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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_quit_h) |
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24 #define octave_quit_h 1 |
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25 |
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26 #ifdef __cplusplus |
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27 #include <new> |
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28 extern "C" { |
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29 #endif |
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30 |
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31 #include <stdio.h> |
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32 |
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33 #include <signal.h> |
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34 #include <setjmp.h> |
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35 |
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36 #if defined (OCTAVE_HAVE_SIG_JUMP) |
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37 |
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38 typedef sigjmp_buf octave_jmp_buf; |
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39 |
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40 #define octave_set_current_context sigsetjmp (current_context, 1) |
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41 |
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42 #else |
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43 |
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44 typedef jmp_buf octave_jmp_buf; |
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45 |
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46 #define octave_set_current_context setjmp (current_context) |
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47 |
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48 #endif |
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49 |
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50 extern octave_jmp_buf current_context; |
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51 |
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52 extern void octave_save_current_context (void *); |
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53 |
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54 extern void octave_restore_current_context (void *); |
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55 |
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56 extern void octave_jump_to_enclosing_context (void) GCC_ATTR_NORETURN; |
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57 |
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58 extern void octave_save_signal_mask (void); |
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59 |
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60 extern void octave_restore_signal_mask (void); |
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61 |
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62 #ifdef __cplusplus |
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63 class |
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64 octave_interrupt_exception |
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65 { |
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66 }; |
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67 #endif |
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68 |
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69 extern sig_atomic_t octave_interrupt_immediately; |
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70 |
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71 // > 0: interrupt pending |
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72 // 0: no interrupt pending |
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73 // < 0: handling interrupt |
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74 // |
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75 extern sig_atomic_t octave_interrupt_state; |
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76 |
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77 extern sig_atomic_t octave_allocation_error; |
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78 |
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79 extern void octave_throw_interrupt_exception (void) GCC_ATTR_NORETURN; |
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80 |
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81 extern void octave_throw_bad_alloc (void) GCC_ATTR_NORETURN; |
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82 |
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83 #define OCTAVE_QUIT \ |
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84 do \ |
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85 { \ |
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86 if (octave_interrupt_state > 0) \ |
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87 { \ |
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88 octave_interrupt_state = -1; \ |
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89 octave_throw_interrupt_exception (); \ |
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90 } \ |
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91 } \ |
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92 while (0) |
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93 |
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94 /* Normally, you just want to use |
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95 |
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96 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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97 ... some code that calls a "foreign" function ... |
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98 END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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99 |
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100 but sometimes it is useful to do something like |
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101 |
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102 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; |
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103 ... custom code here, normally ending in a call to |
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104 octave_throw_interrupt_exception ... |
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105 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2; |
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106 |
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107 so that you can perform extra clean up operations before throwing |
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108 the interrupt exception. */ |
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109 |
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110 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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111 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; \ |
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112 octave_throw_interrupt_exception (); \ |
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113 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 |
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114 |
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115 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1 \ |
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116 do \ |
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117 { \ |
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118 octave_jmp_buf saved_context; \ |
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119 \ |
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120 octave_save_current_context ((char *) saved_context); \ |
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121 \ |
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122 if (octave_set_current_context) \ |
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123 { \ |
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124 octave_restore_current_context ((char *) saved_context) |
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125 |
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126 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 \ |
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127 } \ |
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128 else \ |
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129 { \ |
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130 octave_interrupt_immediately++ |
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131 |
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132 #define END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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133 octave_interrupt_immediately--; \ |
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134 octave_restore_current_context ((char *) saved_context); \ |
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135 } \ |
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136 } \ |
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137 while (0) |
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138 |
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139 #ifdef __cplusplus |
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140 |
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141 #define BEGIN_INTERRUPT_WITH_EXCEPTIONS \ |
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142 sig_atomic_t saved_octave_interrupt_immediately = octave_interrupt_immediately; \ |
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143 \ |
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144 try \ |
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145 { \ |
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146 octave_interrupt_immediately = 0; |
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147 |
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148 #define END_INTERRUPT_WITH_EXCEPTIONS \ |
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149 } \ |
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150 catch (octave_interrupt_exception) \ |
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151 { \ |
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152 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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153 octave_jump_to_enclosing_context (); \ |
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154 } \ |
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155 catch (std::bad_alloc) \ |
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156 { \ |
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157 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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158 octave_allocation_error = 1; \ |
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159 octave_jump_to_enclosing_context (); \ |
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160 } \ |
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161 \ |
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162 octave_interrupt_immediately = saved_octave_interrupt_immediately |
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163 #endif |
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164 |
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165 #ifdef __cplusplus |
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166 } |
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167 |
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168 /* These should only be declared for C++ code, and should also be |
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169 outside of any extern "C" block. */ |
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170 |
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171 extern void (*octave_interrupt_hook) (void); |
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172 extern void (*octave_bad_alloc_hook) (void); |
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173 |
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174 #endif |
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175 |
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176 #endif |
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177 |
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178 /* |
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179 ;;; Local Variables: *** |
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180 ;;; mode: C++ *** |
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181 ;;; End: *** |
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182 */ |
