diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp b/src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp new file mode 100644 index 00000000..2a542327 --- /dev/null +++ b/src/VBox/Runtime/r0drv/darwin/semevent-r0drv-darwin.cpp @@ -0,0 +1,427 @@ +/* $Id: semevent-r0drv-darwin.cpp $ */ +/** @file + * IPRT - Single Release Event Semaphores, Ring-0 Driver, Darwin. + */ + +/* + * Copyright (C) 2006-2019 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. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define RTSEMEVENT_WITHOUT_REMAPPING +#include "the-darwin-kernel.h" +#include "internal/iprt.h" +#include <iprt/semaphore.h> + +#include <iprt/assert.h> +#include <iprt/asm.h> +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) +# include <iprt/asm-amd64-x86.h> +#endif +#include <iprt/err.h> +#include <iprt/list.h> +#include <iprt/lockvalidator.h> +#include <iprt/mem.h> +#include <iprt/mp.h> +#include <iprt/thread.h> +#include <iprt/time.h> + +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Waiter entry. Lives on the stack. + */ +typedef struct RTSEMEVENTDARWINENTRY +{ + /** The list node. */ + RTLISTNODE Node; + /** Flag set when waking up the thread by signal or destroy. */ + bool volatile fWokenUp; +} RTSEMEVENTDARWINENTRY; +/** Pointer to waiter entry. */ +typedef RTSEMEVENTDARWINENTRY *PRTSEMEVENTDARWINENTRY; + + +/** + * Darwin event semaphore. + */ +typedef struct RTSEMEVENTINTERNAL +{ + /** Magic value (RTSEMEVENT_MAGIC). */ + uint32_t volatile u32Magic; + /** Reference counter. */ + uint32_t volatile cRefs; + /** Set if there are blocked threads. */ + bool volatile fHaveBlockedThreads; + /** Set if the event object is signaled. */ + bool volatile fSignaled; + /** List of waiting and woken up threads. */ + RTLISTANCHOR WaitList; + /** The spinlock protecting us. */ + lck_spin_t *pSpinlock; +} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL; + + + +RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem) +{ + return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL); +} + + +RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...) +{ + RT_NOREF(hClass, pszNameFmt); + AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *)); + AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER); + Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL)); + AssertPtrReturn(phEventSem, VERR_INVALID_POINTER); + RT_ASSERT_PREEMPTIBLE(); + IPRT_DARWIN_SAVE_EFL_AC(); + + PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (pThis) + { + pThis->u32Magic = RTSEMEVENT_MAGIC; + pThis->cRefs = 1; + pThis->fHaveBlockedThreads = false; + pThis->fSignaled = false; + RTListInit(&pThis->WaitList); + Assert(g_pDarwinLockGroup); + pThis->pSpinlock = lck_spin_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL); + if (pThis->pSpinlock) + { + *phEventSem = pThis; + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; + } + + pThis->u32Magic = 0; + RTMemFree(pThis); + } + IPRT_DARWIN_RESTORE_EFL_AC(); + return VERR_NO_MEMORY; +} + + +/** + * Retain a reference to the semaphore. + * + * @param pThis The semaphore. + */ +DECLINLINE(void) rtR0SemEventDarwinRetain(PRTSEMEVENTINTERNAL pThis) +{ + uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs); + Assert(cRefs && cRefs < 100000); RT_NOREF_PV(cRefs); +} + + +/** + * Release a reference, destroy the thing if necessary. + * + * @param pThis The semaphore. + */ +DECLINLINE(void) rtR0SemEventDarwinRelease(PRTSEMEVENTINTERNAL pThis) +{ + if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0)) + { + Assert(pThis->u32Magic != RTSEMEVENT_MAGIC); + IPRT_DARWIN_SAVE_EFL_AC(); + + lck_spin_destroy(pThis->pSpinlock, g_pDarwinLockGroup); + RTMemFree(pThis); + + IPRT_DARWIN_RESTORE_EFL_AC(); + } +} + +RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem) +{ + PRTSEMEVENTINTERNAL pThis = hEventSem; + if (pThis == NIL_RTSEMEVENT) + return VINF_SUCCESS; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE); + RT_ASSERT_INTS_ON(); + IPRT_DARWIN_SAVE_EFL_AC(); + + RTCCUINTREG const fIntSaved = ASMIntDisableFlags(); + lck_spin_lock(pThis->pSpinlock); + + ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC); /* make the handle invalid */ + ASMAtomicWriteBool(&pThis->fSignaled, false); + + /* abort waiting threads. */ + PRTSEMEVENTDARWINENTRY pWaiter; + RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node) + { + pWaiter->fWokenUp = true; + thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_RESTART); + } + + lck_spin_unlock(pThis->pSpinlock); + ASMSetFlags(fIntSaved); + rtR0SemEventDarwinRelease(pThis); + + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} + + +RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem) +{ + PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, + ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), + VERR_INVALID_HANDLE); + RT_ASSERT_PREEMPT_CPUID_VAR(); + + /* + * Coming here with interrupts disabled should be okay. The thread_wakeup_prim KPI is used + * by the interrupt handler IOFilterInterruptEventSource::disableInterruptOccurred() via + * signalWorkAvailable(). The only problem is if we have to destroy the event structure, + * as RTMemFree does not work with interrupts disabled (IOFree/kfree takes zone mutex). + */ + //RT_ASSERT_INTS_ON(); - we may be called from interrupt context, which seems to be perfectly fine. + IPRT_DARWIN_SAVE_EFL_AC(); + + RTCCUINTREG const fIntSaved = ASMIntDisableFlags(); + rtR0SemEventDarwinRetain(pThis); + lck_spin_lock(pThis->pSpinlock); + + /* + * Wake up one thread. + */ + ASMAtomicWriteBool(&pThis->fSignaled, true); + + PRTSEMEVENTDARWINENTRY pWaiter; + RTListForEach(&pThis->WaitList, pWaiter, RTSEMEVENTDARWINENTRY, Node) + { + if (!pWaiter->fWokenUp) + { + pWaiter->fWokenUp = true; + thread_wakeup_prim((event_t)pWaiter, FALSE /* all threads */, THREAD_AWAKENED); + ASMAtomicWriteBool(&pThis->fSignaled, false); + break; + } + } + + lck_spin_unlock(pThis->pSpinlock); + ASMSetFlags(fIntSaved); + rtR0SemEventDarwinRelease(pThis); + + RT_ASSERT_PREEMPT_CPUID(); + AssertMsg((fSavedEfl & X86_EFL_IF) == (ASMGetFlags() & X86_EFL_IF), ("fSavedEfl=%#x cur=%#x\n",(uint32_t)fSavedEfl, ASMGetFlags())); + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} + + +/** + * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug. + * + * @returns VBox status code. + * @param pThis The event semaphore. + * @param fFlags See RTSemEventWaitEx. + * @param uTimeout See RTSemEventWaitEx. + * @param pSrcPos The source code position of the wait. + */ +static int rtR0SemEventDarwinWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout, + PCRTLOCKVALSRCPOS pSrcPos) +{ + RT_NOREF(pSrcPos); + + /* + * Validate the input. + */ + AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER); + AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER); + IPRT_DARWIN_SAVE_EFL_AC(); + + RTCCUINTREG const fIntSaved = ASMIntDisableFlags(); + rtR0SemEventDarwinRetain(pThis); + lck_spin_lock(pThis->pSpinlock); + + /* + * In the signaled state? + */ + int rc; + if (ASMAtomicCmpXchgBool(&pThis->fSignaled, false, true)) + rc = VINF_SUCCESS; + else + { + /* + * We have to wait. So, we'll need to convert the timeout and figure + * out if it's indefinite or not. + */ + uint64_t uNsAbsTimeout = 1; + if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE)) + { + if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) + uTimeout = uTimeout < UINT64_MAX / UINT32_C(1000000) * UINT32_C(1000000) + ? uTimeout * UINT32_C(1000000) + : UINT64_MAX; + if (uTimeout == UINT64_MAX) + fFlags |= RTSEMWAIT_FLAGS_INDEFINITE; + else + { + uint64_t u64Now; + if (fFlags & RTSEMWAIT_FLAGS_RELATIVE) + { + if (uTimeout != 0) + { + u64Now = RTTimeSystemNanoTS(); + uNsAbsTimeout = u64Now + uTimeout; + if (uNsAbsTimeout < u64Now) /* overflow */ + fFlags |= RTSEMWAIT_FLAGS_INDEFINITE; + } + } + else + { + uNsAbsTimeout = uTimeout; + u64Now = RTTimeSystemNanoTS(); + uTimeout = u64Now < uTimeout ? uTimeout - u64Now : 0; + } + } + } + + if ( !(fFlags & RTSEMWAIT_FLAGS_INDEFINITE) + && uTimeout == 0) + { + /* + * Poll call, we already checked the condition above so no need to + * wait for anything. + */ + rc = VERR_TIMEOUT; + } + else + { + RTSEMEVENTDARWINENTRY Waiter; + Waiter.fWokenUp = false; + RTListAppend(&pThis->WaitList, &Waiter.Node); + + for (;;) + { + /* + * Do the actual waiting. + */ + ASMAtomicWriteBool(&pThis->fHaveBlockedThreads, true); + wait_interrupt_t fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE ? THREAD_ABORTSAFE : THREAD_UNINT; + wait_result_t rcWait; + if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE) + rcWait = lck_spin_sleep(pThis->pSpinlock, LCK_SLEEP_DEFAULT, (event_t)&Waiter, fInterruptible); + else + { + uint64_t u64AbsTime; + nanoseconds_to_absolutetime(uNsAbsTimeout, &u64AbsTime); + rcWait = lck_spin_sleep_deadline(pThis->pSpinlock, LCK_SLEEP_DEFAULT, + (event_t)&Waiter, fInterruptible, u64AbsTime); + } + + /* + * Deal with the wait result. + */ + if (RT_LIKELY(pThis->u32Magic == RTSEMEVENT_MAGIC)) + { + switch (rcWait) + { + case THREAD_AWAKENED: + if (RT_LIKELY(Waiter.fWokenUp)) + rc = VINF_SUCCESS; + else if (fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE) + rc = VERR_INTERRUPTED; + else + continue; /* Seen this happen after fork/exec/something. */ + break; + + case THREAD_TIMED_OUT: + Assert(!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE)); + rc = !Waiter.fWokenUp ? VERR_TIMEOUT : VINF_SUCCESS; + break; + + case THREAD_INTERRUPTED: + Assert(fInterruptible != THREAD_UNINT); + rc = !Waiter.fWokenUp ? VERR_INTERRUPTED : VINF_SUCCESS; + break; + + case THREAD_RESTART: + AssertMsg(pThis->u32Magic == ~RTSEMEVENT_MAGIC, ("%#x\n", pThis->u32Magic)); + rc = VERR_SEM_DESTROYED; + break; + + default: + AssertMsgFailed(("rcWait=%d\n", rcWait)); + rc = VERR_INTERNAL_ERROR_3; + break; + } + } + else + rc = VERR_SEM_DESTROYED; + break; + } + + RTListNodeRemove(&Waiter.Node); + } + } + + lck_spin_unlock(pThis->pSpinlock); + ASMSetFlags(fIntSaved); + rtR0SemEventDarwinRelease(pThis); + + IPRT_DARWIN_RESTORE_EFL_AC(); + return rc; +} + + +RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout) +{ +#ifndef RTSEMEVENT_STRICT + return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, NULL); +#else + RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API(); + return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos); +#endif +} + + +RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout, + RTHCUINTPTR uId, RT_SRC_POS_DECL) +{ + RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API(); + return rtR0SemEventDarwinWait(hEventSem, fFlags, uTimeout, &SrcPos); +} + + +RTDECL(uint32_t) RTSemEventGetResolution(void) +{ + uint64_t cNs; + absolutetime_to_nanoseconds(1, &cNs); + return (uint32_t)cNs ? (uint32_t)cNs : 0; +} + |