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dbb605f5 | 1 | /* Copyright (C) 1996,1997,2000,2001, 2004, 2006, 2007, 2008 Free Software Foundation, Inc. |
9482a297 | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
9482a297 | 7 | * |
73be1d9e MV |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 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 | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
9482a297 | 17 | |
dbb605f5 LC |
18 | #ifdef HAVE_CONFIG_H |
19 | # include <config.h> | |
20 | #endif | |
21 | ||
9de87eea MV |
22 | #include <stdio.h> |
23 | #include <string.h> | |
1bbd0b84 | 24 | |
a0599745 MD |
25 | #include "libguile/_scm.h" |
26 | #include "libguile/print.h" | |
27 | #include "libguile/smob.h" | |
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" |
c96d76b8 | 34 | #include "libguile/lang.h" |
a0599745 | 35 | #include "libguile/validate.h" |
9482a297 | 36 | |
9de87eea MV |
37 | #define FLUID_GROW 20 |
38 | ||
39 | /* A lot of the complexity below stems from the desire to reuse fluid | |
40 | slots. Normally, fluids should be pretty global and long-lived | |
41 | things, so that reusing their slots should not be overly critical, | |
42 | but it is the right thing to do nevertheless. The code therefore | |
43 | puts the burdon on allocating and collection fluids and keeps | |
44 | accessing fluids lock free. This is achieved by manipulating the | |
45 | global state of the fluid machinery mostly in single threaded | |
46 | sections. | |
47 | ||
48 | Reusing a fluid slot means that it must be reset to #f in all | |
49 | dynamic states. We do this by maintaining a weak list of all | |
50 | dynamic states, which is used after a GC to do the resetting. | |
51 | ||
52 | Also, the fluid vectors in the dynamic states need to grow from | |
53 | time to time when more fluids are created. We do this in a single | |
54 | threaded section so that threads do not need to lock when accessing | |
55 | a fluid in the normal way. | |
56 | */ | |
9482a297 | 57 | |
9de87eea MV |
58 | static scm_i_pthread_mutex_t fluid_admin_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
59 | ||
60 | /* Protected by fluid_admin_mutex, but also accessed during GC. See | |
61 | next_fluid_num for a discussion of this. | |
62 | */ | |
63 | static size_t allocated_fluids_len = 0; | |
64 | static size_t allocated_fluids_num = 0; | |
65 | static char *allocated_fluids = NULL; | |
66 | ||
67 | static scm_t_bits tc16_fluid; | |
68 | ||
69 | #define IS_FLUID(x) SCM_SMOB_PREDICATE(tc16_fluid, (x)) | |
70 | #define FLUID_NUM(x) ((size_t)SCM_SMOB_DATA(x)) | |
71 | #define FLUID_NEXT(x) SCM_SMOB_OBJECT_2(x) | |
645dd3fc | 72 | #define FLUID_NEXT_LOC(x) SCM_SMOB_OBJECT_2_LOC(x) |
9de87eea MV |
73 | #define SET_FLUID_NEXT(x,y) SCM_SET_SMOB_OBJECT_2((x), (y)) |
74 | ||
75 | static scm_t_bits tc16_dynamic_state; | |
76 | ||
77 | #define IS_DYNAMIC_STATE(x) SCM_SMOB_PREDICATE(tc16_dynamic_state, (x)) | |
78 | #define DYNAMIC_STATE_FLUIDS(x) SCM_SMOB_OBJECT(x) | |
79 | #define SET_DYNAMIC_STATE_FLUIDS(x, y) SCM_SET_SMOB_OBJECT((x), (y)) | |
80 | #define DYNAMIC_STATE_NEXT(x) SCM_SMOB_OBJECT_2(x) | |
645dd3fc | 81 | #define DYNAMIC_STATE_NEXT_LOC(x) SCM_SMOB_OBJECT_2_LOC(x) |
9de87eea MV |
82 | #define SET_DYNAMIC_STATE_NEXT(x, y) SCM_SET_SMOB_OBJECT_2((x), (y)) |
83 | ||
84 | /* Weak lists of all dynamic states and all fluids. | |
85 | */ | |
86 | static SCM all_dynamic_states = SCM_EOL; | |
87 | static SCM all_fluids = SCM_EOL; | |
88 | ||
9de87eea MV |
89 | /* Make sure that all states have the right size. This must be called |
90 | while fluid_admin_mutex is held. | |
91 | */ | |
9482a297 | 92 | static void |
b5fa979c | 93 | resize_all_states () |
9de87eea | 94 | { |
b5fa979c MV |
95 | SCM new_vectors, state; |
96 | ||
97 | /* Replacing the vector of a dynamic state must be done atomically: | |
98 | the old values must be copied into the new vector and the new | |
99 | vector must be installed without someone modifying the old vector | |
100 | concurrently. Since accessing a fluid should be lock-free, we | |
101 | need to put all threads to sleep when replacing a vector. | |
102 | However, when being single threaded, it is best not to do much. | |
103 | Therefore, we allocate the new vectors before going single | |
104 | threaded. | |
105 | */ | |
9de87eea | 106 | |
b5fa979c MV |
107 | new_vectors = SCM_EOL; |
108 | for (state = all_dynamic_states; !scm_is_null (state); | |
109 | state = DYNAMIC_STATE_NEXT (state)) | |
110 | new_vectors = scm_cons (scm_c_make_vector (allocated_fluids_len, | |
111 | SCM_BOOL_F), | |
112 | new_vectors); | |
9de87eea | 113 | |
b5fa979c | 114 | scm_i_thread_put_to_sleep (); |
9de87eea MV |
115 | for (state = all_dynamic_states; !scm_is_null (state); |
116 | state = DYNAMIC_STATE_NEXT (state)) | |
b5fa979c MV |
117 | { |
118 | SCM old_fluids = DYNAMIC_STATE_FLUIDS (state); | |
119 | SCM new_fluids = SCM_CAR (new_vectors); | |
120 | size_t i, old_len = SCM_SIMPLE_VECTOR_LENGTH (old_fluids); | |
9de87eea | 121 | |
b5fa979c MV |
122 | for (i = 0; i < old_len; i++) |
123 | SCM_SIMPLE_VECTOR_SET (new_fluids, i, | |
124 | SCM_SIMPLE_VECTOR_REF (old_fluids, i)); | |
125 | SET_DYNAMIC_STATE_FLUIDS (state, new_fluids); | |
126 | new_vectors = SCM_CDR (new_vectors); | |
127 | } | |
128 | scm_i_thread_wake_up (); | |
9de87eea MV |
129 | } |
130 | ||
131 | /* This is called during GC, that is, while being single threaded. | |
132 | See next_fluid_num for a discussion why it is safe to access | |
133 | allocated_fluids here. | |
134 | */ | |
135 | static void * | |
136 | scan_dynamic_states_and_fluids (void *dummy1 SCM_UNUSED, | |
137 | void *dummy2 SCM_UNUSED, | |
138 | void *dummy3 SCM_UNUSED) | |
9482a297 | 139 | { |
26224b3f LC |
140 | /* FIXME: What to do here? */ |
141 | #if 0 | |
9de87eea | 142 | SCM *statep, *fluidp; |
9482a297 | 143 | |
9de87eea MV |
144 | /* Scan all fluids and deallocate the unmarked ones. |
145 | */ | |
146 | fluidp = &all_fluids; | |
147 | while (!scm_is_null (*fluidp)) | |
9482a297 | 148 | { |
9de87eea MV |
149 | if (!SCM_GC_MARK_P (*fluidp)) |
150 | { | |
151 | allocated_fluids_num -= 1; | |
152 | allocated_fluids[FLUID_NUM (*fluidp)] = 0; | |
153 | *fluidp = FLUID_NEXT (*fluidp); | |
154 | } | |
155 | else | |
645dd3fc | 156 | fluidp = FLUID_NEXT_LOC (*fluidp); |
9482a297 | 157 | } |
9de87eea MV |
158 | |
159 | /* Scan all dynamic states and remove the unmarked ones. The live | |
160 | ones are updated for unallocated fluids. | |
161 | */ | |
162 | statep = &all_dynamic_states; | |
163 | while (!scm_is_null (*statep)) | |
9482a297 | 164 | { |
9de87eea MV |
165 | if (!SCM_GC_MARK_P (*statep)) |
166 | *statep = DYNAMIC_STATE_NEXT (*statep); | |
167 | else | |
168 | { | |
169 | SCM fluids = DYNAMIC_STATE_FLUIDS (*statep); | |
170 | size_t len, i; | |
171 | ||
172 | len = SCM_SIMPLE_VECTOR_LENGTH (fluids); | |
173 | for (i = 0; i < len && i < allocated_fluids_len; i++) | |
174 | if (allocated_fluids[i] == 0) | |
175 | SCM_SIMPLE_VECTOR_SET (fluids, i, SCM_BOOL_F); | |
176 | ||
645dd3fc | 177 | statep = DYNAMIC_STATE_NEXT_LOC (*statep); |
9de87eea | 178 | } |
9482a297 MV |
179 | } |
180 | ||
26224b3f | 181 | #endif |
9de87eea | 182 | return NULL; |
9482a297 MV |
183 | } |
184 | ||
9482a297 | 185 | static int |
e81d98ec | 186 | fluid_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
9482a297 | 187 | { |
ed4d7cee | 188 | scm_puts ("#<fluid ", port); |
9de87eea | 189 | scm_intprint ((int) FLUID_NUM (exp), 10, port); |
ed4d7cee GB |
190 | scm_putc ('>', port); |
191 | return 1; | |
9482a297 MV |
192 | } |
193 | ||
9de87eea | 194 | static size_t |
ed4d7cee | 195 | next_fluid_num () |
9482a297 | 196 | { |
9de87eea MV |
197 | size_t n; |
198 | ||
661ae7ab MV |
199 | scm_dynwind_begin (0); |
200 | scm_i_dynwind_pthread_mutex_lock (&fluid_admin_mutex); | |
9de87eea | 201 | |
29295b0c NJ |
202 | if ((allocated_fluids_len > 0) && |
203 | (allocated_fluids_num == allocated_fluids_len)) | |
9de87eea MV |
204 | { |
205 | /* All fluid numbers are in use. Run a GC to try to free some | |
206 | up. | |
207 | */ | |
208 | scm_gc (); | |
209 | } | |
210 | ||
211 | if (allocated_fluids_num < allocated_fluids_len) | |
212 | { | |
213 | for (n = 0; n < allocated_fluids_len; n++) | |
214 | if (allocated_fluids[n] == 0) | |
215 | break; | |
216 | } | |
217 | else | |
218 | { | |
219 | /* During the following call, the GC might run and elements of | |
220 | allocated_fluids might bet set to zero. Also, | |
221 | allocated_fluids and allocated_fluids_len are used to scan | |
222 | all dynamic states during GC. Thus we need to make sure that | |
223 | no GC can run while updating these two variables. | |
224 | */ | |
225 | ||
d3075c52 LC |
226 | char *prev_allocated_fluids; |
227 | char *new_allocated_fluids = | |
9de87eea MV |
228 | scm_malloc (allocated_fluids_len + FLUID_GROW); |
229 | ||
230 | /* Copy over old values and initialize rest. GC can not run | |
231 | during these two operations since there is no safe point in | |
232 | them. | |
233 | */ | |
234 | memcpy (new_allocated_fluids, allocated_fluids, allocated_fluids_len); | |
235 | memset (new_allocated_fluids + allocated_fluids_len, 0, FLUID_GROW); | |
236 | n = allocated_fluids_len; | |
d3075c52 LC |
237 | |
238 | prev_allocated_fluids = allocated_fluids; | |
9de87eea MV |
239 | allocated_fluids = new_allocated_fluids; |
240 | allocated_fluids_len += FLUID_GROW; | |
d3075c52 LC |
241 | |
242 | if (prev_allocated_fluids != NULL) | |
243 | free (prev_allocated_fluids); | |
244 | ||
9de87eea MV |
245 | /* Now allocated_fluids and allocated_fluids_len are valid again |
246 | and we can allow GCs to occur. | |
247 | */ | |
b5fa979c | 248 | resize_all_states (); |
9de87eea MV |
249 | } |
250 | ||
251 | allocated_fluids_num += 1; | |
252 | allocated_fluids[n] = 1; | |
253 | ||
661ae7ab | 254 | scm_dynwind_end (); |
9482a297 MV |
255 | return n; |
256 | } | |
257 | ||
a1ec6916 | 258 | SCM_DEFINE (scm_make_fluid, "make-fluid", 0, 0, 0, |
ed4d7cee GB |
259 | (), |
260 | "Return a newly created fluid.\n" | |
9de87eea MV |
261 | "Fluids are objects that can hold one\n" |
262 | "value per dynamic state. That is, modifications to this value are\n" | |
263 | "only visible to code that executes with the same dynamic state as\n" | |
264 | "the modifying code. When a new dynamic state is constructed, it\n" | |
265 | "inherits the values from its parent. Because each thread normally executes\n" | |
266 | "with its own dynamic state, you can use fluids for thread local storage.") | |
1bbd0b84 | 267 | #define FUNC_NAME s_scm_make_fluid |
9482a297 | 268 | { |
9de87eea | 269 | SCM fluid; |
9482a297 | 270 | |
9de87eea MV |
271 | SCM_NEWSMOB2 (fluid, tc16_fluid, |
272 | (scm_t_bits) next_fluid_num (), SCM_UNPACK (SCM_EOL)); | |
273 | ||
274 | /* The GC must not run until the fluid is properly entered into the | |
275 | list. | |
276 | */ | |
b5fa979c | 277 | scm_i_scm_pthread_mutex_lock (&fluid_admin_mutex); |
9de87eea MV |
278 | SET_FLUID_NEXT (fluid, all_fluids); |
279 | all_fluids = fluid; | |
b5fa979c | 280 | scm_i_pthread_mutex_unlock (&fluid_admin_mutex); |
9de87eea MV |
281 | |
282 | return fluid; | |
9482a297 | 283 | } |
1bbd0b84 | 284 | #undef FUNC_NAME |
9482a297 | 285 | |
a1ec6916 | 286 | SCM_DEFINE (scm_fluid_p, "fluid?", 1, 0, 0, |
ed4d7cee | 287 | (SCM obj), |
1e6808ea MG |
288 | "Return @code{#t} iff @var{obj} is a fluid; otherwise, return\n" |
289 | "@code{#f}.") | |
1bbd0b84 | 290 | #define FUNC_NAME s_scm_fluid_p |
b3460a50 | 291 | { |
9de87eea | 292 | return scm_from_bool (IS_FLUID (obj)); |
b3460a50 | 293 | } |
1bbd0b84 | 294 | #undef FUNC_NAME |
b3460a50 | 295 | |
9de87eea MV |
296 | int |
297 | scm_is_fluid (SCM obj) | |
298 | { | |
299 | return IS_FLUID (obj); | |
300 | } | |
301 | ||
302 | size_t | |
303 | scm_i_fluid_num (SCM fluid) | |
304 | { | |
305 | return FLUID_NUM (fluid); | |
306 | } | |
307 | ||
a1ec6916 | 308 | SCM_DEFINE (scm_fluid_ref, "fluid-ref", 1, 0, 0, |
ed4d7cee | 309 | (SCM fluid), |
1e6808ea MG |
310 | "Return the value associated with @var{fluid} in the current\n" |
311 | "dynamic root. If @var{fluid} has not been set, then return\n" | |
312 | "@code{#f}.") | |
1bbd0b84 | 313 | #define FUNC_NAME s_scm_fluid_ref |
9482a297 | 314 | { |
9de87eea | 315 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 316 | |
ed4d7cee | 317 | SCM_VALIDATE_FLUID (1, fluid); |
9de87eea | 318 | return SCM_SIMPLE_VECTOR_REF (fluids, FLUID_NUM (fluid)); |
9482a297 | 319 | } |
1bbd0b84 | 320 | #undef FUNC_NAME |
9482a297 | 321 | |
9de87eea MV |
322 | SCM |
323 | scm_i_fast_fluid_ref (size_t n) | |
324 | { | |
325 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
326 | return SCM_SIMPLE_VECTOR_REF (fluids, n); | |
327 | } | |
328 | ||
a1ec6916 | 329 | SCM_DEFINE (scm_fluid_set_x, "fluid-set!", 2, 0, 0, |
ed4d7cee GB |
330 | (SCM fluid, SCM value), |
331 | "Set the value associated with @var{fluid} in the current dynamic root.") | |
1bbd0b84 | 332 | #define FUNC_NAME s_scm_fluid_set_x |
9482a297 | 333 | { |
9de87eea | 334 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); |
9482a297 | 335 | |
ed4d7cee | 336 | SCM_VALIDATE_FLUID (1, fluid); |
9de87eea | 337 | SCM_SIMPLE_VECTOR_SET (fluids, FLUID_NUM (fluid), value); |
86f9f9ae | 338 | return SCM_UNSPECIFIED; |
9482a297 | 339 | } |
1bbd0b84 | 340 | #undef FUNC_NAME |
9482a297 | 341 | |
9de87eea MV |
342 | void |
343 | scm_i_fast_fluid_set_x (size_t n, SCM value) | |
344 | { | |
345 | SCM fluids = DYNAMIC_STATE_FLUIDS (SCM_I_CURRENT_THREAD->dynamic_state); | |
346 | SCM_SIMPLE_VECTOR_SET (fluids, n, value); | |
347 | } | |
348 | ||
bebd3fba MV |
349 | static void |
350 | swap_fluids (SCM data) | |
b3460a50 | 351 | { |
bebd3fba MV |
352 | SCM fluids = SCM_CAR (data), vals = SCM_CDR (data); |
353 | ||
c96d76b8 | 354 | while (!SCM_NULL_OR_NIL_P (fluids)) |
b3460a50 MV |
355 | { |
356 | SCM fl = SCM_CAR (fluids); | |
357 | SCM old_val = scm_fluid_ref (fl); | |
358 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
359 | SCM_SETCAR (vals, old_val); | |
360 | fluids = SCM_CDR (fluids); | |
361 | vals = SCM_CDR (vals); | |
362 | } | |
363 | } | |
364 | ||
365 | /* Swap the fluid values in reverse order. This is important when the | |
9de87eea MV |
366 | same fluid appears multiple times in the fluids list. |
367 | */ | |
b3460a50 | 368 | |
bebd3fba MV |
369 | static void |
370 | swap_fluids_reverse_aux (SCM fluids, SCM vals) | |
b3460a50 | 371 | { |
c96d76b8 | 372 | if (!SCM_NULL_OR_NIL_P (fluids)) |
b3460a50 MV |
373 | { |
374 | SCM fl, old_val; | |
375 | ||
bebd3fba | 376 | swap_fluids_reverse_aux (SCM_CDR (fluids), SCM_CDR (vals)); |
b3460a50 MV |
377 | fl = SCM_CAR (fluids); |
378 | old_val = scm_fluid_ref (fl); | |
379 | scm_fluid_set_x (fl, SCM_CAR (vals)); | |
380 | SCM_SETCAR (vals, old_val); | |
381 | } | |
382 | } | |
383 | ||
bebd3fba MV |
384 | static void |
385 | swap_fluids_reverse (SCM data) | |
386 | { | |
387 | swap_fluids_reverse_aux (SCM_CAR (data), SCM_CDR (data)); | |
388 | } | |
1bbd0b84 GB |
389 | |
390 | static SCM | |
391 | apply_thunk (void *thunk) | |
392 | { | |
fdc28395 | 393 | return scm_call_0 (SCM_PACK (thunk)); |
1bbd0b84 GB |
394 | } |
395 | ||
a1ec6916 | 396 | SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, |
ed4d7cee GB |
397 | (SCM fluids, SCM values, SCM thunk), |
398 | "Set @var{fluids} to @var{values} temporary, and call @var{thunk}.\n" | |
399 | "@var{fluids} must be a list of fluids and @var{values} must be the same\n" | |
400 | "number of their values to be applied. Each substitution is done\n" | |
401 | "one after another. @var{thunk} must be a procedure with no argument.") | |
1bbd0b84 GB |
402 | #define FUNC_NAME s_scm_with_fluids |
403 | { | |
bebd3fba MV |
404 | return scm_c_with_fluids (fluids, values, |
405 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
1bbd0b84 GB |
406 | } |
407 | #undef FUNC_NAME | |
b3460a50 MV |
408 | |
409 | SCM | |
143e0902 MV |
410 | scm_c_with_fluids (SCM fluids, SCM values, SCM (*cproc) (), void *cdata) |
411 | #define FUNC_NAME "scm_c_with_fluids" | |
b3460a50 | 412 | { |
bebd3fba | 413 | SCM ans, data; |
c014a02e | 414 | long flen, vlen; |
b3460a50 | 415 | |
c1bfcf60 | 416 | SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); |
ed4d7cee | 417 | SCM_VALIDATE_LIST_COPYLEN (2, values, vlen); |
b3460a50 | 418 | if (flen != vlen) |
ed4d7cee | 419 | scm_out_of_range (s_scm_with_fluids, values); |
b3460a50 | 420 | |
bebd3fba MV |
421 | if (flen == 1) |
422 | return scm_c_with_fluid (SCM_CAR (fluids), SCM_CAR (values), | |
423 | cproc, cdata); | |
424 | ||
425 | data = scm_cons (fluids, values); | |
661ae7ab MV |
426 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
427 | scm_dynwind_rewind_handler_with_scm (swap_fluids, data, | |
16c5cac2 | 428 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 429 | scm_dynwind_unwind_handler_with_scm (swap_fluids_reverse, data, |
16c5cac2 | 430 | SCM_F_WIND_EXPLICITLY); |
b3460a50 | 431 | ans = cproc (cdata); |
661ae7ab | 432 | scm_dynwind_end (); |
b3460a50 MV |
433 | return ans; |
434 | } | |
c1bfcf60 | 435 | #undef FUNC_NAME |
b3460a50 | 436 | |
bebd3fba MV |
437 | SCM_DEFINE (scm_with_fluid, "with-fluid*", 3, 0, 0, |
438 | (SCM fluid, SCM value, SCM thunk), | |
439 | "Set @var{fluid} to @var{value} temporarily, and call @var{thunk}.\n" | |
440 | "@var{thunk} must be a procedure with no argument.") | |
441 | #define FUNC_NAME s_scm_with_fluid | |
442 | { | |
443 | return scm_c_with_fluid (fluid, value, | |
444 | apply_thunk, (void *) SCM_UNPACK (thunk)); | |
445 | } | |
446 | #undef FUNC_NAME | |
447 | ||
143e0902 MV |
448 | SCM |
449 | scm_c_with_fluid (SCM fluid, SCM value, SCM (*cproc) (), void *cdata) | |
450 | #define FUNC_NAME "scm_c_with_fluid" | |
451 | { | |
bebd3fba MV |
452 | SCM ans; |
453 | ||
661ae7ab MV |
454 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
455 | scm_dynwind_fluid (fluid, value); | |
bebd3fba | 456 | ans = cproc (cdata); |
661ae7ab | 457 | scm_dynwind_end (); |
bebd3fba | 458 | return ans; |
143e0902 MV |
459 | } |
460 | #undef FUNC_NAME | |
b3460a50 | 461 | |
ef20bf70 MV |
462 | static void |
463 | swap_fluid (SCM data) | |
464 | { | |
465 | SCM f = SCM_CAR (data); | |
466 | SCM t = scm_fluid_ref (f); | |
467 | scm_fluid_set_x (f, SCM_CDR (data)); | |
468 | SCM_SETCDR (data, t); | |
469 | } | |
470 | ||
471 | void | |
661ae7ab | 472 | scm_dynwind_fluid (SCM fluid, SCM value) |
ef20bf70 MV |
473 | { |
474 | SCM data = scm_cons (fluid, value); | |
661ae7ab MV |
475 | scm_dynwind_rewind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); |
476 | scm_dynwind_unwind_handler_with_scm (swap_fluid, data, SCM_F_WIND_EXPLICITLY); | |
ef20bf70 MV |
477 | } |
478 | ||
9de87eea MV |
479 | SCM |
480 | scm_i_make_initial_dynamic_state () | |
481 | { | |
482 | SCM fluids = scm_c_make_vector (allocated_fluids_len, SCM_BOOL_F); | |
483 | SCM state; | |
484 | SCM_NEWSMOB2 (state, tc16_dynamic_state, | |
485 | SCM_UNPACK (fluids), SCM_UNPACK (SCM_EOL)); | |
486 | all_dynamic_states = state; | |
487 | return state; | |
488 | } | |
489 | ||
490 | SCM_DEFINE (scm_make_dynamic_state, "make-dynamic-state", 0, 1, 0, | |
491 | (SCM parent), | |
492 | "Return a copy of the dynamic state object @var{parent}\n" | |
493 | "or of the current dynamic state when @var{parent} is omitted.") | |
494 | #define FUNC_NAME s_scm_make_dynamic_state | |
495 | { | |
496 | SCM fluids, state; | |
497 | ||
498 | if (SCM_UNBNDP (parent)) | |
499 | parent = scm_current_dynamic_state (); | |
500 | ||
501 | scm_assert_smob_type (tc16_dynamic_state, parent); | |
502 | fluids = scm_vector_copy (DYNAMIC_STATE_FLUIDS (parent)); | |
503 | SCM_NEWSMOB2 (state, tc16_dynamic_state, | |
504 | SCM_UNPACK (fluids), SCM_UNPACK (SCM_EOL)); | |
505 | ||
506 | /* The GC must not run until the state is properly entered into the | |
507 | list. | |
508 | */ | |
b5fa979c | 509 | scm_i_scm_pthread_mutex_lock (&fluid_admin_mutex); |
9de87eea MV |
510 | SET_DYNAMIC_STATE_NEXT (state, all_dynamic_states); |
511 | all_dynamic_states = state; | |
b5fa979c | 512 | scm_i_pthread_mutex_unlock (&fluid_admin_mutex); |
9de87eea | 513 | |
9de87eea MV |
514 | return state; |
515 | } | |
516 | #undef FUNC_NAME | |
517 | ||
518 | SCM_DEFINE (scm_dynamic_state_p, "dynamic-state?", 1, 0, 0, | |
519 | (SCM obj), | |
520 | "Return @code{#t} if @var{obj} is a dynamic state object;\n" | |
521 | "return @code{#f} otherwise") | |
522 | #define FUNC_NAME s_scm_dynamic_state_p | |
523 | { | |
524 | return scm_from_bool (IS_DYNAMIC_STATE (obj)); | |
525 | } | |
526 | #undef FUNC_NAME | |
527 | ||
528 | int | |
529 | scm_is_dynamic_state (SCM obj) | |
530 | { | |
531 | return IS_DYNAMIC_STATE (obj); | |
532 | } | |
533 | ||
534 | SCM_DEFINE (scm_current_dynamic_state, "current-dynamic-state", 0, 0, 0, | |
535 | (), | |
536 | "Return the current dynamic state object.") | |
537 | #define FUNC_NAME s_scm_current_dynamic_state | |
538 | { | |
539 | return SCM_I_CURRENT_THREAD->dynamic_state; | |
540 | } | |
541 | #undef FUNC_NAME | |
542 | ||
543 | SCM_DEFINE (scm_set_current_dynamic_state, "set-current-dynamic-state", 1,0,0, | |
544 | (SCM state), | |
545 | "Set the current dynamic state object to @var{state}\n" | |
546 | "and return the previous current dynamic state object.") | |
547 | #define FUNC_NAME s_scm_set_current_dynamic_state | |
548 | { | |
549 | scm_i_thread *t = SCM_I_CURRENT_THREAD; | |
550 | SCM old = t->dynamic_state; | |
551 | scm_assert_smob_type (tc16_dynamic_state, state); | |
552 | t->dynamic_state = state; | |
553 | return old; | |
554 | } | |
555 | #undef FUNC_NAME | |
556 | ||
557 | static void | |
558 | swap_dynamic_state (SCM loc) | |
559 | { | |
560 | SCM_SETCAR (loc, scm_set_current_dynamic_state (SCM_CAR (loc))); | |
561 | } | |
562 | ||
563 | void | |
661ae7ab | 564 | scm_dynwind_current_dynamic_state (SCM state) |
9de87eea MV |
565 | { |
566 | SCM loc = scm_cons (state, SCM_EOL); | |
567 | scm_assert_smob_type (tc16_dynamic_state, state); | |
661ae7ab | 568 | scm_dynwind_rewind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea | 569 | SCM_F_WIND_EXPLICITLY); |
661ae7ab | 570 | scm_dynwind_unwind_handler_with_scm (swap_dynamic_state, loc, |
9de87eea MV |
571 | SCM_F_WIND_EXPLICITLY); |
572 | } | |
573 | ||
574 | void * | |
575 | scm_c_with_dynamic_state (SCM state, void *(*func)(void *), void *data) | |
576 | { | |
577 | void *result; | |
661ae7ab MV |
578 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
579 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 580 | result = func (data); |
661ae7ab | 581 | scm_dynwind_end (); |
9de87eea MV |
582 | return result; |
583 | } | |
584 | ||
585 | SCM_DEFINE (scm_with_dynamic_state, "with-dynamic-state", 2, 0, 0, | |
586 | (SCM state, SCM proc), | |
587 | "Call @var{proc} while @var{state} is the current dynamic\n" | |
588 | "state object.") | |
589 | #define FUNC_NAME s_scm_with_dynamic_state | |
590 | { | |
591 | SCM result; | |
661ae7ab MV |
592 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
593 | scm_dynwind_current_dynamic_state (state); | |
9de87eea | 594 | result = scm_call_0 (proc); |
661ae7ab | 595 | scm_dynwind_end (); |
9de87eea MV |
596 | return result; |
597 | } | |
598 | #undef FUNC_NAME | |
599 | ||
600 | void | |
601 | scm_fluids_prehistory () | |
602 | { | |
603 | tc16_fluid = scm_make_smob_type ("fluid", 0); | |
9de87eea MV |
604 | scm_set_smob_print (tc16_fluid, fluid_print); |
605 | ||
606 | tc16_dynamic_state = scm_make_smob_type ("dynamic-state", 0); | |
9de87eea MV |
607 | |
608 | scm_c_hook_add (&scm_after_sweep_c_hook, scan_dynamic_states_and_fluids, | |
609 | 0, 0); | |
610 | } | |
611 | ||
9482a297 MV |
612 | void |
613 | scm_init_fluids () | |
614 | { | |
a0599745 | 615 | #include "libguile/fluids.x" |
9482a297 | 616 | } |
89e00824 ML |
617 | |
618 | /* | |
619 | Local Variables: | |
620 | c-file-style: "gnu" | |
621 | End: | |
622 | */ |