1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program 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
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
55 #define INITIAL_FLUIDS 10
56 #include "scm_validate.h"
58 static volatile int n_fluids
;
62 scm_make_initial_fluids ()
64 return scm_make_vector (SCM_MAKINUM (INITIAL_FLUIDS
),
69 grow_fluids (scm_root_state
*root_state
,int new_length
)
71 SCM old_fluids
, new_fluids
;
74 old_fluids
= root_state
->fluids
;
75 old_length
= SCM_LENGTH (old_fluids
);
76 new_fluids
= scm_make_vector (SCM_MAKINUM (new_length
), SCM_BOOL_F
);
78 while (i
< old_length
)
80 SCM_VELTS(new_fluids
)[i
] = SCM_VELTS(old_fluids
)[i
];
83 while (i
< new_length
)
85 SCM_VELTS(new_fluids
)[i
] = SCM_BOOL_F
;
89 root_state
->fluids
= new_fluids
;
93 scm_copy_fluids (scm_root_state
*root_state
)
95 grow_fluids (root_state
, SCM_LENGTH(root_state
->fluids
));
99 print_fluid (SCM exp
, SCM port
, scm_print_state
*pstate
)
101 scm_puts ("#<fluid ", port
);
102 scm_intprint (SCM_FLUID_NUM (exp
), 10, port
);
103 scm_putc ('>', port
);
108 int next_fluid_num ()
112 SCM_THREAD_CRITICAL_SECTION_START
;
116 SCM_THREAD_CRITICAL_SECTION_END
;
121 SCM_DEFINE (scm_make_fluid
, "make-fluid", 0, 0, 0,
124 #define FUNC_NAME s_scm_make_fluid
129 n
= next_fluid_num ();
130 SCM_RETURN_NEWSMOB (scm_tc16_fluid
, n
);
134 SCM_DEFINE (scm_fluid_p
, "fluid?", 1, 0, 0,
137 #define FUNC_NAME s_scm_fluid_p
139 return SCM_BOOL(SCM_FLUIDP (fl
));
143 SCM_DEFINE (scm_fluid_ref
, "fluid-ref", 1, 0, 0,
146 #define FUNC_NAME s_scm_fluid_ref
150 SCM_VALIDATE_FLUID (1,fl
);
152 n
= SCM_FLUID_NUM (fl
);
154 if (SCM_LENGTH (scm_root
->fluids
) <= n
)
155 grow_fluids (scm_root
, n
+1);
156 return SCM_VELTS(scm_root
->fluids
)[n
];
160 SCM_DEFINE (scm_fluid_set_x
, "fluid-set!", 2, 0, 0,
163 #define FUNC_NAME s_scm_fluid_set_x
167 SCM_VALIDATE_FLUID (1,fl
);
168 n
= SCM_FLUID_NUM (fl
);
170 if (SCM_LENGTH (scm_root
->fluids
) <= n
)
171 grow_fluids (scm_root
, n
+1);
172 SCM_VELTS(scm_root
->fluids
)[n
] = val
;
178 scm_swap_fluids (SCM fluids
, SCM vals
)
180 while (SCM_NIMP (fluids
))
182 SCM fl
= SCM_CAR (fluids
);
183 SCM old_val
= scm_fluid_ref (fl
);
184 scm_fluid_set_x (fl
, SCM_CAR (vals
));
185 SCM_SETCAR (vals
, old_val
);
186 fluids
= SCM_CDR (fluids
);
187 vals
= SCM_CDR (vals
);
191 /* Swap the fluid values in reverse order. This is important when the
192 same fluid appears multiple times in the fluids list. */
195 scm_swap_fluids_reverse (SCM fluids
, SCM vals
)
197 if (SCM_NIMP (fluids
))
201 scm_swap_fluids_reverse (SCM_CDR (fluids
), SCM_CDR (vals
));
202 fl
= SCM_CAR (fluids
);
203 old_val
= scm_fluid_ref (fl
);
204 scm_fluid_set_x (fl
, SCM_CAR (vals
));
205 SCM_SETCAR (vals
, old_val
);
211 apply_thunk (void *thunk
)
213 return scm_apply ((SCM
) thunk
, SCM_EOL
, SCM_EOL
);
216 SCM_DEFINE (scm_with_fluids
, "with-fluids*", 3, 0, 0,
217 (SCM fluids
, SCM vals
, SCM thunk
),
219 #define FUNC_NAME s_scm_with_fluids
221 return scm_internal_with_fluids (fluids
, vals
, apply_thunk
, (void *)thunk
);
226 scm_internal_with_fluids (SCM fluids
, SCM vals
, SCM (*cproc
) (), void *cdata
)
227 #define FUNC_NAME "scm_internal_with_fluids"
232 SCM_VALIDATE_LIST_COPYLEN (1, fluids
, flen
);
233 SCM_VALIDATE_LIST_COPYLEN (2, vals
, vlen
);
235 scm_out_of_range (s_scm_with_fluids
, vals
);
237 scm_swap_fluids (fluids
, vals
);
238 scm_dynwinds
= scm_acons (fluids
, vals
, scm_dynwinds
);
240 scm_dynwinds
= SCM_CDR (scm_dynwinds
);
241 scm_swap_fluids_reverse (fluids
, vals
);
251 scm_tc16_fluid
= scm_make_smob_type_mfpe ("fluid", 0,
252 NULL
, NULL
, print_fluid
, NULL
);