Mercurial > cpython-lru_cache-weakref

annotate Parser/intrcheck.c @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 65d2d8e67da3
children fae78cf8541d
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Check for interrupts */
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33
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34 #include "config.h"
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35 #include "myproto.h"
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36 #include "intrcheck.h"
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37
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38
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39 #ifdef QUICKWIN
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40
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41 #include <io.h>
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42
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43 void
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44 initintr()
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45 {
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46 }
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47
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48 int
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49 intrcheck()
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50 {
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51 _wyield();
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52 }
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53
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54 #define OK
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55
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56 #endif /* QUICKWIN */
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57
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58 #ifdef _M_IX86
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59 #include <io.h>
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60 #endif
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61
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62 #if defined(MSDOS) && !defined(QUICKWIN)
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63
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64 #ifdef __GNUC__
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65
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66 /* This is for DJGPP's GO32 extender. I don't know how to trap
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67 * control-C (There's no API for ctrl-C, and I don't want to mess with
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68 * the interrupt vectors.) However, this DOES catch control-break.
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69 * --Amrit
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70 */
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71
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72 #include <go32.h>
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73
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74 void
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75 initintr()
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76 {
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77 _go32_want_ctrl_break(1 /* TRUE */);
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78 }
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79
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80 int
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81 intrcheck()
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82 {
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83 return _go32_was_ctrl_break_hit();
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84 }
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85
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86 #else /* !__GNUC__ */
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87
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88 /* This might work for MS-DOS (untested though): */
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90 void
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91 initintr()
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92 {
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93 }
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95 int
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96 intrcheck()
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97 {
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98 int interrupted = 0;
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99 while (kbhit()) {
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100 if (getch() == '\003')
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101 interrupted = 1;
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102 }
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103 return interrupted;
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104 }
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105
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106 #endif /* __GNUC__ */
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107
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108 #define OK
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109
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110 #endif /* MSDOS && !QUICKWIN */
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112
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113 #ifdef macintosh
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114
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115 /* The Mac interrupt code has moved to macglue.c */
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116 #define OK
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117
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118 #endif /* macintosh */
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120
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121 #ifndef OK
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122
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123 /* Default version -- for real operating systems and for Standard C */
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124
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125 #include <stdio.h>
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126 #include <string.h>
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127 #include <signal.h>
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128
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129 static int interrupted;
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130
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131 void
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132 PyErr_SetInterrupt()
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133 {
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134 interrupted = 1;
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135 }
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136
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137 /* ARGSUSED */
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138 static RETSIGTYPE
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139 #ifdef _M_IX86
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140 intcatcher(int sig) /* So the C compiler shuts up */
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141 #else /* _M_IX86 */
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142 intcatcher(sig)
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143 int sig; /* Not used by required by interface */
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144 #endif /* _M_IX86 */
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145 {
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146 extern void goaway PROTO((int));
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147 static char message[] =
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148 "python: to interrupt a truly hanging Python program, interrupt once more.\n";
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149 switch (interrupted++) {
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150 case 0:
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151 break;
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152 case 1:
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153 write(2, message, strlen(message));
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154 break;
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155 case 2:
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156 interrupted = 0;
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157 goaway(1);
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158 break;
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159 }
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160 signal(SIGINT, intcatcher);
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161 }
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162
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163 void
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164 initintr()
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165 {
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166 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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167 signal(SIGINT, intcatcher);
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168 #ifdef HAVE_SIGINTERRUPT
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169 /* This is for SunOS and other modern BSD derivatives.
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170 It means that system calls (like read()) are not restarted
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171 after an interrupt. This is necessary so interrupting a
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172 read() or readline() call works as expected.
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173 XXX On old BSD (pure 4.2 or older) you may have to do this
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174 differently! */
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175 siginterrupt(SIGINT, 1);
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176 #endif /* HAVE_SIGINTERRUPT */
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177 }
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178
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179 int
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180 intrcheck()
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181 {
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182 if (!interrupted)
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183 return 0;
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184 interrupted = 0;
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185 return 1;
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186 }
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187
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188 #endif /* !OK */