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b7f3516f | 1 | /* Copyright (C) 1995,1996, 1997 Free Software Foundation, Inc. |
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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 | |
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15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
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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. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
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41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
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45 | \f |
46 | ||
47 | #include <stdio.h> | |
48 | #include "_scm.h" | |
20e6290e | 49 | #include "smob.h" |
4801c311 | 50 | #include "genio.h" |
20e6290e | 51 | |
1bbd0b84 | 52 | #include "scm_validate.h" |
20e6290e | 53 | #include "arbiters.h" |
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54 | |
55 | \f | |
56 | /* {Arbiters} | |
57 | * | |
58 | * These procedures implement synchronization primitives. Processors | |
59 | * with an atomic test-and-set instruction can use it here (and not | |
60 | * SCM_DEFER_INTS). | |
61 | */ | |
62 | ||
63 | static long scm_tc16_arbiter; | |
64 | ||
1cc91f1b | 65 | |
0f2d19dd | 66 | static int |
1bbd0b84 | 67 | prinarb (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 68 | { |
b7f3516f | 69 | scm_puts ("#<arbiter ", port); |
0f2d19dd | 70 | if (SCM_CAR (exp) & (1L << 16)) |
b7f3516f | 71 | scm_puts ("locked ", port); |
9882ea19 | 72 | scm_iprin1 (SCM_CDR (exp), port, pstate); |
b7f3516f | 73 | scm_putc ('>', port); |
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74 | return !0; |
75 | } | |
76 | ||
a1ec6916 | 77 | SCM_DEFINE(scm_make_arbiter, "make-arbiter", 1, 0, 0, |
1bbd0b84 GB |
78 | (SCM name), |
79 | "") | |
80 | #define FUNC_NAME s_scm_make_arbiter | |
0f2d19dd | 81 | { |
23a62151 | 82 | SCM_RETURN_NEWSMOB (scm_tc16_arbiter, name); |
0f2d19dd | 83 | } |
1bbd0b84 | 84 | #undef FUNC_NAME |
0f2d19dd | 85 | |
a1ec6916 | 86 | SCM_DEFINE(scm_try_arbiter, "try-arbiter", 1, 0, 0, |
1bbd0b84 GB |
87 | (SCM arb), |
88 | "") | |
89 | #define FUNC_NAME s_scm_try_arbiter | |
0f2d19dd | 90 | { |
1bbd0b84 | 91 | SCM_VALIDATE_SMOB(1,arb,arbiter); |
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92 | SCM_DEFER_INTS; |
93 | if (SCM_CAR (arb) & (1L << 16)) | |
94 | arb = SCM_BOOL_F; | |
95 | else | |
96 | { | |
a6c64c3c | 97 | SCM_SETCAR (arb, scm_tc16_arbiter | (1L << 16)); |
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98 | arb = SCM_BOOL_T; |
99 | } | |
100 | SCM_ALLOW_INTS; | |
101 | return arb; | |
102 | } | |
1bbd0b84 | 103 | #undef FUNC_NAME |
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104 | |
105 | ||
a1ec6916 | 106 | SCM_DEFINE(scm_release_arbiter, "release-arbiter", 1, 0, 0, |
1bbd0b84 GB |
107 | (SCM arb), |
108 | "") | |
109 | #define FUNC_NAME s_scm_release_arbiter | |
0f2d19dd | 110 | { |
1bbd0b84 | 111 | SCM_VALIDATE_SMOB(1,arb,arbiter); |
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112 | if (!(SCM_CAR (arb) & (1L << 16))) |
113 | return SCM_BOOL_F; | |
a6c64c3c | 114 | SCM_SETCAR (arb, scm_tc16_arbiter); |
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115 | return SCM_BOOL_T; |
116 | } | |
1bbd0b84 | 117 | #undef FUNC_NAME |
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118 | |
119 | ||
1cc91f1b | 120 | |
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121 | void |
122 | scm_init_arbiters () | |
0f2d19dd | 123 | { |
23a62151 MD |
124 | scm_tc16_arbiter = scm_make_smob_type_mfpe ("arbiter", 0, |
125 | scm_markcdr, NULL, prinarb, NULL); | |
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126 | #include "arbiters.x" |
127 | } |