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1 /* |
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2 |
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3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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 3 of the License, or (at your |
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10 option) any 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, see |
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19 <http://www.gnu.org/licenses/>. |
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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 (__WIN32__) && ! defined (_POSIX_VERSION) |
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37 |
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38 #include <windows.h> |
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39 #undef min |
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40 #undef max |
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41 |
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42 CRUFT_API extern void w32_sigint_init (void); /* setup */ |
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43 CRUFT_API extern void w32_raise_final (void); /* tear down */ |
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44 CRUFT_API extern void w32_raise (int sig); /* raise signal in main thread */ |
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45 CRUFT_API extern int w32_in_main_thread (void); /* return true if in main thread */ |
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46 |
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47 #endif |
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48 |
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49 #if defined (OCTAVE_HAVE_SIG_JUMP) |
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50 |
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51 typedef sigjmp_buf octave_jmp_buf; |
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52 |
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53 #define octave_set_current_context sigsetjmp (current_context, 1) |
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54 |
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55 #else |
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56 |
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57 typedef jmp_buf octave_jmp_buf; |
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58 |
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59 #define octave_set_current_context setjmp (current_context) |
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60 |
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61 #endif |
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62 |
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63 CRUFT_API extern octave_jmp_buf current_context; |
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64 |
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65 CRUFT_API extern void octave_save_current_context (void *); |
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66 |
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67 CRUFT_API extern void octave_restore_current_context (void *); |
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68 |
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69 CRUFT_API extern void octave_jump_to_enclosing_context (void) GCC_ATTR_NORETURN; |
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70 |
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71 CRUFT_API extern void octave_save_signal_mask (void); |
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72 |
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73 CRUFT_API extern void octave_restore_signal_mask (void); |
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74 |
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75 #ifdef __cplusplus |
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76 class |
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77 octave_interrupt_exception |
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78 { |
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79 }; |
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80 #endif |
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81 |
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82 CRUFT_API extern sig_atomic_t octave_interrupt_immediately; |
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83 |
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84 /* |
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85 > 0: interrupt pending |
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86 0: no interrupt pending |
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87 < 0: handling interrupt |
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88 */ |
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89 CRUFT_API extern sig_atomic_t octave_interrupt_state; |
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90 |
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91 CRUFT_API extern sig_atomic_t octave_allocation_error; |
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92 |
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93 CRUFT_API extern sig_atomic_t octave_signal_caught; |
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94 |
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95 CRUFT_API extern void octave_handle_signal (void); |
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96 |
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97 CRUFT_API extern void octave_throw_interrupt_exception (void) GCC_ATTR_NORETURN; |
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98 |
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99 CRUFT_API extern void octave_throw_bad_alloc (void) GCC_ATTR_NORETURN; |
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100 |
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101 #define OCTAVE_QUIT \ |
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102 do \ |
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103 { \ |
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104 if (octave_signal_caught) \ |
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105 { \ |
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106 octave_signal_caught = 0; \ |
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107 octave_handle_signal (); \ |
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108 } \ |
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109 } \ |
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110 while (0) |
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111 |
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112 /* Normally, you just want to use |
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113 |
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114 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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115 ... some code that calls a "foreign" function ... |
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116 END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE; |
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117 |
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118 but sometimes it is useful to do something like |
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119 |
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120 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; |
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121 ... custom code here, normally ending in a call to |
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122 octave_throw_interrupt_exception ... |
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123 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2; |
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124 |
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125 so that you can perform extra clean up operations before throwing |
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126 the interrupt exception. */ |
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127 |
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128 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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129 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1; \ |
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130 octave_throw_interrupt_exception (); \ |
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131 BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 |
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132 |
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133 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_1 \ |
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134 do \ |
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135 { \ |
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136 octave_jmp_buf saved_context; \ |
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137 \ |
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138 octave_save_current_context (saved_context); \ |
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139 \ |
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140 if (octave_set_current_context) \ |
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141 { \ |
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142 octave_restore_current_context (saved_context) |
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143 |
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144 #define BEGIN_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE_2 \ |
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145 } \ |
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146 else \ |
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147 { \ |
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148 octave_interrupt_immediately++ |
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149 |
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150 #define END_INTERRUPT_IMMEDIATELY_IN_FOREIGN_CODE \ |
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151 octave_interrupt_immediately--; \ |
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152 octave_restore_current_context (saved_context); \ |
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153 } \ |
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154 } \ |
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155 while (0) |
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156 |
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157 #ifdef __cplusplus |
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158 |
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159 #define BEGIN_INTERRUPT_WITH_EXCEPTIONS \ |
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160 sig_atomic_t saved_octave_interrupt_immediately = octave_interrupt_immediately; \ |
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161 \ |
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162 try \ |
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163 { \ |
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164 octave_interrupt_immediately = 0; |
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165 |
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166 #define END_INTERRUPT_WITH_EXCEPTIONS \ |
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167 } \ |
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168 catch (octave_interrupt_exception) \ |
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169 { \ |
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170 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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171 octave_jump_to_enclosing_context (); \ |
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172 } \ |
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173 catch (std::bad_alloc) \ |
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174 { \ |
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175 octave_interrupt_immediately = saved_octave_interrupt_immediately; \ |
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176 octave_allocation_error = 1; \ |
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177 octave_jump_to_enclosing_context (); \ |
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178 } \ |
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179 \ |
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180 octave_interrupt_immediately = saved_octave_interrupt_immediately |
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181 #endif |
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182 |
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183 #ifdef __cplusplus |
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184 } |
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185 |
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186 /* These should only be declared for C++ code, and should also be |
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187 outside of any extern "C" block. */ |
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188 |
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189 extern CRUFT_API void (*octave_signal_hook) (void); |
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190 extern CRUFT_API void (*octave_interrupt_hook) (void); |
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191 extern CRUFT_API void (*octave_bad_alloc_hook) (void); |
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192 |
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193 #endif |
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194 |
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195 #endif |
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196 |
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197 /* |
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198 ;;; Local Variables: *** |
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199 ;;; mode: C++ *** |
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200 ;;; End: *** |
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201 */ |
