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1 | /* classes: h_files */ |
2 | ||
d0350293 MV |
3 | #ifndef SCM_NULL_THREADS_H |
4 | #define SCM_NULL_THREADS_H | |
3d527b27 MV |
5 | |
6 | /* Copyright (C) 2002 Free Software Foundation, Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this software; see the file COPYING. If not, write to | |
20 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
21 | * Boston, MA 02111-1307 USA | |
22 | * | |
23 | * As a special exception, the Free Software Foundation gives permission | |
24 | * for additional uses of the text contained in its release of GUILE. | |
25 | * | |
26 | * The exception is that, if you link the GUILE library with other files | |
27 | * to produce an executable, this does not by itself cause the | |
28 | * resulting executable to be covered by the GNU General Public License. | |
29 | * Your use of that executable is in no way restricted on account of | |
30 | * linking the GUILE library code into it. | |
31 | * | |
32 | * This exception does not however invalidate any other reasons why | |
33 | * the executable file might be covered by the GNU General Public License. | |
34 | * | |
35 | * This exception applies only to the code released by the | |
36 | * Free Software Foundation under the name GUILE. If you copy | |
37 | * code from other Free Software Foundation releases into a copy of | |
38 | * GUILE, as the General Public License permits, the exception does | |
39 | * not apply to the code that you add in this way. To avoid misleading | |
40 | * anyone as to the status of such modified files, you must delete | |
41 | * this exception notice from them. | |
42 | * | |
43 | * If you write modifications of your own for GUILE, it is your choice | |
44 | * whether to permit this exception to apply to your modifications. | |
45 | * If you do not wish that, delete this exception notice. */ | |
46 | ||
47 | \f | |
48 | ||
49 | /* The null-threads implementation. We provide the standard API, but | |
50 | no new threads can be created. | |
51 | */ | |
52 | ||
d0350293 MV |
53 | /* We can't switch so don't bother trying. |
54 | */ | |
55 | #undef SCM_THREAD_SWITCHING_CODE | |
3d527b27 MV |
56 | #define SCM_THREAD_SWITCHING_CODE |
57 | ||
d0350293 MV |
58 | #define scm_t_thread int |
59 | ||
60 | /* The "(void)(...)" constructs in the expansions are there to ensure | |
61 | that the side effects of the argument expressions take place. | |
62 | */ | |
63 | ||
64 | #define scm_thread_create(th,proc,data) ((void)(proc), (void)(data), ENOTSUP) | |
65 | #define scm_thread_join(th) do { (void)(th); abort(); } while(0) | |
66 | #define scm_thread_detach(th) do { (void)(th); abort(); } while(0) | |
67 | #define scm_thread_self() 0 | |
68 | ||
69 | #define scm_t_mutex int | |
70 | ||
71 | #define scm_mutex_init(mx) do { (void)(mx); } while(0) | |
72 | #define scm_mutex_destroy(mx) do { (void)(mx); } while(0) | |
73 | #define scm_mutex_lock(mx) do { (void)(mx); } while(0) | |
74 | #define scm_mutex_trylock(mx) ((void)(mx), 1) | |
75 | #define scm_mutex_unlock(mx) do { (void)(mx); } while(0) | |
76 | ||
77 | #define scm_t_cond int | |
78 | ||
79 | #define scm_cond_init(cv) do { (void)(cv); } while(0) | |
80 | #define scm_cond_destroy(cv) do { (void)(cv); } while(0) | |
81 | #define scm_cond_wait(cv,mx) ((void)(cv), (void)(mx), ENOTSUP) | |
82 | #define scm_cond_timedwait(cv,mx,at) ((void)(cv), (void)(mx), (void)(at), \ | |
83 | ENOTSUP) | |
84 | #define scm_cond_signal(cv) do { (void)(cv); } while(0) | |
85 | #define scm_cond_broadcast(cv) do { (void)(cv); } while(0) | |
86 | ||
87 | #define scm_thread_select select | |
88 | ||
89 | typedef void **scm_t_key; | |
90 | ||
91 | #define scm_key_create(keyp) do { *(keyp) = malloc(sizeof(void*)); \ | |
92 | } while(0) | |
93 | #define scm_key_delete(key) do { free(key); } while(0) | |
94 | #define scm_key_setspecific(key, value) do { *(key) = (value); } while(0) | |
95 | #define scm_key_getspecific(key) *(key) | |
96 | ||
97 | #if 0 | |
98 | ||
99 | /* These are the actual prototypes of the functions/macros defined | |
100 | above. We list them here for reference. */ | |
101 | ||
102 | typedef int scm_t_thread; | |
103 | ||
104 | SCM_API int scm_thread_create (scm_t_thread *th, | |
105 | void (*proc) (void *), void *data); | |
106 | SCM_API void scm_thread_join (scm_t_thread th); | |
107 | SCM_API void scm_thread_detach (scm_t_thread th); | |
108 | SCM_API scm_t_thread scm_thread_self (void); | |
109 | ||
110 | typedef int scm_t_mutex; | |
111 | ||
112 | SCM_API void scm_mutex_init (scm_t_mutex *mx); | |
113 | SCM_API void scm_mutex_destroy (scm_t_mutex *mx); | |
114 | SCM_API void scm_mutex_lock (scm_t_mutex *mx); | |
115 | SCM_API int scm_mutex_trylock (scm_t_mutex *mx); | |
116 | SCM_API void scm_mutex_unlock (scm_t_mutex *mx); | |
117 | ||
118 | typedef int scm_t_cond; | |
119 | ||
120 | SCM_API void scm_cond_init (scm_t_cond *cv); | |
121 | SCM_API void scm_cond_destroy (scm_t_cond *cv); | |
122 | SCM_API void scm_cond_wait (scm_t_cond *cv, scm_t_mutex *mx); | |
123 | SCM_API int scm_cond_timedwait (scm_t_cond *cv, scm_t_mutex *mx, | |
124 | struct timespec *abstime); | |
125 | SCM_API void scm_cond_signal (scm_t_cond *cv); | |
126 | SCM_API void scm_cond_broadcast (scm_t_cond *cv); | |
127 | ||
128 | typedef int scm_t_key; | |
129 | ||
130 | SCM_API void scm_key_create (scm_t_key *keyp); | |
131 | SCM_API void scm_key_delete (scm_t_key key); | |
132 | SCM_API void scm_key_setspecific (scm_t_key key, const void *value); | |
133 | SCM_API void *scm_key_getspecific (scm_t_key key); | |
134 | ||
135 | SCM_API int scm_thread_select (int nfds, | |
136 | SELECT_TYPE *readfds, | |
137 | SELECT_TYPE *writefds, | |
138 | SELECT_TYPE *exceptfds, | |
139 | struct timeval *timeout); | |
3d527b27 | 140 | |
d0350293 | 141 | #endif |
3d527b27 | 142 | |
d0350293 | 143 | #endif /* SCM_NULL_THREADS_H */ |
3d527b27 MV |
144 | |
145 | /* | |
146 | Local Variables: | |
147 | c-file-style: "gnu" | |
148 | End: | |
149 | */ |