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annotate deps/Platinum/ThirdParty/Neptune/Source/Core/NptThreads.cpp @ 0:3425707ddbf6

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author fraserofthenight
date Mon, 06 Jul 2009 08:06:28 -0700
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1 /*****************************************************************
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2 |
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3 | Neptune - Threads
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4 |
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5 | Copyright (c) 2002-2008, Axiomatic Systems, LLC.
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6 | All rights reserved.
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7 |
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8 | Redistribution and use in source and binary forms, with or without
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9 | modification, are permitted provided that the following conditions are met:
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10 | * Redistributions of source code must retain the above copyright
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11 | notice, this list of conditions and the following disclaimer.
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12 | * Redistributions in binary form must reproduce the above copyright
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13 | notice, this list of conditions and the following disclaimer in the
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14 | documentation and/or other materials provided with the distribution.
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15 | * Neither the name of Axiomatic Systems nor the
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16 | names of its contributors may be used to endorse or promote products
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17 | derived from this software without specific prior written permission.
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18 |
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19 | THIS SOFTWARE IS PROVIDED BY AXIOMATIC SYSTEMS ''AS IS'' AND ANY
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20 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 | DISCLAIMED. IN NO EVENT SHALL AXIOMATIC SYSTEMS BE LIABLE FOR ANY
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23 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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24 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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25 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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26 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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27 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 |
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30 ****************************************************************/
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31
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32 /*----------------------------------------------------------------------
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33 | includes
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34 +---------------------------------------------------------------------*/
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35 #include "NptThreads.h"
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36
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37 /*----------------------------------------------------------------------
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38 | NPT_ThreadCallbackSlot::NPT_ThreadCallbackSlot
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39 +---------------------------------------------------------------------*/
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40 NPT_ThreadCallbackSlot::NPT_ThreadCallbackSlot() :
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41 m_CallbackArgs(NULL),
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42 m_Shutdown(false),
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43 m_NotificationHelper(NULL)
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44 {
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45 }
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46
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47 /*----------------------------------------------------------------------
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48 | NPT_ThreadCallbackSlot::Shutdown
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49 +---------------------------------------------------------------------*/
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50 NPT_Result
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51 NPT_ThreadCallbackSlot::Shutdown()
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52 {
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53 // protect against concurrent access
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54 //FIXME: This will not work if another Thread has called ReceiveCallback with a timeout
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55 NPT_AutoLock lock(m_ReadLock);
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56
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57 // signal we are shut down
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58 m_Shutdown = true;
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59
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60 // clear up any pending callbacks
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61 m_Pending.SetValue(0);
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62 m_Ack.SetValue(1);
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63
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64 return NPT_SUCCESS;
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65 }
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66
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67 /*----------------------------------------------------------------------
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68 | NPT_ThreadCallbackSlot::SetNotificationHelper
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69 +---------------------------------------------------------------------*/
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70 NPT_Result
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71 NPT_ThreadCallbackSlot::SetNotificationHelper(NotificationHelper* helper)
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72 {
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73 m_NotificationHelper = helper;
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74 return NPT_SUCCESS;
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75 }
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76
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77 /*----------------------------------------------------------------------
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78 | NPT_ThreadCallbackSlot::ReceiveCallback
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79 +---------------------------------------------------------------------*/
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80 NPT_Result
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81 NPT_ThreadCallbackSlot::ReceiveCallback(NPT_ThreadCallbackReceiver& receiver,
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82 NPT_Timeout timeout)
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83 {
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84 // protect against concurrent access
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85 //NPT_Debug("NPT_ThreadCallbackSlot::ReceiveCallback - read locking, timeout=%d\n", timeout);
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86 NPT_AutoLock lock(m_ReadLock);
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87
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88 if (timeout) {
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89 // wait until there is a pending callback
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90 //NPT_Debug("NPT_ThreadCallbackSlot::ReceiveCallback - waiting...\n");
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91 NPT_Result result = m_Pending.WaitUntilEquals(1, timeout);
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92 if (NPT_FAILED(result)) return result; // don't log here because the result
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93 // could be NPT_ERROR_TIMEOUT which
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94 // is an expected normal case.
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95 //NPT_Debug("NPT_ThreadCallbackSlot::ReceiveCallback - got it\n");
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96 } else {
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97 // see if something is pending
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98 if (m_Pending.GetValue() == 0) {
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99 //NPT_Debug("NPT_ThreadCallbackSlot::ReceiveCallback - nothing pending\n");
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100 return NPT_ERROR_CALLBACK_NOTHING_PENDING;
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101 }
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102 }
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103
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104 // check if we have been shutdown
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105 if (m_Shutdown) return NPT_ERROR_CALLBACK_HANDLER_SHUTDOWN;
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106
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107 // process the callback
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108 //NPT_Debug("NPT_ThreadCallbackSlot::ReceiveCallback - calling back\n");
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109 receiver.OnCallback(const_cast<void*>(m_CallbackArgs));
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110
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111 // signal that we've processed the callback
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112 m_Pending.SetValue(0);
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113 m_Ack.SetValue(1);
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114
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115 return NPT_SUCCESS;
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116 }
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117
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118 /*----------------------------------------------------------------------
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119 | NPT_ThreadCallbackSlot::SendCallback
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120 +---------------------------------------------------------------------*/
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121 NPT_Result
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122 NPT_ThreadCallbackSlot::SendCallback(void* args)
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123 {
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124 // protect against concurrent access
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125 //NPT_Debug("NPT_ThreadCallbackSlot::SendCallback - write locking\n");
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126 NPT_AutoLock lock(m_WriteLock);
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127
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128 // there should be nothing pending
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129 #if defined(NPT_DEBUG)
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130 NPT_ASSERT(m_Pending.GetValue() == 0);
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131 #endif
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132
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133 // check if we have been shutdown
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134 if (m_Shutdown) return NPT_ERROR_CALLBACK_HANDLER_SHUTDOWN;
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135
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136 // put the callback args
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137 m_CallbackArgs = args;
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138 //NPT_Debug("NPT_ThreadCallbackSlot::SendCallback - signalling\n");
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139 m_Pending.SetValue(1);
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140
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141 // call the helper before we wait
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142 if (m_NotificationHelper) {
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143 m_NotificationHelper->Notify();
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144 }
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145
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146 // wait until the callback has been process, or we've been shutdown
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147 //NPT_Debug("NPT_ThreadCallbackSlot::SendCallback - waiting...\n");
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148 m_Ack.WaitUntilEquals(1);
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149 //NPT_Debug("NPT_ThreadCallbackSlot::SendCallback - got it\n");
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150
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151 // done
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152 m_Ack.SetValue(0);
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153 m_CallbackArgs = NULL;
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154
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155 return m_Shutdown?NPT_ERROR_CALLBACK_HANDLER_SHUTDOWN:NPT_SUCCESS;
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156 }