| 1 | /* $Id: semevent-r0drv-freebsd.c 98103 2023-01-17 14:15:46Z 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) 2007-2023 Oracle and/or its affiliates.
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| 10 | *
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| 11 | * This file is part of VirtualBox base platform packages, as
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| 12 | * available from https://www.virtualbox.org.
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| 13 | *
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| 14 | * This program is free software; you can redistribute it and/or
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| 15 | * modify it under the terms of the GNU General Public License
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| 16 | * as published by the Free Software Foundation, in version 3 of the
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| 17 | * License.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful, but
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| 20 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 22 | * General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 26 | *
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| 27 | * The contents of this file may alternatively be used under the terms
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| 28 | * of the Common Development and Distribution License Version 1.0
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| 29 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 30 | * in the VirtualBox distribution, in which case the provisions of the
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| 31 | * CDDL are applicable instead of those of the GPL.
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| 32 | *
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| 33 | * You may elect to license modified versions of this file under the
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| 34 | * terms and conditions of either the GPL or the CDDL or both.
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| 35 | *
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| 36 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 37 | * --------------------------------------------------------------------
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| 38 | *
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| 39 | * This code is based on:
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| 40 | *
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| 41 | * Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 42 | *
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| 43 | * Permission is hereby granted, free of charge, to any person
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| 44 | * obtaining a copy of this software and associated documentation
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| 45 | * files (the "Software"), to deal in the Software without
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| 46 | * restriction, including without limitation the rights to use,
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| 47 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 48 | * copies of the Software, and to permit persons to whom the
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| 49 | * Software is furnished to do so, subject to the following
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| 50 | * conditions:
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| 51 | *
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| 52 | * The above copyright notice and this permission notice shall be
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| 53 | * included in all copies or substantial portions of the Software.
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| 54 | *
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| 55 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 56 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 57 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 58 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 59 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 60 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 61 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 62 | * OTHER DEALINGS IN THE SOFTWARE.
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| 63 | */
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| 64 |
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| 65 |
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| 66 | /*********************************************************************************************************************************
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| 67 | * Header Files *
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| 68 | *********************************************************************************************************************************/
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| 69 | #define RTSEMEVENT_WITHOUT_REMAPPING
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| 70 | #include "the-freebsd-kernel.h"
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| 71 | #include "internal/iprt.h"
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| 72 | #include <iprt/semaphore.h>
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| 73 |
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| 74 | #include <iprt/asm.h>
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| 75 | #include <iprt/assert.h>
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| 76 | #include <iprt/err.h>
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| 77 | #include <iprt/lockvalidator.h>
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| 78 | #include <iprt/mem.h>
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| 79 |
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| 80 | #include "sleepqueue-r0drv-freebsd.h"
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| 81 | #include "internal/magics.h"
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| 82 |
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| 83 |
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| 84 | /*********************************************************************************************************************************
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| 85 | * Structures and Typedefs *
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| 86 | *********************************************************************************************************************************/
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| 87 | /**
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| 88 | * FreeBSD event semaphore.
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| 89 | */
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| 90 | typedef struct RTSEMEVENTINTERNAL
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| 91 | {
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| 92 | /** Magic value (RTSEMEVENT_MAGIC). */
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| 93 | uint32_t volatile u32Magic;
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| 94 | /** The object status - !0 when signaled and 0 when reset. */
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| 95 | uint32_t volatile fState;
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| 96 | /** Reference counter. */
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| 97 | uint32_t volatile cRefs;
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| 98 | } RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
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| 99 |
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| 100 |
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| 101 | RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
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| 102 | {
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| 103 | return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
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| 104 | }
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| 105 |
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| 106 |
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| 107 | RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
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| 108 | {
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| 109 | AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
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| 110 | AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
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| 111 | Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
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| 112 | AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
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| 113 |
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| 114 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAllocZ(sizeof(*pThis));
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| 115 | if (!pThis)
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| 116 | return VERR_NO_MEMORY;
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| 117 |
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| 118 | pThis->u32Magic = RTSEMEVENT_MAGIC;
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| 119 | pThis->cRefs = 1;
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| 120 | pThis->fState = 0;
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| 121 |
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| 122 | *phEventSem = pThis;
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| 123 | return VINF_SUCCESS;
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| 124 | }
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| 125 |
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| 126 |
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| 127 | /**
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| 128 | * Retains a reference to the event semaphore.
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| 129 | *
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| 130 | * @param pThis The event semaphore.
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| 131 | */
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| 132 | DECLINLINE(void) rtR0SemEventBsdRetain(PRTSEMEVENTINTERNAL pThis)
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| 133 | {
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| 134 | uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
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| 135 | Assert(cRefs < 100000); NOREF(cRefs);
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| 136 | }
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| 137 |
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| 138 |
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| 139 | /**
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| 140 | * Releases a reference to the event semaphore.
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| 141 | *
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| 142 | * @param pThis The event semaphore.
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| 143 | */
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| 144 | DECLINLINE(void) rtR0SemEventBsdRelease(PRTSEMEVENTINTERNAL pThis)
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| 145 | {
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| 146 | if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
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| 147 | RTMemFree(pThis);
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| 148 | }
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| 149 |
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| 150 |
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| 151 | RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
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| 152 | {
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| 153 | /*
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| 154 | * Validate input.
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| 155 | */
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| 156 | PRTSEMEVENTINTERNAL pThis = hEventSem;
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| 157 | if (pThis == NIL_RTSEMEVENT)
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| 158 | return VINF_SUCCESS;
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| 159 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 160 | Assert(pThis->cRefs > 0);
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| 161 |
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| 162 | /*
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| 163 | * Invalidate it and signal the object just in case.
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| 164 | */
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| 165 | ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
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| 166 | ASMAtomicWriteU32(&pThis->fState, 0);
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| 167 | rtR0SemBsdBroadcast(pThis);
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| 168 | rtR0SemEventBsdRelease(pThis);
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| 169 | return VINF_SUCCESS;
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| 170 | }
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| 171 |
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| 172 |
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| 173 | RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
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| 174 | {
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| 175 | /*
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| 176 | * Validate input.
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| 177 | */
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| 178 | PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
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| 179 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 180 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
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| 181 | rtR0SemEventBsdRetain(pThis);
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| 182 |
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| 183 | /*
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| 184 | * Signal the event object.
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| 185 | */
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| 186 | ASMAtomicWriteU32(&pThis->fState, 1);
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| 187 | rtR0SemBsdSignal(pThis);
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| 188 | rtR0SemEventBsdRelease(pThis);
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| 189 | return VINF_SUCCESS;
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| 190 | }
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| 191 |
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| 192 | /**
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| 193 | * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
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| 194 | *
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| 195 | * @returns VBox status code.
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| 196 | * @param pThis The event semaphore.
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| 197 | * @param fFlags See RTSemEventWaitEx.
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| 198 | * @param uTimeout See RTSemEventWaitEx.
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| 199 | * @param pSrcPos The source code position of the wait.
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| 200 | */
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| 201 | static int rtR0SemEventWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
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| 202 | PCRTLOCKVALSRCPOS pSrcPos)
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| 203 | {
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| 204 | int rc;
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| 205 |
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| 206 | /*
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| 207 | * Validate the input.
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| 208 | */
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| 209 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 210 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
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| 211 | AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
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| 212 | rtR0SemEventBsdRetain(pThis);
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| 213 |
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| 214 | /*
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| 215 | * Try grab the event without setting up the wait.
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| 216 | */
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| 217 | if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
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| 218 | rc = VINF_SUCCESS;
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| 219 | else
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| 220 | {
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| 221 | /*
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| 222 | * We have to wait.
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| 223 | */
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| 224 | RTR0SEMBSDSLEEP Wait;
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| 225 | rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
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| 226 | if (RT_SUCCESS(rc))
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| 227 | {
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| 228 | for (;;)
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| 229 | {
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| 230 | /* The destruction test. */
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| 231 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
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| 232 | rc = VERR_SEM_DESTROYED;
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| 233 | else
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| 234 | {
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| 235 | rtR0SemBsdWaitPrepare(&Wait);
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| 236 |
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| 237 | /* Check the exit conditions. */
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| 238 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
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| 239 | rc = VERR_SEM_DESTROYED;
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| 240 | else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
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| 241 | rc = VINF_SUCCESS;
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| 242 | else if (rtR0SemBsdWaitHasTimedOut(&Wait))
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| 243 | rc = VERR_TIMEOUT;
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| 244 | else if (rtR0SemBsdWaitWasInterrupted(&Wait))
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| 245 | rc = VERR_INTERRUPTED;
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| 246 | else
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| 247 | {
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| 248 | /* Do the wait and then recheck the conditions. */
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| 249 | rtR0SemBsdWaitDoIt(&Wait);
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| 250 | continue;
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| 251 | }
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| 252 | }
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| 253 | break;
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| 254 | }
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| 255 |
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| 256 | rtR0SemBsdWaitDelete(&Wait);
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| 257 | }
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| 258 | }
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| 259 |
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| 260 | rtR0SemEventBsdRelease(pThis);
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| 261 | return rc;
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| 262 | }
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| 263 |
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| 264 |
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| 265 | RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
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| 266 | {
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| 267 | #ifndef RTSEMEVENT_STRICT
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| 268 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, NULL);
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| 269 | #else
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| 270 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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| 271 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 272 | #endif
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| 273 | }
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| 274 | RT_EXPORT_SYMBOL(RTSemEventWaitEx);
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| 275 |
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| 276 |
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| 277 | RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
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| 278 | RTHCUINTPTR uId, RT_SRC_POS_DECL)
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| 279 | {
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| 280 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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| 281 | return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
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| 282 | }
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| 283 | RT_EXPORT_SYMBOL(RTSemEventWaitExDebug);
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| 284 |
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| 285 |
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| 286 | RTDECL(uint32_t) RTSemEventGetResolution(void)
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| 287 | {
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| 288 | return 1000000000 / hz;
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| 289 | }
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| 290 |
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| 291 |
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| 292 | RTR0DECL(bool) RTSemEventIsSignalSafe(void)
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| 293 | {
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| 294 | /** @todo check the code... */
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| 295 | return false;
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| 296 | }
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| 297 |
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