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annotate Modules/threadmodule.c @ 1179:9ae65ee09735 legacy-trunk

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Various changes. * Makefile: svmodule.c.proto and svgen.py are gone, svmodule.c came in their stead. Also, pass -DUSE_DL flag to thread.c and give the user a possibility to add the -DDEBUG to just thread.c. * ceval.c: init_save_thread() can be called more than once now. * svgen.py, svmodule.c.proto, svmodule.c: Removed prototype file and replaced it by the generated file. * thread.c: Added some more checks; added call to DL library when it is also used to tell it where the shared arena is so that DL can use some other area. * threadmodule.c: Call init_save_thread from another place. Also, added new function getlocklock() which does to lock objects what getfilefile does to file objects.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 06 Jan 1993 13:36:38 +0000
parents a31e07847063
children 2937897a7d8b
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1 /***********************************************************
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2 Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
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3 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 not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Thread module */
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26 /* Interface to Sjoerd's portable C thread library */
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27
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28 #include "allobjects.h"
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29 #include "modsupport.h"
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30 #include "ceval.h"
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31
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32 #include "thread.h"
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33
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34 int threads_started = 0;
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35
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36 object *ThreadError;
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37
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38
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39 /* Lock objects */
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40
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41 typedef struct {
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42 OB_HEAD
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43 type_lock lock_lock;
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44 } lockobject;
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45
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46 extern typeobject Locktype; /* Really static, forward */
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47
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48 #define is_lockobject(v) ((v)->ob_type == &Locktype)
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49
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50 type_lock
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51 getlocklock(lock)
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52 object *lock;
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53 {
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54 if (lock == NULL || !is_lockobject(lock))
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55 return NULL;
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56 else
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57 return ((lockobject *) lock)->lock_lock;
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58 }
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59
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60 static lockobject *
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61 newlockobject()
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62 {
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63 lockobject *self;
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64 self = NEWOBJ(lockobject, &Locktype);
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65 if (self == NULL)
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66 return NULL;
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67 self->lock_lock = allocate_lock();
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68 if (self->lock_lock == NULL) {
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69 DEL(self);
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70 self = NULL;
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71 err_setstr(ThreadError, "can't allocate lock");
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72 }
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73 return self;
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74 }
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75
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76 static void
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77 lock_dealloc(self)
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78 lockobject *self;
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79 {
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80 /* Unlock the lock so it's safe to free it */
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81 acquire_lock(self->lock_lock, 0);
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82 release_lock(self->lock_lock);
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83
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84 free_lock(self->lock_lock);
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85 DEL(self);
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86 }
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87
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88 static object *
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89 lock_acquire_lock(self, args)
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90 lockobject *self;
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91 object *args;
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92 {
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93 int i;
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94
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95 if (args != NULL) {
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96 if (!getargs(args, "i", &i))
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97 return NULL;
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98 }
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99 else
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100 i = 1;
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101
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102 BGN_SAVE
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103 i = acquire_lock(self->lock_lock, i);
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104 END_SAVE
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105
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106 if (args == NULL) {
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107 INCREF(None);
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108 return None;
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109 }
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110 else
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111 return newintobject((long)i);
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112 }
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113
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114 static object *
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115 lock_release_lock(self, args)
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116 lockobject *self;
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117 object *args;
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118 {
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119 if (!getnoarg(args))
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120 return NULL;
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121
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122 /* Sanity check: the lock must be locked */
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123 if (acquire_lock(self->lock_lock, 0)) {
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124 release_lock(self->lock_lock);
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125 err_setstr(ThreadError, "release unlocked lock");
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126 return NULL;
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127 }
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128
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129 release_lock(self->lock_lock);
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130 INCREF(None);
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131 return None;
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132 }
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133
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134 static object *
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135 lock_locked_lock(self, args)
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136 lockobject *self;
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137 object *args;
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138 {
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139 if (!getnoarg(args))
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140 return NULL;
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141
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142 if (acquire_lock(self->lock_lock, 0)) {
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143 release_lock(self->lock_lock);
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144 return newintobject(0L);
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145 }
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146 return newintobject(1L);
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147 }
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148
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149 static struct methodlist lock_methods[] = {
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150 {"acquire_lock", lock_acquire_lock},
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151 {"acquire", lock_acquire_lock},
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152 {"release_lock", lock_release_lock},
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153 {"release", lock_release_lock},
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154 {"locked_lock", lock_locked_lock},
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155 {"locked", lock_locked_lock},
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156 {NULL, NULL} /* sentinel */
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157 };
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158
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159 static object *
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160 lock_getattr(self, name)
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161 lockobject *self;
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162 char *name;
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163 {
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164 return findmethod(lock_methods, (object *)self, name);
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165 }
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166
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167 static typeobject Locktype = {
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168 OB_HEAD_INIT(&Typetype)
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169 0, /*ob_size*/
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170 "lock", /*tp_name*/
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171 sizeof(lockobject), /*tp_size*/
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172 0, /*tp_itemsize*/
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173 /* methods */
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174 lock_dealloc, /*tp_dealloc*/
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175 0, /*tp_print*/
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176 lock_getattr, /*tp_getattr*/
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177 0, /*tp_setattr*/
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178 0, /*tp_compare*/
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179 0, /*tp_repr*/
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180 };
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181
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182
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183 /* Module functions */
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184
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185 static void
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186 t_bootstrap(args_raw)
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187 void *args_raw;
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188 {
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189 object *args = (object *) args_raw;
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190 object *func, *arg, *res;
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191
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192 threads_started++;
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193
923
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194 restore_thread((void *)NULL);
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195 func = gettupleitem(args, 0);
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196 arg = gettupleitem(args, 1);
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197 res = call_object(func, arg);
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198 DECREF(arg); /* Matches the INCREF(arg) in thread_start_new_thread */
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199 if (res == NULL) {
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200 fprintf(stderr, "Unhandled exception in thread:\n");
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201 print_error(); /* From pythonmain.c */
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202 }
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203 (void) save_thread();
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204 exit_thread();
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205 }
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206
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207 static object *
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208 thread_start_new_thread(self, args)
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209 object *self; /* Not used */
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210 object *args;
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211 {
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212 object *func, *arg;
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213
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214 if (!getargs(args, "(OO)", &func, &arg))
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215 return NULL;
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216 INCREF(args);
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217 /* Initialize the interpreter's stack save/restore mechanism */
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218 init_save_thread();
923
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219 if (!start_new_thread(t_bootstrap, (void*) args)) {
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220 DECREF(args);
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221 err_setstr(ThreadError, "can't start new thread\n");
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222 return NULL;
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223 }
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224 /* Otherwise the DECREF(args) is done by t_bootstrap */
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225 INCREF(None);
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226 return None;
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227 }
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228
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229 static object *
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230 thread_exit_thread(self, args)
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231 object *self; /* Not used */
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232 object *args;
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233 {
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234 if (!getnoarg(args))
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235 return NULL;
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236 (void) save_thread();
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237 exit_thread();
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238 for (;;) { } /* Should not be reached */
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239 }
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240
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241 static object *
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242 thread_exit_prog(self, args)
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243 object *self; /* Not used */
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244 object *args;
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245 {
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246 int sts;
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247 if (!getargs(args, "i", &sts))
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248 return NULL;
961
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diff changeset
249 goaway(sts); /* Calls exit_prog(sts) or _exit_prog(sts) */
923
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250 for (;;) { } /* Should not be reached */
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251 }
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252
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253 static object *
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254 thread_allocate_lock(self, args)
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255 object *self; /* Not used */
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256 object *args;
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diff changeset
257 {
72aceed365d4 * Makefile adapted to changes below.
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258 if (!getnoarg(args))
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259 return NULL;
926
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diff changeset
260 return (object *) newlockobject();
923
72aceed365d4 * Makefile adapted to changes below.
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261 }
72aceed365d4 * Makefile adapted to changes below.
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262
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263 static struct methodlist thread_methods[] = {
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
264 {"start_new_thread", thread_start_new_thread},
72aceed365d4 * Makefile adapted to changes below.
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265 {"start_new", thread_start_new_thread},
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diff changeset
266 {"allocate_lock", thread_allocate_lock},
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
267 {"allocate", thread_allocate_lock},
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
268 {"exit_thread", thread_exit_thread},
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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269 {"exit", thread_exit_thread},
72aceed365d4 * Makefile adapted to changes below.
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270 {"exit_prog", thread_exit_prog},
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271 {NULL, NULL} /* sentinel */
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272 };
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273
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274
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275 /* Initialization function */
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276
72aceed365d4 * Makefile adapted to changes below.
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277 void
72aceed365d4 * Makefile adapted to changes below.
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278 initthread()
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
279 {
72aceed365d4 * Makefile adapted to changes below.
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280 object *m, *d, *x;
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281
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
282 /* Create the module and add the functions */
72aceed365d4 * Makefile adapted to changes below.
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283 m = initmodule("thread", thread_methods);
72aceed365d4 * Makefile adapted to changes below.
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284
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285 /* Add a symbolic constant */
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
286 d = getmoduledict(m);
72aceed365d4 * Makefile adapted to changes below.
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diff changeset
287 ThreadError = newstringobject("thread.error");
72aceed365d4 * Makefile adapted to changes below.
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288 INCREF(ThreadError);
72aceed365d4 * Makefile adapted to changes below.
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289 dictinsert(d, "error", ThreadError);
72aceed365d4 * Makefile adapted to changes below.
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290
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291 /* Check for errors */
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
parents:
diff changeset
292 if (err_occurred())
72aceed365d4 * Makefile adapted to changes below.
Guido van Rossum <guido@python.org>
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293 fatal("can't initialize module thread");
72aceed365d4 * Makefile adapted to changes below.
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294
72aceed365d4 * Makefile adapted to changes below.
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295 /* Initialize the C thread library */
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diff changeset
296 init_thread();
72aceed365d4 * Makefile adapted to changes below.
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297 }