08870681beb0792f384475077c988916762vboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#ifndef RTSEMEVENT_STRICT
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, NULL);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#else
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos);
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync#endif
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
05afe08870681beb0792f384475077c988916762vboxsync
09776500e6fe37b0613ab81ad127c6c14639386bvboxsyncRTDECL(int)  RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync                                   RTHCUINTPTR uId, RT_SRC_POS_DECL)
05afe08870681beb0792f384475077c988916762vboxsync{
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
09776500e6fe37b0613ab81ad127c6c14639386bvboxsync    return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos);
05afe08870681beb0792f384475077c988916762vboxsync}
05afe08870681beb0792f384475077c988916762vboxsync
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsyncRTDECL(uint32_t) RTSemEventGetResolution(void)
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync{
8f9193a0c6db641a38d56ceba5747557f1e9927dvboxsync    uint64_t cNs;
8f9193a0c6db641a38d56ceba5747557f1e9927dvboxsync    absolutetime_to_nanoseconds(1, &cNs);
8f9193a0c6db641a38d56ceba5747557f1e9927dvboxsync    return (uint32_t)cNs ? (uint32_t)cNs : 0;
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync}
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync