1 | /* |
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2 | * tclUnixNotify.c -- |
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3 | * |
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4 | * This file contains the implementation of the select()-based |
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5 | * Unix-specific notifier, which is the lowest-level part of the Tcl |
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6 | * event loop. This file works together with generic/tclNotify.c. |
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7 | * |
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8 | * Copyright (c) 1995-1997 Sun Microsystems, Inc. |
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9 | * |
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10 | * See the file "license.terms" for information on usage and redistribution of |
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11 | * this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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12 | * |
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13 | * RCS: @(#) $Id: tclUnixNotfy.c,v 1.34 2008/03/11 22:23:50 das Exp $ |
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14 | */ |
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15 | |
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16 | #include "tclInt.h" |
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17 | #ifndef HAVE_COREFOUNDATION /* Darwin/Mac OS X CoreFoundation notifier is |
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18 | * in tclMacOSXNotify.c */ |
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19 | #include <signal.h> |
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20 | |
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21 | /* |
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22 | * This code does deep stub magic to allow replacement of the notifier at |
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23 | * runtime. |
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24 | */ |
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25 | |
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26 | extern TclStubs tclStubs; |
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27 | extern Tcl_NotifierProcs tclOriginalNotifier; |
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28 | |
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29 | /* |
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30 | * This structure is used to keep track of the notifier info for a registered |
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31 | * file. |
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32 | */ |
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33 | |
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34 | typedef struct FileHandler { |
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35 | int fd; |
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36 | int mask; /* Mask of desired events: TCL_READABLE, |
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37 | * etc. */ |
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38 | int readyMask; /* Mask of events that have been seen since |
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39 | * the last time file handlers were invoked |
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40 | * for this file. */ |
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41 | Tcl_FileProc *proc; /* Function to call, in the style of |
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42 | * Tcl_CreateFileHandler. */ |
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43 | ClientData clientData; /* Argument to pass to proc. */ |
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44 | struct FileHandler *nextPtr;/* Next in list of all files we care about. */ |
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45 | } FileHandler; |
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46 | |
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47 | /* |
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48 | * The following structure is what is added to the Tcl event queue when file |
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49 | * handlers are ready to fire. |
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50 | */ |
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51 | |
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52 | typedef struct FileHandlerEvent { |
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53 | Tcl_Event header; /* Information that is standard for all |
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54 | * events. */ |
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55 | int fd; /* File descriptor that is ready. Used to find |
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56 | * the FileHandler structure for the file |
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57 | * (can't point directly to the FileHandler |
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58 | * structure because it could go away while |
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59 | * the event is queued). */ |
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60 | } FileHandlerEvent; |
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61 | |
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62 | /* |
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63 | * The following structure contains a set of select() masks to track readable, |
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64 | * writable, and exceptional conditions. |
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65 | */ |
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66 | |
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67 | typedef struct SelectMasks { |
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68 | fd_set readable; |
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69 | fd_set writable; |
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70 | fd_set exceptional; |
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71 | } SelectMasks; |
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72 | |
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73 | /* |
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74 | * The following static structure contains the state information for the |
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75 | * select based implementation of the Tcl notifier. One of these structures is |
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76 | * created for each thread that is using the notifier. |
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77 | */ |
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78 | |
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79 | typedef struct ThreadSpecificData { |
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80 | FileHandler *firstFileHandlerPtr; |
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81 | /* Pointer to head of file handler list. */ |
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82 | SelectMasks checkMasks; /* This structure is used to build up the |
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83 | * masks to be used in the next call to |
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84 | * select. Bits are set in response to calls |
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85 | * to Tcl_CreateFileHandler. */ |
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86 | SelectMasks readyMasks; /* This array reflects the readable/writable |
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87 | * conditions that were found to exist by the |
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88 | * last call to select. */ |
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89 | int numFdBits; /* Number of valid bits in checkMasks (one |
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90 | * more than highest fd for which |
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91 | * Tcl_WatchFile has been called). */ |
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92 | #ifdef TCL_THREADS |
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93 | int onList; /* True if it is in this list */ |
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94 | unsigned int pollState; /* pollState is used to implement a polling |
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95 | * handshake between each thread and the |
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96 | * notifier thread. Bits defined below. */ |
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97 | struct ThreadSpecificData *nextPtr, *prevPtr; |
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98 | /* All threads that are currently waiting on |
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99 | * an event have their ThreadSpecificData |
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100 | * structure on a doubly-linked listed formed |
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101 | * from these pointers. You must hold the |
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102 | * notifierMutex lock before accessing these |
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103 | * fields. */ |
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104 | Tcl_Condition waitCV; /* Any other thread alerts a notifier that an |
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105 | * event is ready to be processed by signaling |
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106 | * this condition variable. */ |
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107 | int eventReady; /* True if an event is ready to be processed. |
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108 | * Used as condition flag together with waitCV |
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109 | * above. */ |
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110 | #endif |
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111 | } ThreadSpecificData; |
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112 | |
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113 | static Tcl_ThreadDataKey dataKey; |
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114 | |
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115 | #ifdef TCL_THREADS |
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116 | /* |
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117 | * The following static indicates the number of threads that have initialized |
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118 | * notifiers. |
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119 | * |
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120 | * You must hold the notifierMutex lock before accessing this variable. |
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121 | */ |
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122 | |
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123 | static int notifierCount = 0; |
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124 | |
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125 | /* |
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126 | * The following variable points to the head of a doubly-linked list of |
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127 | * ThreadSpecificData structures for all threads that are currently waiting on |
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128 | * an event. |
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129 | * |
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130 | * You must hold the notifierMutex lock before accessing this list. |
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131 | */ |
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132 | |
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133 | static ThreadSpecificData *waitingListPtr = NULL; |
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134 | |
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135 | /* |
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136 | * The notifier thread spends all its time in select() waiting for a file |
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137 | * descriptor associated with one of the threads on the waitingListPtr list to |
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138 | * do something interesting. But if the contents of the waitingListPtr list |
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139 | * ever changes, we need to wake up and restart the select() system call. You |
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140 | * can wake up the notifier thread by writing a single byte to the file |
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141 | * descriptor defined below. This file descriptor is the input-end of a pipe |
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142 | * and the notifier thread is listening for data on the output-end of the same |
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143 | * pipe. Hence writing to this file descriptor will cause the select() system |
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144 | * call to return and wake up the notifier thread. |
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145 | * |
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146 | * You must hold the notifierMutex lock before accessing this list. |
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147 | */ |
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148 | |
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149 | static int triggerPipe = -1; |
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150 | |
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151 | /* |
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152 | * The notifierMutex locks access to all of the global notifier state. |
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153 | */ |
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154 | |
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155 | TCL_DECLARE_MUTEX(notifierMutex) |
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156 | |
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157 | /* |
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158 | * The notifier thread signals the notifierCV when it has finished |
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159 | * initializing the triggerPipe and right before the notifier thread |
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160 | * terminates. |
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161 | */ |
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162 | |
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163 | static Tcl_Condition notifierCV; |
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164 | |
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165 | /* |
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166 | * The pollState bits |
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167 | * POLL_WANT is set by each thread before it waits on its condition |
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168 | * variable. It is checked by the notifier before it does select. |
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169 | * POLL_DONE is set by the notifier if it goes into select after seeing |
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170 | * POLL_WANT. The idea is to ensure it tries a select with the |
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171 | * same bits the initial thread had set. |
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172 | */ |
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173 | |
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174 | #define POLL_WANT 0x1 |
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175 | #define POLL_DONE 0x2 |
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176 | |
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177 | /* |
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178 | * This is the thread ID of the notifier thread that does select. |
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179 | */ |
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180 | |
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181 | static Tcl_ThreadId notifierThread; |
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182 | |
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183 | #endif |
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184 | |
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185 | /* |
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186 | * Static routines defined in this file. |
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187 | */ |
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188 | |
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189 | #ifdef TCL_THREADS |
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190 | static void NotifierThreadProc(ClientData clientData); |
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191 | #endif |
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192 | static int FileHandlerEventProc(Tcl_Event *evPtr, int flags); |
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193 | |
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194 | /* |
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195 | *---------------------------------------------------------------------- |
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196 | * |
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197 | * Tcl_InitNotifier -- |
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198 | * |
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199 | * Initializes the platform specific notifier state. |
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200 | * |
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201 | * Results: |
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202 | * Returns a handle to the notifier state for this thread.. |
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203 | * |
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204 | * Side effects: |
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205 | * None. |
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206 | * |
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207 | *---------------------------------------------------------------------- |
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208 | */ |
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209 | |
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210 | ClientData |
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211 | Tcl_InitNotifier(void) |
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212 | { |
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213 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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214 | |
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215 | #ifdef TCL_THREADS |
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216 | tsdPtr->eventReady = 0; |
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217 | |
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218 | /* |
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219 | * Start the Notifier thread if necessary. |
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220 | */ |
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221 | |
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222 | Tcl_MutexLock(¬ifierMutex); |
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223 | if (notifierCount == 0) { |
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224 | if (TclpThreadCreate(¬ifierThread, NotifierThreadProc, NULL, |
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225 | TCL_THREAD_STACK_DEFAULT, TCL_THREAD_JOINABLE) != TCL_OK) { |
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226 | Tcl_Panic("Tcl_InitNotifier: unable to start notifier thread"); |
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227 | } |
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228 | } |
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229 | notifierCount++; |
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230 | |
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231 | /* |
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232 | * Wait for the notifier pipe to be created. |
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233 | */ |
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234 | |
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235 | while (triggerPipe < 0) { |
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236 | Tcl_ConditionWait(¬ifierCV, ¬ifierMutex, NULL); |
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237 | } |
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238 | |
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239 | Tcl_MutexUnlock(¬ifierMutex); |
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240 | #endif |
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241 | return (ClientData) tsdPtr; |
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242 | } |
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243 | |
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244 | /* |
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245 | *---------------------------------------------------------------------- |
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246 | * |
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247 | * Tcl_FinalizeNotifier -- |
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248 | * |
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249 | * This function is called to cleanup the notifier state before a thread |
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250 | * is terminated. |
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251 | * |
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252 | * Results: |
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253 | * None. |
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254 | * |
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255 | * Side effects: |
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256 | * May terminate the background notifier thread if this is the last |
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257 | * notifier instance. |
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258 | * |
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259 | *---------------------------------------------------------------------- |
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260 | */ |
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261 | |
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262 | void |
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263 | Tcl_FinalizeNotifier( |
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264 | ClientData clientData) /* Not used. */ |
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265 | { |
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266 | #ifdef TCL_THREADS |
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267 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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268 | |
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269 | Tcl_MutexLock(¬ifierMutex); |
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270 | notifierCount--; |
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271 | |
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272 | /* |
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273 | * If this is the last thread to use the notifier, close the notifier pipe |
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274 | * and wait for the background thread to terminate. |
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275 | */ |
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276 | |
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277 | if (notifierCount == 0) { |
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278 | int result; |
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279 | |
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280 | if (triggerPipe < 0) { |
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281 | Tcl_Panic("Tcl_FinalizeNotifier: notifier pipe not initialized"); |
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282 | } |
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283 | |
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284 | /* |
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285 | * Send "q" message to the notifier thread so that it will terminate. |
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286 | * The notifier will return from its call to select() and notice that |
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287 | * a "q" message has arrived, it will then close its side of the pipe |
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288 | * and terminate its thread. Note the we can not just close the pipe |
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289 | * and check for EOF in the notifier thread because if a background |
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290 | * child process was created with exec, select() would not register |
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291 | * the EOF on the pipe until the child processes had terminated. [Bug: |
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292 | * 4139] [Bug: 1222872] |
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293 | */ |
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294 | |
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295 | write(triggerPipe, "q", 1); |
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296 | close(triggerPipe); |
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297 | while(triggerPipe >= 0) { |
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298 | Tcl_ConditionWait(¬ifierCV, ¬ifierMutex, NULL); |
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299 | } |
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300 | |
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301 | result = Tcl_JoinThread(notifierThread, NULL); |
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302 | if (result) { |
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303 | Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier thread"); |
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304 | } |
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305 | } |
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306 | |
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307 | /* |
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308 | * Clean up any synchronization objects in the thread local storage. |
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309 | */ |
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310 | |
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311 | Tcl_ConditionFinalize(&(tsdPtr->waitCV)); |
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312 | |
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313 | Tcl_MutexUnlock(¬ifierMutex); |
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314 | #endif |
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315 | } |
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316 | |
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317 | /* |
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318 | *---------------------------------------------------------------------- |
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319 | * |
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320 | * Tcl_AlertNotifier -- |
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321 | * |
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322 | * Wake up the specified notifier from any thread. This routine is called |
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323 | * by the platform independent notifier code whenever the Tcl_ThreadAlert |
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324 | * routine is called. This routine is guaranteed not to be called on a |
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325 | * given notifier after Tcl_FinalizeNotifier is called for that notifier. |
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326 | * |
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327 | * Results: |
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328 | * None. |
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329 | * |
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330 | * Side effects: |
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331 | * Signals the notifier condition variable for the specified notifier. |
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332 | * |
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333 | *---------------------------------------------------------------------- |
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334 | */ |
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335 | |
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336 | void |
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337 | Tcl_AlertNotifier( |
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338 | ClientData clientData) |
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339 | { |
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340 | #ifdef TCL_THREADS |
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341 | ThreadSpecificData *tsdPtr = (ThreadSpecificData *) clientData; |
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342 | Tcl_MutexLock(¬ifierMutex); |
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343 | tsdPtr->eventReady = 1; |
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344 | Tcl_ConditionNotify(&tsdPtr->waitCV); |
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345 | Tcl_MutexUnlock(¬ifierMutex); |
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346 | #endif |
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347 | } |
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348 | |
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349 | /* |
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350 | *---------------------------------------------------------------------- |
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351 | * |
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352 | * Tcl_SetTimer -- |
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353 | * |
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354 | * This function sets the current notifier timer value. This interface is |
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355 | * not implemented in this notifier because we are always running inside |
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356 | * of Tcl_DoOneEvent. |
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357 | * |
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358 | * Results: |
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359 | * None. |
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360 | * |
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361 | * Side effects: |
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362 | * None. |
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363 | * |
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364 | *---------------------------------------------------------------------- |
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365 | */ |
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366 | |
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367 | void |
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368 | Tcl_SetTimer( |
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369 | Tcl_Time *timePtr) /* Timeout value, may be NULL. */ |
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370 | { |
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371 | /* |
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372 | * The interval timer doesn't do anything in this implementation, because |
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373 | * the only event loop is via Tcl_DoOneEvent, which passes timeout values |
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374 | * to Tcl_WaitForEvent. |
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375 | */ |
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376 | |
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377 | if (tclStubs.tcl_SetTimer != tclOriginalNotifier.setTimerProc) { |
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378 | tclStubs.tcl_SetTimer(timePtr); |
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379 | } |
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380 | } |
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381 | |
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382 | /* |
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383 | *---------------------------------------------------------------------- |
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384 | * |
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385 | * Tcl_ServiceModeHook -- |
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386 | * |
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387 | * This function is invoked whenever the service mode changes. |
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388 | * |
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389 | * Results: |
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390 | * None. |
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391 | * |
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392 | * Side effects: |
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393 | * None. |
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394 | * |
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395 | *---------------------------------------------------------------------- |
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396 | */ |
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397 | |
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398 | void |
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399 | Tcl_ServiceModeHook( |
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400 | int mode) /* Either TCL_SERVICE_ALL, or |
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401 | * TCL_SERVICE_NONE. */ |
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402 | { |
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403 | } |
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404 | |
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405 | /* |
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406 | *---------------------------------------------------------------------- |
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407 | * |
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408 | * Tcl_CreateFileHandler -- |
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409 | * |
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410 | * This function registers a file handler with the select notifier. |
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411 | * |
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412 | * Results: |
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413 | * None. |
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414 | * |
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415 | * Side effects: |
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416 | * Creates a new file handler structure. |
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417 | * |
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418 | *---------------------------------------------------------------------- |
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419 | */ |
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420 | |
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421 | void |
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422 | Tcl_CreateFileHandler( |
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423 | int fd, /* Handle of stream to watch. */ |
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424 | int mask, /* OR'ed combination of TCL_READABLE, |
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425 | * TCL_WRITABLE, and TCL_EXCEPTION: indicates |
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426 | * conditions under which proc should be |
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427 | * called. */ |
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428 | Tcl_FileProc *proc, /* Function to call for each selected |
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429 | * event. */ |
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430 | ClientData clientData) /* Arbitrary data to pass to proc. */ |
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431 | { |
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432 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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433 | FileHandler *filePtr; |
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434 | |
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435 | if (tclStubs.tcl_CreateFileHandler != |
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436 | tclOriginalNotifier.createFileHandlerProc) { |
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437 | tclStubs.tcl_CreateFileHandler(fd, mask, proc, clientData); |
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438 | return; |
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439 | } |
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440 | |
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441 | for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL; |
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442 | filePtr = filePtr->nextPtr) { |
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443 | if (filePtr->fd == fd) { |
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444 | break; |
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445 | } |
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446 | } |
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447 | if (filePtr == NULL) { |
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448 | filePtr = (FileHandler*) ckalloc(sizeof(FileHandler)); |
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449 | filePtr->fd = fd; |
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450 | filePtr->readyMask = 0; |
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451 | filePtr->nextPtr = tsdPtr->firstFileHandlerPtr; |
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452 | tsdPtr->firstFileHandlerPtr = filePtr; |
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453 | } |
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454 | filePtr->proc = proc; |
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455 | filePtr->clientData = clientData; |
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456 | filePtr->mask = mask; |
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457 | |
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458 | /* |
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459 | * Update the check masks for this file. |
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460 | */ |
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461 | |
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462 | if (mask & TCL_READABLE) { |
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463 | FD_SET(fd, &(tsdPtr->checkMasks.readable)); |
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464 | } else { |
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465 | FD_CLR(fd, &(tsdPtr->checkMasks.readable)); |
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466 | } |
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467 | if (mask & TCL_WRITABLE) { |
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468 | FD_SET(fd, &(tsdPtr->checkMasks.writable)); |
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469 | } else { |
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470 | FD_CLR(fd, &(tsdPtr->checkMasks.writable)); |
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471 | } |
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472 | if (mask & TCL_EXCEPTION) { |
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473 | FD_SET(fd, &(tsdPtr->checkMasks.exceptional)); |
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474 | } else { |
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475 | FD_CLR(fd, &(tsdPtr->checkMasks.exceptional)); |
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476 | } |
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477 | if (tsdPtr->numFdBits <= fd) { |
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478 | tsdPtr->numFdBits = fd+1; |
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479 | } |
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480 | } |
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481 | |
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482 | /* |
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483 | *---------------------------------------------------------------------- |
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484 | * |
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485 | * Tcl_DeleteFileHandler -- |
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486 | * |
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487 | * Cancel a previously-arranged callback arrangement for a file. |
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488 | * |
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489 | * Results: |
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490 | * None. |
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491 | * |
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492 | * Side effects: |
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493 | * If a callback was previously registered on file, remove it. |
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494 | * |
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495 | *---------------------------------------------------------------------- |
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496 | */ |
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497 | |
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498 | void |
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499 | Tcl_DeleteFileHandler( |
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500 | int fd) /* Stream id for which to remove callback |
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501 | * function. */ |
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502 | { |
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503 | FileHandler *filePtr, *prevPtr; |
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504 | int i; |
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505 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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506 | |
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507 | if (tclStubs.tcl_DeleteFileHandler != |
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508 | tclOriginalNotifier.deleteFileHandlerProc) { |
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509 | tclStubs.tcl_DeleteFileHandler(fd); |
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510 | return; |
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511 | } |
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512 | |
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513 | /* |
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514 | * Find the entry for the given file (and return if there isn't one). |
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515 | */ |
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516 | |
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517 | for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ; |
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518 | prevPtr = filePtr, filePtr = filePtr->nextPtr) { |
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519 | if (filePtr == NULL) { |
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520 | return; |
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521 | } |
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522 | if (filePtr->fd == fd) { |
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523 | break; |
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524 | } |
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525 | } |
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526 | |
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527 | /* |
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528 | * Update the check masks for this file. |
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529 | */ |
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530 | |
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531 | if (filePtr->mask & TCL_READABLE) { |
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532 | FD_CLR(fd, &(tsdPtr->checkMasks.readable)); |
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533 | } |
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534 | if (filePtr->mask & TCL_WRITABLE) { |
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535 | FD_CLR(fd, &(tsdPtr->checkMasks.writable)); |
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536 | } |
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537 | if (filePtr->mask & TCL_EXCEPTION) { |
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538 | FD_CLR(fd, &(tsdPtr->checkMasks.exceptional)); |
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539 | } |
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540 | |
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541 | /* |
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542 | * Find current max fd. |
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543 | */ |
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544 | |
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545 | if (fd+1 == tsdPtr->numFdBits) { |
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546 | tsdPtr->numFdBits = 0; |
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547 | for (i = fd-1; i >= 0; i--) { |
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548 | if (FD_ISSET(i, &(tsdPtr->checkMasks.readable)) |
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549 | || FD_ISSET(i, &(tsdPtr->checkMasks.writable)) |
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550 | || FD_ISSET(i, &(tsdPtr->checkMasks.exceptional))) { |
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551 | tsdPtr->numFdBits = i+1; |
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552 | break; |
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553 | } |
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554 | } |
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555 | } |
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556 | |
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557 | /* |
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558 | * Clean up information in the callback record. |
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559 | */ |
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560 | |
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561 | if (prevPtr == NULL) { |
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562 | tsdPtr->firstFileHandlerPtr = filePtr->nextPtr; |
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563 | } else { |
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564 | prevPtr->nextPtr = filePtr->nextPtr; |
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565 | } |
---|
566 | ckfree((char *) filePtr); |
---|
567 | } |
---|
568 | |
---|
569 | /* |
---|
570 | *---------------------------------------------------------------------- |
---|
571 | * |
---|
572 | * FileHandlerEventProc -- |
---|
573 | * |
---|
574 | * This function is called by Tcl_ServiceEvent when a file event reaches |
---|
575 | * the front of the event queue. This function is responsible for |
---|
576 | * actually handling the event by invoking the callback for the file |
---|
577 | * handler. |
---|
578 | * |
---|
579 | * Results: |
---|
580 | * Returns 1 if the event was handled, meaning it should be removed from |
---|
581 | * the queue. Returns 0 if the event was not handled, meaning it should |
---|
582 | * stay on the queue. The only time the event isn't handled is if the |
---|
583 | * TCL_FILE_EVENTS flag bit isn't set. |
---|
584 | * |
---|
585 | * Side effects: |
---|
586 | * Whatever the file handler's callback function does. |
---|
587 | * |
---|
588 | *---------------------------------------------------------------------- |
---|
589 | */ |
---|
590 | |
---|
591 | static int |
---|
592 | FileHandlerEventProc( |
---|
593 | Tcl_Event *evPtr, /* Event to service. */ |
---|
594 | int flags) /* Flags that indicate what events to handle, |
---|
595 | * such as TCL_FILE_EVENTS. */ |
---|
596 | { |
---|
597 | int mask; |
---|
598 | FileHandler *filePtr; |
---|
599 | FileHandlerEvent *fileEvPtr = (FileHandlerEvent *) evPtr; |
---|
600 | ThreadSpecificData *tsdPtr; |
---|
601 | |
---|
602 | if (!(flags & TCL_FILE_EVENTS)) { |
---|
603 | return 0; |
---|
604 | } |
---|
605 | |
---|
606 | /* |
---|
607 | * Search through the file handlers to find the one whose handle matches |
---|
608 | * the event. We do this rather than keeping a pointer to the file handler |
---|
609 | * directly in the event, so that the handler can be deleted while the |
---|
610 | * event is queued without leaving a dangling pointer. |
---|
611 | */ |
---|
612 | |
---|
613 | tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
614 | for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL; |
---|
615 | filePtr = filePtr->nextPtr) { |
---|
616 | if (filePtr->fd != fileEvPtr->fd) { |
---|
617 | continue; |
---|
618 | } |
---|
619 | |
---|
620 | /* |
---|
621 | * The code is tricky for two reasons: |
---|
622 | * 1. The file handler's desired events could have changed since the |
---|
623 | * time when the event was queued, so AND the ready mask with the |
---|
624 | * desired mask. |
---|
625 | * 2. The file could have been closed and re-opened since the time |
---|
626 | * when the event was queued. This is why the ready mask is stored |
---|
627 | * in the file handler rather than the queued event: it will be |
---|
628 | * zeroed when a new file handler is created for the newly opened |
---|
629 | * file. |
---|
630 | */ |
---|
631 | |
---|
632 | mask = filePtr->readyMask & filePtr->mask; |
---|
633 | filePtr->readyMask = 0; |
---|
634 | if (mask != 0) { |
---|
635 | (*filePtr->proc)(filePtr->clientData, mask); |
---|
636 | } |
---|
637 | break; |
---|
638 | } |
---|
639 | return 1; |
---|
640 | } |
---|
641 | |
---|
642 | /* |
---|
643 | *---------------------------------------------------------------------- |
---|
644 | * |
---|
645 | * Tcl_WaitForEvent -- |
---|
646 | * |
---|
647 | * This function is called by Tcl_DoOneEvent to wait for new events on |
---|
648 | * the message queue. If the block time is 0, then Tcl_WaitForEvent just |
---|
649 | * polls without blocking. |
---|
650 | * |
---|
651 | * Results: |
---|
652 | * Returns -1 if the select would block forever, otherwise returns 0. |
---|
653 | * |
---|
654 | * Side effects: |
---|
655 | * Queues file events that are detected by the select. |
---|
656 | * |
---|
657 | *---------------------------------------------------------------------- |
---|
658 | */ |
---|
659 | |
---|
660 | int |
---|
661 | Tcl_WaitForEvent( |
---|
662 | Tcl_Time *timePtr) /* Maximum block time, or NULL. */ |
---|
663 | { |
---|
664 | FileHandler *filePtr; |
---|
665 | FileHandlerEvent *fileEvPtr; |
---|
666 | int mask; |
---|
667 | Tcl_Time myTime; |
---|
668 | #ifdef TCL_THREADS |
---|
669 | int waitForFiles; |
---|
670 | Tcl_Time *myTimePtr; |
---|
671 | #else |
---|
672 | /* |
---|
673 | * Impl. notes: timeout & timeoutPtr are used if, and only if threads are |
---|
674 | * not enabled. They are the arguments for the regular select() used when |
---|
675 | * the core is not thread-enabled. |
---|
676 | */ |
---|
677 | |
---|
678 | struct timeval timeout, *timeoutPtr; |
---|
679 | int numFound; |
---|
680 | #endif /* TCL_THREADS */ |
---|
681 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
682 | |
---|
683 | if (tclStubs.tcl_WaitForEvent != tclOriginalNotifier.waitForEventProc) { |
---|
684 | return tclStubs.tcl_WaitForEvent(timePtr); |
---|
685 | } |
---|
686 | |
---|
687 | /* |
---|
688 | * Set up the timeout structure. Note that if there are no events to check |
---|
689 | * for, we return with a negative result rather than blocking forever. |
---|
690 | */ |
---|
691 | |
---|
692 | if (timePtr != NULL) { |
---|
693 | /* |
---|
694 | * TIP #233 (Virtualized Time). Is virtual time in effect? And do we |
---|
695 | * actually have something to scale? If yes to both then we call the |
---|
696 | * handler to do this scaling. |
---|
697 | */ |
---|
698 | |
---|
699 | myTime.sec = timePtr->sec; |
---|
700 | myTime.usec = timePtr->usec; |
---|
701 | |
---|
702 | if (myTime.sec != 0 || myTime.usec != 0) { |
---|
703 | (*tclScaleTimeProcPtr) (&myTime, tclTimeClientData); |
---|
704 | } |
---|
705 | |
---|
706 | #ifdef TCL_THREADS |
---|
707 | myTimePtr = &myTime; |
---|
708 | #else |
---|
709 | timeout.tv_sec = myTime.sec; |
---|
710 | timeout.tv_usec = myTime.usec; |
---|
711 | timeoutPtr = &timeout; |
---|
712 | #endif /* TCL_THREADS */ |
---|
713 | |
---|
714 | #ifndef TCL_THREADS |
---|
715 | } else if (tsdPtr->numFdBits == 0) { |
---|
716 | /* |
---|
717 | * If there are no threads, no timeout, and no fds registered, then |
---|
718 | * there are no events possible and we must avoid deadlock. Note that |
---|
719 | * this is not entirely correct because there might be a signal that |
---|
720 | * could interrupt the select call, but we don't handle that case if |
---|
721 | * we aren't using threads. |
---|
722 | */ |
---|
723 | |
---|
724 | return -1; |
---|
725 | #endif /* !TCL_THREADS */ |
---|
726 | } else { |
---|
727 | #ifdef TCL_THREADS |
---|
728 | myTimePtr = NULL; |
---|
729 | #else |
---|
730 | timeoutPtr = NULL; |
---|
731 | #endif /* TCL_THREADS */ |
---|
732 | } |
---|
733 | |
---|
734 | #ifdef TCL_THREADS |
---|
735 | /* |
---|
736 | * Place this thread on the list of interested threads, signal the |
---|
737 | * notifier thread, and wait for a response or a timeout. |
---|
738 | */ |
---|
739 | |
---|
740 | Tcl_MutexLock(¬ifierMutex); |
---|
741 | |
---|
742 | waitForFiles = (tsdPtr->numFdBits > 0); |
---|
743 | if (myTimePtr != NULL && myTimePtr->sec == 0 && (myTimePtr->usec == 0 |
---|
744 | #if defined(__APPLE__) && defined(__LP64__) |
---|
745 | /* |
---|
746 | * On 64-bit Darwin, pthread_cond_timedwait() appears to have a bug |
---|
747 | * that causes it to wait forever when passed an absolute time which |
---|
748 | * has already been exceeded by the system time; as a workaround, |
---|
749 | * when given a very brief timeout, just do a poll. [Bug 1457797] |
---|
750 | */ |
---|
751 | || myTimePtr->usec < 10 |
---|
752 | #endif |
---|
753 | )) { |
---|
754 | /* |
---|
755 | * Cannot emulate a polling select with a polling condition variable. |
---|
756 | * Instead, pretend to wait for files and tell the notifier thread |
---|
757 | * what we are doing. The notifier thread makes sure it goes through |
---|
758 | * select with its select mask in the same state as ours currently is. |
---|
759 | * We block until that happens. |
---|
760 | */ |
---|
761 | |
---|
762 | waitForFiles = 1; |
---|
763 | tsdPtr->pollState = POLL_WANT; |
---|
764 | myTimePtr = NULL; |
---|
765 | } else { |
---|
766 | tsdPtr->pollState = 0; |
---|
767 | } |
---|
768 | |
---|
769 | if (waitForFiles) { |
---|
770 | /* |
---|
771 | * Add the ThreadSpecificData structure of this thread to the list of |
---|
772 | * ThreadSpecificData structures of all threads that are waiting on |
---|
773 | * file events. |
---|
774 | */ |
---|
775 | |
---|
776 | tsdPtr->nextPtr = waitingListPtr; |
---|
777 | if (waitingListPtr) { |
---|
778 | waitingListPtr->prevPtr = tsdPtr; |
---|
779 | } |
---|
780 | tsdPtr->prevPtr = 0; |
---|
781 | waitingListPtr = tsdPtr; |
---|
782 | tsdPtr->onList = 1; |
---|
783 | |
---|
784 | write(triggerPipe, "", 1); |
---|
785 | } |
---|
786 | |
---|
787 | FD_ZERO(&(tsdPtr->readyMasks.readable)); |
---|
788 | FD_ZERO(&(tsdPtr->readyMasks.writable)); |
---|
789 | FD_ZERO(&(tsdPtr->readyMasks.exceptional)); |
---|
790 | |
---|
791 | if (!tsdPtr->eventReady) { |
---|
792 | Tcl_ConditionWait(&tsdPtr->waitCV, ¬ifierMutex, myTimePtr); |
---|
793 | } |
---|
794 | tsdPtr->eventReady = 0; |
---|
795 | |
---|
796 | if (waitForFiles && tsdPtr->onList) { |
---|
797 | /* |
---|
798 | * Remove the ThreadSpecificData structure of this thread from the |
---|
799 | * waiting list. Alert the notifier thread to recompute its select |
---|
800 | * masks - skipping this caused a hang when trying to close a pipe |
---|
801 | * which the notifier thread was still doing a select on. |
---|
802 | */ |
---|
803 | |
---|
804 | if (tsdPtr->prevPtr) { |
---|
805 | tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr; |
---|
806 | } else { |
---|
807 | waitingListPtr = tsdPtr->nextPtr; |
---|
808 | } |
---|
809 | if (tsdPtr->nextPtr) { |
---|
810 | tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr; |
---|
811 | } |
---|
812 | tsdPtr->nextPtr = tsdPtr->prevPtr = NULL; |
---|
813 | tsdPtr->onList = 0; |
---|
814 | write(triggerPipe, "", 1); |
---|
815 | } |
---|
816 | |
---|
817 | #else |
---|
818 | tsdPtr->readyMasks = tsdPtr->checkMasks; |
---|
819 | numFound = select(tsdPtr->numFdBits, &(tsdPtr->readyMasks.readable), |
---|
820 | &(tsdPtr->readyMasks.writable), &(tsdPtr->readyMasks.exceptional), |
---|
821 | timeoutPtr); |
---|
822 | |
---|
823 | /* |
---|
824 | * Some systems don't clear the masks after an error, so we have to do it |
---|
825 | * here. |
---|
826 | */ |
---|
827 | |
---|
828 | if (numFound == -1) { |
---|
829 | FD_ZERO(&(tsdPtr->readyMasks.readable)); |
---|
830 | FD_ZERO(&(tsdPtr->readyMasks.writable)); |
---|
831 | FD_ZERO(&(tsdPtr->readyMasks.exceptional)); |
---|
832 | } |
---|
833 | #endif /* TCL_THREADS */ |
---|
834 | |
---|
835 | /* |
---|
836 | * Queue all detected file events before returning. |
---|
837 | */ |
---|
838 | |
---|
839 | for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL); |
---|
840 | filePtr = filePtr->nextPtr) { |
---|
841 | |
---|
842 | mask = 0; |
---|
843 | if (FD_ISSET(filePtr->fd, &(tsdPtr->readyMasks.readable))) { |
---|
844 | mask |= TCL_READABLE; |
---|
845 | } |
---|
846 | if (FD_ISSET(filePtr->fd, &(tsdPtr->readyMasks.writable))) { |
---|
847 | mask |= TCL_WRITABLE; |
---|
848 | } |
---|
849 | if (FD_ISSET(filePtr->fd, &(tsdPtr->readyMasks.exceptional))) { |
---|
850 | mask |= TCL_EXCEPTION; |
---|
851 | } |
---|
852 | |
---|
853 | if (!mask) { |
---|
854 | continue; |
---|
855 | } |
---|
856 | |
---|
857 | /* |
---|
858 | * Don't bother to queue an event if the mask was previously non-zero |
---|
859 | * since an event must still be on the queue. |
---|
860 | */ |
---|
861 | |
---|
862 | if (filePtr->readyMask == 0) { |
---|
863 | fileEvPtr = (FileHandlerEvent *) ckalloc(sizeof(FileHandlerEvent)); |
---|
864 | fileEvPtr->header.proc = FileHandlerEventProc; |
---|
865 | fileEvPtr->fd = filePtr->fd; |
---|
866 | Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL); |
---|
867 | } |
---|
868 | filePtr->readyMask = mask; |
---|
869 | } |
---|
870 | #ifdef TCL_THREADS |
---|
871 | Tcl_MutexUnlock(¬ifierMutex); |
---|
872 | #endif /* TCL_THREADS */ |
---|
873 | return 0; |
---|
874 | } |
---|
875 | |
---|
876 | #ifdef TCL_THREADS |
---|
877 | /* |
---|
878 | *---------------------------------------------------------------------- |
---|
879 | * |
---|
880 | * NotifierThreadProc -- |
---|
881 | * |
---|
882 | * This routine is the initial (and only) function executed by the |
---|
883 | * special notifier thread. Its job is to wait for file descriptors to |
---|
884 | * become readable or writable or to have an exception condition and then |
---|
885 | * to notify other threads who are interested in this information by |
---|
886 | * signalling a condition variable. Other threads can signal this |
---|
887 | * notifier thread of a change in their interests by writing a single |
---|
888 | * byte to a special pipe that the notifier thread is monitoring. |
---|
889 | * |
---|
890 | * Result: |
---|
891 | * None. Once started, this routine never exits. It dies with the overall |
---|
892 | * process. |
---|
893 | * |
---|
894 | * Side effects: |
---|
895 | * The trigger pipe used to signal the notifier thread is created when |
---|
896 | * the notifier thread first starts. |
---|
897 | * |
---|
898 | *---------------------------------------------------------------------- |
---|
899 | */ |
---|
900 | |
---|
901 | static void |
---|
902 | NotifierThreadProc( |
---|
903 | ClientData clientData) /* Not used. */ |
---|
904 | { |
---|
905 | ThreadSpecificData *tsdPtr; |
---|
906 | fd_set readableMask; |
---|
907 | fd_set writableMask; |
---|
908 | fd_set exceptionalMask; |
---|
909 | int fds[2]; |
---|
910 | int i, numFdBits = 0, receivePipe; |
---|
911 | long found; |
---|
912 | struct timeval poll = {0., 0.}, *timePtr; |
---|
913 | char buf[2]; |
---|
914 | |
---|
915 | if (pipe(fds) != 0) { |
---|
916 | Tcl_Panic("NotifierThreadProc: could not create trigger pipe"); |
---|
917 | } |
---|
918 | |
---|
919 | receivePipe = fds[0]; |
---|
920 | |
---|
921 | if (TclUnixSetBlockingMode(receivePipe, TCL_MODE_NONBLOCKING) < 0) { |
---|
922 | Tcl_Panic("NotifierThreadProc: could not make receive pipe non blocking"); |
---|
923 | } |
---|
924 | if (TclUnixSetBlockingMode(fds[1], TCL_MODE_NONBLOCKING) < 0) { |
---|
925 | Tcl_Panic("NotifierThreadProc: could not make trigger pipe non blocking"); |
---|
926 | } |
---|
927 | |
---|
928 | /* |
---|
929 | * Install the write end of the pipe into the global variable. |
---|
930 | */ |
---|
931 | |
---|
932 | Tcl_MutexLock(¬ifierMutex); |
---|
933 | triggerPipe = fds[1]; |
---|
934 | |
---|
935 | /* |
---|
936 | * Signal any threads that are waiting. |
---|
937 | */ |
---|
938 | |
---|
939 | Tcl_ConditionNotify(¬ifierCV); |
---|
940 | Tcl_MutexUnlock(¬ifierMutex); |
---|
941 | |
---|
942 | /* |
---|
943 | * Look for file events and report them to interested threads. |
---|
944 | */ |
---|
945 | |
---|
946 | while (1) { |
---|
947 | FD_ZERO(&readableMask); |
---|
948 | FD_ZERO(&writableMask); |
---|
949 | FD_ZERO(&exceptionalMask); |
---|
950 | |
---|
951 | /* |
---|
952 | * Compute the logical OR of the select masks from all the waiting |
---|
953 | * notifiers. |
---|
954 | */ |
---|
955 | |
---|
956 | Tcl_MutexLock(¬ifierMutex); |
---|
957 | timePtr = NULL; |
---|
958 | for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) { |
---|
959 | for (i = tsdPtr->numFdBits-1; i >= 0; --i) { |
---|
960 | if (FD_ISSET(i, &(tsdPtr->checkMasks.readable))) { |
---|
961 | FD_SET(i, &readableMask); |
---|
962 | } |
---|
963 | if (FD_ISSET(i, &(tsdPtr->checkMasks.writable))) { |
---|
964 | FD_SET(i, &writableMask); |
---|
965 | } |
---|
966 | if (FD_ISSET(i, &(tsdPtr->checkMasks.exceptional))) { |
---|
967 | FD_SET(i, &exceptionalMask); |
---|
968 | } |
---|
969 | } |
---|
970 | if (tsdPtr->numFdBits > numFdBits) { |
---|
971 | numFdBits = tsdPtr->numFdBits; |
---|
972 | } |
---|
973 | if (tsdPtr->pollState & POLL_WANT) { |
---|
974 | /* |
---|
975 | * Here we make sure we go through select() with the same mask |
---|
976 | * bits that were present when the thread tried to poll. |
---|
977 | */ |
---|
978 | |
---|
979 | tsdPtr->pollState |= POLL_DONE; |
---|
980 | timePtr = &poll; |
---|
981 | } |
---|
982 | } |
---|
983 | Tcl_MutexUnlock(¬ifierMutex); |
---|
984 | |
---|
985 | /* |
---|
986 | * Set up the select mask to include the receive pipe. |
---|
987 | */ |
---|
988 | |
---|
989 | if (receivePipe >= numFdBits) { |
---|
990 | numFdBits = receivePipe + 1; |
---|
991 | } |
---|
992 | FD_SET(receivePipe, &readableMask); |
---|
993 | |
---|
994 | if (select(numFdBits, &readableMask, &writableMask, &exceptionalMask, |
---|
995 | timePtr) == -1) { |
---|
996 | /* |
---|
997 | * Try again immediately on an error. |
---|
998 | */ |
---|
999 | |
---|
1000 | continue; |
---|
1001 | } |
---|
1002 | |
---|
1003 | /* |
---|
1004 | * Alert any threads that are waiting on a ready file descriptor. |
---|
1005 | */ |
---|
1006 | |
---|
1007 | Tcl_MutexLock(¬ifierMutex); |
---|
1008 | for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) { |
---|
1009 | found = 0; |
---|
1010 | |
---|
1011 | for (i = tsdPtr->numFdBits-1; i >= 0; --i) { |
---|
1012 | if (FD_ISSET(i, &(tsdPtr->checkMasks.readable)) |
---|
1013 | && FD_ISSET(i, &readableMask)) { |
---|
1014 | FD_SET(i, &(tsdPtr->readyMasks.readable)); |
---|
1015 | found = 1; |
---|
1016 | } |
---|
1017 | if (FD_ISSET(i, &(tsdPtr->checkMasks.writable)) |
---|
1018 | && FD_ISSET(i, &writableMask)) { |
---|
1019 | FD_SET(i, &(tsdPtr->readyMasks.writable)); |
---|
1020 | found = 1; |
---|
1021 | } |
---|
1022 | if (FD_ISSET(i, &(tsdPtr->checkMasks.exceptional)) |
---|
1023 | && FD_ISSET(i, &exceptionalMask)) { |
---|
1024 | FD_SET(i, &(tsdPtr->readyMasks.exceptional)); |
---|
1025 | found = 1; |
---|
1026 | } |
---|
1027 | } |
---|
1028 | |
---|
1029 | if (found || (tsdPtr->pollState & POLL_DONE)) { |
---|
1030 | tsdPtr->eventReady = 1; |
---|
1031 | if (tsdPtr->onList) { |
---|
1032 | /* |
---|
1033 | * Remove the ThreadSpecificData structure of this thread |
---|
1034 | * from the waiting list. This prevents us from |
---|
1035 | * continuously spining on select until the other threads |
---|
1036 | * runs and services the file event. |
---|
1037 | */ |
---|
1038 | |
---|
1039 | if (tsdPtr->prevPtr) { |
---|
1040 | tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr; |
---|
1041 | } else { |
---|
1042 | waitingListPtr = tsdPtr->nextPtr; |
---|
1043 | } |
---|
1044 | if (tsdPtr->nextPtr) { |
---|
1045 | tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr; |
---|
1046 | } |
---|
1047 | tsdPtr->nextPtr = tsdPtr->prevPtr = NULL; |
---|
1048 | tsdPtr->onList = 0; |
---|
1049 | tsdPtr->pollState = 0; |
---|
1050 | } |
---|
1051 | Tcl_ConditionNotify(&tsdPtr->waitCV); |
---|
1052 | } |
---|
1053 | } |
---|
1054 | Tcl_MutexUnlock(¬ifierMutex); |
---|
1055 | |
---|
1056 | /* |
---|
1057 | * Consume the next byte from the notifier pipe if the pipe was |
---|
1058 | * readable. Note that there may be multiple bytes pending, but to |
---|
1059 | * avoid a race condition we only read one at a time. |
---|
1060 | */ |
---|
1061 | |
---|
1062 | if (FD_ISSET(receivePipe, &readableMask)) { |
---|
1063 | i = read(receivePipe, buf, 1); |
---|
1064 | |
---|
1065 | if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) { |
---|
1066 | /* |
---|
1067 | * Someone closed the write end of the pipe or sent us a Quit |
---|
1068 | * message [Bug: 4139] and then closed the write end of the |
---|
1069 | * pipe so we need to shut down the notifier thread. |
---|
1070 | */ |
---|
1071 | |
---|
1072 | break; |
---|
1073 | } |
---|
1074 | } |
---|
1075 | } |
---|
1076 | |
---|
1077 | /* |
---|
1078 | * Clean up the read end of the pipe and signal any threads waiting on |
---|
1079 | * termination of the notifier thread. |
---|
1080 | */ |
---|
1081 | |
---|
1082 | close(receivePipe); |
---|
1083 | Tcl_MutexLock(¬ifierMutex); |
---|
1084 | triggerPipe = -1; |
---|
1085 | Tcl_ConditionNotify(¬ifierCV); |
---|
1086 | Tcl_MutexUnlock(¬ifierMutex); |
---|
1087 | |
---|
1088 | TclpThreadExit (0); |
---|
1089 | } |
---|
1090 | #endif /* TCL_THREADS */ |
---|
1091 | |
---|
1092 | #endif /* HAVE_COREFOUNDATION */ |
---|
1093 | |
---|
1094 | /* |
---|
1095 | * Local Variables: |
---|
1096 | * mode: c |
---|
1097 | * c-basic-offset: 4 |
---|
1098 | * fill-column: 78 |
---|
1099 | * End: |
---|
1100 | */ |
---|