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1 /* |
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2 |
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3 Copyright (C) 2002 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_quit_h) |
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25 #define octave_quit_h 1 |
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26 |
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27 #ifdef __cplusplus |
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28 #include <new> |
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29 extern "C" { |
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30 #endif |
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31 |
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32 #include <stdio.h> |
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33 |
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34 #include <signal.h> |
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35 #include <setjmp.h> |
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36 |
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37 #if defined (__WIN32__) && ! defined (_POSIX_VERSION) |
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38 |
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39 #include <windows.h> |
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40 |
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41 CRUFT_API extern void w32_sigint_init (void); /* setup */ |
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42 CRUFT_API extern void w32_raise_final (void); /* tear down */ |
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43 CRUFT_API extern void w32_raise (int sig); /* raise signal in main thread */ |
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44 CRUFT_API extern int w32_in_main_thread (void); /* return true if in main thread */ |
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45 |
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46 #endif |
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47 |
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48 #if defined (OCTAVE_HAVE_SIG_JUMP) |
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49 |
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50 typedef sigjmp_buf octave_jmp_buf; |
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51 |
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52 #define octave_set_current_context sigsetjmp (current_context, 1) |
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53 |
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54 #else |
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55 |
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56 typedef jmp_buf octave_jmp_buf; |
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57 |
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58 #define octave_set_current_context setjmp (current_context) |
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59 |
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60 #endif |
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61 |
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62 CRUFT_API extern octave_jmp_buf current_context; |
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63 |
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64 CRUFT_API extern void octave_save_current_context (void *); |
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65 |
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66 CRUFT_API extern void octave_restore_current_context (void *); |
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67 |
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68 CRUFT_API extern void octave_jump_to_enclosing_context (void) GCC_ATTR_NORETURN; |
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69 |
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70 CRUFT_API extern void octave_save_signal_mask (void); |
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71 |
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72 CRUFT_API extern void octave_restore_signal_mask (void); |
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73 |
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74 #ifdef __cplusplus |
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75 class |
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76 octave_interrupt_exception |
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77 { |
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78 }; |
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79 #endif |
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80 |
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81 CRUFT_API extern sig_atomic_t octave_interrupt_immediately; |
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82 |
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83 /* |
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84 > 0: interrupt pending |
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85 0: no interrupt pending |
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86 < 0: handling interrupt |
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87 */ |
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88 CRUFT_API extern sig_atomic_t octave_interrupt_state; |
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89 |
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90 CRUFT_API extern sig_atomic_t octave_allocation_error; |
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91 |
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92 CRUFT_API extern sig_atomic_t octave_signal_caught; |
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93 |
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94 CRUFT_API extern void octave_handle_signal (void); |
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95 |
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96 CRUFT_API extern void octave_throw_interrupt_exception (void) GCC_ATTR_NORETURN; |
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97 |
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98 CRUFT_API extern void octave_throw_bad_alloc (void) GCC_ATTR_NORETURN; |
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99 |
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100 #define OCTAVE_QUIT \ |
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101 do \ |
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102 { \ |
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103 if (octave_signal_caught) \ |
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104 { \ |
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105 octave_signal_caught = 0; \ |
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106 octave_handle_signal (); \ |
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107 } \ |
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108 } \ |
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109 while (0) |
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110 |
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111 /* Normally, you just want to use |
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112 |
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113 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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114 ... some code that calls a "foreign" function ... |
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115 END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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116 |
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117 but sometimes it is useful to do something like |
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118 |
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119 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; |
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120 ... custom code here, normally ending in a call to |
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121 octave_throw_interrupt_exception ... |
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122 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2; |
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123 |
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124 so that you can perform extra clean up operations before throwing |
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125 the interrupt exception. */ |
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126 |
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127 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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128 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; \ |
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129 octave_throw_interrupt_exception (); \ |
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130 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 |
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131 |
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132 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1 \ |
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133 do \ |
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134 { \ |
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135 octave_jmp_buf saved_context; \ |
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136 \ |
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137 octave_save_current_context (saved_context); \ |
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138 \ |
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139 if (octave_set_current_context) \ |
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140 { \ |
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141 octave_restore_current_context (saved_context) |
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142 |
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143 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 \ |
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144 } \ |
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145 else \ |
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146 { \ |
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147 octave_interrupt_immediately++ |
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148 |
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149 #define END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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150 octave_interrupt_immediately--; \ |
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151 octave_restore_current_context (saved_context); \ |
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152 } \ |
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153 } \ |
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154 while (0) |
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155 |
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156 #ifdef __cplusplus |
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157 |
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158 #define BEGIN_INTERRUPT_WITH_EXCEPTIONS \ |
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159 sig_atomic_t saved_octave_interrupt_immediately = octave_interrupt_immediately; \ |
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160 \ |
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161 try \ |
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162 { \ |
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163 octave_interrupt_immediately = 0; |
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164 |
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165 #define END_INTERRUPT_WITH_EXCEPTIONS \ |
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166 } \ |
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167 catch (octave_interrupt_exception) \ |
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168 { \ |
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169 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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170 octave_jump_to_enclosing_context (); \ |
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171 } \ |
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172 catch (std::bad_alloc) \ |
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173 { \ |
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174 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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175 octave_allocation_error = 1; \ |
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176 octave_jump_to_enclosing_context (); \ |
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177 } \ |
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178 \ |
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179 octave_interrupt_immediately = saved_octave_interrupt_immediately |
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180 #endif |
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181 |
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182 #ifdef __cplusplus |
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183 } |
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184 |
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185 /* These should only be declared for C++ code, and should also be |
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186 outside of any extern "C" block. */ |
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187 |
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188 extern CRUFT_API void (*octave_signal_hook) (void); |
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189 extern CRUFT_API void (*octave_interrupt_hook) (void); |
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190 extern CRUFT_API void (*octave_bad_alloc_hook) (void); |
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191 |
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192 #endif |
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193 |
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194 #endif |
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195 |
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196 /* |
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197 ;;; Local Variables: *** |
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198 ;;; mode: C++ *** |
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199 ;;; End: *** |
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200 */ |
