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b7f3516f | 1 | /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
9482a297 MV |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | ||
1bbd0b84 GB |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
45 | ||
9482a297 MV |
46 | #include "_scm.h" |
47 | #include "print.h" | |
48 | #include "smob.h" | |
56366edf | 49 | #include "genio.h" |
b3460a50 | 50 | #include "dynwind.h" |
9482a297 | 51 | #include "fluids.h" |
b3460a50 MV |
52 | #include "alist.h" |
53 | #include "eval.h" | |
9482a297 MV |
54 | |
55 | #define INITIAL_FLUIDS 10 | |
1bbd0b84 | 56 | #include "scm_validate.h" |
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57 | |
58 | static volatile int n_fluids; | |
59 | long scm_tc16_fluid; | |
60 | ||
61 | SCM | |
62 | scm_make_initial_fluids () | |
63 | { | |
64 | return scm_make_vector (SCM_MAKINUM (INITIAL_FLUIDS), | |
a8741caa | 65 | SCM_BOOL_F); |
9482a297 MV |
66 | } |
67 | ||
9482a297 | 68 | static void |
1bbd0b84 | 69 | grow_fluids (scm_root_state *root_state,int new_length) |
9482a297 MV |
70 | { |
71 | SCM old_fluids, new_fluids; | |
72 | int old_length, i; | |
73 | ||
74 | old_fluids = root_state->fluids; | |
9482a297 | 75 | old_length = SCM_LENGTH (old_fluids); |
a8741caa | 76 | new_fluids = scm_make_vector (SCM_MAKINUM (new_length), SCM_BOOL_F); |
9482a297 MV |
77 | i = 0; |
78 | while (i < old_length) | |
79 | { | |
80 | SCM_VELTS(new_fluids)[i] = SCM_VELTS(old_fluids)[i]; | |
81 | i++; | |
82 | } | |
83 | while (i < new_length) | |
84 | { | |
85 | SCM_VELTS(new_fluids)[i] = SCM_BOOL_F; | |
86 | i++; | |
87 | } | |
88 | ||
89 | root_state->fluids = new_fluids; | |
90 | } | |
91 | ||
92 | void | |
6e8d25a6 | 93 | scm_copy_fluids (scm_root_state *root_state) |
9482a297 MV |
94 | { |
95 | grow_fluids (root_state, SCM_LENGTH(root_state->fluids)); | |
96 | } | |
97 | ||
9482a297 | 98 | static int |
1bbd0b84 | 99 | print_fluid (SCM exp, SCM port, scm_print_state *pstate) |
9482a297 | 100 | { |
b7f3516f | 101 | scm_puts ("#<fluid ", port); |
9482a297 | 102 | scm_intprint (SCM_FLUID_NUM (exp), 10, port); |
b7f3516f | 103 | scm_putc ('>', port); |
9482a297 MV |
104 | return 1; |
105 | } | |
106 | ||
9482a297 MV |
107 | static |
108 | int next_fluid_num () | |
109 | { | |
110 | int n; | |
eadd48de | 111 | #ifdef USE_THREADS |
9482a297 | 112 | SCM_THREAD_CRITICAL_SECTION_START; |
eadd48de | 113 | #endif |
9482a297 | 114 | n = n_fluids++; |
eadd48de | 115 | #ifdef USE_THREADS |
9482a297 | 116 | SCM_THREAD_CRITICAL_SECTION_END; |
eadd48de | 117 | #endif |
9482a297 MV |
118 | return n; |
119 | } | |
120 | ||
1bbd0b84 GB |
121 | GUILE_PROC (scm_make_fluid, "make-fluid", 0, 0, 0, |
122 | (), | |
123 | "") | |
124 | #define FUNC_NAME s_scm_make_fluid | |
9482a297 | 125 | { |
9482a297 MV |
126 | int n; |
127 | ||
128 | SCM_DEFER_INTS; | |
129 | n = next_fluid_num (); | |
23a62151 | 130 | SCM_RETURN_NEWSMOB (scm_tc16_fluid, n); |
9482a297 | 131 | } |
1bbd0b84 | 132 | #undef FUNC_NAME |
9482a297 | 133 | |
1bbd0b84 GB |
134 | GUILE_PROC (scm_fluid_p, "fluid?", 1, 0, 0, |
135 | (SCM fl), | |
136 | "") | |
137 | #define FUNC_NAME s_scm_fluid_p | |
b3460a50 | 138 | { |
0c95b57d | 139 | return SCM_BOOL(SCM_FLUIDP (fl)); |
b3460a50 | 140 | } |
1bbd0b84 | 141 | #undef FUNC_NAME |
b3460a50 | 142 | |
1bbd0b84 GB |
143 | GUILE_PROC (scm_fluid_ref, "fluid-ref", 1, 0, 0, |
144 | (SCM fl), | |
145 | "") | |
146 | #define FUNC_NAME s_scm_fluid_ref | |
9482a297 MV |
147 | { |
148 | int n; | |
149 | ||
1bbd0b84 | 150 | SCM_VALIDATE_FLUID(1,fl); |
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151 | |
152 | n = SCM_FLUID_NUM (fl); | |
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153 | |
154 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
155 | grow_fluids (scm_root, n+1); | |
156 | return SCM_VELTS(scm_root->fluids)[n]; | |
157 | } | |
1bbd0b84 | 158 | #undef FUNC_NAME |
9482a297 | 159 | |
1bbd0b84 GB |
160 | GUILE_PROC (scm_fluid_set_x, "fluid-set!", 2, 0, 0, |
161 | (SCM fl, SCM val), | |
162 | "") | |
163 | #define FUNC_NAME s_scm_fluid_set_x | |
9482a297 MV |
164 | { |
165 | int n; | |
166 | ||
1bbd0b84 | 167 | SCM_VALIDATE_FLUID(1,fl); |
9482a297 | 168 | n = SCM_FLUID_NUM (fl); |
9482a297 MV |
169 | |
170 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
171 | grow_fluids (scm_root, n+1); | |
172 | SCM_VELTS(scm_root->fluids)[n] = val; | |
173 | return val; | |
174 | } | |
1bbd0b84 | 175 | #undef FUNC_NAME |
9482a297 | 176 | |
b3460a50 | 177 | void |
1bbd0b84 | 178 | scm_swap_fluids (SCM fluids, SCM vals) |
b3460a50 MV |
179 | { |
180 | while (SCM_NIMP (fluids)) | |
181 | { | |
182 | SCM fl = SCM_CAR (fluids); | |
183 | SCM old_val = scm_fluid_ref (fl); | |
184 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
185 | SCM_SETCAR (vals, old_val); | |
186 | fluids = SCM_CDR (fluids); | |
187 | vals = SCM_CDR (vals); | |
188 | } | |
189 | } | |
190 | ||
191 | /* Swap the fluid values in reverse order. This is important when the | |
192 | same fluid appears multiple times in the fluids list. */ | |
193 | ||
194 | void | |
1bbd0b84 | 195 | scm_swap_fluids_reverse (SCM fluids, SCM vals) |
b3460a50 MV |
196 | { |
197 | if (SCM_NIMP (fluids)) | |
198 | { | |
199 | SCM fl, old_val; | |
200 | ||
201 | scm_swap_fluids_reverse (SCM_CDR (fluids), SCM_CDR (vals)); | |
202 | fl = SCM_CAR (fluids); | |
203 | old_val = scm_fluid_ref (fl); | |
204 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
205 | SCM_SETCAR (vals, old_val); | |
206 | } | |
207 | } | |
208 | ||
1bbd0b84 GB |
209 | |
210 | static SCM | |
211 | apply_thunk (void *thunk) | |
212 | { | |
213 | return scm_apply ((SCM) thunk, SCM_EOL, SCM_EOL); | |
214 | } | |
215 | ||
216 | GUILE_PROC (scm_with_fluids, "with-fluids*", 3, 0, 0, | |
217 | (SCM fluids, SCM vals, SCM thunk), | |
218 | "") | |
219 | #define FUNC_NAME s_scm_with_fluids | |
220 | { | |
221 | return scm_internal_with_fluids (fluids, vals, apply_thunk, (void *)thunk); | |
222 | } | |
223 | #undef FUNC_NAME | |
b3460a50 MV |
224 | |
225 | SCM | |
1bbd0b84 | 226 | scm_internal_with_fluids (SCM fluids, SCM vals, SCM (*cproc) (), void *cdata) |
b3460a50 MV |
227 | { |
228 | SCM ans; | |
229 | ||
230 | int flen = scm_ilength (fluids); | |
231 | int vlen = scm_ilength (vals); | |
1bbd0b84 GB |
232 | SCM_ASSERT (flen >= 0, fluids, SCM_ARG1, s_scm_with_fluids); |
233 | SCM_ASSERT (vlen >= 0, vals, SCM_ARG2, s_scm_with_fluids); | |
b3460a50 | 234 | if (flen != vlen) |
1bbd0b84 | 235 | scm_out_of_range (s_scm_with_fluids, vals); |
b3460a50 MV |
236 | |
237 | scm_swap_fluids (fluids, vals); | |
238 | scm_dynwinds = scm_acons (fluids, vals, scm_dynwinds); | |
239 | ans = cproc (cdata); | |
240 | scm_dynwinds = SCM_CDR (scm_dynwinds); | |
241 | scm_swap_fluids_reverse (fluids, vals); | |
242 | return ans; | |
243 | } | |
244 | ||
b3460a50 | 245 | |
b3460a50 | 246 | |
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247 | void |
248 | scm_init_fluids () | |
249 | { | |
23a62151 MD |
250 | scm_tc16_fluid = scm_make_smob_type_mfpe ("fluid", 0, |
251 | NULL, NULL, print_fluid, NULL); | |
9482a297 MV |
252 | #include "fluids.x" |
253 | } |