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f43622a2 | 1 | /* Copyright (C) 1996,1997,2000,2001, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
9482a297 | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
9482a297 | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
9482a297 | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
9482a297 | 18 | |
dbb605f5 LC |
19 | #ifdef HAVE_CONFIG_H |
20 | # include <config.h> | |
21 | #endif | |
22 | ||
9de87eea MV |
23 | #include <stdio.h> |
24 | #include <string.h> | |
1bbd0b84 | 25 | |
a0599745 MD |
26 | #include "libguile/_scm.h" |
27 | #include "libguile/print.h" | |
a0599745 MD |
28 | #include "libguile/dynwind.h" |
29 | #include "libguile/fluids.h" | |
30 | #include "libguile/alist.h" | |
31 | #include "libguile/eval.h" | |
32 | #include "libguile/ports.h" | |
143e0902 | 33 | #include "libguile/deprecation.h" |
a0599745 | 34 | #include "libguile/validate.h" |
bd5a75dc | 35 | #include "libguile/bdw-gc.h" |
9482a297 | 36 | |
bd5a75dc LC |
37 | /* Number of additional slots to allocate when ALLOCATED_FLUIDS is full. */ |
38 | #define FLUID_GROW 128 | |
9de87eea | 39 | |
bd5a75dc LC |
40 | /* Vector of allocated fluids indexed by fluid numbers. Access is protected by |
41 | FLUID_ADMIN_MUTEX. */ | |
42 | static void **allocated_fluids = NULL; | |
43 | static size_t allocated_fluids_len = 0; | |
9482a297 | 44 | |
9de87eea MV |
45 | static scm_i_pthread_mutex_t fluid_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
46 | ||
6f8d7b12 | 47 | #define IS_FLUID(x) SCM_FLUID_P (x) |
5ef71027 | 48 | #define FLUID_NUM(x) SCM_I_FLUID_NUM (x) |
9de87eea | 49 | |
5ef71027 AW |
50 | #define IS_DYNAMIC_STATE(x) SCM_I_DYNAMIC_STATE_P (x) |
51 | #define DYNAMIC_STATE_FLUIDS(x) SCM_I_DYNAMIC_STATE_FLUIDS (x) | |
9ea31741 | 52 | #define SET_DYNAMIC_STATE_FLUIDS(x, y) SCM_SET_CELL_WORD_1 ((x), (SCM_UNPACK (y))) |
9de87eea | 53 | |
9de87eea | 54 | |
8b039053 | 55 | \f |
bd5a75dc LC |
56 | /* Grow STATE so that it can hold up to ALLOCATED_FLUIDS_LEN fluids. This may |
57 | be more than necessary since ALLOCATED_FLUIDS is sparse and the current | |
58 | thread may not access all the fluids anyway. Memory usage could be improved | |
59 | by using a 2-level array as is done in glibc for pthread keys (TODO). */ | |
9482a297 | 60 | static void |
8b039053 | 61 | grow_dynamic_state (SCM state) |
9de87eea | 62 | { |
8b039053 LC |
63 | SCM new_fluids; |
64 | SCM old_fluids = DYNAMIC_STATE_FLUIDS (state); | |
bd5a75dc | 65 | size_t i, len, old_len = SCM_SIMPLE_VECTOR_LENGTH (old_fluids); |
9de87eea | 66 | |
bd5a75dc LC |
67 | /* Assume the assignment below is atomic. */ |
68 | len = allocated_fluids_len; | |
9de87eea | 69 | |
aafb4ed7 | 70 | new_fluids = scm_c_make_vector (len, SCM_UNDEFINED); |
8b039053 LC |
71 | |
72 | for (i = 0; i < old_len; i++) | |
73 | SCM_SIMPLE_VECTOR_SET (new_fluids, i, | |
74 | SCM_SIMPLE_VECTOR_REF (old_fluids, i)); | |
75 | SET_DYNAMIC_STATE_FLUIDS (state, new_fluids); | |
9482a297 MV |
76 | } |
77 | ||
9ea31741 AW |
78 | void |
79 | scm_i_fluid_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
9482a297 | 80 | { |
0607ebbf | 81 | scm_puts_unlocked ("#<fluid ", port); |
9de87eea | 82 | scm_intprint ((int) FLUID_NUM (exp), 10, port); |
0607ebbf | 83 | scm_putc_unlocked ('>', port); |
9482a297 MV |
84 | } |
85 | ||
45cf2428 AW |
86 | void |
87 | scm_i_dynamic_state_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
88 | { | |
0607ebbf | 89 | scm_puts_unlocked ("#<dynamic-state ", port); |
45cf2428 | 90 | scm_intprint (SCM_UNPACK (exp), 16, port); |
0607ebbf | 91 | scm_putc_unlocked ('>', port); |
45cf2428 AW |
92 | } |
93 | ||
bd5a75dc LC |
94 | \f |
95 | /* Return a new fluid. */ | |
96 | static SCM | |
aafb4ed7 | 97 | new_fluid (SCM init) |
9482a297 | 98 | { |
bd5a75dc LC |
99 | SCM fluid; |
100 | size_t trial, n; | |
101 | ||
aafb4ed7 AW |
102 | /* Fluids hold the type tag and the fluid number in the first word, |
103 | and the default value in the second word. */ | |
104 | fluid = scm_cell (scm_tc7_fluid, SCM_UNPACK (init)); | |
bd5a75dc | 105 | SCM_SET_CELL_TYPE (fluid, scm_tc7_fluid); |
9de87eea | 106 | |
661ae7ab MV |
107 | scm_dynwind_begin (0); |
108 | scm_i_dynwind_pthread_mutex_lock (&fluid_admin_mutex); | |
9de87eea | 109 | |
bd5a75dc | 110 | for (trial = 0; trial < 2; trial++) |
9de87eea | 111 | { |
bd5a75dc | 112 | /* Look for a free fluid number. */ |
9de87eea | 113 | for (n = 0; n < allocated_fluids_len; n++) |
bd5a75dc LC |
114 | /* TODO: Use `__sync_bool_compare_and_swap' where available. */ |
115 | if (allocated_fluids[n] == NULL) | |
9de87eea | 116 | break; |
bd5a75dc LC |
117 | |
118 | if (trial == 0 && n >= allocated_fluids_len) | |
119 | /* All fluid numbers are in use. Run a GC and retry. Explicitly | |
120 | running the GC is costly and bad-style. We only do this because | |
121 | dynamic state fluid vectors would grow unreasonably if fluid numbers | |
122 | weren't reused. */ | |
123 | scm_i_gc ("fluids"); | |
9de87eea | 124 | } |
bd5a75dc LC |
125 | |
126 | if (n >= allocated_fluids_len) | |
9de87eea | 127 | { |
8b039053 | 128 | /* Grow the vector of allocated fluids. */ |
bd5a75dc LC |
129 | void **new_allocated_fluids = |
130 | scm_gc_malloc_pointerless ((allocated_fluids_len + FLUID_GROW) | |
131 | * sizeof (*allocated_fluids), | |
132 | "allocated fluids"); | |
9de87eea MV |
133 | |
134 | /* Copy over old values and initialize rest. GC can not run | |
135 | during these two operations since there is no safe point in | |
bd5a75dc LC |
136 | them. */ |
137 | memcpy (new_allocated_fluids, allocated_fluids, | |
138 | allocated_fluids_len * sizeof (*allocated_fluids)); | |
139 | memset (new_allocated_fluids + allocated_fluids_len, 0, | |
140 | FLUID_GROW * sizeof (*allocated_fluids)); | |
9de87eea | 141 | n = allocated_fluids_len; |
d3075c52 | 142 | |
8b039053 LC |
143 | /* Update the vector of allocated fluids. Dynamic states will |
144 | eventually be lazily grown to accomodate the new value of | |
145 | ALLOCATED_FLUIDS_LEN in `fluid-ref' and `fluid-set!'. */ | |
9de87eea MV |
146 | allocated_fluids = new_allocated_fluids; |
147 | allocated_fluids_len += FLUID_GROW; | |
9de87eea | 148 | } |
bd5a75dc | 149 | |
21041372 | 150 | allocated_fluids[n] = SCM_UNPACK_POINTER (fluid); |
aafb4ed7 | 151 | SCM_SET_CELL_WORD_0 (fluid, (scm_tc7_fluid | (n << 8))); |
bd5a75dc LC |
152 | |
153 | GC_GENERAL_REGISTER_DISAPPEARING_LINK (&allocated_fluids[n], | |
0aed71aa | 154 | SCM2PTR (fluid)); |
bd5a75dc | 155 | |
661ae7ab | 156 | scm_dynwind_end (); |
0b77014f AW |
157 | |
158 | /* Now null out values. We could (and probably should) do this when | |
159 | the fluid is collected instead of now. */ | |
aafb4ed7 | 160 | scm_i_reset_fluid (n); |
0b77014f | 161 | |
bd5a75dc | 162 | return fluid; |
9482a297 MV |
163 | } |
164 | ||
aafb4ed7 AW |
165 | SCM |
166 | scm_make_fluid (void) | |
167 | { | |
168 | return new_fluid (SCM_BOOL_F); | |
169 | } | |
170 | ||
171 | SCM_DEFINE (scm_make_fluid_with_default, "make-fluid", 0, 1, 0, | |
172 | (SCM dflt), | |
f43622a2 AW |
173 | "Return a newly created fluid, whose initial value is @var{dflt},\n" |
174 | "or @code{#f} if @var{dflt} is not given.\n" | |
9de87eea MV |
175 | "Fluids are objects that can hold one\n" |
176 | "value per dynamic state. That is, modifications to this value are\n" | |
177 | "only visible to code that executes with the same dynamic state as\n" | |
178 | "the modifying code. When a new dynamic state is constructed, it\n" | |
179 | "inherits the values from its parent. Because each thread normally executes\n" | |
180 | "with its own dynamic state, you can use fluids for thread local storage.") | |
aafb4ed7 | 181 | #define FUNC_NAME s_scm_make_fluid_with_default |
9482a297 | 182 | { |
aafb4ed7 | 183 | return new_fluid (SCM_UNBNDP (dflt) ? SCM_BOOL_F : dflt); |
9482a297 | 184 | } |
1bbd0b84 | 185 | #undef FUNC_NAME |
9482a297 | 186 | |
e01163b5 | 187 | SCM_DEFINE (scm_make_unbound_fluid, "make-unbound-fluid", 0, 0, 0, |
ef94624e | 188 | (), |
e01163b5 AW |
189 | "Make a fluid that is initially unbound.") |
190 | #define FUNC_NAME s_scm_make_unbound_fluid | |
ef94624e | 191 | { |
aafb4ed7 | 192 | return new_fluid (SCM_UNDEFINED); |
ef94624e BT |
193 | } |
194 | #undef FUNC_NAME | |
195 | ||
a1ec6916 | 196 | SCM_DEFINE (scm_fluid_p, "fluid?", 1, 0, 0, |
ed4d7cee | 197 | (SCM obj), |
1e6808ea MG |
198 | "Return @code{#t} iff @var{obj} is a fluid; otherwise, return\n" |
199 | "@code{#f}.") | |
1bbd0b84 | 200 | #define FUNC_NAME s_scm_fluid_p |
b3460a50 | 201 | { |
9de87eea | 202 | return scm_from_bool (IS_FLUID (obj)); |
b3460a50 | 203 | } |
1bbd0b84 | 204 | #undef FUNC_NAME |
b3460a50 | 205 | |
9de87eea MV |
206 | int |
207 | scm_is_fluid (SCM obj) | |
208 | { | |
209 | return IS_FLUID (obj); | |
210 | } | |
211 | ||
ef94624e BT |
212 | /* Does not check type of `fluid'! */ |
213 | static SCM | |
214 | fluid_ref (SCM fluid) | |
9482a297 | 215 | { |
aafb4ed7 | 216 | SCM ret; |
9de87eea | 217 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 218 | |
8b039053 LC |
219 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) |
220 | { | |
8b039053 LC |
221 | /* Lazily grow the current thread's dynamic state. */ |
222 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
223 | ||
224 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
225 | } | |
226 | ||
aafb4ed7 AW |
227 | ret = SCM_SIMPLE_VECTOR_REF (fluids, FLUID_NUM (fluid)); |
228 | if (SCM_UNBNDP (ret)) | |
229 | return SCM_I_FLUID_DEFAULT (fluid); | |
230 | else | |
231 | return ret; | |
9482a297 | 232 | } |
ef94624e BT |
233 | |
234 | SCM_DEFINE (scm_fluid_ref, "fluid-ref", 1, 0, 0, | |
235 | (SCM fluid), | |
236 | "Return the value associated with @var{fluid} in the current\n" | |
237 | "dynamic root. If @var{fluid} has not been set, then return\n" | |
238 | "@code{#f}.") | |
239 | #define FUNC_NAME s_scm_fluid_ref | |
240 | { | |
241 | SCM val; | |
242 | SCM_VALIDATE_FLUID (1, fluid); | |
243 | val = fluid_ref (fluid); | |
244 | if (SCM_UNBNDP (val)) | |
245 | SCM_MISC_ERROR ("unbound fluid: ~S", | |
246 | scm_list_1 (fluid)); | |
247 | return val; | |
248 | } | |
1bbd0b84 | 249 | #undef FUNC_NAME |
9482a297 | 250 | |
a1ec6916 | 251 | SCM_DEFINE (scm_fluid_set_x, "fluid-set!", 2, 0, 0, |
ed4d7cee GB |
252 | (SCM fluid, SCM value), |
253 | "Set the value associated with @var{fluid} in the current dynamic root.") | |
1bbd0b84 | 254 | #define FUNC_NAME s_scm_fluid_set_x |
9482a297 | 255 | { |
9de87eea | 256 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 257 | |
ed4d7cee | 258 | SCM_VALIDATE_FLUID (1, fluid); |
8b039053 LC |
259 | |
260 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) | |
261 | { | |
8b039053 LC |
262 | /* Lazily grow the current thread's dynamic state. */ |
263 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
264 | ||
265 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
266 | } | |
267 | ||
9de87eea | 268 | SCM_SIMPLE_VECTOR_SET (fluids, FLUID_NUM (fluid), value); |
86f9f9ae | 269 | return SCM_UNSPECIFIED; |
9482a297 | 270 | } |
1bbd0b84 | 271 | #undef FUNC_NAME |
9482a297 | 272 | |
ef94624e BT |
273 | SCM_DEFINE (scm_fluid_unset_x, "fluid-unset!", 1, 0, 0, |
274 | (SCM fluid), | |
275 | "Unset the value associated with @var{fluid}.") | |
276 | #define FUNC_NAME s_scm_fluid_unset_x | |
277 | { | |
aafb4ed7 AW |
278 | /* FIXME: really unset the default value, too? The current test |
279 | suite demands it, but I would prefer not to. */ | |
280 | SCM_SET_CELL_OBJECT_1 (fluid, SCM_UNDEFINED); | |
ef94624e BT |
281 | return scm_fluid_set_x (fluid, SCM_UNDEFINED); |
282 | } | |
283 | #undef FUNC_NAME | |
284 | ||
285 | SCM_DEFINE (scm_fluid_bound_p, "fluid-bound?", 1, 0, 0, | |
286 | (SCM fluid), | |
287 | "Return @code{#t} iff @var{fluid} is bound to a value.\n" | |
288 | "Throw an error if @var{fluid} is not a fluid.") | |
289 | #define FUNC_NAME s_scm_fluid_bound_p | |
290 | { | |
291 | SCM val; | |
292 | SCM_VALIDATE_FLUID (1, fluid); | |
293 | val = fluid_ref (fluid); | |
294 | return scm_from_bool (! (SCM_UNBNDP (val))); | |
295 | } | |
296 | #undef FUNC_NAME | |
297 | ||
bb0229b5 AW |
298 | static SCM |
299 | apply_thunk (void *thunk) | |
b3460a50 | 300 | { |
bb0229b5 AW |
301 | return scm_call_0 (SCM_PACK (thunk)); |
302 | } | |
303 | ||
9ede013f AW |
304 | size_t |
305 | scm_prepare_fluids (size_t n, SCM *fluids, SCM *values) | |
bb0229b5 | 306 | { |
9ede013f | 307 | size_t j = n; |
bb0229b5 AW |
308 | |
309 | /* Ensure that there are no duplicates in the fluids set -- an N^2 operation, | |
310 | but N will usually be small, so perhaps that's OK. */ | |
9ede013f AW |
311 | while (j--) |
312 | { | |
313 | size_t i; | |
314 | ||
315 | if (SCM_UNLIKELY (!IS_FLUID (fluids[j]))) | |
316 | scm_wrong_type_arg ("with-fluids", 0, fluids[j]); | |
bb0229b5 | 317 | |
bb0229b5 | 318 | for (i = 0; i < j; i++) |
d223c3fc | 319 | if (scm_is_eq (fluids[i], fluids[j])) |
bb0229b5 | 320 | { |
9ede013f | 321 | values[i] = values[j]; /* later bindings win */ |
bb0229b5 AW |
322 | n--; |
323 | break; | |
324 | } | |
b3460a50 | 325 | } |
bb0229b5 | 326 | |
9ede013f | 327 | return n; |
b3460a50 | 328 | } |
bb0229b5 AW |
329 | |
330 | void | |
9ede013f | 331 | scm_swap_fluids (size_t n, SCM *fluids, SCM *values, SCM dynstate) |
bb0229b5 | 332 | { |
9ede013f | 333 | SCM fluid_vector; |
bb0229b5 | 334 | size_t i, max = 0; |
b3460a50 | 335 | |
9ede013f | 336 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
b3460a50 | 337 | |
bb0229b5 AW |
338 | /* We could cache the max in the with-fluids, but that would take more mem, |
339 | and we're touching all the fluids anyway, so this per-swap traversal should | |
340 | be OK. */ | |
9ede013f | 341 | for (i = 0; i < n; i++) |
b3460a50 | 342 | { |
9ede013f | 343 | size_t num = FLUID_NUM (fluids[i]); |
bb0229b5 | 344 | max = (max > num) ? max : num; |
b3460a50 | 345 | } |
b3460a50 | 346 | |
9ede013f | 347 | if (SCM_UNLIKELY (max >= SCM_SIMPLE_VECTOR_LENGTH (fluid_vector))) |
bb0229b5 | 348 | { |
bb0229b5 AW |
349 | /* Lazily grow the current thread's dynamic state. */ |
350 | grow_dynamic_state (dynstate); | |
351 | ||
9ede013f | 352 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
bb0229b5 | 353 | } |
1bbd0b84 | 354 | |
bb0229b5 | 355 | /* Bind the fluids. Order doesn't matter, as all fluids are distinct. */ |
9ede013f | 356 | for (i = 0; i < n; i++) |
bb0229b5 AW |
357 | { |
358 | size_t fluid_num; | |
359 | SCM x; | |
360 | ||
9ede013f AW |
361 | fluid_num = FLUID_NUM (fluids[i]); |
362 | x = SCM_SIMPLE_VECTOR_REF (fluid_vector, fluid_num); | |
363 | SCM_SIMPLE_VECTOR_SET (fluid_vector, fluid_num, values[i]); | |
364 | values[i] = x; | |
bb0229b5 AW |
365 | } |
366 | } | |
367 | ||
a1ec6916 | 368 | SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, |
ed4d7cee GB |
369 | (SCM fluids, SCM values, SCM thunk), |
370 | "Set @var{fluids} to @var{values} temporary, and call @var{thunk}.\n" | |
371 | "@var{fluids} must be a list of fluids and @var{values} must be the same\n" | |
372 | "number of their values to be applied. Each substitution is done\n" | |
373 | "one after another. @var{thunk} must be a procedure with no argument.") | |
1bbd0b84 GB |
374 | #define FUNC_NAME s_scm_with_fluids |
375 | { | |
bebd3fba MV |
376 | return scm_c_with_fluids (fluids, values, |
377 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
1bbd0b84 GB |
378 | } |
379 | #undef FUNC_NAME | |
b3460a50 MV |
380 | |
381 | SCM | |
143e0902 MV |
382 | scm_c_with_fluids (SCM fluids, SCM values, SCM (*cproc) (), void *cdata) |
383 | #define FUNC_NAME "scm_c_with_fluids" | |
b3460a50 | 384 | { |
9ede013f | 385 | SCM ans; |
bb0229b5 AW |
386 | long flen, vlen, i; |
387 | SCM *fluidsv, *valuesv; | |
9ede013f | 388 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
b3460a50 | 389 | |
c1bfcf60 | 390 | SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); |
ed4d7cee | 391 | SCM_VALIDATE_LIST_COPYLEN (2, values, vlen); |
b3460a50 | 392 | if (flen != vlen) |
ed4d7cee | 393 | scm_out_of_range (s_scm_with_fluids, values); |
b3460a50 | 394 | |
bb0229b5 AW |
395 | if (SCM_UNLIKELY (flen == 0)) |
396 | return cproc (cdata); | |
397 | ||
398 | fluidsv = alloca (sizeof(SCM)*flen); | |
399 | valuesv = alloca (sizeof(SCM)*flen); | |
bebd3fba | 400 | |
bb0229b5 AW |
401 | for (i = 0; i < flen; i++) |
402 | { | |
403 | fluidsv[i] = SCM_CAR (fluids); | |
404 | fluids = SCM_CDR (fluids); | |
405 | valuesv[i] = SCM_CAR (values); | |
406 | values = SCM_CDR (values); | |
407 | } | |
408 | ||
9ede013f AW |
409 | scm_dynstack_push_fluids (&thread->dynstack, flen, fluidsv, valuesv, |
410 | thread->dynamic_state); | |
b3460a50 | 411 | ans = cproc (cdata); |
9ede013f | 412 | scm_dynstack_unwind_fluids (&thread->dynstack, thread->dynamic_state); |
bb0229b5 | 413 | |
b3460a50 MV |
414 | return ans; |
415 | } | |
c1bfcf60 | 416 | #undef FUNC_NAME |
b3460a50 | 417 | |
bebd3fba MV |
418 | SCM_DEFINE (scm_with_fluid, "with-fluid*", 3, 0, 0, |
419 | (SCM fluid, SCM value, SCM thunk), | |
420 | "Set @var{fluid} to @var{value} temporarily, and call @var{thunk}.\n" | |
421 | "@var{thunk} must be a procedure with no argument.") | |
422 | #define FUNC_NAME s_scm_with_fluid | |
423 | { | |
424 | return scm_c_with_fluid (fluid, value, | |
425 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
426 | } | |
427 | #undef FUNC_NAME | |
428 | ||
143e0902 MV |
429 | SCM |
430 | scm_c_with_fluid (SCM fluid, SCM value, SCM (*cproc) (), void *cdata) | |
431 | #define FUNC_NAME "scm_c_with_fluid" | |
432 | { | |
9ede013f AW |
433 | SCM ans; |
434 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; | |
bebd3fba | 435 | |
9ede013f AW |
436 | scm_dynstack_push_fluids (&thread->dynstack, 1, &fluid, &value, |
437 | thread->dynamic_state); | |
bebd3fba | 438 | ans = cproc (cdata); |
9ede013f | 439 | scm_dynstack_unwind_fluids (&thread->dynstack, thread->dynamic_state); |
bb0229b5 | 440 | |
bebd3fba | 441 | return ans; |
143e0902 MV |
442 | } |
443 | #undef FUNC_NAME | |
b3460a50 | 444 | |
ef20bf70 MV |
445 | static void |
446 | swap_fluid (SCM data) | |
447 | { | |
448 | SCM f = SCM_CAR (data); | |
ef94624e | 449 | SCM t = fluid_ref (f); |
ef20bf70 MV |
450 | scm_fluid_set_x (f, SCM_CDR (data)); |
451 | SCM_SETCDR (data, t); | |
452 | } | |
453 | ||
454 | void | |
661ae7ab | 455 | scm_dynwind_fluid (SCM fluid, SCM value) |
ef20bf70 MV |
456 | { |
457 | SCM data = scm_cons (fluid, value); | |
661ae7ab MV |
458 | scm_dynwind_rewind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); |
459 | scm_dynwind_unwind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); | |
ef20bf70 MV |
460 | } |
461 | ||
9de87eea MV |
462 | SCM |
463 | scm_i_make_initial_dynamic_state () | |
464 | { | |
465 | SCM fluids = scm_c_make_vector (allocated_fluids_len, SCM_BOOL_F); | |
9ea31741 | 466 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
467 | } |
468 | ||
469 | SCM_DEFINE (scm_make_dynamic_state, "make-dynamic-state", 0, 1, 0, | |
470 | (SCM parent), | |
471 | "Return a copy of the dynamic state object @var{parent}\n" | |
472 | "or of the current dynamic state when @var{parent} is omitted.") | |
473 | #define FUNC_NAME s_scm_make_dynamic_state | |
474 | { | |
9ea31741 | 475 | SCM fluids; |
9de87eea MV |
476 | |
477 | if (SCM_UNBNDP (parent)) | |
478 | parent = scm_current_dynamic_state (); | |
479 | ||
9ea31741 | 480 | SCM_ASSERT (IS_DYNAMIC_STATE (parent), parent, SCM_ARG1, FUNC_NAME); |
9de87eea | 481 | fluids = scm_vector_copy (DYNAMIC_STATE_FLUIDS (parent)); |
9ea31741 | 482 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
483 | } |
484 | #undef FUNC_NAME | |
485 | ||
486 | SCM_DEFINE (scm_dynamic_state_p, "dynamic-state?", 1, 0, 0, | |
487 | (SCM obj), | |
488 | "Return @code{#t} if @var{obj} is a dynamic state object;\n" | |
489 | "return @code{#f} otherwise") | |
490 | #define FUNC_NAME s_scm_dynamic_state_p | |
491 | { | |
492 | return scm_from_bool (IS_DYNAMIC_STATE (obj)); | |
493 | } | |
494 | #undef FUNC_NAME | |
495 | ||
496 | int | |
497 | scm_is_dynamic_state (SCM obj) | |
498 | { | |
499 | return IS_DYNAMIC_STATE (obj); | |
500 | } | |
501 | ||
502 | SCM_DEFINE (scm_current_dynamic_state, "current-dynamic-state", 0, 0, 0, | |
503 | (), | |
504 | "Return the current dynamic state object.") | |
505 | #define FUNC_NAME s_scm_current_dynamic_state | |
506 | { | |
507 | return SCM_I_CURRENT_THREAD->dynamic_state; | |
508 | } | |
509 | #undef FUNC_NAME | |
510 | ||
511 | SCM_DEFINE (scm_set_current_dynamic_state, "set-current-dynamic-state", 1,0,0, | |
512 | (SCM state), | |
513 | "Set the current dynamic state object to @var{state}\n" | |
514 | "and return the previous current dynamic state object.") | |
515 | #define FUNC_NAME s_scm_set_current_dynamic_state | |
516 | { | |
517 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
518 | SCM old = t->dynamic_state; | |
9ea31741 | 519 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, FUNC_NAME); |
9de87eea MV |
520 | t->dynamic_state = state; |
521 | return old; | |
522 | } | |
523 | #undef FUNC_NAME | |
524 | ||
525 | static void | |
526 | swap_dynamic_state (SCM loc) | |
527 | { | |
528 | SCM_SETCAR (loc, scm_set_current_dynamic_state (SCM_CAR (loc))); | |
529 | } | |
530 | ||
531 | void | |
661ae7ab | 532 | scm_dynwind_current_dynamic_state (SCM state) |
9de87eea MV |
533 | { |
534 | SCM loc = scm_cons (state, SCM_EOL); | |
9ea31741 | 535 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, NULL); |
661ae7ab | 536 | scm_dynwind_rewind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea | 537 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 538 | scm_dynwind_unwind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea MV |
539 | SCM_F_WIND_EXPLICITLY); |
540 | } | |
541 | ||
542 | void * | |
543 | scm_c_with_dynamic_state (SCM state, void *(*func)(void *), void *data) | |
544 | { | |
545 | void *result; | |
661ae7ab MV |
546 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
547 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 548 | result = func (data); |
661ae7ab | 549 | scm_dynwind_end (); |
9de87eea MV |
550 | return result; |
551 | } | |
552 | ||
553 | SCM_DEFINE (scm_with_dynamic_state, "with-dynamic-state", 2, 0, 0, | |
554 | (SCM state, SCM proc), | |
555 | "Call @var{proc} while @var{state} is the current dynamic\n" | |
556 | "state object.") | |
557 | #define FUNC_NAME s_scm_with_dynamic_state | |
558 | { | |
559 | SCM result; | |
661ae7ab MV |
560 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
561 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 562 | result = scm_call_0 (proc); |
661ae7ab | 563 | scm_dynwind_end (); |
9de87eea MV |
564 | return result; |
565 | } | |
566 | #undef FUNC_NAME | |
567 | ||
9de87eea | 568 | |
9482a297 MV |
569 | void |
570 | scm_init_fluids () | |
571 | { | |
a0599745 | 572 | #include "libguile/fluids.x" |
9482a297 | 573 | } |
89e00824 ML |
574 | |
575 | /* | |
576 | Local Variables: | |
577 | c-file-style: "gnu" | |
578 | End: | |
579 | */ |