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 | ||
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 | ||
9ede013f AW |
305 | size_t |
306 | scm_prepare_fluids (size_t n, SCM *fluids, SCM *values) | |
bb0229b5 | 307 | { |
26d14806 | 308 | size_t j; |
bb0229b5 AW |
309 | |
310 | /* Ensure that there are no duplicates in the fluids set -- an N^2 operation, | |
311 | but N will usually be small, so perhaps that's OK. */ | |
26d14806 | 312 | for (j = n; j--;) |
9ede013f AW |
313 | { |
314 | size_t i; | |
315 | ||
316 | if (SCM_UNLIKELY (!IS_FLUID (fluids[j]))) | |
317 | scm_wrong_type_arg ("with-fluids", 0, fluids[j]); | |
bb0229b5 | 318 | |
8dd01861 | 319 | for (i = j; i--;) |
d223c3fc | 320 | if (scm_is_eq (fluids[i], fluids[j])) |
bb0229b5 | 321 | { |
9ede013f | 322 | values[i] = values[j]; /* later bindings win */ |
bb0229b5 | 323 | n--; |
b8d8f8b9 | 324 | fluids[j] = fluids[n]; |
26d14806 | 325 | values[j] = values[n]; |
bb0229b5 AW |
326 | break; |
327 | } | |
b3460a50 | 328 | } |
bb0229b5 | 329 | |
9ede013f | 330 | return n; |
b3460a50 | 331 | } |
bb0229b5 AW |
332 | |
333 | void | |
9ede013f | 334 | scm_swap_fluids (size_t n, SCM *fluids, SCM *values, SCM dynstate) |
bb0229b5 | 335 | { |
9ede013f | 336 | SCM fluid_vector; |
bb0229b5 | 337 | size_t i, max = 0; |
b3460a50 | 338 | |
9ede013f | 339 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
b3460a50 | 340 | |
bb0229b5 AW |
341 | /* We could cache the max in the with-fluids, but that would take more mem, |
342 | and we're touching all the fluids anyway, so this per-swap traversal should | |
343 | be OK. */ | |
9ede013f | 344 | for (i = 0; i < n; i++) |
b3460a50 | 345 | { |
9ede013f | 346 | size_t num = FLUID_NUM (fluids[i]); |
bb0229b5 | 347 | max = (max > num) ? max : num; |
b3460a50 | 348 | } |
b3460a50 | 349 | |
9ede013f | 350 | if (SCM_UNLIKELY (max >= SCM_SIMPLE_VECTOR_LENGTH (fluid_vector))) |
bb0229b5 | 351 | { |
bb0229b5 AW |
352 | /* Lazily grow the current thread's dynamic state. */ |
353 | grow_dynamic_state (dynstate); | |
354 | ||
9ede013f | 355 | fluid_vector = DYNAMIC_STATE_FLUIDS (dynstate); |
bb0229b5 | 356 | } |
1bbd0b84 | 357 | |
bb0229b5 | 358 | /* Bind the fluids. Order doesn't matter, as all fluids are distinct. */ |
9ede013f | 359 | for (i = 0; i < n; i++) |
bb0229b5 AW |
360 | { |
361 | size_t fluid_num; | |
362 | SCM x; | |
363 | ||
9ede013f AW |
364 | fluid_num = FLUID_NUM (fluids[i]); |
365 | x = SCM_SIMPLE_VECTOR_REF (fluid_vector, fluid_num); | |
366 | SCM_SIMPLE_VECTOR_SET (fluid_vector, fluid_num, values[i]); | |
367 | values[i] = x; | |
bb0229b5 AW |
368 | } |
369 | } | |
370 | ||
a1ec6916 | 371 | SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, |
ed4d7cee GB |
372 | (SCM fluids, SCM values, SCM thunk), |
373 | "Set @var{fluids} to @var{values} temporary, and call @var{thunk}.\n" | |
374 | "@var{fluids} must be a list of fluids and @var{values} must be the same\n" | |
375 | "number of their values to be applied. Each substitution is done\n" | |
376 | "one after another. @var{thunk} must be a procedure with no argument.") | |
1bbd0b84 GB |
377 | #define FUNC_NAME s_scm_with_fluids |
378 | { | |
bebd3fba MV |
379 | return scm_c_with_fluids (fluids, values, |
380 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
1bbd0b84 GB |
381 | } |
382 | #undef FUNC_NAME | |
b3460a50 MV |
383 | |
384 | SCM | |
143e0902 MV |
385 | scm_c_with_fluids (SCM fluids, SCM values, SCM (*cproc) (), void *cdata) |
386 | #define FUNC_NAME "scm_c_with_fluids" | |
b3460a50 | 387 | { |
9ede013f | 388 | SCM ans; |
bb0229b5 AW |
389 | long flen, vlen, i; |
390 | SCM *fluidsv, *valuesv; | |
9ede013f | 391 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
b3460a50 | 392 | |
c1bfcf60 | 393 | SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); |
ed4d7cee | 394 | SCM_VALIDATE_LIST_COPYLEN (2, values, vlen); |
b3460a50 | 395 | if (flen != vlen) |
ed4d7cee | 396 | scm_out_of_range (s_scm_with_fluids, values); |
b3460a50 | 397 | |
bb0229b5 AW |
398 | if (SCM_UNLIKELY (flen == 0)) |
399 | return cproc (cdata); | |
400 | ||
401 | fluidsv = alloca (sizeof(SCM)*flen); | |
402 | valuesv = alloca (sizeof(SCM)*flen); | |
bebd3fba | 403 | |
bb0229b5 AW |
404 | for (i = 0; i < flen; i++) |
405 | { | |
406 | fluidsv[i] = SCM_CAR (fluids); | |
407 | fluids = SCM_CDR (fluids); | |
408 | valuesv[i] = SCM_CAR (values); | |
409 | values = SCM_CDR (values); | |
410 | } | |
411 | ||
9ede013f AW |
412 | scm_dynstack_push_fluids (&thread->dynstack, flen, fluidsv, valuesv, |
413 | thread->dynamic_state); | |
b3460a50 | 414 | ans = cproc (cdata); |
9ede013f | 415 | scm_dynstack_unwind_fluids (&thread->dynstack, thread->dynamic_state); |
bb0229b5 | 416 | |
b3460a50 MV |
417 | return ans; |
418 | } | |
c1bfcf60 | 419 | #undef FUNC_NAME |
b3460a50 | 420 | |
bebd3fba MV |
421 | SCM_DEFINE (scm_with_fluid, "with-fluid*", 3, 0, 0, |
422 | (SCM fluid, SCM value, SCM thunk), | |
423 | "Set @var{fluid} to @var{value} temporarily, and call @var{thunk}.\n" | |
424 | "@var{thunk} must be a procedure with no argument.") | |
425 | #define FUNC_NAME s_scm_with_fluid | |
426 | { | |
427 | return scm_c_with_fluid (fluid, value, | |
428 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
429 | } | |
430 | #undef FUNC_NAME | |
431 | ||
143e0902 MV |
432 | SCM |
433 | scm_c_with_fluid (SCM fluid, SCM value, SCM (*cproc) (), void *cdata) | |
434 | #define FUNC_NAME "scm_c_with_fluid" | |
435 | { | |
9ede013f AW |
436 | SCM ans; |
437 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; | |
bebd3fba | 438 | |
9ede013f AW |
439 | scm_dynstack_push_fluids (&thread->dynstack, 1, &fluid, &value, |
440 | thread->dynamic_state); | |
bebd3fba | 441 | ans = cproc (cdata); |
9ede013f | 442 | scm_dynstack_unwind_fluids (&thread->dynstack, thread->dynamic_state); |
bb0229b5 | 443 | |
bebd3fba | 444 | return ans; |
143e0902 MV |
445 | } |
446 | #undef FUNC_NAME | |
b3460a50 | 447 | |
ef20bf70 MV |
448 | static void |
449 | swap_fluid (SCM data) | |
450 | { | |
451 | SCM f = SCM_CAR (data); | |
ef94624e | 452 | SCM t = fluid_ref (f); |
ef20bf70 MV |
453 | scm_fluid_set_x (f, SCM_CDR (data)); |
454 | SCM_SETCDR (data, t); | |
455 | } | |
456 | ||
457 | void | |
661ae7ab | 458 | scm_dynwind_fluid (SCM fluid, SCM value) |
ef20bf70 MV |
459 | { |
460 | SCM data = scm_cons (fluid, value); | |
661ae7ab MV |
461 | scm_dynwind_rewind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); |
462 | scm_dynwind_unwind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); | |
ef20bf70 MV |
463 | } |
464 | ||
9de87eea MV |
465 | SCM |
466 | scm_i_make_initial_dynamic_state () | |
467 | { | |
468 | SCM fluids = scm_c_make_vector (allocated_fluids_len, SCM_BOOL_F); | |
9ea31741 | 469 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
470 | } |
471 | ||
472 | SCM_DEFINE (scm_make_dynamic_state, "make-dynamic-state", 0, 1, 0, | |
473 | (SCM parent), | |
474 | "Return a copy of the dynamic state object @var{parent}\n" | |
475 | "or of the current dynamic state when @var{parent} is omitted.") | |
476 | #define FUNC_NAME s_scm_make_dynamic_state | |
477 | { | |
9ea31741 | 478 | SCM fluids; |
9de87eea MV |
479 | |
480 | if (SCM_UNBNDP (parent)) | |
481 | parent = scm_current_dynamic_state (); | |
482 | ||
9ea31741 | 483 | SCM_ASSERT (IS_DYNAMIC_STATE (parent), parent, SCM_ARG1, FUNC_NAME); |
9de87eea | 484 | fluids = scm_vector_copy (DYNAMIC_STATE_FLUIDS (parent)); |
9ea31741 | 485 | return scm_cell (scm_tc7_dynamic_state, SCM_UNPACK (fluids)); |
9de87eea MV |
486 | } |
487 | #undef FUNC_NAME | |
488 | ||
489 | SCM_DEFINE (scm_dynamic_state_p, "dynamic-state?", 1, 0, 0, | |
490 | (SCM obj), | |
491 | "Return @code{#t} if @var{obj} is a dynamic state object;\n" | |
492 | "return @code{#f} otherwise") | |
493 | #define FUNC_NAME s_scm_dynamic_state_p | |
494 | { | |
495 | return scm_from_bool (IS_DYNAMIC_STATE (obj)); | |
496 | } | |
497 | #undef FUNC_NAME | |
498 | ||
499 | int | |
500 | scm_is_dynamic_state (SCM obj) | |
501 | { | |
502 | return IS_DYNAMIC_STATE (obj); | |
503 | } | |
504 | ||
505 | SCM_DEFINE (scm_current_dynamic_state, "current-dynamic-state", 0, 0, 0, | |
506 | (), | |
507 | "Return the current dynamic state object.") | |
508 | #define FUNC_NAME s_scm_current_dynamic_state | |
509 | { | |
510 | return SCM_I_CURRENT_THREAD->dynamic_state; | |
511 | } | |
512 | #undef FUNC_NAME | |
513 | ||
514 | SCM_DEFINE (scm_set_current_dynamic_state, "set-current-dynamic-state", 1,0,0, | |
515 | (SCM state), | |
516 | "Set the current dynamic state object to @var{state}\n" | |
517 | "and return the previous current dynamic state object.") | |
518 | #define FUNC_NAME s_scm_set_current_dynamic_state | |
519 | { | |
520 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
521 | SCM old = t->dynamic_state; | |
9ea31741 | 522 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, FUNC_NAME); |
9de87eea MV |
523 | t->dynamic_state = state; |
524 | return old; | |
525 | } | |
526 | #undef FUNC_NAME | |
527 | ||
528 | static void | |
529 | swap_dynamic_state (SCM loc) | |
530 | { | |
531 | SCM_SETCAR (loc, scm_set_current_dynamic_state (SCM_CAR (loc))); | |
532 | } | |
533 | ||
534 | void | |
661ae7ab | 535 | scm_dynwind_current_dynamic_state (SCM state) |
9de87eea MV |
536 | { |
537 | SCM loc = scm_cons (state, SCM_EOL); | |
9ea31741 | 538 | SCM_ASSERT (IS_DYNAMIC_STATE (state), state, SCM_ARG1, NULL); |
661ae7ab | 539 | scm_dynwind_rewind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea | 540 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 541 | scm_dynwind_unwind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea MV |
542 | SCM_F_WIND_EXPLICITLY); |
543 | } | |
544 | ||
545 | void * | |
546 | scm_c_with_dynamic_state (SCM state, void *(*func)(void *), void *data) | |
547 | { | |
548 | void *result; | |
661ae7ab MV |
549 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
550 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 551 | result = func (data); |
661ae7ab | 552 | scm_dynwind_end (); |
9de87eea MV |
553 | return result; |
554 | } | |
555 | ||
556 | SCM_DEFINE (scm_with_dynamic_state, "with-dynamic-state", 2, 0, 0, | |
557 | (SCM state, SCM proc), | |
558 | "Call @var{proc} while @var{state} is the current dynamic\n" | |
559 | "state object.") | |
560 | #define FUNC_NAME s_scm_with_dynamic_state | |
561 | { | |
562 | SCM result; | |
661ae7ab MV |
563 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
564 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 565 | result = scm_call_0 (proc); |
661ae7ab | 566 | scm_dynwind_end (); |
9de87eea MV |
567 | return result; |
568 | } | |
569 | #undef FUNC_NAME | |
570 | ||
9de87eea | 571 | |
9482a297 MV |
572 | void |
573 | scm_init_fluids () | |
574 | { | |
a0599745 | 575 | #include "libguile/fluids.x" |
9482a297 | 576 | } |
89e00824 ML |
577 | |
578 | /* | |
579 | Local Variables: | |
580 | c-file-style: "gnu" | |
581 | End: | |
582 | */ |