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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 | ||
9de87eea MV |
24 | #include <stdio.h> |
25 | #include <string.h> | |
1bbd0b84 | 26 | |
a0599745 MD |
27 | #include "libguile/_scm.h" |
28 | #include "libguile/print.h" | |
a0599745 MD |
29 | #include "libguile/dynwind.h" |
30 | #include "libguile/fluids.h" | |
31 | #include "libguile/alist.h" | |
32 | #include "libguile/eval.h" | |
33 | #include "libguile/ports.h" | |
143e0902 | 34 | #include "libguile/deprecation.h" |
a0599745 | 35 | #include "libguile/validate.h" |
bd5a75dc | 36 | #include "libguile/bdw-gc.h" |
9482a297 | 37 | |
bd5a75dc LC |
38 | /* Number of additional slots to allocate when ALLOCATED_FLUIDS is full. */ |
39 | #define FLUID_GROW 128 | |
9de87eea | 40 | |
bd5a75dc LC |
41 | /* Vector of allocated fluids indexed by fluid numbers. Access is protected by |
42 | FLUID_ADMIN_MUTEX. */ | |
43 | static void **allocated_fluids = NULL; | |
44 | static size_t allocated_fluids_len = 0; | |
9482a297 | 45 | |
9de87eea MV |
46 | static scm_i_pthread_mutex_t fluid_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
47 | ||
6f8d7b12 | 48 | #define IS_FLUID(x) SCM_FLUID_P (x) |
5ef71027 | 49 | #define FLUID_NUM(x) SCM_I_FLUID_NUM (x) |
9de87eea | 50 | |
5ef71027 AW |
51 | #define IS_DYNAMIC_STATE(x) SCM_I_DYNAMIC_STATE_P (x) |
52 | #define DYNAMIC_STATE_FLUIDS(x) SCM_I_DYNAMIC_STATE_FLUIDS (x) | |
9ea31741 | 53 | #define SET_DYNAMIC_STATE_FLUIDS(x, y) SCM_SET_CELL_WORD_1 ((x), (SCM_UNPACK (y))) |
9de87eea | 54 | |
9de87eea | 55 | |
8b039053 | 56 | \f |
bd5a75dc LC |
57 | /* Grow STATE so that it can hold up to ALLOCATED_FLUIDS_LEN fluids. This may |
58 | be more than necessary since ALLOCATED_FLUIDS is sparse and the current | |
59 | thread may not access all the fluids anyway. Memory usage could be improved | |
60 | by using a 2-level array as is done in glibc for pthread keys (TODO). */ | |
9482a297 | 61 | static void |
8b039053 | 62 | grow_dynamic_state (SCM state) |
9de87eea | 63 | { |
8b039053 LC |
64 | SCM new_fluids; |
65 | SCM old_fluids = DYNAMIC_STATE_FLUIDS (state); | |
bd5a75dc | 66 | size_t i, len, old_len = SCM_SIMPLE_VECTOR_LENGTH (old_fluids); |
9de87eea | 67 | |
bd5a75dc LC |
68 | /* Assume the assignment below is atomic. */ |
69 | len = allocated_fluids_len; | |
9de87eea | 70 | |
aafb4ed7 | 71 | new_fluids = scm_c_make_vector (len, SCM_UNDEFINED); |
8b039053 LC |
72 | |
73 | for (i = 0; i < old_len; i++) | |
74 | SCM_SIMPLE_VECTOR_SET (new_fluids, i, | |
75 | SCM_SIMPLE_VECTOR_REF (old_fluids, i)); | |
76 | SET_DYNAMIC_STATE_FLUIDS (state, new_fluids); | |
9482a297 MV |
77 | } |
78 | ||
9ea31741 AW |
79 | void |
80 | scm_i_fluid_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
9482a297 | 81 | { |
0607ebbf | 82 | scm_puts_unlocked ("#<fluid ", port); |
9de87eea | 83 | scm_intprint ((int) FLUID_NUM (exp), 10, port); |
0607ebbf | 84 | scm_putc_unlocked ('>', port); |
9482a297 MV |
85 | } |
86 | ||
45cf2428 AW |
87 | void |
88 | scm_i_dynamic_state_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) | |
89 | { | |
0607ebbf | 90 | scm_puts_unlocked ("#<dynamic-state ", port); |
45cf2428 | 91 | scm_intprint (SCM_UNPACK (exp), 16, port); |
0607ebbf | 92 | scm_putc_unlocked ('>', port); |
45cf2428 AW |
93 | } |
94 | ||
bd5a75dc LC |
95 | \f |
96 | /* Return a new fluid. */ | |
97 | static SCM | |
aafb4ed7 | 98 | new_fluid (SCM init) |
9482a297 | 99 | { |
bd5a75dc LC |
100 | SCM fluid; |
101 | size_t trial, n; | |
102 | ||
aafb4ed7 AW |
103 | /* Fluids hold the type tag and the fluid number in the first word, |
104 | and the default value in the second word. */ | |
105 | fluid = scm_cell (scm_tc7_fluid, SCM_UNPACK (init)); | |
bd5a75dc | 106 | SCM_SET_CELL_TYPE (fluid, scm_tc7_fluid); |
9de87eea | 107 | |
661ae7ab MV |
108 | scm_dynwind_begin (0); |
109 | scm_i_dynwind_pthread_mutex_lock (&fluid_admin_mutex); | |
9de87eea | 110 | |
bd5a75dc | 111 | for (trial = 0; trial < 2; trial++) |
9de87eea | 112 | { |
bd5a75dc | 113 | /* Look for a free fluid number. */ |
9de87eea | 114 | for (n = 0; n < allocated_fluids_len; n++) |
bd5a75dc LC |
115 | /* TODO: Use `__sync_bool_compare_and_swap' where available. */ |
116 | if (allocated_fluids[n] == NULL) | |
9de87eea | 117 | break; |
bd5a75dc LC |
118 | |
119 | if (trial == 0 && n >= allocated_fluids_len) | |
120 | /* All fluid numbers are in use. Run a GC and retry. Explicitly | |
121 | running the GC is costly and bad-style. We only do this because | |
122 | dynamic state fluid vectors would grow unreasonably if fluid numbers | |
123 | weren't reused. */ | |
124 | scm_i_gc ("fluids"); | |
9de87eea | 125 | } |
bd5a75dc LC |
126 | |
127 | if (n >= allocated_fluids_len) | |
9de87eea | 128 | { |
8b039053 | 129 | /* Grow the vector of allocated fluids. */ |
bd5a75dc LC |
130 | void **new_allocated_fluids = |
131 | scm_gc_malloc_pointerless ((allocated_fluids_len + FLUID_GROW) | |
132 | * sizeof (*allocated_fluids), | |
133 | "allocated fluids"); | |
9de87eea MV |
134 | |
135 | /* Copy over old values and initialize rest. GC can not run | |
136 | during these two operations since there is no safe point in | |
bd5a75dc LC |
137 | them. */ |
138 | memcpy (new_allocated_fluids, allocated_fluids, | |
139 | allocated_fluids_len * sizeof (*allocated_fluids)); | |
140 | memset (new_allocated_fluids + allocated_fluids_len, 0, | |
141 | FLUID_GROW * sizeof (*allocated_fluids)); | |
9de87eea | 142 | n = allocated_fluids_len; |
d3075c52 | 143 | |
8b039053 LC |
144 | /* Update the vector of allocated fluids. Dynamic states will |
145 | eventually be lazily grown to accomodate the new value of | |
146 | ALLOCATED_FLUIDS_LEN in `fluid-ref' and `fluid-set!'. */ | |
9de87eea MV |
147 | allocated_fluids = new_allocated_fluids; |
148 | allocated_fluids_len += FLUID_GROW; | |
9de87eea | 149 | } |
bd5a75dc | 150 | |
21041372 | 151 | allocated_fluids[n] = SCM_UNPACK_POINTER (fluid); |
aafb4ed7 | 152 | SCM_SET_CELL_WORD_0 (fluid, (scm_tc7_fluid | (n << 8))); |
bd5a75dc LC |
153 | |
154 | GC_GENERAL_REGISTER_DISAPPEARING_LINK (&allocated_fluids[n], | |
0aed71aa | 155 | SCM2PTR (fluid)); |
bd5a75dc | 156 | |
661ae7ab | 157 | scm_dynwind_end (); |
0b77014f AW |
158 | |
159 | /* Now null out values. We could (and probably should) do this when | |
160 | the fluid is collected instead of now. */ | |
aafb4ed7 | 161 | scm_i_reset_fluid (n); |
0b77014f | 162 | |
bd5a75dc | 163 | return fluid; |
9482a297 MV |
164 | } |
165 | ||
aafb4ed7 AW |
166 | SCM |
167 | scm_make_fluid (void) | |
168 | { | |
169 | return new_fluid (SCM_BOOL_F); | |
170 | } | |
171 | ||
172 | SCM_DEFINE (scm_make_fluid_with_default, "make-fluid", 0, 1, 0, | |
173 | (SCM dflt), | |
f43622a2 AW |
174 | "Return a newly created fluid, whose initial value is @var{dflt},\n" |
175 | "or @code{#f} if @var{dflt} is not given.\n" | |
9de87eea MV |
176 | "Fluids are objects that can hold one\n" |
177 | "value per dynamic state. That is, modifications to this value are\n" | |
178 | "only visible to code that executes with the same dynamic state as\n" | |
179 | "the modifying code. When a new dynamic state is constructed, it\n" | |
180 | "inherits the values from its parent. Because each thread normally executes\n" | |
181 | "with its own dynamic state, you can use fluids for thread local storage.") | |
aafb4ed7 | 182 | #define FUNC_NAME s_scm_make_fluid_with_default |
9482a297 | 183 | { |
aafb4ed7 | 184 | return new_fluid (SCM_UNBNDP (dflt) ? SCM_BOOL_F : dflt); |
9482a297 | 185 | } |
1bbd0b84 | 186 | #undef FUNC_NAME |
9482a297 | 187 | |
e01163b5 | 188 | SCM_DEFINE (scm_make_unbound_fluid, "make-unbound-fluid", 0, 0, 0, |
ef94624e | 189 | (), |
e01163b5 AW |
190 | "Make a fluid that is initially unbound.") |
191 | #define FUNC_NAME s_scm_make_unbound_fluid | |
ef94624e | 192 | { |
aafb4ed7 | 193 | return new_fluid (SCM_UNDEFINED); |
ef94624e BT |
194 | } |
195 | #undef FUNC_NAME | |
196 | ||
a1ec6916 | 197 | SCM_DEFINE (scm_fluid_p, "fluid?", 1, 0, 0, |
ed4d7cee | 198 | (SCM obj), |
1e6808ea MG |
199 | "Return @code{#t} iff @var{obj} is a fluid; otherwise, return\n" |
200 | "@code{#f}.") | |
1bbd0b84 | 201 | #define FUNC_NAME s_scm_fluid_p |
b3460a50 | 202 | { |
9de87eea | 203 | return scm_from_bool (IS_FLUID (obj)); |
b3460a50 | 204 | } |
1bbd0b84 | 205 | #undef FUNC_NAME |
b3460a50 | 206 | |
9de87eea MV |
207 | int |
208 | scm_is_fluid (SCM obj) | |
209 | { | |
210 | return IS_FLUID (obj); | |
211 | } | |
212 | ||
ef94624e BT |
213 | /* Does not check type of `fluid'! */ |
214 | static SCM | |
215 | fluid_ref (SCM fluid) | |
9482a297 | 216 | { |
aafb4ed7 | 217 | SCM ret; |
9de87eea | 218 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 219 | |
8b039053 LC |
220 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) |
221 | { | |
8b039053 LC |
222 | /* Lazily grow the current thread's dynamic state. */ |
223 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
224 | ||
225 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
226 | } | |
227 | ||
aafb4ed7 AW |
228 | ret = SCM_SIMPLE_VECTOR_REF (fluids, FLUID_NUM (fluid)); |
229 | if (SCM_UNBNDP (ret)) | |
230 | return SCM_I_FLUID_DEFAULT (fluid); | |
231 | else | |
232 | return ret; | |
9482a297 | 233 | } |
ef94624e BT |
234 | |
235 | SCM_DEFINE (scm_fluid_ref, "fluid-ref", 1, 0, 0, | |
236 | (SCM fluid), | |
237 | "Return the value associated with @var{fluid} in the current\n" | |
238 | "dynamic root. If @var{fluid} has not been set, then return\n" | |
239 | "@code{#f}.") | |
240 | #define FUNC_NAME s_scm_fluid_ref | |
241 | { | |
242 | SCM val; | |
243 | SCM_VALIDATE_FLUID (1, fluid); | |
244 | val = fluid_ref (fluid); | |
245 | if (SCM_UNBNDP (val)) | |
246 | SCM_MISC_ERROR ("unbound fluid: ~S", | |
247 | scm_list_1 (fluid)); | |
248 | return val; | |
249 | } | |
1bbd0b84 | 250 | #undef FUNC_NAME |
9482a297 | 251 | |
a1ec6916 | 252 | SCM_DEFINE (scm_fluid_set_x, "fluid-set!", 2, 0, 0, |
ed4d7cee GB |
253 | (SCM fluid, SCM value), |
254 | "Set the value associated with @var{fluid} in the current dynamic root.") | |
1bbd0b84 | 255 | #define FUNC_NAME s_scm_fluid_set_x |
9482a297 | 256 | { |
9de87eea | 257 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 258 | |
ed4d7cee | 259 | SCM_VALIDATE_FLUID (1, fluid); |
8b039053 LC |
260 | |
261 | if (SCM_UNLIKELY (FLUID_NUM (fluid) >= SCM_SIMPLE_VECTOR_LENGTH (fluids))) | |
262 | { | |
8b039053 LC |
263 | /* Lazily grow the current thread's dynamic state. */ |
264 | grow_dynamic_state (SCM_I_CURRENT_THREAD->dynamic_state); | |
265 | ||
266 | fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
267 | } | |
268 | ||
9de87eea | 269 | SCM_SIMPLE_VECTOR_SET (fluids, FLUID_NUM (fluid), value); |
86f9f9ae | 270 | return SCM_UNSPECIFIED; |
9482a297 | 271 | } |
1bbd0b84 | 272 | #undef FUNC_NAME |
9482a297 | 273 | |
ef94624e BT |
274 | SCM_DEFINE (scm_fluid_unset_x, "fluid-unset!", 1, 0, 0, |
275 | (SCM fluid), | |
276 | "Unset the value associated with @var{fluid}.") | |
277 | #define FUNC_NAME s_scm_fluid_unset_x | |
278 | { | |
aafb4ed7 AW |
279 | /* FIXME: really unset the default value, too? The current test |
280 | suite demands it, but I would prefer not to. */ | |
281 | SCM_SET_CELL_OBJECT_1 (fluid, SCM_UNDEFINED); | |
ef94624e BT |
282 | return scm_fluid_set_x (fluid, SCM_UNDEFINED); |
283 | } | |
284 | #undef FUNC_NAME | |
285 | ||
286 | SCM_DEFINE (scm_fluid_bound_p, "fluid-bound?", 1, 0, 0, | |
287 | (SCM fluid), | |
288 | "Return @code{#t} iff @var{fluid} is bound to a value.\n" | |
289 | "Throw an error if @var{fluid} is not a fluid.") | |
290 | #define FUNC_NAME s_scm_fluid_bound_p | |
291 | { | |
292 | SCM val; | |
293 | SCM_VALIDATE_FLUID (1, fluid); | |
294 | val = fluid_ref (fluid); | |
295 | return scm_from_bool (! (SCM_UNBNDP (val))); | |
296 | } | |
297 | #undef FUNC_NAME | |
298 | ||
bb0229b5 AW |
299 | static SCM |
300 | apply_thunk (void *thunk) | |
b3460a50 | 301 | { |
bb0229b5 AW |
302 | return scm_call_0 (SCM_PACK (thunk)); |
303 | } | |
304 | ||
bb0229b5 | 305 | void |
98eaef1b | 306 | scm_swap_fluid (SCM fluid, SCM value_box, SCM dynstate) |
bb0229b5 | 307 | { |
98eaef1b AW |
308 | SCM fluid_vector, tmp; |
309 | size_t fluid_num; | |
b3460a50 | 310 | |
98eaef1b | 311 | fluid_num = FLUID_NUM (fluid); |
b3460a50 | 312 | |
98eaef1b | 313 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
b3460a50 | 314 | |
98eaef1b | 315 | if (SCM_UNLIKELY (fluid_num >= SCM_SIMPLE_VECTOR_LENGTH (fluid_vector))) |
bb0229b5 | 316 | { |
bb0229b5 AW |
317 | /* Lazily grow the current thread's dynamic state. */ |
318 | grow_dynamic_state (dynstate); | |
319 | ||
9ede013f | 320 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
bb0229b5 | 321 | } |
1bbd0b84 | 322 | |
98eaef1b AW |
323 | tmp = SCM_SIMPLE_VECTOR_REF (fluid_vector, fluid_num); |
324 | SCM_SIMPLE_VECTOR_SET (fluid_vector, fluid_num, SCM_VARIABLE_REF (value_box)); | |
325 | SCM_VARIABLE_SET (value_box, tmp); | |
bb0229b5 AW |
326 | } |
327 | ||
a1ec6916 | 328 | SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, |
ed4d7cee GB |
329 | (SCM fluids, SCM values, SCM thunk), |
330 | "Set @var{fluids} to @var{values} temporary, and call @var{thunk}.\n" | |
331 | "@var{fluids} must be a list of fluids and @var{values} must be the same\n" | |
332 | "number of their values to be applied. Each substitution is done\n" | |
333 | "one after another. @var{thunk} must be a procedure with no argument.") | |
1bbd0b84 GB |
334 | #define FUNC_NAME s_scm_with_fluids |
335 | { | |
bebd3fba MV |
336 | return scm_c_with_fluids (fluids, values, |
337 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
1bbd0b84 GB |
338 | } |
339 | #undef FUNC_NAME | |
b3460a50 MV |
340 | |
341 | SCM | |
143e0902 MV |
342 | scm_c_with_fluids (SCM fluids, SCM values, SCM (*cproc) (), void *cdata) |
343 | #define FUNC_NAME "scm_c_with_fluids" | |
b3460a50 | 344 | { |
9ede013f | 345 | SCM ans; |
bb0229b5 | 346 | long flen, vlen, i; |
9ede013f | 347 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
b3460a50 | 348 | |
c1bfcf60 | 349 | SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); |
ed4d7cee | 350 | SCM_VALIDATE_LIST_COPYLEN (2, values, vlen); |
b3460a50 | 351 | if (flen != vlen) |
ed4d7cee | 352 | scm_out_of_range (s_scm_with_fluids, values); |
b3460a50 | 353 | |
bb0229b5 AW |
354 | for (i = 0; i < flen; i++) |
355 | { | |
98eaef1b AW |
356 | scm_dynstack_push_fluid (&thread->dynstack, |
357 | SCM_CAR (fluids), SCM_CAR (values), | |
358 | thread->dynamic_state); | |
bb0229b5 | 359 | fluids = SCM_CDR (fluids); |
bb0229b5 AW |
360 | values = SCM_CDR (values); |
361 | } | |
362 | ||
b3460a50 | 363 | ans = cproc (cdata); |
98eaef1b AW |
364 | |
365 | for (i = 0; i < flen; i++) | |
366 | scm_dynstack_unwind_fluid (&thread->dynstack, thread->dynamic_state); | |
bb0229b5 | 367 | |
b3460a50 MV |
368 | return ans; |
369 | } | |
c1bfcf60 | 370 | #undef FUNC_NAME |
b3460a50 | 371 | |
c32b7c4c AW |
372 | SCM |
373 | scm_with_fluid (SCM fluid, SCM value, SCM thunk) | |
bebd3fba MV |
374 | { |
375 | return scm_c_with_fluid (fluid, value, | |
376 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
377 | } | |
bebd3fba | 378 | |
143e0902 MV |
379 | SCM |
380 | scm_c_with_fluid (SCM fluid, SCM value, SCM (*cproc) (), void *cdata) | |
381 | #define FUNC_NAME "scm_c_with_fluid" | |
382 | { | |
9ede013f AW |
383 | SCM ans; |
384 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; | |
bebd3fba | 385 | |
98eaef1b AW |
386 | scm_dynstack_push_fluid (&thread->dynstack, fluid, value, |
387 | thread->dynamic_state); | |
bebd3fba | 388 | ans = cproc (cdata); |
98eaef1b | 389 | scm_dynstack_unwind_fluid (&thread->dynstack, thread->dynamic_state); |
bb0229b5 | 390 | |
bebd3fba | 391 | return ans; |
143e0902 MV |
392 | } |
393 | #undef FUNC_NAME | |
b3460a50 | 394 | |
ef20bf70 MV |
395 | static void |
396 | swap_fluid (SCM data) | |
397 | { | |
398 | SCM f = SCM_CAR (data); | |
ef94624e | 399 | SCM t = fluid_ref (f); |
ef20bf70 MV |
400 | scm_fluid_set_x (f, SCM_CDR (data)); |
401 | SCM_SETCDR (data, t); | |
402 | } | |
403 | ||
404 | void | |
661ae7ab | 405 | scm_dynwind_fluid (SCM fluid, SCM value) |
ef20bf70 MV |
406 | { |
407 | SCM data = scm_cons (fluid, value); | |
661ae7ab MV |
408 | scm_dynwind_rewind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); |
409 | scm_dynwind_unwind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); | |
ef20bf70 MV |
410 | } |
411 | ||
9de87eea MV |
412 | SCM |
413 | scm_i_make_initial_dynamic_state () | |
414 | { | |
415 | SCM fluids = scm_c_make_vector (allocated_fluids_len, SCM_BOOL_F); | |
9ea31741 | 416 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
417 | } |
418 | ||
419 | SCM_DEFINE (scm_make_dynamic_state, "make-dynamic-state", 0, 1, 0, | |
420 | (SCM parent), | |
421 | "Return a copy of the dynamic state object @var{parent}\n" | |
422 | "or of the current dynamic state when @var{parent} is omitted.") | |
423 | #define FUNC_NAME s_scm_make_dynamic_state | |
424 | { | |
9ea31741 | 425 | SCM fluids; |
9de87eea MV |
426 | |
427 | if (SCM_UNBNDP (parent)) | |
428 | parent = scm_current_dynamic_state (); | |
429 | ||
9ea31741 | 430 | SCM_ASSERT (IS_DYNAMIC_STATE (parent), parent, SCM_ARG1, FUNC_NAME); |
9de87eea | 431 | fluids = scm_vector_copy (DYNAMIC_STATE_FLUIDS (parent)); |
9ea31741 | 432 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
433 | } |
434 | #undef FUNC_NAME | |
435 | ||
436 | SCM_DEFINE (scm_dynamic_state_p, "dynamic-state?", 1, 0, 0, | |
437 | (SCM obj), | |
438 | "Return @code{#t} if @var{obj} is a dynamic state object;\n" | |
439 | "return @code{#f} otherwise") | |
440 | #define FUNC_NAME s_scm_dynamic_state_p | |
441 | { | |
442 | return scm_from_bool (IS_DYNAMIC_STATE (obj)); | |
443 | } | |
444 | #undef FUNC_NAME | |
445 | ||
446 | int | |
447 | scm_is_dynamic_state (SCM obj) | |
448 | { | |
449 | return IS_DYNAMIC_STATE (obj); | |
450 | } | |
451 | ||
452 | SCM_DEFINE (scm_current_dynamic_state, "current-dynamic-state", 0, 0, 0, | |
453 | (), | |
454 | "Return the current dynamic state object.") | |
455 | #define FUNC_NAME s_scm_current_dynamic_state | |
456 | { | |
457 | return SCM_I_CURRENT_THREAD->dynamic_state; | |
458 | } | |
459 | #undef FUNC_NAME | |
460 | ||
461 | SCM_DEFINE (scm_set_current_dynamic_state, "set-current-dynamic-state", 1,0,0, | |
462 | (SCM state), | |
463 | "Set the current dynamic state object to @var{state}\n" | |
464 | "and return the previous current dynamic state object.") | |
465 | #define FUNC_NAME s_scm_set_current_dynamic_state | |
466 | { | |
467 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
468 | SCM old = t->dynamic_state; | |
9ea31741 | 469 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, FUNC_NAME); |
9de87eea MV |
470 | t->dynamic_state = state; |
471 | return old; | |
472 | } | |
473 | #undef FUNC_NAME | |
474 | ||
475 | static void | |
476 | swap_dynamic_state (SCM loc) | |
477 | { | |
478 | SCM_SETCAR (loc, scm_set_current_dynamic_state (SCM_CAR (loc))); | |
479 | } | |
480 | ||
481 | void | |
661ae7ab | 482 | scm_dynwind_current_dynamic_state (SCM state) |
9de87eea MV |
483 | { |
484 | SCM loc = scm_cons (state, SCM_EOL); | |
9ea31741 | 485 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, NULL); |
661ae7ab | 486 | scm_dynwind_rewind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea | 487 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 488 | scm_dynwind_unwind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea MV |
489 | SCM_F_WIND_EXPLICITLY); |
490 | } | |
491 | ||
492 | void * | |
493 | scm_c_with_dynamic_state (SCM state, void *(*func)(void *), void *data) | |
494 | { | |
495 | void *result; | |
661ae7ab MV |
496 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
497 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 498 | result = func (data); |
661ae7ab | 499 | scm_dynwind_end (); |
9de87eea MV |
500 | return result; |
501 | } | |
502 | ||
503 | SCM_DEFINE (scm_with_dynamic_state, "with-dynamic-state", 2, 0, 0, | |
504 | (SCM state, SCM proc), | |
505 | "Call @var{proc} while @var{state} is the current dynamic\n" | |
506 | "state object.") | |
507 | #define FUNC_NAME s_scm_with_dynamic_state | |
508 | { | |
509 | SCM result; | |
661ae7ab MV |
510 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
511 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 512 | result = scm_call_0 (proc); |
661ae7ab | 513 | scm_dynwind_end (); |
9de87eea MV |
514 | return result; |
515 | } | |
516 | #undef FUNC_NAME | |
517 | ||
9de87eea | 518 | |
9482a297 MV |
519 | void |
520 | scm_init_fluids () | |
521 | { | |
a0599745 | 522 | #include "libguile/fluids.x" |
9482a297 | 523 | } |
89e00824 ML |
524 | |
525 | /* | |
526 | Local Variables: | |
527 | c-file-style: "gnu" | |
528 | End: | |
529 | */ |