1 | /* $Id: semeventmulti-r0drv-solaris.c 76553 2019-01-01 01:45:53Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Solaris.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2019 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #define RTSEMEVENTMULTI_WITHOUT_REMAPPING
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32 | #include "the-solaris-kernel.h"
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33 | #include "internal/iprt.h"
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34 | #include <iprt/semaphore.h>
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35 |
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36 | #include <iprt/assert.h>
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37 | #include <iprt/asm.h>
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38 | #if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
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39 | # include <iprt/asm-amd64-x86.h>
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40 | #endif
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41 | #include <iprt/err.h>
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42 | #include <iprt/lockvalidator.h>
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43 | #include <iprt/mem.h>
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44 | #include <iprt/mp.h>
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45 | #include <iprt/thread.h>
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46 | #include <iprt/time.h>
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47 | #include "internal/magics.h"
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48 | #include "semeventwait-r0drv-solaris.h"
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49 |
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50 |
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51 | /*********************************************************************************************************************************
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52 | * Defined Constants And Macros *
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53 | *********************************************************************************************************************************/
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54 | /** @name fStateAndGen values
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55 | * @{ */
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56 | /** The state bit number. */
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57 | #define RTSEMEVENTMULTISOL_STATE_BIT 0
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58 | /** The state mask. */
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59 | #define RTSEMEVENTMULTISOL_STATE_MASK RT_BIT_32(RTSEMEVENTMULTISOL_STATE_BIT)
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60 | /** The generation mask. */
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61 | #define RTSEMEVENTMULTISOL_GEN_MASK ~RTSEMEVENTMULTISOL_STATE_MASK
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62 | /** The generation shift. */
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63 | #define RTSEMEVENTMULTISOL_GEN_SHIFT 1
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64 | /** The initial variable value. */
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65 | #define RTSEMEVENTMULTISOL_STATE_GEN_INIT UINT32_C(0xfffffffc)
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66 | /** @} */
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67 |
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68 |
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69 | /*********************************************************************************************************************************
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70 | * Structures and Typedefs *
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71 | *********************************************************************************************************************************/
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72 | /**
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73 | * Solaris multiple release event semaphore.
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74 | */
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75 | typedef struct RTSEMEVENTMULTIINTERNAL
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76 | {
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77 | /** Magic value (RTSEMEVENTMULTI_MAGIC). */
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78 | uint32_t volatile u32Magic;
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79 | /** The number of references. */
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80 | uint32_t volatile cRefs;
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81 | /** The object state bit and generation counter.
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82 | * The generation counter is incremented every time the object is
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83 | * signalled. */
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84 | uint32_t volatile fStateAndGen;
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85 | /** The Solaris mutex protecting this structure and pairing up the with the cv. */
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86 | kmutex_t Mtx;
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87 | /** The Solaris condition variable. */
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88 | kcondvar_t Cnd;
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89 | } RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
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90 |
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91 |
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92 |
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93 | RTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI phEventMultiSem)
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94 | {
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95 | return RTSemEventMultiCreateEx(phEventMultiSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
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96 | }
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97 |
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98 |
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99 | RTDECL(int) RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
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100 | const char *pszNameFmt, ...)
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101 | {
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102 | AssertReturn(!(fFlags & ~RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
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103 | AssertPtrReturn(phEventMultiSem, VERR_INVALID_POINTER);
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104 | RT_ASSERT_PREEMPTIBLE();
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105 |
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106 | AssertCompile(sizeof(RTSEMEVENTMULTIINTERNAL) > sizeof(void *));
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107 | PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
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108 | if (pThis)
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109 | {
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110 | pThis->u32Magic = RTSEMEVENTMULTI_MAGIC;
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111 | pThis->cRefs = 1;
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112 | pThis->fStateAndGen = RTSEMEVENTMULTISOL_STATE_GEN_INIT;
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113 | mutex_init(&pThis->Mtx, "IPRT Multiple Release Event Semaphore", MUTEX_DRIVER, (void *)ipltospl(DISP_LEVEL));
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114 | cv_init(&pThis->Cnd, "IPRT CV", CV_DRIVER, NULL);
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115 |
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116 | *phEventMultiSem = pThis;
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117 | return VINF_SUCCESS;
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118 | }
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119 | return VERR_NO_MEMORY;
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120 | }
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121 |
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122 |
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123 | /**
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124 | * Retain a reference to the semaphore.
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125 | *
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126 | * @param pThis The semaphore.
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127 | */
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128 | DECLINLINE(void) rtR0SemEventMultiSolRetain(PRTSEMEVENTMULTIINTERNAL pThis)
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129 | {
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130 | uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
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131 | Assert(cRefs && cRefs < 100000);
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132 | NOREF(cRefs);
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133 | }
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134 |
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135 |
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136 | /**
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137 | * Destructor that is called when cRefs == 0.
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138 | *
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139 | * @param pThis The instance to destroy.
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140 | */
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141 | static void rtSemEventMultiDtor(PRTSEMEVENTMULTIINTERNAL pThis)
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142 | {
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143 | Assert(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC);
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144 | cv_destroy(&pThis->Cnd);
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145 | mutex_destroy(&pThis->Mtx);
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146 | RTMemFree(pThis);
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147 | }
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148 |
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149 |
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150 | /**
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151 | * Release a reference, destroy the thing if necessary.
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152 | *
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153 | * @param pThis The semaphore.
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154 | */
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155 | DECLINLINE(void) rtR0SemEventMultiSolRelease(PRTSEMEVENTMULTIINTERNAL pThis)
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156 | {
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157 | if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
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158 | rtSemEventMultiDtor(pThis);
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159 | }
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160 |
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161 |
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162 |
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163 | RTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
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164 | {
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165 | PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
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166 | if (pThis == NIL_RTSEMEVENTMULTI)
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167 | return VINF_SUCCESS;
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168 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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169 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
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170 | AssertMsgReturn(pThis->cRefs > 0, ("pThis=%p cRefs=%d\n", pThis, pThis->cRefs), VERR_INVALID_HANDLE);
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171 | RT_ASSERT_INTS_ON();
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172 |
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173 | mutex_enter(&pThis->Mtx);
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174 |
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175 | /* Invalidate the handle and wake up all threads that might be waiting on the semaphore. */
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176 | Assert(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
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177 | ASMAtomicWriteU32(&pThis->u32Magic, RTSEMEVENTMULTI_MAGIC_DEAD);
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178 | ASMAtomicAndU32(&pThis->fStateAndGen, RTSEMEVENTMULTISOL_GEN_MASK);
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179 | cv_broadcast(&pThis->Cnd);
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180 |
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181 | /* Drop the reference from RTSemEventMultiCreateEx. */
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182 | mutex_exit(&pThis->Mtx);
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183 | rtR0SemEventMultiSolRelease(pThis);
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184 |
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185 | return VINF_SUCCESS;
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186 | }
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187 |
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188 |
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189 | RTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
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190 | {
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191 | PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
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192 | RT_ASSERT_PREEMPT_CPUID_VAR();
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193 |
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194 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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195 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC,
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196 | ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
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197 | VERR_INVALID_HANDLE);
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198 | RT_ASSERT_INTS_ON();
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199 | rtR0SemEventMultiSolRetain(pThis);
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200 | rtR0SemSolWaitEnterMutexWithUnpinningHack(&pThis->Mtx);
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201 | Assert(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
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202 |
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203 | /*
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204 | * Do the job.
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205 | */
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206 | uint32_t fNew = ASMAtomicUoReadU32(&pThis->fStateAndGen);
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207 | fNew += 1 << RTSEMEVENTMULTISOL_GEN_SHIFT;
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208 | fNew |= RTSEMEVENTMULTISOL_STATE_MASK;
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209 | ASMAtomicWriteU32(&pThis->fStateAndGen, fNew);
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210 |
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211 | cv_broadcast(&pThis->Cnd);
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212 |
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213 | mutex_exit(&pThis->Mtx);
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214 |
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215 | rtR0SemEventMultiSolRelease(pThis);
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216 | #ifdef DEBUG_ramshankar
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217 | /** See @bugref{6318#c11}. */
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218 | return VINF_SUCCESS;
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219 | #endif
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220 | RT_ASSERT_PREEMPT_CPUID();
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221 | return VINF_SUCCESS;
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222 | }
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223 |
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224 |
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225 | RTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI hEventMultiSem)
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226 | {
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227 | PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
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228 | RT_ASSERT_PREEMPT_CPUID_VAR();
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229 |
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230 | AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
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231 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC,
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232 | ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
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233 | VERR_INVALID_HANDLE);
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234 | RT_ASSERT_INTS_ON();
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235 |
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236 | rtR0SemEventMultiSolRetain(pThis);
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237 | rtR0SemSolWaitEnterMutexWithUnpinningHack(&pThis->Mtx);
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238 | Assert(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC);
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239 |
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240 | /*
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241 | * Do the job (could be done without the lock, but play safe).
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242 | */
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243 | ASMAtomicAndU32(&pThis->fStateAndGen, ~RTSEMEVENTMULTISOL_STATE_MASK);
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244 |
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245 | mutex_exit(&pThis->Mtx);
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246 | rtR0SemEventMultiSolRelease(pThis);
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247 |
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248 | #ifdef DEBUG_ramshankar
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249 | /** See @bugref{6318#c11}. */
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250 | return VINF_SUCCESS;
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251 | #endif
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252 | RT_ASSERT_PREEMPT_CPUID();
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253 | return VINF_SUCCESS;
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254 | }
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255 |
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256 |
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257 | /**
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258 | * Worker for RTSemEventMultiWaitEx and RTSemEventMultiWaitExDebug.
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259 | *
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260 | * @returns VBox status code.
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261 | * @param pThis The event semaphore.
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262 | * @param fFlags See RTSemEventMultiWaitEx.
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263 | * @param uTimeout See RTSemEventMultiWaitEx.
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264 | * @param pSrcPos The source code position of the wait.
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265 | */
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266 | static int rtR0SemEventMultiSolWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
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267 | PCRTLOCKVALSRCPOS pSrcPos)
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268 | {
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269 | uint32_t fOrgStateAndGen;
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270 | int rc;
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271 |
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272 | /*
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273 | * Validate the input.
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274 | */
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275 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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276 | AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
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277 | AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
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278 | rtR0SemEventMultiSolRetain(pThis);
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279 | mutex_enter(&pThis->Mtx); /* this could be moved down to the else, but play safe for now. */
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280 |
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281 | /*
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282 | * Is the event already signalled or do we have to wait?
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283 | */
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284 | fOrgStateAndGen = ASMAtomicUoReadU32(&pThis->fStateAndGen);
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285 | if (fOrgStateAndGen & RTSEMEVENTMULTISOL_STATE_MASK)
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286 | rc = VINF_SUCCESS;
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287 | else
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288 | {
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289 | /*
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290 | * We have to wait.
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291 | */
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292 | RTR0SEMSOLWAIT Wait;
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293 | rc = rtR0SemSolWaitInit(&Wait, fFlags, uTimeout);
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294 | if (RT_SUCCESS(rc))
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295 | {
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296 | for (;;)
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297 | {
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298 | /* The destruction test. */
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299 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
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300 | rc = VERR_SEM_DESTROYED;
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301 | else
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302 | {
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303 | /* Check the exit conditions. */
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304 | if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
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305 | rc = VERR_SEM_DESTROYED;
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306 | else if (ASMAtomicUoReadU32(&pThis->fStateAndGen) != fOrgStateAndGen)
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307 | rc = VINF_SUCCESS;
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308 | else if (rtR0SemSolWaitHasTimedOut(&Wait))
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309 | rc = VERR_TIMEOUT;
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310 | else if (rtR0SemSolWaitWasInterrupted(&Wait))
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311 | rc = VERR_INTERRUPTED;
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312 | else
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313 | {
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314 | /* Do the wait and then recheck the conditions. */
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315 | rtR0SemSolWaitDoIt(&Wait, &pThis->Cnd, &pThis->Mtx, &pThis->fStateAndGen, fOrgStateAndGen);
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316 | continue;
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317 | }
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318 | }
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319 | break;
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320 | }
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321 | rtR0SemSolWaitDelete(&Wait);
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322 | }
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323 | }
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324 |
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325 | mutex_exit(&pThis->Mtx);
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326 | rtR0SemEventMultiSolRelease(pThis);
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327 | return rc;
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328 | }
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329 |
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330 |
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331 |
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332 | RTDECL(int) RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
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333 | {
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334 | #ifndef RTSEMEVENT_STRICT
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335 | return rtR0SemEventMultiSolWait(hEventMultiSem, fFlags, uTimeout, NULL);
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336 | #else
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337 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
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338 | return rtR0SemEventMultiSolWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
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339 | #endif
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340 | }
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341 |
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342 |
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343 | RTDECL(int) RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
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344 | RTHCUINTPTR uId, RT_SRC_POS_DECL)
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345 | {
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346 | RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
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347 | return rtR0SemEventMultiSolWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
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348 | }
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349 |
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350 |
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351 | RTDECL(uint32_t) RTSemEventMultiGetResolution(void)
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352 | {
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353 | return rtR0SemSolWaitGetResolution();
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354 | }
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355 |
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