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annotate packages/io/fileio/current/src/select.cxx @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children fc52fa818b5f
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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 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): nickg
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44 // Contributors: nickg
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45 // Date: 2000-05-25
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46 // Purpose: Fileio select() support
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47 // Description: Support for select().
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48 //
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49 //
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50 //
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <pkgconf/hal.h>
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57 #include <pkgconf/kernel.h>
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58 #include <pkgconf/io_fileio.h>
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59
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60 #include <cyg/kernel/ktypes.h> // base kernel types
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61 #include <cyg/infra/cyg_trac.h> // tracing macros
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62 #include <cyg/infra/cyg_ass.h> // assertion macros
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63
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64 #include <stdarg.h> // for fcntl()
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65
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66 #include "fio.h" // Private header
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67
174
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68 #include <sys/select.h> // select header
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69
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70 #include <cyg/kernel/sched.hxx> // scheduler definitions
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71 #include <cyg/kernel/thread.hxx> // thread definitions
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72 #include <cyg/kernel/mutex.hxx> // mutex definitions
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73 #include <cyg/kernel/clock.hxx> // clock definitions
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74
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75 #include <cyg/kernel/sched.inl>
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76 #include <cyg/kernel/thread.inl>
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77 #include <cyg/kernel/clock.inl>
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78
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79 //==========================================================================
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80 // File object locking
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81
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82 #define LOCK_FILE( fp ) cyg_file_lock( fp )
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83
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84 #define UNLOCK_FILE( fp ) cyg_file_unlock( fp )
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85
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86 //==========================================================================
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87 // Local variables
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88
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89 // Mutex for serializing select processing. This essntially controls
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90 // access to the contents of the selinfo structures embedded in the
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91 // client system data structures.
208
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92 static Cyg_Mutex select_mutex CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO_FS);
115
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93
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94 // Condition variable where any thread that is waiting for a select to
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95 // fire is suspended. Note that select is not intended to be a real time
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96 // operation. Whenever any selectable event occurs, all selecting threads
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97 // will be resumed. They must then rescan their selectees and resuspend if
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98 // necessary.
208
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99 static Cyg_Condition_Variable selwait( select_mutex ) CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO_FS);
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100
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101 static volatile cyg_uint32 selwake_count = 0;
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102
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103 //==========================================================================
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104 // Timeval to ticks conversion support
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105
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106 // Converters from sec and us to ticks
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107 static struct Cyg_Clock::converter us_converter, sec_converter;
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108
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109 static cyg_bool converters_initialized = false;
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110
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111 externC cyg_tick_count cyg_timeval_to_ticks( const struct timeval *tv )
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112 {
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113 if( !converters_initialized )
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114 {
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115 // Create the converters we need.
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116 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000, &us_converter );
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117 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000000000, &sec_converter );
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118
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119 converters_initialized = true;
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120 }
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121
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122 // Short circuit zero timeval
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123 if( tv->tv_sec == 0 && tv->tv_usec == 0 )
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124 {
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125 return 0;
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126 }
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127
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128 // Convert the seconds field to ticks.
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129 cyg_tick_count ticks = Cyg_Clock::convert( tv->tv_sec, &sec_converter );
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130
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131 // Convert the nanoseconds. This will round down to nearest whole tick.
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132 ticks += Cyg_Clock::convert( (cyg_tick_count)tv->tv_usec, &us_converter );
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133
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134 return ticks;
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135 }
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136
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137 //==========================================================================
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138 // Select API function
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139
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140 __externC int
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141 select(int nfd, fd_set *in, fd_set *out, fd_set *ex, struct timeval *tv)
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142 {
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143 FILEIO_ENTRY();
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144
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145 int error = ENOERR;
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146 int fd, mode, num;
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147 cyg_file *fp;
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148 fd_set in_res, out_res, ex_res; // Result sets
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149 fd_set *selection[3], *result[3];
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150 cyg_tick_count ticks;
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151 int mode_type[] = {CYG_FREAD, CYG_FWRITE, 0};
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152 cyg_uint32 wake_count;
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153
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154 FD_ZERO(&in_res);
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155 FD_ZERO(&out_res);
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156 FD_ZERO(&ex_res);
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157
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158 // Set up sets
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159 selection[0] = in; result[0] = &in_res;
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160 selection[1] = out; result[1] = &out_res;
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161 selection[2] = ex; result[2] = &ex_res;
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162
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163 // Compute end time
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164 if (tv)
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165 ticks = Cyg_Clock::real_time_clock->current_value() +
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166 cyg_timeval_to_ticks( tv );
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167 else ticks = 0;
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168
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169 // Lock the mutex
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170 select_mutex.lock();
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171
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172 // Scan sets for possible I/O until something found, timeout or error.
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173 while (!error)
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174 {
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175 wake_count = selwake_count;
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176
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177 num = 0; // Total file descriptors "ready"
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178 for (mode = 0; !error && mode < 3; mode++)
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179 {
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180 if (selection[mode]) {
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181 for (fd = 0; !error && fd < nfd; fd++)
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182 {
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183 if (FD_ISSET(fd, selection[mode]))
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184 {
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185 fp = cyg_fp_get( fd );
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186 if( fp == NULL )
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187 {
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188 error = EBADF;
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189 break;
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190 }
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191
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192 if ((*fp->f_ops->fo_select)(fp, mode_type[mode], 0))
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193 {
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194 FD_SET(fd, result[mode]);
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195 num++;
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196 }
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197
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198 cyg_fp_free( fp );
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199 }
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200 }
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201 }
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202 }
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203
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204 if (num)
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205 {
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206 // Found something, update user's sets
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207 if (in) FD_COPY( &in_res, in );
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208 if (out) FD_COPY( &out_res, out );
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209 if (ex) FD_COPY( &ex_res, ex );
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210 select_mutex.unlock();
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211 FILEIO_RETURN_VALUE(num);
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212 }
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213
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214 Cyg_Scheduler::lock();
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215
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216 if( wake_count == selwake_count )
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217 {
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218 // Nothing found, see if we want to wait
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219 if (tv)
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220 {
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221 if (ticks == 0)
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222 {
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223 // Special case of "poll"
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224 select_mutex.unlock();
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225 Cyg_Scheduler::unlock();
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226 FILEIO_RETURN_VALUE(0);
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227 }
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228
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229 if( !selwait.wait( ticks ) )
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230 {
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231 // A non-standard wakeup, if the current time is equal to
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232 // or past the timeout, return zero. Otherwise return
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233 // EINTR, since we have been released.
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234 if( Cyg_Clock::real_time_clock->current_value() >= ticks )
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235 {
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236 select_mutex.unlock();
119
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237 Cyg_Scheduler::unlock();
115
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238 FILEIO_RETURN_VALUE(0);
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239 }
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240 else error = EINTR;
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241 }
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242 }
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243 else
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244 {
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245 // Wait forever (until something happens)
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246
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247 if( !selwait.wait() )
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248 error = EINTR;
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249 }
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250 }
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251
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252 Cyg_Scheduler::unlock();
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253
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254 } // while(!error)
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255
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256 select_mutex.unlock();
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257
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258 FILEIO_RETURN(error);
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259 }
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260
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261 //==========================================================================
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262 // Select support functions.
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263
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264 // -------------------------------------------------------------------------
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265 // cyg_selinit() is used to initialize a selinfo structure
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266
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267 void cyg_selinit( struct CYG_SELINFO_TAG *sip )
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268 {
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269 sip->si_info = 0;
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270 sip->si_thread = 0;
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271 }
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272
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273 // -------------------------------------------------------------------------
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274 // cyg_selrecord() is called when a client device needs to register
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275 // the current thread for selection.
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276
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277 void cyg_selrecord( CYG_ADDRWORD info, struct CYG_SELINFO_TAG *sip )
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278 {
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279 sip->si_info = info;
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280 sip->si_thread = (CYG_ADDRESS)Cyg_Thread::self();
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281 }
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282
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283 // -------------------------------------------------------------------------
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284 // cyg_selwakeup() is called when the client device matches the select
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285 // criterion, and needs to wake up a selector.
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286
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287 void cyg_selwakeup( struct CYG_SELINFO_TAG *sip )
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288 {
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289 // We don't actually use the si_info field of selinfo at present.
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290 // A potential use would be to select one of several selwait condition
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291 // variables to signal. However, that would only be necessary if we
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292 // end up having lots of threads in select.
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293
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294 Cyg_Scheduler::lock();
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295
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296 if( sip->si_thread != 0 )
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297 {
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298 // If the thread pointer is still present, this selection has
128
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299 // not been fired before. We just wake up all threads waiting,
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300 // regardless of whether they are waiting for this event or
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301 // not. This avoids any race conditions, and is consistent
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302 // with the behaviour of the BSD kernel.
115
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303
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304 sip->si_thread = 0;
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305 selwait.broadcast();
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306 selwake_count++;
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307
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308 }
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309
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310 Cyg_Scheduler::unlock();
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311 }
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312
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313 // -------------------------------------------------------------------------
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314 // EOF select.cxx