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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 | ||
9482a297 MV |
42 | #include "_scm.h" |
43 | #include "print.h" | |
44 | #include "smob.h" | |
b3460a50 | 45 | #include "dynwind.h" |
9482a297 | 46 | #include "fluids.h" |
b3460a50 MV |
47 | #include "alist.h" |
48 | #include "eval.h" | |
9482a297 MV |
49 | |
50 | #define INITIAL_FLUIDS 10 | |
51 | ||
52 | static volatile int n_fluids; | |
53 | long scm_tc16_fluid; | |
54 | ||
55 | SCM | |
56 | scm_make_initial_fluids () | |
57 | { | |
58 | return scm_make_vector (SCM_MAKINUM (INITIAL_FLUIDS), | |
59 | SCM_BOOL_F, SCM_BOOL_F); | |
60 | } | |
61 | ||
62 | static void grow_fluids SCM_P ((scm_root_state *, int new_length)); | |
63 | static void | |
64 | grow_fluids (root_state, new_length) | |
65 | scm_root_state *root_state; | |
66 | int new_length; | |
67 | { | |
68 | SCM old_fluids, new_fluids; | |
69 | int old_length, i; | |
70 | ||
71 | old_fluids = root_state->fluids; | |
9482a297 | 72 | old_length = SCM_LENGTH (old_fluids); |
9482a297 MV |
73 | new_fluids = scm_make_vector (SCM_MAKINUM (new_length), |
74 | SCM_BOOL_F, SCM_BOOL_F); | |
75 | i = 0; | |
76 | while (i < old_length) | |
77 | { | |
78 | SCM_VELTS(new_fluids)[i] = SCM_VELTS(old_fluids)[i]; | |
79 | i++; | |
80 | } | |
81 | while (i < new_length) | |
82 | { | |
83 | SCM_VELTS(new_fluids)[i] = SCM_BOOL_F; | |
84 | i++; | |
85 | } | |
86 | ||
87 | root_state->fluids = new_fluids; | |
88 | } | |
89 | ||
90 | void | |
91 | scm_copy_fluids (root_state) | |
92 | scm_root_state *root_state; | |
93 | { | |
94 | grow_fluids (root_state, SCM_LENGTH(root_state->fluids)); | |
95 | } | |
96 | ||
97 | static int print_fluid SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
98 | static int | |
99 | print_fluid (exp, port, pstate) | |
100 | SCM exp; | |
101 | SCM port; | |
102 | scm_print_state *pstate; | |
103 | { | |
b7f3516f | 104 | scm_puts ("#<fluid ", port); |
9482a297 | 105 | scm_intprint (SCM_FLUID_NUM (exp), 10, port); |
b7f3516f | 106 | scm_putc ('>', port); |
9482a297 MV |
107 | return 1; |
108 | } | |
109 | ||
110 | static scm_smobfuns fluid_smob = { | |
111 | scm_mark0, | |
112 | scm_free0, | |
113 | print_fluid | |
114 | }; | |
115 | ||
116 | static | |
117 | int next_fluid_num () | |
118 | { | |
119 | int n; | |
eadd48de | 120 | #ifdef USE_THREADS |
9482a297 | 121 | SCM_THREAD_CRITICAL_SECTION_START; |
eadd48de | 122 | #endif |
9482a297 | 123 | n = n_fluids++; |
eadd48de | 124 | #ifdef USE_THREADS |
9482a297 | 125 | SCM_THREAD_CRITICAL_SECTION_END; |
eadd48de | 126 | #endif |
9482a297 MV |
127 | return n; |
128 | } | |
129 | ||
130 | SCM_PROC (s_make_fluid, "make-fluid", 0, 0, 0, scm_make_fluid); | |
131 | ||
132 | SCM | |
133 | scm_make_fluid () | |
134 | { | |
135 | SCM z; | |
136 | int n; | |
137 | ||
138 | SCM_DEFER_INTS; | |
139 | n = next_fluid_num (); | |
140 | SCM_NEWCELL (z); | |
141 | SCM_SETCAR (z, scm_tc16_fluid); | |
142 | SCM_SETCDR (z, n); | |
143 | SCM_ALLOW_INTS; | |
144 | ||
145 | return z; | |
146 | } | |
147 | ||
b3460a50 MV |
148 | SCM_PROC (s_fluid_p, "fluid?", 1, 0, 0, scm_fluid_p); |
149 | ||
150 | SCM | |
151 | scm_fluid_p (fl) | |
152 | SCM fl; | |
153 | { | |
154 | return (SCM_NIMP (fl) && SCM_FLUIDP (fl))? SCM_BOOL_T : SCM_BOOL_F; | |
155 | } | |
156 | ||
9482a297 MV |
157 | SCM_PROC (s_fluid_ref, "fluid-ref", 1, 0, 0, scm_fluid_ref); |
158 | ||
159 | SCM | |
160 | scm_fluid_ref (fl) | |
161 | SCM fl; | |
162 | { | |
163 | int n; | |
164 | ||
b3460a50 | 165 | SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), fl, SCM_ARG1, s_fluid_ref); |
9482a297 MV |
166 | |
167 | n = SCM_FLUID_NUM (fl); | |
9482a297 MV |
168 | |
169 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
170 | grow_fluids (scm_root, n+1); | |
171 | return SCM_VELTS(scm_root->fluids)[n]; | |
172 | } | |
173 | ||
174 | SCM_PROC (s_fluid_set_x, "fluid-set!", 2, 0, 0, scm_fluid_set_x); | |
175 | ||
176 | SCM | |
177 | scm_fluid_set_x (fl, val) | |
178 | SCM fl; | |
179 | SCM val; | |
180 | { | |
181 | int n; | |
182 | ||
b3460a50 | 183 | SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), fl, SCM_ARG1, s_fluid_set_x); |
9482a297 MV |
184 | |
185 | n = SCM_FLUID_NUM (fl); | |
9482a297 MV |
186 | |
187 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
188 | grow_fluids (scm_root, n+1); | |
189 | SCM_VELTS(scm_root->fluids)[n] = val; | |
190 | return val; | |
191 | } | |
192 | ||
b3460a50 MV |
193 | void |
194 | scm_swap_fluids (fluids, vals) | |
195 | SCM fluids, vals; | |
196 | { | |
197 | while (SCM_NIMP (fluids)) | |
198 | { | |
199 | SCM fl = SCM_CAR (fluids); | |
200 | SCM old_val = scm_fluid_ref (fl); | |
201 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
202 | SCM_SETCAR (vals, old_val); | |
203 | fluids = SCM_CDR (fluids); | |
204 | vals = SCM_CDR (vals); | |
205 | } | |
206 | } | |
207 | ||
208 | /* Swap the fluid values in reverse order. This is important when the | |
209 | same fluid appears multiple times in the fluids list. */ | |
210 | ||
211 | void | |
212 | scm_swap_fluids_reverse (fluids, vals) | |
213 | SCM fluids, vals; | |
214 | { | |
215 | if (SCM_NIMP (fluids)) | |
216 | { | |
217 | SCM fl, old_val; | |
218 | ||
219 | scm_swap_fluids_reverse (SCM_CDR (fluids), SCM_CDR (vals)); | |
220 | fl = SCM_CAR (fluids); | |
221 | old_val = scm_fluid_ref (fl); | |
222 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
223 | SCM_SETCAR (vals, old_val); | |
224 | } | |
225 | } | |
226 | ||
227 | SCM_PROC (s_with_fluids, "with-fluids*", 3, 0, 0, scm_with_fluids); | |
228 | ||
229 | SCM | |
230 | scm_internal_with_fluids (fluids, vals, cproc, cdata) | |
231 | SCM fluids, vals; | |
232 | SCM (*cproc) (); | |
233 | void *cdata; | |
234 | { | |
235 | SCM ans; | |
236 | ||
237 | int flen = scm_ilength (fluids); | |
238 | int vlen = scm_ilength (vals); | |
239 | SCM_ASSERT (flen >= 0, fluids, SCM_ARG1, s_with_fluids); | |
240 | SCM_ASSERT (vlen >= 0, vals, SCM_ARG2, s_with_fluids); | |
241 | if (flen != vlen) | |
242 | scm_out_of_range (s_with_fluids, vals); | |
243 | ||
244 | scm_swap_fluids (fluids, vals); | |
245 | scm_dynwinds = scm_acons (fluids, vals, scm_dynwinds); | |
246 | ans = cproc (cdata); | |
247 | scm_dynwinds = SCM_CDR (scm_dynwinds); | |
248 | scm_swap_fluids_reverse (fluids, vals); | |
249 | return ans; | |
250 | } | |
251 | ||
252 | static SCM | |
253 | apply_thunk (void *thunk) | |
254 | { | |
255 | return scm_apply ((SCM) thunk, SCM_EOL, SCM_EOL); | |
256 | } | |
257 | ||
258 | SCM | |
259 | scm_with_fluids (fluids, vals, thunk) | |
260 | SCM fluids, vals, thunk; | |
261 | { | |
262 | return scm_internal_with_fluids (fluids, vals, apply_thunk, (void *)thunk); | |
263 | } | |
264 | ||
9482a297 MV |
265 | void |
266 | scm_init_fluids () | |
267 | { | |
268 | scm_tc16_fluid = scm_newsmob(&fluid_smob); | |
269 | #include "fluids.x" | |
270 | } |