diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/darwin/semmutex-r0drv-darwin.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/darwin/semmutex-r0drv-darwin.cpp | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/darwin/semmutex-r0drv-darwin.cpp b/src/VBox/Runtime/r0drv/darwin/semmutex-r0drv-darwin.cpp new file mode 100644 index 00000000..cfb3d04b --- /dev/null +++ b/src/VBox/Runtime/r0drv/darwin/semmutex-r0drv-darwin.cpp @@ -0,0 +1,407 @@ +/* $Id: semmutex-r0drv-darwin.cpp $ */ +/** @file + * IPRT - Mutex Semaphores, Ring-0 Driver, Darwin. + */ + +/* + * Copyright (C) 2006-2020 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. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define RTSEMMUTEX_WITHOUT_REMAPPING +#include "the-darwin-kernel.h" +#include "internal/iprt.h" +#include <iprt/semaphore.h> + +#include <iprt/asm.h> +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) +# include <iprt/asm-amd64-x86.h> +#endif +#include <iprt/assert.h> +#include <iprt/err.h> +#include <iprt/mem.h> +#include <iprt/thread.h> + +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Darwin mutex semaphore. + */ +typedef struct RTSEMMUTEXINTERNAL +{ + /** Magic value (RTSEMMUTEX_MAGIC). */ + uint32_t volatile u32Magic; + /** The number of waiting threads. */ + uint32_t cWaiters; + /** The number of references. */ + uint32_t volatile cRefs; + /** The number of recursions. */ + uint32_t cRecursions; + /** The handle of the owner thread. */ + RTNATIVETHREAD hNativeOwner; + /** The spinlock protecting us. */ + lck_spin_t *pSpinlock; +} RTSEMMUTEXINTERNAL, *PRTSEMMUTEXINTERNAL; + + + +RTDECL(int) RTSemMutexCreate(PRTSEMMUTEX phMutexSem) +{ + return RTSemMutexCreateEx(phMutexSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE, NULL); +} + + +RTDECL(int) RTSemMutexCreateEx(PRTSEMMUTEX phMutexSem, uint32_t fFlags, + RTLOCKVALCLASS hClass, uint32_t uSubClass, const char *pszNameFmt, ...) +{ + RT_NOREF(hClass, uSubClass, pszNameFmt); + AssertReturn(!(fFlags & ~RTSEMMUTEX_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER); + RT_ASSERT_PREEMPTIBLE(); + IPRT_DARWIN_SAVE_EFL_AC(); + + AssertCompile(sizeof(RTSEMMUTEXINTERNAL) > sizeof(void *)); + PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (pThis) + { + pThis->u32Magic = RTSEMMUTEX_MAGIC; + pThis->cWaiters = 0; + pThis->cRefs = 1; + pThis->cRecursions = 0; + pThis->hNativeOwner = NIL_RTNATIVETHREAD; + Assert(g_pDarwinLockGroup); + pThis->pSpinlock = lck_spin_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL); + if (pThis->pSpinlock) + { + *phMutexSem = pThis; + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; + } + + RTMemFree(pThis); + } + IPRT_DARWIN_RESTORE_EFL_AC(); + return VERR_NO_MEMORY; +} + + +/** + * Called when the refcount reaches zero. + */ +static void rtSemMutexDarwinFree(PRTSEMMUTEXINTERNAL pThis) +{ + IPRT_DARWIN_SAVE_EFL_AC(); + + lck_spin_unlock(pThis->pSpinlock); + lck_spin_destroy(pThis->pSpinlock, g_pDarwinLockGroup); + RTMemFree(pThis); + + IPRT_DARWIN_RESTORE_EFL_AC(); +} + + +RTDECL(int) RTSemMutexDestroy(RTSEMMUTEX hMutexSem) +{ + /* + * Validate input. + */ + PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)hMutexSem; + if (pThis == NIL_RTSEMMUTEX) + return VERR_INVALID_PARAMETER; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + RT_ASSERT_INTS_ON(); + IPRT_DARWIN_SAVE_EFL_AC(); + + /* + * Kill it, wake up all waiting threads and release the reference. + */ + AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTSEMMUTEX_MAGIC, RTSEMMUTEX_MAGIC), VERR_INVALID_HANDLE); + lck_spin_lock(pThis->pSpinlock); + + if (pThis->cWaiters > 0) + thread_wakeup_prim((event_t)pThis, FALSE /* one_thread */, THREAD_RESTART); + + if (ASMAtomicDecU32(&pThis->cRefs) == 0) + rtSemMutexDarwinFree(pThis); + else + lck_spin_unlock(pThis->pSpinlock); + + IPRT_DARWIN_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} + + +/** + * Internal worker for the sleep scenario. + * + * Called owning the spinlock, returns without it. + * + * @returns IPRT status code. + * @param pThis The mutex instance. + * @param cMillies The timeout. + * @param fInterruptible Whether it's interruptible + * (RTSemMutexRequestNoResume) or not + * (RTSemMutexRequest). + * @param hNativeSelf The thread handle of the caller. + */ +static int rtR0SemMutexDarwinRequestSleep(PRTSEMMUTEXINTERNAL pThis, RTMSINTERVAL cMillies, + wait_interrupt_t fInterruptible, RTNATIVETHREAD hNativeSelf) +{ + /* + * Grab a reference and indicate that we're waiting. + */ + pThis->cWaiters++; + ASMAtomicIncU32(&pThis->cRefs); + + /* + * Go to sleep, use the address of the mutex instance as sleep/blocking/event id. + */ + wait_result_t rcWait; + if (cMillies == RT_INDEFINITE_WAIT) + rcWait = lck_spin_sleep(pThis->pSpinlock, LCK_SLEEP_DEFAULT, (event_t)pThis, fInterruptible); + else + { + uint64_t u64AbsTime; + nanoseconds_to_absolutetime(cMillies * UINT64_C(1000000), &u64AbsTime); + u64AbsTime += mach_absolute_time(); + + rcWait = lck_spin_sleep_deadline(pThis->pSpinlock, LCK_SLEEP_DEFAULT, + (event_t)pThis, fInterruptible, u64AbsTime); + } + + /* + * Translate the rc. + */ + int rc; + switch (rcWait) + { + case THREAD_AWAKENED: + if (RT_LIKELY(pThis->u32Magic == RTSEMMUTEX_MAGIC)) + { + if (RT_LIKELY( pThis->cRecursions == 0 + && pThis->hNativeOwner == NIL_RTNATIVETHREAD)) + { + pThis->cRecursions = 1; + pThis->hNativeOwner = hNativeSelf; + rc = VINF_SUCCESS; + } + else + { + Assert(pThis->cRecursions == 0); + Assert(pThis->hNativeOwner == NIL_RTNATIVETHREAD); + rc = VERR_INTERNAL_ERROR_3; + } + } + else + rc = VERR_SEM_DESTROYED; + break; + + case THREAD_TIMED_OUT: + Assert(cMillies != RT_INDEFINITE_WAIT); + rc = VERR_TIMEOUT; + break; + + case THREAD_INTERRUPTED: + Assert(fInterruptible); + rc = VERR_INTERRUPTED; + break; + + case THREAD_RESTART: + Assert(pThis->u32Magic == ~RTSEMMUTEX_MAGIC); + rc = VERR_SEM_DESTROYED; + break; + + default: + AssertMsgFailed(("rcWait=%d\n", rcWait)); + rc = VERR_GENERAL_FAILURE; + break; + } + + /* + * Dereference it and quit the lock. + */ + Assert(pThis->cWaiters > 0); + pThis->cWaiters--; + + Assert(pThis->cRefs > 0); + if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0)) + rtSemMutexDarwinFree(pThis); + else + lck_spin_unlock(pThis->pSpinlock); + return rc; +} + + +/** + * Internal worker for RTSemMutexRequest and RTSemMutexRequestNoResume + * + * @returns IPRT status code. + * @param hMutexSem The mutex handle. + * @param cMillies The timeout. + * @param fInterruptible Whether it's interruptible + * (RTSemMutexRequestNoResume) or not + * (RTSemMutexRequest). + */ +DECLINLINE(int) rtR0SemMutexDarwinRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, wait_interrupt_t fInterruptible) +{ + /* + * Validate input. + */ + PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)hMutexSem; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE); + RT_ASSERT_PREEMPTIBLE(); + IPRT_DARWIN_SAVE_EFL_AC(); + + /* + * Grab the lock and check out the state. + */ + RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf(); + int rc = VINF_SUCCESS; + lck_spin_lock(pThis->pSpinlock); + + /* Recursive call? */ + if (pThis->hNativeOwner == hNativeSelf) + { + Assert(pThis->cRecursions > 0); + Assert(pThis->cRecursions < 256); + pThis->cRecursions++; + } + + /* Is it free and nobody ahead of us in the queue? */ + else if ( pThis->hNativeOwner == NIL_RTNATIVETHREAD + && pThis->cWaiters == 0) + { + pThis->hNativeOwner = hNativeSelf; + pThis->cRecursions = 1; + } + + /* Polling call? */ + else if (cMillies == 0) + rc = VERR_TIMEOUT; + + /* Yawn, time for a nap... */ + else + { + rc = rtR0SemMutexDarwinRequestSleep(pThis, cMillies, fInterruptible, hNativeSelf); + IPRT_DARWIN_RESTORE_EFL_ONLY_AC(); + return rc; + } + + lck_spin_unlock(pThis->pSpinlock); + IPRT_DARWIN_RESTORE_EFL_ONLY_AC(); + return rc; +} + + +RTDECL(int) RTSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies) +{ + return rtR0SemMutexDarwinRequest(hMutexSem, cMillies, THREAD_UNINT); +} + + +RTDECL(int) RTSemMutexRequestDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL) +{ + RT_SRC_POS_NOREF(); RT_NOREF(uId); + return RTSemMutexRequest(hMutexSem, cMillies); +} + + +RTDECL(int) RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies) +{ + return rtR0SemMutexDarwinRequest(hMutexSem, cMillies, THREAD_ABORTSAFE); +} + + +RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL) +{ + RT_SRC_POS_NOREF(); RT_NOREF(uId); + return RTSemMutexRequestNoResume(hMutexSem, cMillies); +} + + +RTDECL(int) RTSemMutexRelease(RTSEMMUTEX hMutexSem) +{ + /* + * Validate input. + */ + PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)hMutexSem; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE); + RT_ASSERT_PREEMPTIBLE(); + IPRT_DARWIN_SAVE_EFL_AC(); + + /* + * Take the lock and do the job. + */ + RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf(); + int rc = VINF_SUCCESS; + lck_spin_lock(pThis->pSpinlock); + + if (pThis->hNativeOwner == hNativeSelf) + { + Assert(pThis->cRecursions > 0); + if (--pThis->cRecursions == 0) + { + pThis->hNativeOwner = NIL_RTNATIVETHREAD; + if (pThis->cWaiters > 0) + thread_wakeup_prim((event_t)pThis, TRUE /* one_thread */, THREAD_AWAKENED); + + } + } + else + rc = VERR_NOT_OWNER; + + lck_spin_unlock(pThis->pSpinlock); + + AssertRC(rc); + IPRT_DARWIN_RESTORE_EFL_ONLY_AC(); + return VINF_SUCCESS; +} + + +RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem) +{ + /* + * Validate. + */ + RTSEMMUTEXINTERNAL *pThis = hMutexSem; + AssertPtrReturn(pThis, false); + AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, false); + IPRT_DARWIN_SAVE_EFL_AC(); + + /* + * Take the lock and do the check. + */ + lck_spin_lock(pThis->pSpinlock); + bool fRc = pThis->hNativeOwner != NIL_RTNATIVETHREAD; + lck_spin_unlock(pThis->pSpinlock); + + IPRT_DARWIN_RESTORE_EFL_AC(); + return fRc; +} + |