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annotate packages/io/fileio/current/src/select.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY 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
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): nickg
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43 // Contributors: nickg
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44 // Date: 2000-05-25
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45 // Purpose: Fileio select() support
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46 // Description: Support for select().
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47 //
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48 //
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <pkgconf/hal.h>
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56 #include <pkgconf/kernel.h>
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57 #include <pkgconf/io_fileio.h>
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58
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59 #include <cyg/kernel/ktypes.h> // base kernel types
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60 #include <cyg/infra/cyg_trac.h> // tracing macros
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61 #include <cyg/infra/cyg_ass.h> // assertion macros
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62
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63 #include <stdarg.h> // for fcntl()
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64
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65 #include "fio.h" // Private header
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66
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67 #include <sys/select.h> // select header
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68 #include <sys/time.h>
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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/flag.hxx> // flag 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 // Get a flag based on the thread's unique ID. Note: In a system with a large
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87 // number of threads, the same flag may be used by more than one thread.
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88 #define SELECT_WAIT_FLAG_GET() (1 << (Cyg_Thread::self()->get_unique_id() \
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89 & (sizeof (Cyg_FlagValue) * NBBY - 1)))
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90
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91 //==========================================================================
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92 // Local variables
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93
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94 static volatile cyg_uint32 selwake_count = 0;
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95
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96 // A flag is used to block a thread until data from the device is available. This
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97 // prevents all threads from waking up at the same time and polling for changes.
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98 // Each thread is allocated a flag bit via the SELECT_WAIT_FLAG_GET() macro when
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99 // the thread registers for selection via cyg_selrecord (). The flag is stored in
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100 // the driver's select info block. Only those threads specified via the flags in
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101 // the select info are woken up by cyg_selwakeup ().
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102 // If there are more than 32 threads in the system, then there is a chance that
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103 // cyg_selwakeup () may wake up more than one thread. Each thread then polls for
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104 // changes.
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105 static Cyg_Flag select_flag CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO_FS);
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106
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107 //==========================================================================
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108 // Timeval to ticks conversion support
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109
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110 // Converters from sec and us to ticks
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111 static struct Cyg_Clock::converter us_converter, sec_converter;
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112
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113 static cyg_bool converters_initialized = false;
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114
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115 externC cyg_tick_count cyg_timeval_to_ticks( const struct timeval *tv )
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116 {
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117 if( !converters_initialized )
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118 {
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119 // Create the converters we need.
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120 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000, &us_converter );
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121 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000000000, &sec_converter );
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122
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123 converters_initialized = true;
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124 }
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125
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126 // Short circuit zero timeval
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127 if( tv->tv_sec == 0 && tv->tv_usec == 0 )
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128 {
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129 return 0;
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130 }
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131
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132 // Convert the seconds field to ticks.
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133 cyg_tick_count ticks = Cyg_Clock::convert( tv->tv_sec, &sec_converter );
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134
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135 // Convert the nanoseconds. This will round down to nearest whole tick.
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136 ticks += Cyg_Clock::convert( (cyg_tick_count)tv->tv_usec, &us_converter );
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137
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138 return ticks;
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139 }
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140
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141 //==========================================================================
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142 // Select API function
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143
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144 static int
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145 cyg_pselect(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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146 struct timeval *tv, const sigset_t *mask)
115
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147 {
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148 FILEIO_ENTRY();
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149
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150 int error = ENOERR;
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151 int fd, mode, num;
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152 cyg_file *fp;
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153 fd_set in_res, out_res, ex_res; // Result sets
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154 fd_set *selection[3], *result[3];
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155 cyg_tick_count ticks;
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156 int mode_type[] = {CYG_FREAD, CYG_FWRITE, 0};
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157 cyg_uint32 wake_count;
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158 sigset_t oldmask;
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159
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160 Cyg_FlagValue myFlag = SELECT_WAIT_FLAG_GET ();
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161 int maxFdIndex = __howmany(nfd, __NFDBITS); // size of fd sets
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162
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163 // Make sure the nfd < FD_SETSIZE, a value greater than FD_SETSIZE
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164 // would break the results sets
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165 if(nfd > FD_SETSIZE)
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166 {
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167 FILEIO_RETURN(EINVAL);
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168 }
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169
115
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170 FD_ZERO(&in_res);
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171 FD_ZERO(&out_res);
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172 FD_ZERO(&ex_res);
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173
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174 // Set up sets
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175 selection[0] = in; result[0] = &in_res;
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176 selection[1] = out; result[1] = &out_res;
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177 selection[2] = ex; result[2] = &ex_res;
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178
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179 // Compute end time
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180 if (tv)
281
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181 ticks = cyg_timeval_to_ticks( tv );
115
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182 else ticks = 0;
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183
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184 // Scan sets for possible I/O until something found, timeout or error.
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185 while (!error)
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186 {
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187 wake_count = selwake_count;
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188
115
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189 num = 0; // Total file descriptors "ready"
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190 for (mode = 0; !error && mode < 3; mode++)
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191 {
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192 if (selection[mode])
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193 {
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194 fd_mask *fds_bits = selection[mode]->fds_bits;
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195 int index, fdbase;
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196 for(index = 0, fdbase = 0; !error && index < maxFdIndex; index++, fdbase += __NFDBITS)
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197 {
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198 fd_mask mask = fds_bits[index];
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199 for(fd = fdbase; mask != 0; fd++, mask >>= 1)
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200 {
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201 if(mask & 1)
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202 {
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203 fp = cyg_fp_get( fd );
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204 if( fp == NULL )
abab6e075ce3 * include/fileio.h: Changed si_thread to si_waitFlag
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205 {
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206 error = EBADF;
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207 break;
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208 }
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209
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210 if ((*fp->f_ops->fo_select)(fp, mode_type[mode], 0))
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211 {
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212 FD_SET(fd, result[mode]);
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213 num++;
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214 }
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215 cyg_fp_free( fp );
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216 }
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217 }
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218 }
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219 }
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220 }
1697
4a515225541b 2004-07-23 Oyvind Harboe <oyvind.harboe@zylin.com>
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221
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222 if (error)
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223 break;
115
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224
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225 if (num)
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226 {
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227 // Found something, update user's sets
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228 if (in) FD_COPY( &in_res, in );
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229 if (out) FD_COPY( &out_res, out );
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230 if (ex) FD_COPY( &ex_res, ex );
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231 CYG_FILEIO_DELIVER_SIGNALS( mask );
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232 FILEIO_RETURN_VALUE(num);
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233 }
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234
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235 Cyg_Scheduler::lock();
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236
410
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237 // Switch to the supplied signal mask. This will permit delivery
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238 // of any signals that might terminate this select operation.
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239
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240 CYG_FILEIO_SIGMASK_SET( mask, &oldmask );
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241
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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242 do
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243 {
410
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244
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245 // We need to see if any signals have been posted while we
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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246 // were testing all those files. The handlers will not
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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247 // have run because we have ASRs inhibited but the signal
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248 // will have been set pending.
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249
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250 if( CYG_FILEIO_SIGPENDING() )
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251 {
410
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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252 // There are pending signals so we need to terminate
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253 // the select operation and return EINTR. Handlers for
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254 // the pending signals will be called just before we
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255 // return.
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256
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257 error = EINTR;
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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258 break;
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diff changeset
259 }
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260
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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261 if( wake_count == selwake_count )
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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262 {
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263 // Nothing found, see if we want to wait
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264 if (tv)
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265 {
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266 // Special case of "poll"
410
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267 if (ticks == 0)
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268 {
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269 error = EAGAIN;
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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270 break;
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diff changeset
271 }
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272
410
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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273 ticks += Cyg_Clock::real_time_clock->current_value();
281
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274
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275 if( !select_flag.wait (myFlag, Cyg_Flag::OR, ticks) )
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276 {
410
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277 // A non-standard wakeup, if the current time is equal to
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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278 // or past the timeout, return zero. Otherwise return
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279 // EINTR, since we have been released.
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280
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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281 if( Cyg_Clock::real_time_clock->current_value() >= ticks )
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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diff changeset
282 {
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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diff changeset
283 error = EAGAIN;
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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diff changeset
284 break;
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diff changeset
285 }
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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diff changeset
286 else error = EINTR;
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287 }
410
064536ee7f68 * src/fio.h: Added macros to deal with signal handling. These will
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288
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289 ticks -= Cyg_Clock::real_time_clock->current_value();
115
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290 }
410
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291 else
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292 {
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293 // Wait forever (until something happens)
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294 if( !select_flag.wait (myFlag, Cyg_Flag::OR) )
410
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295 error = EINTR;
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296 }
115
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297 }
410
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298
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299 } while(0);
115
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300
410
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301 CYG_FILEIO_SIGMASK_SET( &oldmask, NULL );
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302
115
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303 Cyg_Scheduler::unlock();
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304
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305 } // while(!error)
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306
410
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307 // If the error code is EAGAIN, this means that a timeout has
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308 // happened. We return zero in that case, rather than a proper
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309 // error code.
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310 // If the error code is EINTR, then a signal may be pending
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311 // delivery. Call back into the POSIX package to handle it.
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312
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313 if( error == EAGAIN )
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314 FILEIO_RETURN_VALUE(0);
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315 else if( error == EINTR )
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316 CYG_FILEIO_DELIVER_SIGNALS( mask );
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317
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318 FILEIO_RETURN(error);
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319 }
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320
410
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321 // -------------------------------------------------------------------------
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322 // Select API function
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323
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324 __externC int
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325 select(int nfd, fd_set *in, fd_set *out, fd_set *ex, struct timeval *tv)
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326 {
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327 return cyg_pselect(nfd, in, out, ex, tv, NULL);
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328 }
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329
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330 // -------------------------------------------------------------------------
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331 // Pselect API function
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332 //
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333 // This is derived from the POSIX-200X specification.
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334
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335 __externC int
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336 pselect(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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337 const struct timespec *ts, const sigset_t *sigmask)
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338 {
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339 struct timeval tv;
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340
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341 #ifndef CYGPKG_POSIX_SIGNALS
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342 CYG_ASSERT( sigmask == NULL,
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343 "pselect called with non-null sigmask without POSIX signal support"
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344 );
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345 #endif
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346
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347 if (ts != NULL)
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348 {
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349 tv.tv_sec = ts->tv_sec;
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350 tv.tv_usec = ts->tv_nsec/1000;
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351 }
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352
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353 return cyg_pselect(nfd, in, out, ex, ts ? &tv : NULL, sigmask);
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354 }
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355
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356 //==========================================================================
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357 // Select support functions.
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358
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359 // -------------------------------------------------------------------------
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360 // cyg_selinit() is used to initialize a selinfo structure
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361
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362 void cyg_selinit( struct CYG_SELINFO_TAG *sip )
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363 {
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364 sip->si_info = 0;
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365 sip->si_waitFlag = 0;
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366 }
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367
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368 // -------------------------------------------------------------------------
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369 // cyg_selrecord() is called when a client device needs to register
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370 // the current thread for selection. Save the flag that identifies the thread.
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371 void cyg_selrecord( CYG_ADDRWORD info, struct CYG_SELINFO_TAG *sip )
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372 {
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373 sip->si_info = info;
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374 Cyg_Scheduler::lock();
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375 sip->si_waitFlag |= SELECT_WAIT_FLAG_GET ();
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376 Cyg_Scheduler::unlock();
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377 }
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378
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379 // -------------------------------------------------------------------------
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380 // cyg_selwakeup() is called when the client device matches the select
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381 // criterion, and needs to wake up a thread.
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382 void cyg_selwakeup( struct CYG_SELINFO_TAG *sip )
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383 {
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384 // We don't actually use the si_info field of selinfo at present.
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385 Cyg_Scheduler::lock();
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386
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387 if( sip->si_waitFlag != 0 )
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388 {
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389 // If the flag is still present, this selection has not fired before.
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390 // Only wake up the threads waiting on the flags specified in si_waitFlag.
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391 // There is no need to wake threads that are not waiting for this data.
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392 select_flag.setbits (sip->si_waitFlag);
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393 sip->si_waitFlag = 0; // clear all flags
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394 select_flag.maskbits (sip->si_waitFlag);
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395 selwake_count++;
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396 }
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397 Cyg_Scheduler::unlock();
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398 }
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399
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400 // -------------------------------------------------------------------------
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401 // EOF select.cxx