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annotate packages/io/fileio/current/src/select.cxx @ 410:064536ee7f68

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* src/fio.h: Added macros to deal with signal handling. These will call into the POSIX package if it is present, but are null if it is not. * src/select.cxx: Renamed original select() to cyg_pselect() and added select() and pselect() routine from POSIX-200X to call it. Reorganized code a little and added calls to macros to deal with signal delivery and detection. * cdl/fileio.cdl: * tests/pselect.c: New test added to verify the signal masking and delivery behaviour of pselect(). * tests/select.c: Fixed up some printfs to make it a little tidier.
author nickg
date Mon, 11 Nov 2002 23:58:53 +0000
parents fc52fa818b5f
children 786e2e6e3c3d
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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 // Copyright (C) 2002 Nick Garnett
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): nickg
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45 // Contributors: nickg
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46 // Date: 2000-05-25
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47 // Purpose: Fileio select() support
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48 // Description: Support for select().
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49 //
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50 //
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51 //
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52 //
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53 //####DESCRIPTIONEND####
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54 //
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55 //==========================================================================
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56
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57 #include <pkgconf/hal.h>
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58 #include <pkgconf/kernel.h>
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59 #include <pkgconf/io_fileio.h>
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60
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61 #include <cyg/kernel/ktypes.h> // base kernel types
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62 #include <cyg/infra/cyg_trac.h> // tracing macros
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63 #include <cyg/infra/cyg_ass.h> // assertion macros
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65 #include <stdarg.h> // for fcntl()
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67 #include "fio.h" // Private header
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68
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69 #include <sys/select.h> // select header
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71 #include <cyg/kernel/sched.hxx> // scheduler definitions
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72 #include <cyg/kernel/thread.hxx> // thread definitions
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73 #include <cyg/kernel/mutex.hxx> // mutex definitions
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74 #include <cyg/kernel/clock.hxx> // clock definitions
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75
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76 #include <cyg/kernel/sched.inl>
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77 #include <cyg/kernel/thread.inl>
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78 #include <cyg/kernel/clock.inl>
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79
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80 //==========================================================================
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81 // File object locking
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82
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83 #define LOCK_FILE( fp ) cyg_file_lock( fp )
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84
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85 #define UNLOCK_FILE( fp ) cyg_file_unlock( fp )
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86
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87 //==========================================================================
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88 // Local variables
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89
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90 // Mutex for serializing select processing. This essntially controls
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91 // access to the contents of the selinfo structures embedded in the
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92 // client system data structures.
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93 static Cyg_Mutex select_mutex CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO_FS);
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94
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95 // Condition variable where any thread that is waiting for a select to
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96 // fire is suspended. Note that select is not intended to be a real time
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97 // operation. Whenever any selectable event occurs, all selecting threads
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98 // will be resumed. They must then rescan their selectees and resuspend if
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99 // necessary.
208
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100 static Cyg_Condition_Variable selwait( select_mutex ) CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO_FS);
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101
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102 static volatile cyg_uint32 selwake_count = 0;
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103
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104 //==========================================================================
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105 // Timeval to ticks conversion support
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106
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107 // Converters from sec and us to ticks
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108 static struct Cyg_Clock::converter us_converter, sec_converter;
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109
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110 static cyg_bool converters_initialized = false;
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111
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112 externC cyg_tick_count cyg_timeval_to_ticks( const struct timeval *tv )
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113 {
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114 if( !converters_initialized )
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115 {
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116 // Create the converters we need.
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117 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000, &us_converter );
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118 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000000000, &sec_converter );
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119
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120 converters_initialized = true;
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121 }
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122
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123 // Short circuit zero timeval
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124 if( tv->tv_sec == 0 && tv->tv_usec == 0 )
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125 {
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126 return 0;
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127 }
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128
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129 // Convert the seconds field to ticks.
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130 cyg_tick_count ticks = Cyg_Clock::convert( tv->tv_sec, &sec_converter );
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131
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132 // Convert the nanoseconds. This will round down to nearest whole tick.
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133 ticks += Cyg_Clock::convert( (cyg_tick_count)tv->tv_usec, &us_converter );
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134
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135 return ticks;
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136 }
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137
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138 //==========================================================================
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139 // Select API function
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140
410
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141 static int
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142 cyg_pselect(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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143 struct timeval *tv, const sigset_t *mask)
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144 {
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145 FILEIO_ENTRY();
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146
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147 int error = ENOERR;
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148 int fd, mode, num;
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149 cyg_file *fp;
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150 fd_set in_res, out_res, ex_res; // Result sets
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151 fd_set *selection[3], *result[3];
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152 cyg_tick_count ticks;
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153 int mode_type[] = {CYG_FREAD, CYG_FWRITE, 0};
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154 cyg_uint32 wake_count;
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155 sigset_t oldmask;
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156
115
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157 FD_ZERO(&in_res);
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158 FD_ZERO(&out_res);
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159 FD_ZERO(&ex_res);
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160
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161 // Set up sets
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162 selection[0] = in; result[0] = &in_res;
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163 selection[1] = out; result[1] = &out_res;
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164 selection[2] = ex; result[2] = &ex_res;
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165
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166 // Compute end time
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167 if (tv)
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168 ticks = cyg_timeval_to_ticks( tv );
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169 else ticks = 0;
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170
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171 // Lock the mutex
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172 select_mutex.lock();
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173
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174 // Scan sets for possible I/O until something found, timeout or error.
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175 while (!error)
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176 {
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177 wake_count = selwake_count;
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178
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179 num = 0; // Total file descriptors "ready"
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180 for (mode = 0; !error && mode < 3; mode++)
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181 {
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182 if (selection[mode]) {
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183 for (fd = 0; !error && fd < nfd; fd++)
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184 {
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185 if (FD_ISSET(fd, selection[mode]))
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186 {
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187 fp = cyg_fp_get( fd );
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188 if( fp == NULL )
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189 {
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190 error = EBADF;
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191 break;
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192 }
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193
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194 if ((*fp->f_ops->fo_select)(fp, mode_type[mode], 0))
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195 {
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196 FD_SET(fd, result[mode]);
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197 num++;
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198 }
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199
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200 cyg_fp_free( fp );
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201 }
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202 }
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203 }
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204 }
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205
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206 if (num)
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207 {
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208 // Found something, update user's sets
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209 if (in) FD_COPY( &in_res, in );
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210 if (out) FD_COPY( &out_res, out );
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211 if (ex) FD_COPY( &ex_res, ex );
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212 select_mutex.unlock();
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213 CYG_FILEIO_DELIVER_SIGNALS( mask );
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214 FILEIO_RETURN_VALUE(num);
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215 }
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216
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217 Cyg_Scheduler::lock();
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218
410
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219 // Switch to the supplied signal mask. This will permit delivery
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220 // of any signals that might terminate this select operation.
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221
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222 CYG_FILEIO_SIGMASK_SET( mask, &oldmask );
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223
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224 do
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225 {
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226
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227 // We need to see if any signals have been posted while we
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228 // were testing all those files. The handlers will not
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229 // have run because we have ASRs inhibited but the signal
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230 // will have been set pending.
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231
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232 if( CYG_FILEIO_SIGPENDING() )
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233 {
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234 // There are pending signals so we need to terminate
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235 // the select operation and return EINTR. Handlers for
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236 // the pending signals will be called just before we
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237 // return.
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238
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239 error = EINTR;
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240 break;
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241 }
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242
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243 if( wake_count == selwake_count )
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244 {
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245 // Nothing found, see if we want to wait
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246 if (tv)
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247 {
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248 // Special case of "poll"
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249 if (ticks == 0)
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250 {
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251 error = EAGAIN;
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252 break;
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253 }
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254
410
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255 ticks += Cyg_Clock::real_time_clock->current_value();
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256
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257 if( !selwait.wait( ticks ) )
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258 {
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259 // A non-standard wakeup, if the current time is equal to
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260 // or past the timeout, return zero. Otherwise return
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261 // EINTR, since we have been released.
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262
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263 if( Cyg_Clock::real_time_clock->current_value() >= ticks )
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264 {
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265 error = EAGAIN;
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266 break;
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267 }
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268 else error = EINTR;
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269 }
410
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270
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271 ticks -= Cyg_Clock::real_time_clock->current_value();
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272 }
410
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273 else
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274 {
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275 // Wait forever (until something happens)
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276
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277 if( !selwait.wait() )
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278 error = EINTR;
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279 }
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280 }
410
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281
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282 } while(0);
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283
410
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284 CYG_FILEIO_SIGMASK_SET( &oldmask, NULL );
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285
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286 Cyg_Scheduler::unlock();
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287
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288 } // while(!error)
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289
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290 select_mutex.unlock();
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291
410
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292 // If the error code is EAGAIN, this means that a timeout has
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293 // happened. We return zero in that case, rather than a proper
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294 // error code.
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295 // If the error code is EINTR, then a signal may be pending
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296 // delivery. Call back into the POSIX package to handle it.
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297
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298 if( error == EAGAIN )
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299 FILEIO_RETURN_VALUE(0);
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300 else if( error == EINTR )
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301 CYG_FILEIO_DELIVER_SIGNALS( mask );
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302
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303 FILEIO_RETURN(error);
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304 }
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305
410
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306 // -------------------------------------------------------------------------
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307 // Select API function
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308
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309 __externC int
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310 select(int nfd, fd_set *in, fd_set *out, fd_set *ex, struct timeval *tv)
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311 {
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312 return cyg_pselect(nfd, in, out, ex, tv, NULL);
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313 }
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314
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315 // -------------------------------------------------------------------------
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316 // Pselect API function
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317 //
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318 // This is derived from the POSIX-200X specification.
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319
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320 #ifdef CYGPKG_POSIX
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321
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322 __externC int
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323 pselect(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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324 const struct timespec *ts, const sigset_t *sigmask)
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325 {
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326 struct timeval tv;
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327
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328 if (ts != NULL)
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329 {
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330 tv.tv_sec = ts->tv_sec;
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331 tv.tv_usec = ts->tv_nsec/1000;
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332 }
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333
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334 return cyg_pselect(nfd, in, out, ex, &tv, sigmask);
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335 }
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336
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337 #endif
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338
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339 //==========================================================================
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340 // Select support functions.
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341
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342 // -------------------------------------------------------------------------
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343 // cyg_selinit() is used to initialize a selinfo structure
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344
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345 void cyg_selinit( struct CYG_SELINFO_TAG *sip )
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346 {
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347 sip->si_info = 0;
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348 sip->si_thread = 0;
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349 }
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350
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351 // -------------------------------------------------------------------------
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352 // cyg_selrecord() is called when a client device needs to register
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353 // the current thread for selection.
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354
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355 void cyg_selrecord( CYG_ADDRWORD info, struct CYG_SELINFO_TAG *sip )
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356 {
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357 sip->si_info = info;
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358 sip->si_thread = (CYG_ADDRESS)Cyg_Thread::self();
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359 }
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360
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361 // -------------------------------------------------------------------------
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362 // cyg_selwakeup() is called when the client device matches the select
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363 // criterion, and needs to wake up a selector.
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364
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365 void cyg_selwakeup( struct CYG_SELINFO_TAG *sip )
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366 {
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367 // We don't actually use the si_info field of selinfo at present.
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368 // A potential use would be to select one of several selwait condition
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369 // variables to signal. However, that would only be necessary if we
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370 // end up having lots of threads in select.
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371
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372 Cyg_Scheduler::lock();
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373
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374 if( sip->si_thread != 0 )
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375 {
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376 // If the thread pointer is still present, this selection has
128
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377 // not been fired before. We just wake up all threads waiting,
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378 // regardless of whether they are waiting for this event or
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379 // not. This avoids any race conditions, and is consistent
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380 // with the behaviour of the BSD kernel.
115
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381
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382 sip->si_thread = 0;
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383 selwait.broadcast();
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384 selwake_count++;
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385
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386 }
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387
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388 Cyg_Scheduler::unlock();
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389 }
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390
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391 // -------------------------------------------------------------------------
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392 // EOF select.cxx