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1 | /* Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | * | |
17 | * As a special exception, the Free Software Foundation gives permission | |
18 | * for additional uses of the text contained in its release of GUILE. | |
19 | * | |
20 | * The exception is that, if you link the GUILE library with other files | |
21 | * to produce an executable, this does not by itself cause the | |
22 | * resulting executable to be covered by the GNU General Public License. | |
23 | * Your use of that executable is in no way restricted on account of | |
24 | * linking the GUILE library code into it. | |
25 | * | |
26 | * This exception does not however invalidate any other reasons why | |
27 | * the executable file might be covered by the GNU General Public License. | |
28 | * | |
29 | * This exception applies only to the code released by the | |
30 | * Free Software Foundation under the name GUILE. If you copy | |
31 | * code from other Free Software Foundation releases into a copy of | |
32 | * GUILE, as the General Public License permits, the exception does | |
33 | * not apply to the code that you add in this way. To avoid misleading | |
34 | * anyone as to the status of such modified files, you must delete | |
35 | * this exception notice from them. | |
36 | * | |
37 | * If you write modifications of your own for GUILE, it is your choice | |
38 | * whether to permit this exception to apply to your modifications. | |
39 | * If you do not wish that, delete this exception notice. | |
40 | */ | |
41 | \f | |
42 | ||
43 | #include <stdio.h> | |
44 | #include "_scm.h" | |
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45 | #include "smob.h" |
46 | ||
47 | #include "arbiters.h" | |
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48 | |
49 | \f | |
50 | /* {Arbiters} | |
51 | * | |
52 | * These procedures implement synchronization primitives. Processors | |
53 | * with an atomic test-and-set instruction can use it here (and not | |
54 | * SCM_DEFER_INTS). | |
55 | */ | |
56 | ||
57 | static long scm_tc16_arbiter; | |
58 | ||
1cc91f1b | 59 | |
0f2d19dd | 60 | static int |
9882ea19 | 61 | prinarb (exp, port, pstate) |
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62 | SCM exp; |
63 | SCM port; | |
9882ea19 | 64 | scm_print_state *pstate; |
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65 | { |
66 | scm_gen_puts (scm_regular_string, "#<arbiter ", port); | |
67 | if (SCM_CAR (exp) & (1L << 16)) | |
68 | scm_gen_puts (scm_regular_string, "locked ", port); | |
9882ea19 | 69 | scm_iprin1 (SCM_CDR (exp), port, pstate); |
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70 | scm_gen_putc ('>', port); |
71 | return !0; | |
72 | } | |
73 | ||
74 | static scm_smobfuns arbsmob = | |
75 | { | |
76 | scm_markcdr, scm_free0, prinarb, 0 | |
77 | }; | |
78 | ||
79 | SCM_PROC(s_make_arbiter, "make-arbiter", 1, 0, 0, scm_make_arbiter); | |
1cc91f1b | 80 | |
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81 | SCM |
82 | scm_make_arbiter (name) | |
83 | SCM name; | |
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84 | { |
85 | register SCM z; | |
86 | SCM_NEWCELL (z); | |
87 | SCM_CDR (z) = name; | |
88 | SCM_CAR (z) = scm_tc16_arbiter; | |
89 | return z; | |
90 | } | |
91 | ||
92 | SCM_PROC(s_try_arbiter, "try-arbiter", 1, 0, 0, scm_try_arbiter); | |
1cc91f1b | 93 | |
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94 | SCM |
95 | scm_try_arbiter (arb) | |
96 | SCM arb; | |
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97 | { |
98 | SCM_ASSERT ((SCM_TYP16 (arb) == scm_tc16_arbiter), arb, SCM_ARG1, s_try_arbiter); | |
99 | SCM_DEFER_INTS; | |
100 | if (SCM_CAR (arb) & (1L << 16)) | |
101 | arb = SCM_BOOL_F; | |
102 | else | |
103 | { | |
104 | SCM_CAR (arb) = scm_tc16_arbiter | (1L << 16); | |
105 | arb = SCM_BOOL_T; | |
106 | } | |
107 | SCM_ALLOW_INTS; | |
108 | return arb; | |
109 | } | |
110 | ||
111 | ||
112 | SCM_PROC(s_release_arbiter, "release-arbiter", 1, 0, 0, scm_release_arbiter); | |
1cc91f1b | 113 | |
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114 | SCM |
115 | scm_release_arbiter (arb) | |
116 | SCM arb; | |
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117 | { |
118 | SCM_ASSERT ((SCM_TYP16 (arb) == scm_tc16_arbiter), arb, SCM_ARG1, s_release_arbiter); | |
119 | if (!(SCM_CAR (arb) & (1L << 16))) | |
120 | return SCM_BOOL_F; | |
121 | SCM_CAR (arb) = scm_tc16_arbiter; | |
122 | return SCM_BOOL_T; | |
123 | } | |
124 | ||
125 | ||
1cc91f1b | 126 | |
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127 | void |
128 | scm_init_arbiters () | |
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129 | { |
130 | scm_tc16_arbiter = scm_newsmob (&arbsmob); | |
131 | #include "arbiters.x" | |
132 | } | |
133 |