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31bc6de3 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 2000 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 | ||
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47 | /* This file does some pretty hairy #inclusion. It probably seemed |
48 | like a good idea at the time, but it doesn't now. Here's the | |
49 | structure, edited for relevance (!), last I checked: | |
50 | ||
51 | threads.c: | |
52 | threads.h | |
53 | coop-defs.h | |
54 | iselect.h | |
55 | mit-pthreads.c | |
56 | coop-threads.c | |
57 | coop-threads.h | |
58 | coop-defs.h* | |
59 | ../qt/qt.h | |
60 | coop.c | |
61 | <qt.h> | |
62 | ||
055e7d64 | 63 | * second #inclusion |
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64 | */ |
65 | ||
7bfd3b9e | 66 | #include <stdio.h> |
a0599745 MD |
67 | #include "libguile/_scm.h" |
68 | #include "libguile/dynwind.h" | |
69 | #include "libguile/smob.h" | |
7bfd3b9e | 70 | |
a0599745 | 71 | #include "libguile/threads.h" |
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72 | |
73 | \f | |
74 | ||
75 | long scm_tc16_thread; | |
76 | ||
77 | long scm_tc16_mutex; | |
78 | ||
79 | long scm_tc16_condvar; | |
80 | ||
81 | \f | |
82 | /* Scheme-visible thread functions. */ | |
83 | ||
84 | #ifdef USE_COOP_THREADS | |
1bbd0b84 | 85 | SCM_REGISTER_PROC(s_single_thread_p, "single-active-thread?", 0, 0, 0, scm_single_thread_p); |
7bfd3b9e | 86 | #endif |
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87 | |
88 | /* GJB:FIXME:DOC: SCM_REGISTER_PROC needs to permit a docstring, | |
89 | or these need to move into the file where the proc is defined. */ | |
90 | ||
1bbd0b84 | 91 | SCM_REGISTER_PROC(s_yield, "yield", 0, 0, 0, scm_yield); |
4079f87e GB |
92 | /* If one or more threads are waiting to execute, calling yield forces an |
93 | immediate context switch to one of them. Otherwise, yield has no effect. | |
94 | */ | |
95 | ||
1bbd0b84 | 96 | SCM_REGISTER_PROC(s_call_with_new_thread, "call-with-new-thread", 0, 0, 1, scm_call_with_new_thread); |
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97 | /* Evaluate @var{(thunk)} in a new thread, and new dynamic context, |
98 | returning a new thread object representing the thread. | |
99 | ||
100 | If an error occurs during evaluation, call error-thunk, passing it an | |
101 | error code describing the condition. [Error codes are currently | |
102 | meaningless integers. In the future, real values will be specified.] | |
103 | If this happens, the error-thunk is called outside the scope of the new | |
104 | root -- it is called in the same dynamic context in which | |
105 | with-new-thread was evaluated, but not in the callers thread. | |
106 | ||
107 | All the evaluation rules for dynamic roots apply to threads. | |
108 | */ | |
109 | ||
1bbd0b84 | 110 | SCM_REGISTER_PROC(s_join_thread, "join-thread", 1, 0, 0, scm_join_thread); |
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111 | /* Suspend execution of the calling thread until the target @var{thread} |
112 | terminates, unless the target @var{thread} has already terminated. | |
113 | */ | |
114 | ||
1bbd0b84 | 115 | SCM_REGISTER_PROC(s_make_mutex, "make-mutex", 0, 0, 0, scm_make_mutex); |
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116 | /* Create a new mutex object. */ |
117 | ||
1bbd0b84 | 118 | SCM_REGISTER_PROC(s_lock_mutex, "lock-mutex", 1, 0, 0, scm_lock_mutex); |
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119 | /* Lock @var{mutex}. If the mutex is already locked, the calling thread |
120 | blocks until the mutex becomes available. The function returns when | |
121 | the calling thread owns the lock on @var{mutex}. */ | |
122 | ||
1bbd0b84 | 123 | SCM_REGISTER_PROC(s_unlock_mutex, "unlock-mutex", 1, 0, 0, scm_unlock_mutex); |
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124 | /* Unlocks @var{mutex} if the calling thread owns the lock on @var{mutex}. |
125 | Calling unlock-mutex on a mutex not owned by the current thread results | |
126 | in undefined behaviour. Once a mutex has been unlocked, one thread | |
127 | blocked on @var{mutex} is awakened and grabs the mutex lock. */ | |
128 | ||
1bbd0b84 | 129 | SCM_REGISTER_PROC(s_make_condition_variable, "make-condition-variable", 0, 0, 0, scm_make_condition_variable); |
4079f87e | 130 | |
1bbd0b84 | 131 | SCM_REGISTER_PROC(s_wait_condition_variable, "wait-condition-variable", 2, 0, 0, scm_wait_condition_variable); |
4079f87e | 132 | |
1bbd0b84 | 133 | SCM_REGISTER_PROC(s_signal_condition_variable, "signal-condition-variable", 1, 0, 0, scm_signal_condition_variable); |
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134 | |
135 | \f | |
136 | ||
137 | #ifdef USE_MIT_PTHREADS | |
138 | #include "mit-pthreads.c" | |
139 | #endif | |
140 | ||
141 | #ifdef USE_COOP_THREADS | |
a0599745 | 142 | #include "libguile/coop-threads.c" |
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143 | #endif |
144 | ||
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145 | \f |
146 | ||
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147 | void |
148 | scm_init_threads (SCM_STACKITEM *i) | |
7bfd3b9e | 149 | { |
31bc6de3 | 150 | scm_tc16_thread = scm_make_smob_type ("thread", 0); |
23a62151 MD |
151 | scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (coop_m)); |
152 | scm_tc16_condvar = scm_make_smob_type ("condition-variable", sizeof (coop_c)); | |
153 | ||
a0599745 | 154 | #include "libguile/threads.x" |
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155 | /* Initialize implementation specific details of the threads support */ |
156 | scm_threads_init (i); | |
157 | } | |
89e00824 ML |
158 | |
159 | /* | |
160 | Local Variables: | |
161 | c-file-style: "gnu" | |
162 | End: | |
163 | */ |