Commit | Line | Data |
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b8d8f8b9 MW |
1 | /* Copyright (C) 1996,1997,2000,2001, 2004, 2006, 2007, 2008, 2009, 2010, |
2 | * 2011, 2012, 2013 Free Software Foundation, Inc. | |
9482a297 | 3 | * |
73be1d9e | 4 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
5 | * modify it under the terms of the GNU Lesser General Public License |
6 | * as published by the Free Software Foundation; either version 3 of | |
7 | * the License, or (at your option) any later version. | |
9482a297 | 8 | * |
53befeb7 NJ |
9 | * This library is distributed in the hope that it will be useful, but |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
9482a297 | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
17 | * 02110-1301 USA | |
73be1d9e | 18 | */ |
9482a297 | 19 | |
dbb605f5 LC |
20 | #ifdef HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
23 | ||
cdd47ec7 | 24 | #include <alloca.h> |
9de87eea MV |
25 | #include <stdio.h> |
26 | #include <string.h> | |
1bbd0b84 | 27 | |
a0599745 MD |
28 | #include "libguile/_scm.h" |
29 | #include "libguile/print.h" | |
a0599745 MD |
30 | #include "libguile/dynwind.h" |
31 | #include "libguile/fluids.h" | |
32 | #include "libguile/alist.h" | |
33 | #include "libguile/eval.h" | |
34 | #include "libguile/ports.h" | |
143e0902 | 35 | #include "libguile/deprecation.h" |
a0599745 | 36 | #include "libguile/validate.h" |
bd5a75dc | 37 | #include "libguile/bdw-gc.h" |
9482a297 | 38 | |
bd5a75dc LC |
39 | /* Number of additional slots to allocate when ALLOCATED_FLUIDS is full. */ |
40 | #define FLUID_GROW 128 | |
9de87eea | 41 | |
bd5a75dc LC |
42 | /* Vector of allocated fluids indexed by fluid numbers. Access is protected by |
43 | FLUID_ADMIN_MUTEX. */ | |
44 | static void **allocated_fluids = NULL; | |
45 | static size_t allocated_fluids_len = 0; | |
9482a297 | 46 | |
9de87eea MV |
47 | static scm_i_pthread_mutex_t fluid_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
48 | ||
6f8d7b12 | 49 | #define IS_FLUID(x) SCM_FLUID_P (x) |
5ef71027 | 50 | #define FLUID_NUM(x) SCM_I_FLUID_NUM (x) |
9de87eea | 51 | |
5ef71027 AW |
52 | #define IS_DYNAMIC_STATE(x) SCM_I_DYNAMIC_STATE_P (x) |
53 | #define DYNAMIC_STATE_FLUIDS(x) SCM_I_DYNAMIC_STATE_FLUIDS (x) | |
9ea31741 | 54 | #define SET_DYNAMIC_STATE_FLUIDS(x, y) SCM_SET_CELL_WORD_1 ((x), (SCM_UNPACK (y))) |
9de87eea | 55 | |
9de87eea | 56 | |
8b039053 | 57 | \f |
bd5a75dc LC |
58 | /* Grow STATE so that it can hold up to ALLOCATED_FLUIDS_LEN fluids. This may |
59 | be more than necessary since ALLOCATED_FLUIDS is sparse and the current | |
60 | thread may not access all the fluids anyway. Memory usage could be improved | |
61 | by using a 2-level array as is done in glibc for pthread keys (TODO). */ | |
9482a297 | 62 | static void |
8b039053 | 63 | grow_dynamic_state (SCM state) |
9de87eea | 64 | { |
8b039053 LC |
65 | SCM new_fluids; |
66 | SCM old_fluids = DYNAMIC_STATE_FLUIDS (state); | |
bd5a75dc | 67 | size_t i, len, old_len = SCM_SIMPLE_VECTOR_LENGTH (old_fluids); |
9de87eea | 68 | |
bd5a75dc LC |
69 | /* Assume the assignment below is atomic. */ |
70 | len = allocated_fluids_len; | |
9de87eea | 71 | |
aafb4ed7 | 72 | new_fluids = scm_c_make_vector (len, SCM_UNDEFINED); |
8b039053 LC |
73 | |
74 | for (i = 0; i < old_len; i++) | |
75 | SCM_SIMPLE_VECTOR_SET (new_fluids, i, | |
76 | SCM_SIMPLE_VECTOR_REF (old_fluids, i)); | |
77 | SET_DYNAMIC_STATE_FLUIDS (state, new_fluids); | |
9482a297 MV |
78 | } |
79 | ||
9ea31741 AW |
80 | void |
81 | scm_i_fluid_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
9482a297 | 82 | { |
ed4d7cee | 83 | scm_puts ("#<fluid ", port); |
9de87eea | 84 | scm_intprint ((int) FLUID_NUM (exp), 10, port); |
ed4d7cee | 85 | scm_putc ('>', port); |
9482a297 MV |
86 | } |
87 | ||
45cf2428 AW |
88 | void |
89 | scm_i_dynamic_state_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
90 | { | |
91 | scm_puts ("#<dynamic-state ", port); | |
92 | scm_intprint (SCM_UNPACK (exp), 16, port); | |
93 | scm_putc ('>', port); | |
94 | } | |
95 | ||
bbb2ecd1 AW |
96 | void |
97 | scm_i_with_fluids_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
98 | { | |
99 | scm_puts ("#<with-fluids ", port); | |
100 | scm_intprint (SCM_UNPACK (exp), 16, port); | |
101 | scm_putc ('>', port); | |
102 | } | |
103 | ||
bd5a75dc LC |
104 | \f |
105 | /* Return a new fluid. */ | |
106 | static SCM | |
aafb4ed7 | 107 | new_fluid (SCM init) |
9482a297 | 108 | { |
bd5a75dc LC |
109 | SCM fluid; |
110 | size_t trial, n; | |
111 | ||
aafb4ed7 AW |
112 | /* Fluids hold the type tag and the fluid number in the first word, |
113 | and the default value in the second word. */ | |
114 | fluid = scm_cell (scm_tc7_fluid, SCM_UNPACK (init)); | |
bd5a75dc | 115 | SCM_SET_CELL_TYPE (fluid, scm_tc7_fluid); |
9de87eea | 116 | |
661ae7ab MV |
117 | scm_dynwind_begin (0); |
118 | scm_i_dynwind_pthread_mutex_lock (&fluid_admin_mutex); | |
9de87eea | 119 | |
bd5a75dc | 120 | for (trial = 0; trial < 2; trial++) |
9de87eea | 121 | { |
bd5a75dc | 122 | /* Look for a free fluid number. */ |
9de87eea | 123 | for (n = 0; n < allocated_fluids_len; n++) |
bd5a75dc LC |
124 | /* TODO: Use `__sync_bool_compare_and_swap' where available. */ |
125 | if (allocated_fluids[n] == NULL) | |
9de87eea | 126 | break; |
bd5a75dc LC |
127 | |
128 | if (trial == 0 && n >= allocated_fluids_len) | |
129 | /* All fluid numbers are in use. Run a GC and retry. Explicitly | |
130 | running the GC is costly and bad-style. We only do this because | |
131 | dynamic state fluid vectors would grow unreasonably if fluid numbers | |
132 | weren't reused. */ | |
133 | scm_i_gc ("fluids"); | |
9de87eea | 134 | } |
bd5a75dc LC |
135 | |
136 | if (n >= allocated_fluids_len) | |
9de87eea | 137 | { |
8b039053 | 138 | /* Grow the vector of allocated fluids. */ |
bd5a75dc LC |
139 | void **new_allocated_fluids = |
140 | scm_gc_malloc_pointerless ((allocated_fluids_len + FLUID_GROW) | |
141 | * sizeof (*allocated_fluids), | |
142 | "allocated fluids"); | |
9de87eea MV |
143 | |
144 | /* Copy over old values and initialize rest. GC can not run | |
145 | during these two operations since there is no safe point in | |
bd5a75dc LC |
146 | them. */ |
147 | memcpy (new_allocated_fluids, allocated_fluids, | |
148 | allocated_fluids_len * sizeof (*allocated_fluids)); | |
149 | memset (new_allocated_fluids + allocated_fluids_len, 0, | |
150 | FLUID_GROW * sizeof (*allocated_fluids)); | |
9de87eea | 151 | n = allocated_fluids_len; |
d3075c52 | 152 | |
8b039053 LC |
153 | /* Update the vector of allocated fluids. Dynamic states will |
154 | eventually be lazily grown to accomodate the new value of | |
155 | ALLOCATED_FLUIDS_LEN in `fluid-ref' and `fluid-set!'. */ | |
9de87eea MV |
156 | allocated_fluids = new_allocated_fluids; |
157 | allocated_fluids_len += FLUID_GROW; | |
9de87eea | 158 | } |
bd5a75dc LC |
159 | |
160 | allocated_fluids[n] = SCM2PTR (fluid); | |
aafb4ed7 | 161 | SCM_SET_CELL_WORD_0 (fluid, (scm_tc7_fluid | (n << 8))); |
bd5a75dc LC |
162 | |
163 | GC_GENERAL_REGISTER_DISAPPEARING_LINK (&allocated_fluids[n], | |
164 | SCM2PTR (fluid)); | |
165 | ||
661ae7ab | 166 | scm_dynwind_end (); |
0b77014f AW |
167 | |
168 | /* Now null out values. We could (and probably should) do this when | |
169 | the fluid is collected instead of now. */ | |
aafb4ed7 | 170 | scm_i_reset_fluid (n); |
0b77014f | 171 | |
bd5a75dc | 172 | return fluid; |
9482a297 MV |
173 | } |
174 | ||
aafb4ed7 AW |
175 | SCM |
176 | scm_make_fluid (void) | |
177 | { | |
178 | return new_fluid (SCM_BOOL_F); | |
179 | } | |
180 | ||
181 | SCM_DEFINE (scm_make_fluid_with_default, "make-fluid", 0, 1, 0, | |
182 | (SCM dflt), | |
f43622a2 AW |
183 | "Return a newly created fluid, whose initial value is @var{dflt},\n" |
184 | "or @code{#f} if @var{dflt} is not given.\n" | |
9de87eea MV |
185 | "Fluids are objects that can hold one\n" |
186 | "value per dynamic state. That is, modifications to this value are\n" | |
187 | "only visible to code that executes with the same dynamic state as\n" | |
188 | "the modifying code. When a new dynamic state is constructed, it\n" | |
189 | "inherits the values from its parent. Because each thread normally executes\n" | |
190 | "with its own dynamic state, you can use fluids for thread local storage.") | |
aafb4ed7 | 191 | #define FUNC_NAME s_scm_make_fluid_with_default |
9482a297 | 192 | { |
aafb4ed7 | 193 | return new_fluid (SCM_UNBNDP (dflt) ? SCM_BOOL_F : dflt); |
9482a297 | 194 | } |
1bbd0b84 | 195 | #undef FUNC_NAME |
9482a297 | 196 | |
e01163b5 | 197 | SCM_DEFINE (scm_make_unbound_fluid, "make-unbound-fluid", 0, 0, 0, |
ef94624e | 198 | (), |
e01163b5 AW |
199 | "Make a fluid that is initially unbound.") |
200 | #define FUNC_NAME s_scm_make_unbound_fluid | |
ef94624e | 201 | { |
aafb4ed7 | 202 | return new_fluid (SCM_UNDEFINED); |
ef94624e BT |
203 | } |
204 | #undef FUNC_NAME | |
205 | ||
a1ec6916 | 206 | SCM_DEFINE (scm_fluid_p, "fluid?", 1, 0, 0, |
ed4d7cee | 207 | (SCM obj), |
1e6808ea MG |
208 | "Return @code{#t} iff @var{obj} is a fluid; otherwise, return\n" |
209 | "@code{#f}.") | |
1bbd0b84 | 210 | #define FUNC_NAME s_scm_fluid_p |
b3460a50 | 211 | { |
9de87eea | 212 | return scm_from_bool (IS_FLUID (obj)); |
b3460a50 | 213 | } |
1bbd0b84 | 214 | #undef FUNC_NAME |
b3460a50 | 215 | |
9de87eea MV |
216 | int |
217 | scm_is_fluid (SCM obj) | |
218 | { | |
219 | return IS_FLUID (obj); | |
220 | } | |
221 | ||
ef94624e BT |
222 | /* Does not check type of `fluid'! */ |
223 | static SCM | |
224 | fluid_ref (SCM fluid) | |
9482a297 | 225 | { |
aafb4ed7 | 226 | SCM ret; |
9de87eea | 227 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 228 | |
8b039053 LC |
229 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) |
230 | { | |
8b039053 LC |
231 | /* Lazily grow the current thread's dynamic state. */ |
232 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
233 | ||
234 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
235 | } | |
236 | ||
aafb4ed7 AW |
237 | ret = SCM_SIMPLE_VECTOR_REF (fluids, FLUID_NUM (fluid)); |
238 | if (SCM_UNBNDP (ret)) | |
239 | return SCM_I_FLUID_DEFAULT (fluid); | |
240 | else | |
241 | return ret; | |
9482a297 | 242 | } |
ef94624e BT |
243 | |
244 | SCM_DEFINE (scm_fluid_ref, "fluid-ref", 1, 0, 0, | |
245 | (SCM fluid), | |
246 | "Return the value associated with @var{fluid} in the current\n" | |
247 | "dynamic root. If @var{fluid} has not been set, then return\n" | |
248 | "@code{#f}.") | |
249 | #define FUNC_NAME s_scm_fluid_ref | |
250 | { | |
251 | SCM val; | |
252 | SCM_VALIDATE_FLUID (1, fluid); | |
253 | val = fluid_ref (fluid); | |
254 | if (SCM_UNBNDP (val)) | |
255 | SCM_MISC_ERROR ("unbound fluid: ~S", | |
256 | scm_list_1 (fluid)); | |
257 | return val; | |
258 | } | |
1bbd0b84 | 259 | #undef FUNC_NAME |
9482a297 | 260 | |
a1ec6916 | 261 | SCM_DEFINE (scm_fluid_set_x, "fluid-set!", 2, 0, 0, |
ed4d7cee GB |
262 | (SCM fluid, SCM value), |
263 | "Set the value associated with @var{fluid} in the current dynamic root.") | |
1bbd0b84 | 264 | #define FUNC_NAME s_scm_fluid_set_x |
9482a297 | 265 | { |
9de87eea | 266 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 267 | |
ed4d7cee | 268 | SCM_VALIDATE_FLUID (1, fluid); |
8b039053 LC |
269 | |
270 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) | |
271 | { | |
8b039053 LC |
272 | /* Lazily grow the current thread's dynamic state. */ |
273 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
274 | ||
275 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
276 | } | |
277 | ||
9de87eea | 278 | SCM_SIMPLE_VECTOR_SET (fluids, FLUID_NUM (fluid), value); |
86f9f9ae | 279 | return SCM_UNSPECIFIED; |
9482a297 | 280 | } |
1bbd0b84 | 281 | #undef FUNC_NAME |
9482a297 | 282 | |
ef94624e BT |
283 | SCM_DEFINE (scm_fluid_unset_x, "fluid-unset!", 1, 0, 0, |
284 | (SCM fluid), | |
285 | "Unset the value associated with @var{fluid}.") | |
286 | #define FUNC_NAME s_scm_fluid_unset_x | |
287 | { | |
aafb4ed7 AW |
288 | /* FIXME: really unset the default value, too? The current test |
289 | suite demands it, but I would prefer not to. */ | |
290 | SCM_SET_CELL_OBJECT_1 (fluid, SCM_UNDEFINED); | |
ef94624e BT |
291 | return scm_fluid_set_x (fluid, SCM_UNDEFINED); |
292 | } | |
293 | #undef FUNC_NAME | |
294 | ||
295 | SCM_DEFINE (scm_fluid_bound_p, "fluid-bound?", 1, 0, 0, | |
296 | (SCM fluid), | |
297 | "Return @code{#t} iff @var{fluid} is bound to a value.\n" | |
298 | "Throw an error if @var{fluid} is not a fluid.") | |
299 | #define FUNC_NAME s_scm_fluid_bound_p | |
300 | { | |
301 | SCM val; | |
302 | SCM_VALIDATE_FLUID (1, fluid); | |
303 | val = fluid_ref (fluid); | |
304 | return scm_from_bool (! (SCM_UNBNDP (val))); | |
305 | } | |
306 | #undef FUNC_NAME | |
307 | ||
bb0229b5 AW |
308 | static SCM |
309 | apply_thunk (void *thunk) | |
b3460a50 | 310 | { |
bb0229b5 AW |
311 | return scm_call_0 (SCM_PACK (thunk)); |
312 | } | |
313 | ||
314 | SCM | |
315 | scm_i_make_with_fluids (size_t n, SCM *fluids, SCM *vals) | |
316 | { | |
317 | SCM ret; | |
318 | ||
319 | /* Ensure that there are no duplicates in the fluids set -- an N^2 operation, | |
320 | but N will usually be small, so perhaps that's OK. */ | |
321 | { | |
8dd01861 | 322 | size_t i, j; |
bb0229b5 | 323 | |
8dd01861 MW |
324 | for (j = n; j--;) |
325 | for (i = j; i--;) | |
d223c3fc | 326 | if (scm_is_eq (fluids[i], fluids[j])) |
bb0229b5 AW |
327 | { |
328 | vals[i] = vals[j]; /* later bindings win */ | |
329 | n--; | |
b8d8f8b9 MW |
330 | fluids[j] = fluids[n]; |
331 | vals[j] = vals[n]; | |
bb0229b5 AW |
332 | break; |
333 | } | |
334 | } | |
335 | ||
336 | ret = scm_words (scm_tc7_with_fluids | (n << 8), 1 + n*2); | |
337 | SCM_SET_CELL_WORD_1 (ret, n); | |
338 | ||
339 | while (n--) | |
b3460a50 | 340 | { |
bb0229b5 AW |
341 | if (SCM_UNLIKELY (!IS_FLUID (fluids[n]))) |
342 | scm_wrong_type_arg ("with-fluids", 0, fluids[n]); | |
343 | SCM_SET_CELL_OBJECT (ret, 1 + n * 2, fluids[n]); | |
344 | SCM_SET_CELL_OBJECT (ret, 2 + n * 2, vals[n]); | |
b3460a50 | 345 | } |
bb0229b5 AW |
346 | |
347 | return ret; | |
b3460a50 | 348 | } |
bb0229b5 AW |
349 | |
350 | void | |
351 | scm_i_swap_with_fluids (SCM wf, SCM dynstate) | |
352 | { | |
353 | SCM fluids; | |
354 | size_t i, max = 0; | |
b3460a50 | 355 | |
bb0229b5 | 356 | fluids = DYNAMIC_STATE_FLUIDS (dynstate); |
b3460a50 | 357 | |
bb0229b5 AW |
358 | /* We could cache the max in the with-fluids, but that would take more mem, |
359 | and we're touching all the fluids anyway, so this per-swap traversal should | |
360 | be OK. */ | |
361 | for (i = 0; i < SCM_WITH_FLUIDS_LEN (wf); i++) | |
b3460a50 | 362 | { |
bb0229b5 AW |
363 | size_t num = FLUID_NUM (SCM_WITH_FLUIDS_NTH_FLUID (wf, i)); |
364 | max = (max > num) ? max : num; | |
b3460a50 | 365 | } |
b3460a50 | 366 | |
bb0229b5 AW |
367 | if (SCM_UNLIKELY (max >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) |
368 | { | |
bb0229b5 AW |
369 | /* Lazily grow the current thread's dynamic state. */ |
370 | grow_dynamic_state (dynstate); | |
371 | ||
372 | fluids = DYNAMIC_STATE_FLUIDS (dynstate); | |
373 | } | |
1bbd0b84 | 374 | |
bb0229b5 AW |
375 | /* Bind the fluids. Order doesn't matter, as all fluids are distinct. */ |
376 | for (i = 0; i < SCM_WITH_FLUIDS_LEN (wf); i++) | |
377 | { | |
378 | size_t fluid_num; | |
379 | SCM x; | |
380 | ||
381 | fluid_num = FLUID_NUM (SCM_WITH_FLUIDS_NTH_FLUID (wf, i)); | |
382 | x = SCM_SIMPLE_VECTOR_REF (fluids, fluid_num); | |
383 | SCM_SIMPLE_VECTOR_SET (fluids, fluid_num, | |
384 | SCM_WITH_FLUIDS_NTH_VAL (wf, i)); | |
385 | SCM_WITH_FLUIDS_SET_NTH_VAL (wf, i, x); | |
386 | } | |
387 | } | |
388 | ||
a1ec6916 | 389 | SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, |
ed4d7cee GB |
390 | (SCM fluids, SCM values, SCM thunk), |
391 | "Set @var{fluids} to @var{values} temporary, and call @var{thunk}.\n" | |
392 | "@var{fluids} must be a list of fluids and @var{values} must be the same\n" | |
393 | "number of their values to be applied. Each substitution is done\n" | |
394 | "one after another. @var{thunk} must be a procedure with no argument.") | |
1bbd0b84 GB |
395 | #define FUNC_NAME s_scm_with_fluids |
396 | { | |
bebd3fba MV |
397 | return scm_c_with_fluids (fluids, values, |
398 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
1bbd0b84 GB |
399 | } |
400 | #undef FUNC_NAME | |
b3460a50 MV |
401 | |
402 | SCM | |
143e0902 MV |
403 | scm_c_with_fluids (SCM fluids, SCM values, SCM (*cproc) (), void *cdata) |
404 | #define FUNC_NAME "scm_c_with_fluids" | |
b3460a50 | 405 | { |
bb0229b5 AW |
406 | SCM wf, ans; |
407 | long flen, vlen, i; | |
408 | SCM *fluidsv, *valuesv; | |
b3460a50 | 409 | |
c1bfcf60 | 410 | SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); |
ed4d7cee | 411 | SCM_VALIDATE_LIST_COPYLEN (2, values, vlen); |
b3460a50 | 412 | if (flen != vlen) |
ed4d7cee | 413 | scm_out_of_range (s_scm_with_fluids, values); |
b3460a50 | 414 | |
bb0229b5 AW |
415 | if (SCM_UNLIKELY (flen == 0)) |
416 | return cproc (cdata); | |
417 | ||
418 | fluidsv = alloca (sizeof(SCM)*flen); | |
419 | valuesv = alloca (sizeof(SCM)*flen); | |
bebd3fba | 420 | |
bb0229b5 AW |
421 | for (i = 0; i < flen; i++) |
422 | { | |
423 | fluidsv[i] = SCM_CAR (fluids); | |
424 | fluids = SCM_CDR (fluids); | |
425 | valuesv[i] = SCM_CAR (values); | |
426 | values = SCM_CDR (values); | |
427 | } | |
428 | ||
429 | wf = scm_i_make_with_fluids (flen, fluidsv, valuesv); | |
430 | scm_i_swap_with_fluids (wf, SCM_I_CURRENT_THREAD->dynamic_state); | |
431 | scm_i_set_dynwinds (scm_cons (wf, scm_i_dynwinds ())); | |
b3460a50 | 432 | ans = cproc (cdata); |
bb0229b5 AW |
433 | scm_i_swap_with_fluids (wf, SCM_I_CURRENT_THREAD->dynamic_state); |
434 | scm_i_set_dynwinds (scm_cdr (scm_i_dynwinds ())); | |
435 | ||
b3460a50 MV |
436 | return ans; |
437 | } | |
c1bfcf60 | 438 | #undef FUNC_NAME |
b3460a50 | 439 | |
bebd3fba MV |
440 | SCM_DEFINE (scm_with_fluid, "with-fluid*", 3, 0, 0, |
441 | (SCM fluid, SCM value, SCM thunk), | |
442 | "Set @var{fluid} to @var{value} temporarily, and call @var{thunk}.\n" | |
443 | "@var{thunk} must be a procedure with no argument.") | |
444 | #define FUNC_NAME s_scm_with_fluid | |
445 | { | |
446 | return scm_c_with_fluid (fluid, value, | |
447 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
448 | } | |
449 | #undef FUNC_NAME | |
450 | ||
143e0902 MV |
451 | SCM |
452 | scm_c_with_fluid (SCM fluid, SCM value, SCM (*cproc) (), void *cdata) | |
453 | #define FUNC_NAME "scm_c_with_fluid" | |
454 | { | |
bb0229b5 | 455 | SCM ans, wf; |
bebd3fba | 456 | |
bb0229b5 AW |
457 | wf = scm_i_make_with_fluids (1, &fluid, &value); |
458 | scm_i_swap_with_fluids (wf, SCM_I_CURRENT_THREAD->dynamic_state); | |
459 | scm_i_set_dynwinds (scm_cons (wf, scm_i_dynwinds ())); | |
bebd3fba | 460 | ans = cproc (cdata); |
bb0229b5 AW |
461 | scm_i_swap_with_fluids (wf, SCM_I_CURRENT_THREAD->dynamic_state); |
462 | scm_i_set_dynwinds (scm_cdr (scm_i_dynwinds ())); | |
463 | ||
bebd3fba | 464 | return ans; |
143e0902 MV |
465 | } |
466 | #undef FUNC_NAME | |
b3460a50 | 467 | |
ef20bf70 MV |
468 | static void |
469 | swap_fluid (SCM data) | |
470 | { | |
471 | SCM f = SCM_CAR (data); | |
ef94624e | 472 | SCM t = fluid_ref (f); |
ef20bf70 MV |
473 | scm_fluid_set_x (f, SCM_CDR (data)); |
474 | SCM_SETCDR (data, t); | |
475 | } | |
476 | ||
477 | void | |
661ae7ab | 478 | scm_dynwind_fluid (SCM fluid, SCM value) |
ef20bf70 MV |
479 | { |
480 | SCM data = scm_cons (fluid, value); | |
661ae7ab MV |
481 | scm_dynwind_rewind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); |
482 | scm_dynwind_unwind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); | |
ef20bf70 MV |
483 | } |
484 | ||
9de87eea MV |
485 | SCM |
486 | scm_i_make_initial_dynamic_state () | |
487 | { | |
488 | SCM fluids = scm_c_make_vector (allocated_fluids_len, SCM_BOOL_F); | |
9ea31741 | 489 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
490 | } |
491 | ||
492 | SCM_DEFINE (scm_make_dynamic_state, "make-dynamic-state", 0, 1, 0, | |
493 | (SCM parent), | |
494 | "Return a copy of the dynamic state object @var{parent}\n" | |
495 | "or of the current dynamic state when @var{parent} is omitted.") | |
496 | #define FUNC_NAME s_scm_make_dynamic_state | |
497 | { | |
9ea31741 | 498 | SCM fluids; |
9de87eea MV |
499 | |
500 | if (SCM_UNBNDP (parent)) | |
501 | parent = scm_current_dynamic_state (); | |
502 | ||
9ea31741 | 503 | SCM_ASSERT (IS_DYNAMIC_STATE (parent), parent, SCM_ARG1, FUNC_NAME); |
9de87eea | 504 | fluids = scm_vector_copy (DYNAMIC_STATE_FLUIDS (parent)); |
9ea31741 | 505 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
506 | } |
507 | #undef FUNC_NAME | |
508 | ||
509 | SCM_DEFINE (scm_dynamic_state_p, "dynamic-state?", 1, 0, 0, | |
510 | (SCM obj), | |
511 | "Return @code{#t} if @var{obj} is a dynamic state object;\n" | |
512 | "return @code{#f} otherwise") | |
513 | #define FUNC_NAME s_scm_dynamic_state_p | |
514 | { | |
515 | return scm_from_bool (IS_DYNAMIC_STATE (obj)); | |
516 | } | |
517 | #undef FUNC_NAME | |
518 | ||
519 | int | |
520 | scm_is_dynamic_state (SCM obj) | |
521 | { | |
522 | return IS_DYNAMIC_STATE (obj); | |
523 | } | |
524 | ||
525 | SCM_DEFINE (scm_current_dynamic_state, "current-dynamic-state", 0, 0, 0, | |
526 | (), | |
527 | "Return the current dynamic state object.") | |
528 | #define FUNC_NAME s_scm_current_dynamic_state | |
529 | { | |
530 | return SCM_I_CURRENT_THREAD->dynamic_state; | |
531 | } | |
532 | #undef FUNC_NAME | |
533 | ||
534 | SCM_DEFINE (scm_set_current_dynamic_state, "set-current-dynamic-state", 1,0,0, | |
535 | (SCM state), | |
536 | "Set the current dynamic state object to @var{state}\n" | |
537 | "and return the previous current dynamic state object.") | |
538 | #define FUNC_NAME s_scm_set_current_dynamic_state | |
539 | { | |
540 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
541 | SCM old = t->dynamic_state; | |
9ea31741 | 542 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, FUNC_NAME); |
9de87eea MV |
543 | t->dynamic_state = state; |
544 | return old; | |
545 | } | |
546 | #undef FUNC_NAME | |
547 | ||
548 | static void | |
549 | swap_dynamic_state (SCM loc) | |
550 | { | |
551 | SCM_SETCAR (loc, scm_set_current_dynamic_state (SCM_CAR (loc))); | |
552 | } | |
553 | ||
554 | void | |
661ae7ab | 555 | scm_dynwind_current_dynamic_state (SCM state) |
9de87eea MV |
556 | { |
557 | SCM loc = scm_cons (state, SCM_EOL); | |
9ea31741 | 558 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, NULL); |
661ae7ab | 559 | scm_dynwind_rewind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea | 560 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 561 | scm_dynwind_unwind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea MV |
562 | SCM_F_WIND_EXPLICITLY); |
563 | } | |
564 | ||
565 | void * | |
566 | scm_c_with_dynamic_state (SCM state, void *(*func)(void *), void *data) | |
567 | { | |
568 | void *result; | |
661ae7ab MV |
569 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
570 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 571 | result = func (data); |
661ae7ab | 572 | scm_dynwind_end (); |
9de87eea MV |
573 | return result; |
574 | } | |
575 | ||
576 | SCM_DEFINE (scm_with_dynamic_state, "with-dynamic-state", 2, 0, 0, | |
577 | (SCM state, SCM proc), | |
578 | "Call @var{proc} while @var{state} is the current dynamic\n" | |
579 | "state object.") | |
580 | #define FUNC_NAME s_scm_with_dynamic_state | |
581 | { | |
582 | SCM result; | |
661ae7ab MV |
583 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
584 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 585 | result = scm_call_0 (proc); |
661ae7ab | 586 | scm_dynwind_end (); |
9de87eea MV |
587 | return result; |
588 | } | |
589 | #undef FUNC_NAME | |
590 | ||
9de87eea | 591 | |
9482a297 MV |
592 | void |
593 | scm_init_fluids () | |
594 | { | |
a0599745 | 595 | #include "libguile/fluids.x" |
9482a297 | 596 | } |
89e00824 ML |
597 | |
598 | /* | |
599 | Local Variables: | |
600 | c-file-style: "gnu" | |
601 | End: | |
602 | */ |