Commit | Line | Data |
---|---|---|
9482a297 MV |
1 | /* Copyright (C) 1996 Free Software Foundation, Inc. |
2 | * | |
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) | |
6 | * any later version. | |
7 | * | |
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. | |
12 | * | |
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 | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
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. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
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. | |
37 | * | |
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. */ | |
41 | ||
42 | #include <assert.h> | |
43 | ||
44 | #include "_scm.h" | |
45 | #include "print.h" | |
46 | #include "smob.h" | |
47 | #include "fluids.h" | |
48 | ||
49 | #define INITIAL_FLUIDS 10 | |
50 | ||
51 | static volatile int n_fluids; | |
52 | long scm_tc16_fluid; | |
53 | ||
54 | SCM | |
55 | scm_make_initial_fluids () | |
56 | { | |
57 | return scm_make_vector (SCM_MAKINUM (INITIAL_FLUIDS), | |
58 | SCM_BOOL_F, SCM_BOOL_F); | |
59 | } | |
60 | ||
61 | static void grow_fluids SCM_P ((scm_root_state *, int new_length)); | |
62 | static void | |
63 | grow_fluids (root_state, new_length) | |
64 | scm_root_state *root_state; | |
65 | int new_length; | |
66 | { | |
67 | SCM old_fluids, new_fluids; | |
68 | int old_length, i; | |
69 | ||
70 | old_fluids = root_state->fluids; | |
71 | assert (SCM_NIMP (old_fluids) && SCM_VECTORP (old_fluids)); | |
72 | old_length = SCM_LENGTH (old_fluids); | |
73 | assert (old_length <= new_length); | |
74 | new_fluids = scm_make_vector (SCM_MAKINUM (new_length), | |
75 | SCM_BOOL_F, SCM_BOOL_F); | |
76 | i = 0; | |
77 | while (i < old_length) | |
78 | { | |
79 | SCM_VELTS(new_fluids)[i] = SCM_VELTS(old_fluids)[i]; | |
80 | i++; | |
81 | } | |
82 | while (i < new_length) | |
83 | { | |
84 | SCM_VELTS(new_fluids)[i] = SCM_BOOL_F; | |
85 | i++; | |
86 | } | |
87 | ||
88 | root_state->fluids = new_fluids; | |
89 | } | |
90 | ||
91 | void | |
92 | scm_copy_fluids (root_state) | |
93 | scm_root_state *root_state; | |
94 | { | |
95 | grow_fluids (root_state, SCM_LENGTH(root_state->fluids)); | |
96 | } | |
97 | ||
98 | static int print_fluid SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
99 | static int | |
100 | print_fluid (exp, port, pstate) | |
101 | SCM exp; | |
102 | SCM port; | |
103 | scm_print_state *pstate; | |
104 | { | |
105 | scm_gen_puts (scm_regular_string, "#<fluid ", port); | |
106 | scm_intprint (SCM_FLUID_NUM (exp), 10, port); | |
107 | scm_gen_putc ('>', port); | |
108 | return 1; | |
109 | } | |
110 | ||
111 | static scm_smobfuns fluid_smob = { | |
112 | scm_mark0, | |
113 | scm_free0, | |
114 | print_fluid | |
115 | }; | |
116 | ||
117 | static | |
118 | int next_fluid_num () | |
119 | { | |
120 | int n; | |
121 | SCM_THREAD_CRITICAL_SECTION_START; | |
122 | n = n_fluids++; | |
123 | SCM_THREAD_CRITICAL_SECTION_END; | |
124 | return n; | |
125 | } | |
126 | ||
127 | SCM_PROC (s_make_fluid, "make-fluid", 0, 0, 0, scm_make_fluid); | |
128 | ||
129 | SCM | |
130 | scm_make_fluid () | |
131 | { | |
132 | SCM z; | |
133 | int n; | |
134 | ||
135 | SCM_DEFER_INTS; | |
136 | n = next_fluid_num (); | |
137 | SCM_NEWCELL (z); | |
138 | SCM_SETCAR (z, scm_tc16_fluid); | |
139 | SCM_SETCDR (z, n); | |
140 | SCM_ALLOW_INTS; | |
141 | ||
142 | return z; | |
143 | } | |
144 | ||
145 | SCM_PROC (s_fluid_ref, "fluid-ref", 1, 0, 0, scm_fluid_ref); | |
146 | ||
147 | SCM | |
148 | scm_fluid_ref (fl) | |
149 | SCM fl; | |
150 | { | |
151 | int n; | |
152 | ||
153 | SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), SCM_ARG1, fl, s_fluid_ref); | |
154 | ||
155 | n = SCM_FLUID_NUM (fl); | |
156 | assert (n >= 0 && n < n_fluids); | |
157 | ||
158 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
159 | grow_fluids (scm_root, n+1); | |
160 | return SCM_VELTS(scm_root->fluids)[n]; | |
161 | } | |
162 | ||
163 | SCM_PROC (s_fluid_set_x, "fluid-set!", 2, 0, 0, scm_fluid_set_x); | |
164 | ||
165 | SCM | |
166 | scm_fluid_set_x (fl, val) | |
167 | SCM fl; | |
168 | SCM val; | |
169 | { | |
170 | int n; | |
171 | ||
172 | SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), SCM_ARG1, fl, s_fluid_set_x); | |
173 | ||
174 | n = SCM_FLUID_NUM (fl); | |
175 | assert (n >= 0 && n < n_fluids); | |
176 | ||
177 | if (SCM_LENGTH (scm_root->fluids) <= n) | |
178 | grow_fluids (scm_root, n+1); | |
179 | SCM_VELTS(scm_root->fluids)[n] = val; | |
180 | return val; | |
181 | } | |
182 | ||
183 | void | |
184 | scm_init_fluids () | |
185 | { | |
186 | scm_tc16_fluid = scm_newsmob(&fluid_smob); | |
187 | #include "fluids.x" | |
188 | } |