Mercurial > flash_v2

annotate packages/io/fileio/current/src/select.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children 77cec8369160
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1 //==========================================================================
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2 //
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3 // select.cxx
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4 //
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5 // Fileio select() support
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 2000-05-25
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37 // Purpose: Fileio select() support
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38 // Description: Support for select().
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39 //
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40 //
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41 //
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //==========================================================================
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46
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47 #include <pkgconf/hal.h>
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48 #include <pkgconf/kernel.h>
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49 #include <pkgconf/io_fileio.h>
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50
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51 #include <cyg/kernel/ktypes.h> // base kernel types
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52 #include <cyg/infra/cyg_trac.h> // tracing macros
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53 #include <cyg/infra/cyg_ass.h> // assertion macros
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54
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55 #include <stdarg.h> // for fcntl()
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56
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57 #include "fio.h" // Private header
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58
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59 #include <cyg/kernel/sched.hxx> // scheduler definitions
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60 #include <cyg/kernel/thread.hxx> // thread definitions
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61 #include <cyg/kernel/mutex.hxx> // mutex definitions
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62 #include <cyg/kernel/clock.hxx> // clock definitions
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63
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64 #include <cyg/kernel/sched.inl>
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65 #include <cyg/kernel/thread.inl>
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66 #include <cyg/kernel/clock.inl>
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67
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68 //==========================================================================
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69 // File object locking
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70
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71 #define LOCK_FILE( fp ) cyg_file_lock( fp )
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72
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73 #define UNLOCK_FILE( fp ) cyg_file_unlock( fp )
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74
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75 //==========================================================================
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76 // Local variables
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77
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78 // Mutex for serializing select processing. This essntially controls
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79 // access to the contents of the selinfo structures embedded in the
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80 // client system data structures.
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81 static Cyg_Mutex select_mutex;
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82
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83 // Condition variable where any thread that is waiting for a select to
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84 // fire is suspended. Note that select is not intended to be a real time
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85 // operation. Whenever any selectable event occurs, all selecting threads
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86 // will be resumed. They must then rescan their selectees and resuspend if
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87 // necessary.
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88 static Cyg_Condition_Variable selwait( select_mutex );
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89
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90 static volatile cyg_uint32 selwake_count = 0;
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91
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92 //==========================================================================
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93 // Timeval to ticks conversion support
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94
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95 // Converters from sec and us to ticks
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96 static struct Cyg_Clock::converter us_converter, sec_converter;
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97
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98 static cyg_bool converters_initialized = false;
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99
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100 externC cyg_tick_count cyg_timeval_to_ticks( const struct timeval *tv )
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101 {
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102 if( !converters_initialized )
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103 {
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104 // Create the converters we need.
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105 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000, &us_converter );
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106 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000000000, &sec_converter );
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107
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108 converters_initialized = true;
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109 }
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110
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111 // Short circuit zero timeval
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112 if( tv->tv_sec == 0 && tv->tv_usec == 0 )
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113 {
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114 return 0;
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115 }
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116
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117 // Convert the seconds field to ticks.
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118 cyg_tick_count ticks = Cyg_Clock::convert( tv->tv_sec, &sec_converter );
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119
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120 // Convert the nanoseconds. This will round down to nearest whole tick.
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121 ticks += Cyg_Clock::convert( (cyg_tick_count)tv->tv_usec, &us_converter );
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122
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123 return ticks;
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124 }
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125
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126 //==========================================================================
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127 // Select API function
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128
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129 __externC int
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130 select(int nfd, fd_set *in, fd_set *out, fd_set *ex, struct timeval *tv)
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131 {
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132 FILEIO_ENTRY();
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133
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134 int error = ENOERR;
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135 int fd, mode, num;
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136 cyg_file *fp;
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137 fd_set in_res, out_res, ex_res; // Result sets
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138 fd_set *selection[3], *result[3];
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139 cyg_tick_count ticks;
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140 int mode_type[] = {CYG_FREAD, CYG_FWRITE, 0};
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141 cyg_uint32 wake_count;
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142
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143 FD_ZERO(&in_res);
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144 FD_ZERO(&out_res);
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145 FD_ZERO(&ex_res);
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146
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147 // Set up sets
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148 selection[0] = in; result[0] = &in_res;
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149 selection[1] = out; result[1] = &out_res;
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150 selection[2] = ex; result[2] = &ex_res;
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151
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152 // Compute end time
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153 if (tv)
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154 ticks = Cyg_Clock::real_time_clock->current_value() +
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155 cyg_timeval_to_ticks( tv );
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156 else ticks = 0;
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157
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158 // Lock the mutex
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159 select_mutex.lock();
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160
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161 // Scan sets for possible I/O until something found, timeout or error.
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162 while (!error)
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163 {
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164 wake_count = selwake_count;
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165
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166 num = 0; // Total file descriptors "ready"
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167 for (mode = 0; !error && mode < 3; mode++)
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168 {
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169 if (selection[mode]) {
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170 for (fd = 0; !error && fd < nfd; fd++)
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171 {
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172 if (FD_ISSET(fd, selection[mode]))
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173 {
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174 fp = cyg_fp_get( fd );
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175 if( fp == NULL )
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176 {
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177 error = EBADF;
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178 break;
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179 }
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180
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181 if ((*fp->f_ops->fo_select)(fp, mode_type[mode], 0))
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182 {
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183 FD_SET(fd, result[mode]);
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184 num++;
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185 }
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186
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187 cyg_fp_free( fp );
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188 }
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189 }
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190 }
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191 }
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192
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193 if (num)
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194 {
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195 // Found something, update user's sets
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196 if (in) FD_COPY( &in_res, in );
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197 if (out) FD_COPY( &out_res, out );
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198 if (ex) FD_COPY( &ex_res, ex );
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199 select_mutex.unlock();
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200 FILEIO_RETURN_VALUE(num);
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201 }
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202
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203 Cyg_Scheduler::lock();
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204
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205 if( wake_count == selwake_count )
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206 {
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207 // Nothing found, see if we want to wait
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208 if (tv)
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209 {
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210 if (ticks == 0)
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211 {
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212 // Special case of "poll"
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213 select_mutex.unlock();
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214 Cyg_Scheduler::unlock();
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215 FILEIO_RETURN_VALUE(0);
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216 }
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217
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218 if( !selwait.wait( ticks ) )
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219 {
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220 // A non-standard wakeup, if the current time is equal to
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221 // or past the timeout, return zero. Otherwise return
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222 // EINTR, since we have been released.
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223 if( Cyg_Clock::real_time_clock->current_value() >= ticks )
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224 {
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225 select_mutex.unlock();
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226 FILEIO_RETURN_VALUE(0);
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227 }
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228 else error = EINTR;
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229 }
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230 }
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231 else
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232 {
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233 // Wait forever (until something happens)
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234
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235 if( !selwait.wait() )
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236 error = EINTR;
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237 }
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238 }
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239
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240 Cyg_Scheduler::unlock();
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241
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242 } // while(!error)
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243
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244 select_mutex.unlock();
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245
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246 FILEIO_RETURN(error);
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247 }
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248
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249 //==========================================================================
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250 // Select support functions.
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251
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252 // -------------------------------------------------------------------------
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253 // cyg_selinit() is used to initialize a selinfo structure
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254
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255 void cyg_selinit( struct CYG_SELINFO_TAG *sip )
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256 {
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257 sip->si_info = 0;
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258 sip->si_thread = 0;
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259 }
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260
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261 // -------------------------------------------------------------------------
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262 // cyg_selrecord() is called when a client device needs to register
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263 // the current thread for selection.
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264
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265 void cyg_selrecord( CYG_ADDRWORD info, struct CYG_SELINFO_TAG *sip )
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266 {
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267 sip->si_info = info;
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268 sip->si_thread = (CYG_ADDRESS)Cyg_Thread::self();
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269 }
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270
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271 // -------------------------------------------------------------------------
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272 // cyg_selwakeup() is called when the client device matches the select
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273 // criterion, and needs to wake up a selector.
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274
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275 void cyg_selwakeup( struct CYG_SELINFO_TAG *sip )
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276 {
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277 // We don't actually use the si_info field of selinfo at present.
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278 // A potential use would be to select one of several selwait condition
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279 // variables to signal. However, that would only be necessary if we
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280 // end up having lots of threads in select.
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281
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282 Cyg_Scheduler::lock();
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283
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284 if( sip->si_thread != 0 )
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285 {
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286 // If the thread pointer is still present, this selection has
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287 // not been fired before. Test whether the thread is still
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288 // waiting on the selwait condvar and if so, wake all waiters
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289 // on it.
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290
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291 // Note that this code has to be a bit careful with accessing
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292 // the thread. Since there is no select cancel mechanism, the
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293 // information in si_thread may be old, and the thread may
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294 // have been deleted in the meantime. However, we do know that
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295 // any address in si_thread was for a thread object at some
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296 // time in the past, so will not be an illegal address, and
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297 // the get_current_queue() member is a simple memory
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298 // access. Hence the worse that this code could do is give a
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299 // false positive and wake up some selectors when it
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300 // shouldn't. However, care should be taken in making any
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301 // changes to this code to avoid adding assumptions that the
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302 // thread pointer is always valid.
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303
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304 Cyg_Thread *thread = (Cyg_Thread *)sip->si_thread;
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305
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306 if( thread->get_current_queue() == selwait.get_queue() )
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307 {
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308 sip->si_thread = 0;
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309 selwait.broadcast();
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310 selwake_count++;
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311 }
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312 }
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313
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314 Cyg_Scheduler::unlock();
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315 }
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316
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317 // -------------------------------------------------------------------------
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318 // EOF select.cxx