| 1 | /* $Id: semevent-r0drv-freebsd.c 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Single Release Event Semaphores, Ring-0 Driver, FreeBSD.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Contributed by knut st. osmundsen.
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| 8 | *
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| 9 | * Copyright (C) 2007-2022 Oracle Corporation
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | *
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| 19 | * The contents of this file may alternatively be used under the terms
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| 20 | * of the Common Development and Distribution License Version 1.0
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| 21 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 22 | * VirtualBox OSE distribution, in which case the provisions of the
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| 23 | * CDDL are applicable instead of those of the GPL.
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| 24 | *
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| 25 | * You may elect to license modified versions of this file under the
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| 26 | * terms and conditions of either the GPL or the CDDL or both.
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| 27 | * --------------------------------------------------------------------
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| 28 | *
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| 29 | * This code is based on:
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| 30 | *
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| 31 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 32 | *
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| 33 | * Permission is hereby granted, free of charge, to any person
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| 34 | * obtaining a copy of this software and associated documentation
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| 35 | * files (the "Software"), to deal in the Software without
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| 36 | * restriction, including without limitation the rights to use,
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| 37 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 38 | * copies of the Software, and to permit persons to whom the
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| 39 | * Software is furnished to do so, subject to the following
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| 40 | * conditions:
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| 41 | *
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| 42 | * The above copyright notice and this permission notice shall be
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| 43 | * included in all copies or substantial portions of the Software.
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| 44 | *
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| 45 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 46 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 47 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 48 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 49 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 50 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 51 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 52 | * OTHER DEALINGS IN THE SOFTWARE.
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| 53 | */
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| 54 |
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| 55 |
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| 56 | /*********************************************************************************************************************************
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| 57 | * Header Files *
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| 58 | *********************************************************************************************************************************/
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| 59 | #define RTSEMEVENT_WITHOUT_REMAPPING
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| 60 | #include "the-freebsd-kernel.h"
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| 61 | #include "internal/iprt.h"
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| 62 | #include <iprt/semaphore.h>
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| 63 |
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| 64 | #include <iprt/asm.h>
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| 65 | #include <iprt/assert.h>
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| 66 | #include <iprt/err.h>
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| 67 | #include <iprt/lockvalidator.h>
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| 68 | #include <iprt/mem.h>
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| 69 |
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| 70 | #include "sleepqueue-r0drv-freebsd.h"
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| 71 | #include "internal/magics.h"
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| 72 |
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| 73 |
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| 74 | /*********************************************************************************************************************************
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| 75 | * Structures and Typedefs *
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| 76 | *********************************************************************************************************************************/
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| 77 | /**
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| 78 | * FreeBSD event semaphore.
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| 79 | */
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| 80 | typedef struct RTSEMEVENTINTERNAL
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| 81 | {
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| 82 | /** Magic value (RTSEMEVENT_MAGIC). */
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| 83 | uint32_t volatile u32Magic;
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| 84 | /** The object status - !0 when signaled and 0 when reset. */
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| 85 | uint32_t volatile fState;
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| 86 | /** Reference counter. */
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| 87 | uint32_t volatile cRefs;
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| 88 | } RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
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| 89 |
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| 90 |
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| 91 | RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
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| 92 | {
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| 93 | return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
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| 94 | }
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| 95 |
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| 96 |
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| 97 | RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
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| 98 | {
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| 99 | AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
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| 100 | AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
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| 101 | Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
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| 102 | AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
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| 103 |
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| 104 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAllocZ(sizeof(*pThis));
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| 105 | if (!pThis)
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| 106 | return VERR_NO_MEMORY;
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| 107 |
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| 108 | pThis->u32Magic = RTSEMEVENT_MAGIC;
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| 109 | pThis->cRefs = 1;
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| 110 | pThis->fState = 0;
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| 111 |
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| 112 | *phEventSem = pThis;
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| 113 | return VINF_SUCCESS;
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| 114 | }
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| 115 |
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| 116 |
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| 117 | /**
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| 118 | * Retains a reference to the event semaphore.
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| 119 | *
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| 120 | * @param pThis The event semaphore.
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| 121 | */
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| 122 | DECLINLINE(void) rtR0SemEventBsdRetain(PRTSEMEVENTINTERNAL pThis)
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| 123 | {
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| 124 | uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
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| 125 | Assert(cRefs < 100000); NOREF(cRefs);
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| 126 | }
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| 127 |
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| 128 |
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| 129 | /**
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| 130 | * Releases a reference to the event semaphore.
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| 131 | *
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| 132 | * @param pThis The event semaphore.
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| 133 | */
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| 134 | DECLINLINE(void) rtR0SemEventBsdRelease(PRTSEMEVENTINTERNAL pThis)
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| 135 | {
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| 136 | if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
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| 137 | RTMemFree(pThis);
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| 138 | }
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| 139 |
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| 140 |
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| 141 | RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
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| 142 | {
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| 143 | /*
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| 144 | * Validate input.
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| 145 | */
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| 146 | PRTSEMEVENTINTERNAL pThis = hEventSem;
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| 147 | if (pThis == NIL_RTSEMEVENT)
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| 148 | return VINF_SUCCESS;
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| 149 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 150 | Assert(pThis->cRefs > 0);
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| 151 |
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| 152 | /*
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| 153 | * Invalidate it and signal the object just in case.
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| 154 | */
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| 155 | ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
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| 156 | ASMAtomicWriteU32(&pThis->fState, 0);
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| 157 | rtR0SemBsdBroadcast(pThis);
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| 158 | rtR0SemEventBsdRelease(pThis);
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| 159 | return VINF_SUCCESS;
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| 160 | }
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| 161 |
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| 162 |
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| 163 | RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
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| 164 | {
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| 165 | /*
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| 166 | * Validate input.
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| 167 | */
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| 168 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
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| 169 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 170 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 171 | rtR0SemEventBsdRetain(pThis);
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| 172 |
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| 173 | /*
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| 174 | * Signal the event object.
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| 175 | */
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| 176 | ASMAtomicWriteU32(&pThis->fState, 1);
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| 177 | rtR0SemBsdSignal(pThis);
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| 178 | rtR0SemEventBsdRelease(pThis);
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| 179 | return VINF_SUCCESS;
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| 180 | }
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| 181 |
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| 182 | /**
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| 183 | * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
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| 184 | *
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| 185 | * @returns VBox status code.
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| 186 | * @param pThis The event semaphore.
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| 187 | * @param fFlags See RTSemEventWaitEx.
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| 188 | * @param uTimeout See RTSemEventWaitEx.
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| 189 | * @param pSrcPos The source code position of the wait.
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| 190 | */
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| 191 | static int rtR0SemEventWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
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| 192 | PCRTLOCKVALSRCPOS pSrcPos)
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| 193 | {
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| 194 | int rc;
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| 195 |
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| 196 | /*
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| 197 | * Validate the input.
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| 198 | */
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| 199 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 200 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
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| 201 | AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
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| 202 | rtR0SemEventBsdRetain(pThis);
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| 203 |
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| 204 | /*
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| 205 | * Try grab the event without setting up the wait.
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| 206 | */
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| 207 | if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
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| 208 | rc = VINF_SUCCESS;
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| 209 | else
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| 210 | {
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| 211 | /*
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| 212 | * We have to wait.
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| 213 | */
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| 214 | RTR0SEMBSDSLEEP Wait;
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| 215 | rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
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| 216 | if (RT_SUCCESS(rc))
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| 217 | {
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| 218 | for (;;)
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| 219 | {
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| 220 | /* The destruction test. */
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| 221 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
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| 222 | rc = VERR_SEM_DESTROYED;
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| 223 | else
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| 224 | {
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| 225 | rtR0SemBsdWaitPrepare(&Wait);
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| 226 |
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| 227 | /* Check the exit conditions. */
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| 228 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
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| 229 | rc = VERR_SEM_DESTROYED;
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| 230 | else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
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| 231 | rc = VINF_SUCCESS;
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| 232 | else if (rtR0SemBsdWaitHasTimedOut(&Wait))
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| 233 | rc = VERR_TIMEOUT;
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| 234 | else if (rtR0SemBsdWaitWasInterrupted(&Wait))
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| 235 | rc = VERR_INTERRUPTED;
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| 236 | else
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| 237 | {
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| 238 | /* Do the wait and then recheck the conditions. */
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| 239 | rtR0SemBsdWaitDoIt(&Wait);
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| 240 | continue;
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| 241 | }
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| 242 | }
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| 243 | break;
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| 244 | }
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| 245 |
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| 246 | rtR0SemBsdWaitDelete(&Wait);
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| 247 | }
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| 248 | }
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| 249 |
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| 250 | rtR0SemEventBsdRelease(pThis);
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| 251 | return rc;
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| 252 | }
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| 253 |
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| 254 |
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| 255 | RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
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| 256 | {
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| 257 | #ifndef RTSEMEVENT_STRICT
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| 258 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, NULL);
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| 259 | #else
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| 260 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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| 261 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 262 | #endif
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| 263 | }
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| 264 | RT_EXPORT_SYMBOL(RTSemEventWaitEx);
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| 265 |
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| 266 |
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| 267 | RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
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| 268 | RTHCUINTPTR uId, RT_SRC_POS_DECL)
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| 269 | {
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| 270 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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| 271 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 272 | }
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| 273 | RT_EXPORT_SYMBOL(RTSemEventWaitExDebug);
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| 274 |
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| 275 |
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| 276 | RTDECL(uint32_t) RTSemEventGetResolution(void)
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| 277 | {
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| 278 | return 1000000000 / hz;
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| 279 | }
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| 280 |
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| 281 |
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| 282 | RTR0DECL(bool) RTSemEventIsSignalSafe(void)
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| 283 | {
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| 284 | /** @todo check the code... */
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| 285 | return false;
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| 286 | }
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| 287 |
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