1 | /* $Id: req.cpp 76346 2018-12-22 00:51:28Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Request packets
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 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 | #include <iprt/req.h>
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/assert.h>
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35 | #include <iprt/asm.h>
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36 | #include <iprt/err.h>
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37 | #include <iprt/string.h>
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38 | #include <iprt/time.h>
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39 | #include <iprt/semaphore.h>
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40 | #include <iprt/thread.h>
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41 | #include <iprt/log.h>
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42 | #include <iprt/mem.h>
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43 |
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44 | #include "internal/req.h"
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45 | #include "internal/magics.h"
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46 |
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47 |
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48 | /*********************************************************************************************************************************
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49 | * Internal Functions *
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50 | *********************************************************************************************************************************/
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51 |
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52 |
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53 | /**
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54 | * Allocate a new request from the heap.
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55 | *
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56 | * @returns IPRT status code.
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57 | * @param enmType The reques type.
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58 | * @param fPoolOrQueue The owner type.
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59 | * @param pvOwner The owner.
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60 | * @param phReq Where to return the request handle.
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61 | */
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62 | DECLHIDDEN(int) rtReqAlloc(RTREQTYPE enmType, bool fPoolOrQueue, void *pvOwner, PRTREQ *phReq)
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63 | {
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64 | PRTREQ pReq = (PRTREQ)RTMemAllocZ(sizeof(*pReq));
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65 | if (RT_UNLIKELY(!pReq))
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66 | return VERR_NO_MEMORY;
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67 |
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68 | /*
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69 | * Create the semaphore used for waiting.
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70 | */
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71 | int rc = RTSemEventCreate(&pReq->EventSem);
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72 | AssertRCReturnStmt(rc, RTMemFree(pReq), rc);
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73 |
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74 | /*
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75 | * Initialize the packet and return it.
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76 | */
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77 | pReq->u32Magic = RTREQ_MAGIC;
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78 | pReq->fEventSemClear = true;
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79 | pReq->fSignalPushBack = true;
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80 | pReq->fPoolOrQueue = fPoolOrQueue;
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81 | pReq->iStatusX = VERR_RT_REQUEST_STATUS_STILL_PENDING;
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82 | pReq->enmState = RTREQSTATE_ALLOCATED;
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83 | pReq->pNext = NULL;
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84 | pReq->uOwner.pv = pvOwner;
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85 | pReq->fFlags = RTREQFLAGS_IPRT_STATUS;
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86 | pReq->enmType = enmType;
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87 | pReq->cRefs = 1;
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88 |
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89 | *phReq = pReq;
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90 | return VINF_SUCCESS;
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91 | }
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92 |
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93 |
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94 | /**
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95 | * Re-initializes a request when it's being recycled.
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96 | *
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97 | * @returns IRPT status code, the request is freed on failure.
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98 | * @param pReq The request.
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99 | * @param enmType The request type.
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100 | */
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101 | DECLHIDDEN(int) rtReqReInit(PRTREQINT pReq, RTREQTYPE enmType)
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102 | {
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103 | Assert(pReq->u32Magic == RTREQ_MAGIC);
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104 | Assert(pReq->enmType == RTREQTYPE_INVALID);
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105 | Assert(pReq->enmState == RTREQSTATE_FREE);
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106 | Assert(pReq->cRefs == 0);
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107 |
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108 | /*
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109 | * Make sure the event sem is not signaled.
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110 | */
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111 | if (!pReq->fEventSemClear)
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112 | {
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113 | int rc = RTSemEventWait(pReq->EventSem, 0);
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114 | if (rc != VINF_SUCCESS && rc != VERR_TIMEOUT)
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115 | {
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116 | /*
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117 | * This shall not happen, but if it does we'll just destroy
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118 | * the semaphore and create a new one.
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119 | */
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120 | AssertMsgFailed(("rc=%Rrc from RTSemEventWait(%#x).\n", rc, pReq->EventSem));
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121 | RTSemEventDestroy(pReq->EventSem);
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122 | rc = RTSemEventCreate(&pReq->EventSem);
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123 | if (RT_FAILURE(rc))
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124 | {
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125 | AssertRC(rc);
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126 | pReq->EventSem = NIL_RTSEMEVENT;
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127 | rtReqFreeIt(pReq);
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128 | return rc;
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129 | }
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130 | }
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131 | pReq->fEventSemClear = true;
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132 | }
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133 | else
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134 | Assert(RTSemEventWait(pReq->EventSem, 0) == VERR_TIMEOUT);
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135 |
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136 | /*
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137 | * Initialize the packet and return it.
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138 | */
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139 | ASMAtomicWriteNullPtr(&pReq->pNext);
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140 | pReq->iStatusX = VERR_RT_REQUEST_STATUS_STILL_PENDING;
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141 | pReq->enmState = RTREQSTATE_ALLOCATED;
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142 | pReq->fFlags = RTREQFLAGS_IPRT_STATUS;
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143 | pReq->enmType = enmType;
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144 | pReq->cRefs = 1;
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145 | return VINF_SUCCESS;
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146 | }
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147 |
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148 |
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149 | RTDECL(uint32_t) RTReqRetain(PRTREQ hReq)
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150 | {
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151 | PRTREQINT pReq = hReq;
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152 | AssertPtrReturn(pReq, UINT32_MAX);
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153 | AssertReturn(pReq->u32Magic == RTREQ_MAGIC, UINT32_MAX);
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154 |
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155 | return ASMAtomicIncU32(&pReq->cRefs);
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156 | }
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157 | RT_EXPORT_SYMBOL(RTReqRetain);
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158 |
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159 |
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160 | /**
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161 | * Frees a request.
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162 | *
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163 | * @param pReq The request.
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164 | */
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165 | DECLHIDDEN(void) rtReqFreeIt(PRTREQINT pReq)
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166 | {
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167 | Assert(pReq->u32Magic == RTREQ_MAGIC);
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168 | Assert(pReq->cRefs == 0);
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169 |
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170 | pReq->u32Magic = RTREQ_MAGIC_DEAD;
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171 | RTSemEventDestroy(pReq->EventSem);
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172 | pReq->EventSem = NIL_RTSEMEVENT;
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173 | RTSemEventMultiDestroy(pReq->hPushBackEvt);
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174 | pReq->hPushBackEvt = NIL_RTSEMEVENTMULTI;
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175 | RTMemFree(pReq);
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176 | }
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177 |
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178 |
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179 | RTDECL(uint32_t) RTReqRelease(PRTREQ hReq)
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180 | {
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181 | /*
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182 | * Ignore NULL and validate the request.
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183 | */
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184 | if (!hReq)
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185 | return 0;
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186 | PRTREQINT pReq = hReq;
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187 | AssertPtrReturn(pReq, UINT32_MAX);
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188 | AssertReturn(pReq->u32Magic == RTREQ_MAGIC, UINT32_MAX);
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189 |
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190 | /*
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191 | * Drop a reference, recycle the request when we reach 0.
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192 | */
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193 | uint32_t cRefs = ASMAtomicDecU32(&pReq->cRefs);
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194 | if (cRefs == 0)
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195 | {
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196 | /*
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197 | * Check packet state.
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198 | */
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199 | switch (pReq->enmState)
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200 | {
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201 | case RTREQSTATE_ALLOCATED:
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202 | case RTREQSTATE_COMPLETED:
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203 | break;
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204 | default:
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205 | AssertMsgFailed(("Invalid state %d!\n", pReq->enmState));
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206 | return 0;
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207 | }
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208 |
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209 | /*
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210 | * Make it a free packet and put it into one of the free packet lists.
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211 | */
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212 | pReq->enmState = RTREQSTATE_FREE;
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213 | pReq->iStatusX = VERR_RT_REQUEST_STATUS_FREED;
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214 | pReq->enmType = RTREQTYPE_INVALID;
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215 |
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216 | bool fRecycled;
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217 | if (pReq->fPoolOrQueue)
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218 | fRecycled = rtReqPoolRecycle(pReq->uOwner.hPool, pReq);
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219 | else
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220 | fRecycled = rtReqQueueRecycle(pReq->uOwner.hQueue, pReq);
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221 | if (!fRecycled)
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222 | rtReqFreeIt(pReq);
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223 | }
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224 |
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225 | return cRefs;
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226 | }
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227 | RT_EXPORT_SYMBOL(RTReqRelease);
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228 |
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229 |
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230 | RTDECL(int) RTReqSubmit(PRTREQ hReq, RTMSINTERVAL cMillies)
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231 | {
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232 | LogFlow(("RTReqSubmit: hReq=%p cMillies=%d\n", hReq, cMillies));
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233 |
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234 | /*
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235 | * Verify the supplied package.
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236 | */
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237 | PRTREQINT pReq = hReq;
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238 | AssertPtrReturn(pReq, VERR_INVALID_HANDLE);
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239 | AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_HANDLE);
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240 | AssertMsgReturn(pReq->enmState == RTREQSTATE_ALLOCATED, ("%d\n", pReq->enmState), VERR_RT_REQUEST_STATE);
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241 | AssertMsgReturn(pReq->uOwner.hQueue && !pReq->pNext && pReq->EventSem != NIL_RTSEMEVENT,
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242 | ("Invalid request package! Anyone cooking their own packages???\n"),
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243 | VERR_RT_REQUEST_INVALID_PACKAGE);
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244 | AssertMsgReturn(pReq->enmType > RTREQTYPE_INVALID && pReq->enmType < RTREQTYPE_MAX,
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245 | ("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n",
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246 | pReq->enmType, RTREQTYPE_INVALID + 1, RTREQTYPE_MAX - 1),
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247 | VERR_RT_REQUEST_INVALID_TYPE);
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248 |
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249 | /*
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250 | * Insert it. Donate the caller's reference if RTREQFLAGS_NO_WAIT is set,
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251 | * otherwise retain another reference for the queue.
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252 | */
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253 | pReq->uSubmitNanoTs = RTTimeNanoTS();
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254 | pReq->enmState = RTREQSTATE_QUEUED;
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255 | unsigned fFlags = ((RTREQ volatile *)pReq)->fFlags; /* volatile paranoia */
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256 | if (!(fFlags & RTREQFLAGS_NO_WAIT))
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257 | RTReqRetain(pReq);
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258 |
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259 | if (!pReq->fPoolOrQueue)
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260 | rtReqQueueSubmit(pReq->uOwner.hQueue, pReq);
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261 | else
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262 | rtReqPoolSubmit(pReq->uOwner.hPool, pReq);
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263 |
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264 | /*
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265 | * Wait and return.
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266 | */
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267 | int rc = VINF_SUCCESS;
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268 | if (!(fFlags & RTREQFLAGS_NO_WAIT))
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269 | rc = RTReqWait(pReq, cMillies);
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270 |
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271 | LogFlow(("RTReqSubmit: returns %Rrc\n", rc));
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272 | return rc;
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273 | }
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274 | RT_EXPORT_SYMBOL(RTReqSubmit);
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275 |
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276 |
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277 | RTDECL(int) RTReqWait(PRTREQ hReq, RTMSINTERVAL cMillies)
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278 | {
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279 | LogFlow(("RTReqWait: hReq=%p cMillies=%d\n", hReq, cMillies));
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280 |
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281 | /*
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282 | * Verify the supplied package.
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283 | */
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284 | PRTREQINT pReq = hReq;
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285 | AssertPtrReturn(pReq, VERR_INVALID_HANDLE);
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286 | AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_HANDLE);
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287 | AssertMsgReturn( pReq->enmState == RTREQSTATE_QUEUED
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288 | || pReq->enmState == RTREQSTATE_PROCESSING
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289 | || pReq->enmState == RTREQSTATE_COMPLETED,
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290 | ("Invalid state %d\n", pReq->enmState),
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291 | VERR_RT_REQUEST_STATE);
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292 | AssertMsgReturn(pReq->uOwner.hQueue && pReq->EventSem != NIL_RTSEMEVENT,
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293 | ("Invalid request package! Anyone cooking their own packages???\n"),
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294 | VERR_RT_REQUEST_INVALID_PACKAGE);
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295 | AssertMsgReturn(pReq->enmType > RTREQTYPE_INVALID && pReq->enmType < RTREQTYPE_MAX,
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296 | ("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n",
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297 | pReq->enmType, RTREQTYPE_INVALID + 1, RTREQTYPE_MAX - 1),
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298 | VERR_RT_REQUEST_INVALID_TYPE);
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299 |
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300 | /*
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301 | * Wait on the package.
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302 | */
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303 | int rc;
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304 | if (cMillies != RT_INDEFINITE_WAIT)
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305 | rc = RTSemEventWait(pReq->EventSem, cMillies);
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306 | else
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307 | {
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308 | do
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309 | {
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310 | rc = RTSemEventWait(pReq->EventSem, RT_INDEFINITE_WAIT);
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311 | Assert(rc != VERR_TIMEOUT);
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312 | } while (pReq->enmState != RTREQSTATE_COMPLETED);
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313 | }
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314 | if (rc == VINF_SUCCESS)
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315 | ASMAtomicXchgSize(&pReq->fEventSemClear, true);
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316 | if (pReq->enmState == RTREQSTATE_COMPLETED)
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317 | rc = VINF_SUCCESS;
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318 | LogFlow(("RTReqWait: returns %Rrc\n", rc));
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319 | Assert(rc != VERR_INTERRUPTED);
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320 | Assert(pReq->cRefs >= 1);
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321 | return rc;
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322 | }
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323 | RT_EXPORT_SYMBOL(RTReqWait);
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324 |
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325 |
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326 | RTDECL(int) RTReqGetStatus(PRTREQ hReq)
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327 | {
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328 | PRTREQINT pReq = hReq;
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329 | AssertPtrReturn(pReq, VERR_INVALID_POINTER);
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330 | AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_POINTER);
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331 | return pReq->iStatusX;
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332 | }
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333 | RT_EXPORT_SYMBOL(RTReqGetStatus);
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334 |
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335 |
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336 |
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337 | /**
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338 | * Process one request.
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339 | *
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340 | * @returns IPRT status code.
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341 | *
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342 | * @param pReq Request packet to process.
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343 | */
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344 | DECLHIDDEN(int) rtReqProcessOne(PRTREQINT pReq)
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345 | {
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346 | LogFlow(("rtReqProcessOne: pReq=%p type=%d fFlags=%#x\n", pReq, pReq->enmType, pReq->fFlags));
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347 |
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348 | /*
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349 | * Process the request.
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350 | */
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351 | Assert(pReq->enmState == RTREQSTATE_QUEUED);
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352 | pReq->enmState = RTREQSTATE_PROCESSING;
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353 | int rcRet = VINF_SUCCESS; /* the return code of this function. */
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354 | int rcReq = VERR_NOT_IMPLEMENTED; /* the request status. */
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355 | switch (pReq->enmType)
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356 | {
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357 | /*
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358 | * A packed down call frame.
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359 | */
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360 | case RTREQTYPE_INTERNAL:
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361 | {
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362 | uintptr_t *pauArgs = &pReq->u.Internal.aArgs[0];
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363 | union
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364 | {
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365 | PFNRT pfn;
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366 | DECLCALLBACKMEMBER(int, pfn00)(void);
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367 | DECLCALLBACKMEMBER(int, pfn01)(uintptr_t);
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368 | DECLCALLBACKMEMBER(int, pfn02)(uintptr_t, uintptr_t);
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369 | DECLCALLBACKMEMBER(int, pfn03)(uintptr_t, uintptr_t, uintptr_t);
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370 | DECLCALLBACKMEMBER(int, pfn04)(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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371 | DECLCALLBACKMEMBER(int, pfn05)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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372 | DECLCALLBACKMEMBER(int, pfn06)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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373 | DECLCALLBACKMEMBER(int, pfn07)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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374 | DECLCALLBACKMEMBER(int, pfn08)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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375 | DECLCALLBACKMEMBER(int, pfn09)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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376 | DECLCALLBACKMEMBER(int, pfn10)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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377 | DECLCALLBACKMEMBER(int, pfn11)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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378 | DECLCALLBACKMEMBER(int, pfn12)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
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379 | } u;
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380 | u.pfn = pReq->u.Internal.pfn;
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381 | #ifndef RT_ARCH_X86
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382 | switch (pReq->u.Internal.cArgs)
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383 | {
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384 | case 0: rcRet = u.pfn00(); break;
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385 | case 1: rcRet = u.pfn01(pauArgs[0]); break;
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386 | case 2: rcRet = u.pfn02(pauArgs[0], pauArgs[1]); break;
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387 | case 3: rcRet = u.pfn03(pauArgs[0], pauArgs[1], pauArgs[2]); break;
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388 | case 4: rcRet = u.pfn04(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3]); break;
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389 | case 5: rcRet = u.pfn05(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4]); break;
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390 | case 6: rcRet = u.pfn06(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5]); break;
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391 | case 7: rcRet = u.pfn07(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6]); break;
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392 | case 8: rcRet = u.pfn08(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7]); break;
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393 | case 9: rcRet = u.pfn09(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8]); break;
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394 | case 10: rcRet = u.pfn10(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9]); break;
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395 | case 11: rcRet = u.pfn11(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10]); break;
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396 | case 12: rcRet = u.pfn12(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11]); break;
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397 | default:
|
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398 | AssertReleaseMsgFailed(("cArgs=%d\n", pReq->u.Internal.cArgs));
|
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399 | rcRet = rcReq = VERR_INTERNAL_ERROR;
|
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400 | break;
|
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401 | }
|
---|
402 | #else /* RT_ARCH_X86 */
|
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403 | size_t cbArgs = pReq->u.Internal.cArgs * sizeof(uintptr_t);
|
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404 | # ifdef __GNUC__
|
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405 | __asm__ __volatile__("movl %%esp, %%edx\n\t"
|
---|
406 | "subl %2, %%esp\n\t"
|
---|
407 | "andl $0xfffffff0, %%esp\n\t"
|
---|
408 | "shrl $2, %2\n\t"
|
---|
409 | "movl %%esp, %%edi\n\t"
|
---|
410 | "rep movsl\n\t"
|
---|
411 | "movl %%edx, %%edi\n\t"
|
---|
412 | "call *%%eax\n\t"
|
---|
413 | "mov %%edi, %%esp\n\t"
|
---|
414 | : "=a" (rcRet),
|
---|
415 | "=S" (pauArgs),
|
---|
416 | "=c" (cbArgs)
|
---|
417 | : "0" (u.pfn),
|
---|
418 | "1" (pauArgs),
|
---|
419 | "2" (cbArgs)
|
---|
420 | : "edi", "edx");
|
---|
421 | # else
|
---|
422 | __asm
|
---|
423 | {
|
---|
424 | xor edx, edx /* just mess it up. */
|
---|
425 | mov eax, u.pfn
|
---|
426 | mov ecx, cbArgs
|
---|
427 | shr ecx, 2
|
---|
428 | mov esi, pauArgs
|
---|
429 | mov ebx, esp
|
---|
430 | sub esp, cbArgs
|
---|
431 | and esp, 0xfffffff0
|
---|
432 | mov edi, esp
|
---|
433 | rep movsd
|
---|
434 | call eax
|
---|
435 | mov esp, ebx
|
---|
436 | mov rcRet, eax
|
---|
437 | }
|
---|
438 | # endif
|
---|
439 | #endif /* RT_ARCH_X86 */
|
---|
440 | if ((pReq->fFlags & (RTREQFLAGS_RETURN_MASK)) == RTREQFLAGS_VOID)
|
---|
441 | rcRet = VINF_SUCCESS;
|
---|
442 | rcReq = rcRet;
|
---|
443 | break;
|
---|
444 | }
|
---|
445 |
|
---|
446 | default:
|
---|
447 | AssertMsgFailed(("pReq->enmType=%d\n", pReq->enmType));
|
---|
448 | rcReq = VERR_NOT_IMPLEMENTED;
|
---|
449 | break;
|
---|
450 | }
|
---|
451 |
|
---|
452 | /*
|
---|
453 | * Complete the request and then release our request handle reference.
|
---|
454 | */
|
---|
455 | pReq->iStatusX = rcReq;
|
---|
456 | pReq->enmState = RTREQSTATE_COMPLETED;
|
---|
457 | if (pReq->fFlags & RTREQFLAGS_NO_WAIT)
|
---|
458 | LogFlow(("rtReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc (no wait)\n",
|
---|
459 | pReq, rcReq, rcRet));
|
---|
460 | else
|
---|
461 | {
|
---|
462 | /* Notify the waiting thread. */
|
---|
463 | LogFlow(("rtReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - notifying waiting thread\n",
|
---|
464 | pReq, rcReq, rcRet));
|
---|
465 | ASMAtomicXchgSize(&pReq->fEventSemClear, false);
|
---|
466 | int rc2 = RTSemEventSignal(pReq->EventSem);
|
---|
467 | if (rc2 != VINF_SUCCESS)
|
---|
468 | {
|
---|
469 | AssertRC(rc2);
|
---|
470 | rcRet = rc2;
|
---|
471 | }
|
---|
472 | }
|
---|
473 | RTReqRelease(pReq);
|
---|
474 | return rcRet;
|
---|
475 | }
|
---|
476 |
|
---|