[1] | 1 | /* $Id: semmutex-posix.cpp 103141 2024-01-31 15:03:29Z vboxsync $ */
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| 2 | /** @file
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[8245] | 3 | * IPRT - Mutex Semaphore, POSIX.
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[1] | 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[1] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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[5999] | 11 | *
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[96407] | 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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[5999] | 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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[96407] | 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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[5999] | 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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[96407] | 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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[1] | 35 | */
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| 36 |
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[57358] | 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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[1] | 41 | #include <iprt/semaphore.h>
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[25373] | 42 | #include "internal/iprt.h"
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| 43 |
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[1] | 44 | #include <iprt/alloc.h>
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| 45 | #include <iprt/asm.h>
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[25373] | 46 | #include <iprt/assert.h>
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[1] | 47 | #include <iprt/err.h>
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[25373] | 48 | #include <iprt/lockvalidator.h>
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| 49 | #include <iprt/thread.h>
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| 50 | #include "internal/magics.h"
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[8651] | 51 | #include "internal/strict.h"
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[1] | 52 |
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| 53 | #include <errno.h>
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| 54 | #include <pthread.h>
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| 55 | #include <unistd.h>
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| 56 | #include <sys/time.h>
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| 57 |
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| 58 |
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[57358] | 59 | /*********************************************************************************************************************************
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| 60 | * Structures and Typedefs *
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| 61 | *********************************************************************************************************************************/
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[1] | 62 | /** Posix internal representation of a Mutex semaphore. */
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| 63 | struct RTSEMMUTEXINTERNAL
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| 64 | {
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| 65 | /** pthread mutex. */
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| 66 | pthread_mutex_t Mutex;
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| 67 | /** The owner of the mutex. */
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| 68 | volatile pthread_t Owner;
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| 69 | /** Nesting count. */
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| 70 | volatile uint32_t cNesting;
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[25373] | 71 | /** Magic value (RTSEMMUTEX_MAGIC). */
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| 72 | uint32_t u32Magic;
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| 73 | #ifdef RTSEMMUTEX_STRICT
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| 74 | /** Lock validator record associated with this mutex. */
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[25607] | 75 | RTLOCKVALRECEXCL ValidatorRec;
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[25373] | 76 | #endif
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[1] | 77 | };
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| 78 |
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[63004] | 79 | #if defined(RT_OS_DARWIN) || defined(RT_OS_NETBSD)
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[43558] | 80 | /**
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[63052] | 81 | * This function is a crude approximation of pthread_mutex_timedlock.
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[43558] | 82 | */
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[103141] | 83 | static int rtSemFallbackPthreadMutexTimedlock(pthread_mutex_t *mutex, RTMSINTERVAL cMillies)
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[43558] | 84 | {
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[63052] | 85 | struct timespec ts;
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| 86 | int rc;
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| 87 |
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| 88 | rc = pthread_mutex_trylock(mutex);
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| 89 | if (rc != EBUSY)
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| 90 | return rc;
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| 91 |
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| 92 | ts.tv_sec = cMillies / 1000;
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| 93 | ts.tv_nsec = (cMillies % 1000) * 1000000;
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| 94 |
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| 95 | while (ts.tv_sec > 0 || ts.tv_nsec > 0)
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[43558] | 96 | {
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[63052] | 97 | struct timespec delta, remaining;
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| 98 |
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| 99 | if (ts.tv_sec > 0)
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[43558] | 100 | {
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[63052] | 101 | delta.tv_sec = 1;
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| 102 | delta.tv_nsec = 0;
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| 103 | ts.tv_sec--;
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| 104 | }
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| 105 | else
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| 106 | {
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| 107 | delta.tv_sec = 0;
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| 108 | delta.tv_nsec = ts.tv_nsec;
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| 109 | ts.tv_nsec = 0;
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| 110 | }
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[63549] | 111 |
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[63052] | 112 | nanosleep(&delta, &remaining);
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[1] | 113 |
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[63052] | 114 | rc = pthread_mutex_trylock(mutex);
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| 115 | if (rc != EBUSY)
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| 116 | return rc;
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[43560] | 117 |
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[63052] | 118 | if (RT_UNLIKELY(remaining.tv_nsec > 0 || remaining.tv_sec > 0))
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| 119 | {
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| 120 | ts.tv_sec += remaining.tv_sec;
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| 121 | ts.tv_nsec += remaining.tv_nsec;
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| 122 | if (ts.tv_nsec >= 1000000000)
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[43560] | 123 | {
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[63052] | 124 | ts.tv_nsec -= 1000000000;
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| 125 | ts.tv_sec++;
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[43560] | 126 | }
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[63052] | 127 | }
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| 128 | }
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[43560] | 129 |
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[63052] | 130 | return ETIMEDOUT;
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[43558] | 131 | }
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| 132 | #endif
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| 133 |
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| 134 |
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[25711] | 135 | #undef RTSemMutexCreate
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| 136 | RTDECL(int) RTSemMutexCreate(PRTSEMMUTEX phMutexSem)
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| 137 | {
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| 138 | return RTSemMutexCreateEx(phMutexSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_NONE, NULL);
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| 139 | }
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[1] | 140 |
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[25378] | 141 |
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[25711] | 142 | RTDECL(int) RTSemMutexCreateEx(PRTSEMMUTEX phMutexSem, uint32_t fFlags,
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| 143 | RTLOCKVALCLASS hClass, uint32_t uSubClass, const char *pszNameFmt, ...)
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[1] | 144 | {
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[25711] | 145 | AssertReturn(!(fFlags & ~RTSEMMUTEX_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
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[1] | 146 |
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| 147 | /*
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| 148 | * Allocate semaphore handle.
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| 149 | */
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[25711] | 150 | int rc;
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[25373] | 151 | struct RTSEMMUTEXINTERNAL *pThis = (struct RTSEMMUTEXINTERNAL *)RTMemAlloc(sizeof(struct RTSEMMUTEXINTERNAL));
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| 152 | if (pThis)
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[1] | 153 | {
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| 154 | /*
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| 155 | * Create the semaphore.
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| 156 | */
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[61751] | 157 | rc = pthread_mutex_init(&pThis->Mutex, NULL);
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[1] | 158 | if (!rc)
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| 159 | {
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[61751] | 160 | pThis->Owner = (pthread_t)-1;
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| 161 | pThis->cNesting = 0;
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| 162 | pThis->u32Magic = RTSEMMUTEX_MAGIC;
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| 163 | #ifdef RTSEMMUTEX_STRICT
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| 164 | if (!pszNameFmt)
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[1] | 165 | {
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[61751] | 166 | static uint32_t volatile s_iMutexAnon = 0;
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| 167 | RTLockValidatorRecExclInit(&pThis->ValidatorRec, hClass, uSubClass, pThis,
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| 168 | !(fFlags & RTSEMMUTEX_FLAGS_NO_LOCK_VAL),
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| 169 | "RTSemMutex-%u", ASMAtomicIncU32(&s_iMutexAnon) - 1);
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| 170 | }
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| 171 | else
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| 172 | {
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| 173 | va_list va;
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| 174 | va_start(va, pszNameFmt);
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| 175 | RTLockValidatorRecExclInitV(&pThis->ValidatorRec, hClass, uSubClass, pThis,
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| 176 | !(fFlags & RTSEMMUTEX_FLAGS_NO_LOCK_VAL), pszNameFmt, va);
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| 177 | va_end(va);
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| 178 | }
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[62564] | 179 | #else
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| 180 | RT_NOREF_PV(hClass); RT_NOREF_PV(uSubClass); RT_NOREF_PV(pszNameFmt);
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[25373] | 181 | #endif
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[1] | 182 |
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[61751] | 183 | *phMutexSem = pThis;
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| 184 | return VINF_SUCCESS;
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[1] | 185 | }
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[25373] | 186 | RTMemFree(pThis);
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[1] | 187 | }
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| 188 | else
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| 189 | rc = VERR_NO_MEMORY;
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| 190 |
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| 191 | return rc;
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| 192 | }
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| 193 |
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| 194 |
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[25721] | 195 | RTDECL(int) RTSemMutexDestroy(RTSEMMUTEX hMutexSem)
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[1] | 196 | {
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| 197 | /*
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| 198 | * Validate input.
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| 199 | */
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[25721] | 200 | if (hMutexSem == NIL_RTSEMMUTEX)
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[25373] | 201 | return VINF_SUCCESS;
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[25721] | 202 | struct RTSEMMUTEXINTERNAL *pThis = hMutexSem;
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[25373] | 203 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 204 | AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
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[1] | 205 |
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| 206 | /*
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| 207 | * Try destroy it.
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| 208 | */
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[25373] | 209 | int rc = pthread_mutex_destroy(&pThis->Mutex);
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[1] | 210 | if (rc)
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| 211 | {
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[25721] | 212 | AssertMsgFailed(("Failed to destroy mutex sem %p, rc=%d.\n", hMutexSem, rc));
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[1] | 213 | return RTErrConvertFromErrno(rc);
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| 214 | }
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| 215 |
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| 216 | /*
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| 217 | * Free the memory and be gone.
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| 218 | */
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[25373] | 219 | ASMAtomicWriteU32(&pThis->u32Magic, RTSEMMUTEX_MAGIC_DEAD);
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| 220 | pThis->Owner = (pthread_t)-1;
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| 221 | pThis->cNesting = UINT32_MAX;
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| 222 | #ifdef RTSEMMUTEX_STRICT
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[25607] | 223 | RTLockValidatorRecExclDelete(&pThis->ValidatorRec);
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[25373] | 224 | #endif
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| 225 | RTMemTmpFree(pThis);
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[1] | 226 |
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| 227 | return VINF_SUCCESS;
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| 228 | }
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| 229 |
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| 230 |
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[25711] | 231 | RTDECL(uint32_t) RTSemMutexSetSubClass(RTSEMMUTEX hMutexSem, uint32_t uSubClass)
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| 232 | {
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| 233 | #ifdef RTSEMMUTEX_STRICT
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| 234 | /*
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| 235 | * Validate.
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| 236 | */
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| 237 | RTSEMMUTEXINTERNAL *pThis = hMutexSem;
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| 238 | AssertPtrReturn(pThis, RTLOCKVAL_SUB_CLASS_INVALID);
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| 239 | AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, RTLOCKVAL_SUB_CLASS_INVALID);
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| 240 |
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| 241 | return RTLockValidatorRecExclSetSubClass(&pThis->ValidatorRec, uSubClass);
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| 242 | #else
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[62564] | 243 | RT_NOREF_PV(hMutexSem); RT_NOREF_PV(uSubClass);
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[25711] | 244 | return RTLOCKVAL_SUB_CLASS_INVALID;
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| 245 | #endif
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| 246 | }
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| 247 |
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| 248 |
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[25724] | 249 | DECL_FORCE_INLINE(int) rtSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, PCRTLOCKVALSRCPOS pSrcPos)
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[1] | 250 | {
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| 251 | /*
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| 252 | * Validate input.
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| 253 | */
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[25721] | 254 | struct RTSEMMUTEXINTERNAL *pThis = hMutexSem;
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[25373] | 255 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 256 | AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
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[1] | 257 |
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| 258 | /*
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| 259 | * Check if nested request.
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| 260 | */
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[25373] | 261 | pthread_t Self = pthread_self();
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| 262 | if ( pThis->Owner == Self
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| 263 | && pThis->cNesting > 0)
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[1] | 264 | {
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[25614] | 265 | #ifdef RTSEMMUTEX_STRICT
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| 266 | int rc9 = RTLockValidatorRecExclRecursion(&pThis->ValidatorRec, pSrcPos);
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| 267 | if (RT_FAILURE(rc9))
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| 268 | return rc9;
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| 269 | #endif
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[25373] | 270 | ASMAtomicIncU32(&pThis->cNesting);
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[1] | 271 | return VINF_SUCCESS;
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| 272 | }
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| 273 |
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| 274 | /*
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| 275 | * Lock it.
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| 276 | */
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[25614] | 277 | RTTHREAD hThreadSelf = NIL_RTTHREAD;
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[25467] | 278 | if (cMillies != 0)
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| 279 | {
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| 280 | #ifdef RTSEMMUTEX_STRICT
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[25614] | 281 | hThreadSelf = RTThreadSelfAutoAdopt();
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[25638] | 282 | int rc9 = RTLockValidatorRecExclCheckOrderAndBlocking(&pThis->ValidatorRec, hThreadSelf, pSrcPos, true,
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[25685] | 283 | cMillies, RTTHREADSTATE_MUTEX, true);
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[25467] | 284 | if (RT_FAILURE(rc9))
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| 285 | return rc9;
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[25614] | 286 | #else
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| 287 | hThreadSelf = RTThreadSelf();
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[25638] | 288 | RTThreadBlocking(hThreadSelf, RTTHREADSTATE_MUTEX, true);
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[62564] | 289 | RT_NOREF_PV(pSrcPos);
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[25478] | 290 | #endif
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[25467] | 291 | }
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| 292 |
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[1] | 293 | if (cMillies == RT_INDEFINITE_WAIT)
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| 294 | {
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| 295 | /* take mutex */
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[25373] | 296 | int rc = pthread_mutex_lock(&pThis->Mutex);
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[25467] | 297 | RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_MUTEX);
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[1] | 298 | if (rc)
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| 299 | {
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[25721] | 300 | AssertMsgFailed(("Failed to lock mutex sem %p, rc=%d.\n", hMutexSem, rc)); NOREF(rc);
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[1] | 301 | return RTErrConvertFromErrno(rc);
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| 302 | }
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| 303 | }
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| 304 | else
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| 305 | {
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[63052] | 306 | int rc;
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| 307 | #if !defined(RT_OS_DARWIN) && !defined(RT_OS_NETBSD)
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[43559] | 308 | struct timespec ts = {0,0};
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[63052] | 309 | # if defined(RT_OS_HAIKU)
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[43363] | 310 | struct timeval tv = {0,0};
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| 311 | gettimeofday(&tv, NULL);
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| 312 | ts.tv_sec = tv.tv_sec;
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[63029] | 313 | ts.tv_nsec = tv.tv_usec * 1000;
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[63052] | 314 | # else
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[1] | 315 | clock_gettime(CLOCK_REALTIME, &ts);
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[63052] | 316 | # endif
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[1] | 317 | if (cMillies != 0)
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| 318 | {
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[63029] | 319 | ts.tv_nsec += (cMillies % 1000) * 1000000;
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| 320 | ts.tv_sec += cMillies / 1000;
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| 321 | if (ts.tv_nsec >= 1000000000)
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[1] | 322 | {
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[63029] | 323 | ts.tv_nsec -= 1000000000;
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[1] | 324 | ts.tv_sec++;
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| 325 | }
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| 326 | }
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| 327 |
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| 328 | /* take mutex */
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[63052] | 329 | rc = pthread_mutex_timedlock(&pThis->Mutex, &ts);
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[43558] | 330 | #else
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[63052] | 331 | /*
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| 332 | * When there's no pthread_mutex_timedlock() use a crude sleep
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| 333 | * and retry approximation. Since the sleep interval is
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| 334 | * relative, we don't need to convert to the absolute time
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| 335 | * here only to convert back to relative in the fallback
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| 336 | * function.
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| 337 | */
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| 338 | rc = rtSemFallbackPthreadMutexTimedlock(&pThis->Mutex, cMillies);
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[43558] | 339 | #endif
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[25467] | 340 | RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_MUTEX);
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[1] | 341 | if (rc)
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| 342 | {
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[25721] | 343 | AssertMsg(rc == ETIMEDOUT, ("Failed to lock mutex sem %p, rc=%d.\n", hMutexSem, rc)); NOREF(rc);
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[1] | 344 | return RTErrConvertFromErrno(rc);
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| 345 | }
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| 346 | }
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| 347 |
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| 348 | /*
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| 349 | * Set the owner and nesting.
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| 350 | */
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[25373] | 351 | pThis->Owner = Self;
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| 352 | ASMAtomicWriteU32(&pThis->cNesting, 1);
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[8649] | 353 | #ifdef RTSEMMUTEX_STRICT
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[25614] | 354 | RTLockValidatorRecExclSetOwner(&pThis->ValidatorRec, hThreadSelf, pSrcPos, true);
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[8649] | 355 | #endif
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[1] | 356 |
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| 357 | return VINF_SUCCESS;
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| 358 | }
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| 359 |
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| 360 |
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[25711] | 361 | #undef RTSemMutexRequest
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[25724] | 362 | RTDECL(int) RTSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
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[1] | 363 | {
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[25373] | 364 | #ifndef RTSEMMUTEX_STRICT
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[25721] | 365 | return rtSemMutexRequest(hMutexSem, cMillies, NULL);
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[25373] | 366 | #else
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[25607] | 367 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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[25721] | 368 | return rtSemMutexRequest(hMutexSem, cMillies, &SrcPos);
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[25373] | 369 | #endif
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| 370 | }
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| 371 |
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| 372 |
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[25724] | 373 | RTDECL(int) RTSemMutexRequestDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
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[25373] | 374 | {
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[25607] | 375 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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[25721] | 376 | return rtSemMutexRequest(hMutexSem, cMillies, &SrcPos);
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[25373] | 377 | }
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| 378 |
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| 379 |
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[25711] | 380 | #undef RTSemMutexRequestNoResume
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[25724] | 381 | RTDECL(int) RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
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[25373] | 382 | {
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[25478] | 383 | /* (EINTR isn't returned by the wait functions we're using.) */
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[25373] | 384 | #ifndef RTSEMMUTEX_STRICT
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[25721] | 385 | return rtSemMutexRequest(hMutexSem, cMillies, NULL);
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[25373] | 386 | #else
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[25607] | 387 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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[25721] | 388 | return rtSemMutexRequest(hMutexSem, cMillies, &SrcPos);
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[25373] | 389 | #endif
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[1] | 390 | }
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| 391 |
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| 392 |
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[25724] | 393 | RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
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[25373] | 394 | {
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[25607] | 395 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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[25721] | 396 | return rtSemMutexRequest(hMutexSem, cMillies, &SrcPos);
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[25373] | 397 | }
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| 398 |
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| 399 |
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[25721] | 400 | RTDECL(int) RTSemMutexRelease(RTSEMMUTEX hMutexSem)
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[1] | 401 | {
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| 402 | /*
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| 403 | * Validate input.
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| 404 | */
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[25721] | 405 | struct RTSEMMUTEXINTERNAL *pThis = hMutexSem;
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[25373] | 406 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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| 407 | AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);
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[1] | 408 |
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[25614] | 409 | #ifdef RTSEMMUTEX_STRICT
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| 410 | int rc9 = RTLockValidatorRecExclReleaseOwner(&pThis->ValidatorRec, pThis->cNesting == 1);
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| 411 | if (RT_FAILURE(rc9))
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| 412 | return rc9;
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| 413 | #endif
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| 414 |
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[1] | 415 | /*
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| 416 | * Check if nested.
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| 417 | */
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[25373] | 418 | pthread_t Self = pthread_self();
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| 419 | if (RT_UNLIKELY( pThis->Owner != Self
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| 420 | || pThis->cNesting == 0))
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[1] | 421 | {
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| 422 | AssertMsgFailed(("Not owner of mutex %p!! Self=%08x Owner=%08x cNesting=%d\n",
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[25373] | 423 | pThis, Self, pThis->Owner, pThis->cNesting));
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[1] | 424 | return VERR_NOT_OWNER;
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| 425 | }
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| 426 |
|
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| 427 | /*
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| 428 | * If nested we'll just pop a nesting.
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| 429 | */
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[25373] | 430 | if (pThis->cNesting > 1)
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[1] | 431 | {
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[25373] | 432 | ASMAtomicDecU32(&pThis->cNesting);
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[1] | 433 | return VINF_SUCCESS;
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| 434 | }
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| 435 |
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| 436 | /*
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| 437 | * Clear the state. (cNesting == 1)
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| 438 | */
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[25373] | 439 | pThis->Owner = (pthread_t)-1;
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[25624] | 440 | ASMAtomicWriteU32(&pThis->cNesting, 0);
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[1] | 441 |
|
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| 442 | /*
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| 443 | * Unlock mutex semaphore.
|
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| 444 | */
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[25373] | 445 | int rc = pthread_mutex_unlock(&pThis->Mutex);
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| 446 | if (RT_UNLIKELY(rc))
|
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[1] | 447 | {
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[25721] | 448 | AssertMsgFailed(("Failed to unlock mutex sem %p, rc=%d.\n", hMutexSem, rc)); NOREF(rc);
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[1] | 449 | return RTErrConvertFromErrno(rc);
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| 450 | }
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| 451 |
|
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| 452 | return VINF_SUCCESS;
|
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| 453 | }
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| 454 |
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[25624] | 455 |
|
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[25721] | 456 | RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem)
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[25624] | 457 | {
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| 458 | /*
|
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| 459 | * Validate.
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| 460 | */
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[25721] | 461 | RTSEMMUTEXINTERNAL *pThis = hMutexSem;
|
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[25628] | 462 | AssertPtrReturn(pThis, false);
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| 463 | AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, false);
|
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[25624] | 464 |
|
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| 465 | return pThis->Owner != (pthread_t)-1;
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| 466 | }
|
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| 467 |
|
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