Commit | Line | Data |
---|---|---|
7bfd3b9e JB |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef COOP_DEFSH | |
4 | #define COOP_DEFSH | |
5 | ||
216eedfc | 6 | /* Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
7bfd3b9e JB |
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 | |
82892bed JB |
20 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
21 | * Boston, MA 02111-1307 USA | |
7bfd3b9e JB |
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. | |
82892bed | 45 | * If you do not wish that, delete this exception notice. */ |
d3a6bc94 GB |
46 | |
47 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
48 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
7bfd3b9e JB |
49 | \f |
50 | ||
51 | # ifdef TIME_WITH_SYS_TIME | |
52 | # include <sys/time.h> | |
53 | # include <time.h> | |
54 | # else | |
55 | # ifdef HAVE_SYS_TIME_H | |
56 | # include <sys/time.h> | |
57 | # else | |
58 | # ifdef HAVE_TIME_H | |
59 | # include <time.h> | |
60 | # endif | |
61 | # endif | |
62 | # endif | |
63 | ||
44e8413c | 64 | #ifdef GUILE_ISELECT |
a0599745 | 65 | #include "libguile/iselect.h" |
44e8413c MD |
66 | #endif |
67 | ||
32e738bb MD |
68 | #ifdef GUILE_PTHREAD_COMPAT |
69 | #include <pthread.h> | |
70 | #endif | |
71 | ||
7bfd3b9e JB |
72 | /* This file is included by threads.h, which, in turn, is included by |
73 | libguile.h while coop-threads.h only is included by | |
74 | coop-threads.c. */ | |
75 | ||
76 | /* The coop_t struct must be declared here, since macros in this file | |
77 | refer to the data member. */ | |
78 | ||
79 | /* The notion of a thread is merged with the notion of a queue. | |
80 | Thread stuff: thread status (sp) and stuff to use during | |
81 | (re)initialization. Queue stuff: next thread in the queue | |
82 | (next). */ | |
83 | ||
84 | struct qt_t; | |
85 | ||
86 | typedef struct coop_t { | |
87 | struct qt_t *sp; /* QuickThreads handle. */ | |
88 | void *sto; /* `malloc'-allocated stack. */ | |
89 | ||
90 | struct coop_t *next; /* Next thread in the queue. */ | |
91 | ||
92 | struct coop_t *all_next; | |
93 | struct coop_t *all_prev; | |
94 | ||
95 | void *data; /* Thread local data */ | |
32e738bb MD |
96 | void **specific; /* Data associated with keys */ |
97 | int n_keys; /* Upper limit for keys on this thread */ | |
7bfd3b9e JB |
98 | |
99 | void *base; /* Base of stack */ | |
100 | void *top; /* Top of stack */ | |
101 | ||
102 | void *joining; /* A queue of threads waiting to join this | |
103 | thread */ | |
104 | ||
44e8413c MD |
105 | #ifdef GUILE_ISELECT |
106 | int nfds; | |
107 | SELECT_TYPE *readfds; | |
108 | SELECT_TYPE *writefds; | |
109 | SELECT_TYPE *exceptfds; | |
110 | int timeoutp; | |
111 | struct timeval wakeup_time; /* Time to stop sleeping */ | |
c44bfbc9 | 112 | int _errno; |
44e8413c MD |
113 | int retval; |
114 | #else | |
7bfd3b9e | 115 | time_t wakeup_time; /* Time to stop sleeping */ |
44e8413c | 116 | #endif |
7bfd3b9e | 117 | |
32e738bb MD |
118 | #ifdef GUILE_PTHREAD_COMPAT |
119 | pthread_t dummy_thread; | |
120 | pthread_mutex_t dummy_mutex; | |
32e738bb | 121 | #endif |
7bfd3b9e JB |
122 | } coop_t; |
123 | ||
c8bf4ecd MD |
124 | /* A queue is a circular list of threads. The queue head is a |
125 | designated list element. If this is a uniprocessor-only | |
126 | implementation we can store the `main' thread in this, but in a | |
127 | multiprocessor there are several `heavy' threads but only one run | |
128 | queue. A fancier implementation might have private run queues, | |
129 | which would lead to a simpler (trivial) implementation */ | |
130 | ||
131 | typedef struct coop_q_t { | |
132 | coop_t t; | |
133 | coop_t *tail; | |
134 | } coop_q_t; | |
135 | ||
136 | /* A Mutex variable is made up of a owner thread, and a queue of threads | |
137 | waiting on the mutex */ | |
138 | ||
139 | typedef struct coop_m { | |
140 | coop_t *owner; /* Mutex owner */ | |
141 | coop_q_t waiting; /* Queue of waiting threads */ | |
142 | } coop_m; | |
143 | ||
32e738bb MD |
144 | typedef int coop_mattr; |
145 | ||
c8bf4ecd MD |
146 | typedef coop_m scm_mutex_t; |
147 | ||
148 | extern int coop_mutex_init (coop_m*); | |
32e738bb | 149 | extern int coop_new_mutex_init (coop_m*, coop_mattr*); |
c8bf4ecd | 150 | extern int coop_mutex_lock (coop_m*); |
32e738bb | 151 | extern int coop_mutex_trylock (coop_m*); |
c8bf4ecd MD |
152 | extern int coop_mutex_unlock (coop_m*); |
153 | extern int coop_mutex_destroy (coop_m*); | |
b74b1a63 | 154 | #define scm_mutex_init coop_mutex_init |
c8bf4ecd | 155 | #define scm_mutex_lock coop_mutex_lock |
32e738bb | 156 | #define scm_mutex_trylock coop_mutex_lock |
c8bf4ecd MD |
157 | #define scm_mutex_unlock coop_mutex_unlock |
158 | #define scm_mutex_destroy coop_mutex_destroy | |
159 | ||
160 | /* A Condition variable is made up of a list of threads waiting on the | |
161 | condition. */ | |
162 | ||
163 | typedef struct coop_c { | |
164 | coop_q_t waiting; /* Queue of waiting threads */ | |
165 | } coop_c; | |
166 | ||
32e738bb MD |
167 | typedef int coop_cattr; |
168 | ||
c8bf4ecd MD |
169 | typedef coop_c scm_cond_t; |
170 | ||
14d2005d MD |
171 | #ifndef HAVE_STRUCT_TIMESPEC |
172 | /* POSIX.4 structure for a time value. This is like a `struct timeval' but | |
173 | has nanoseconds instead of microseconds. */ | |
174 | struct timespec | |
175 | { | |
176 | long int tv_sec; /* Seconds. */ | |
177 | long int tv_nsec; /* Nanoseconds. */ | |
178 | }; | |
179 | #endif | |
180 | ||
c8bf4ecd | 181 | extern int coop_condition_variable_init (coop_c*); |
32e738bb | 182 | extern int coop_new_condition_variable_init (coop_c*, coop_cattr*); |
c8bf4ecd | 183 | extern int coop_condition_variable_wait_mutex (coop_c*, coop_m*); |
32e738bb MD |
184 | extern int coop_condition_variable_timed_wait_mutex (coop_c*, |
185 | coop_m*, | |
186 | const struct timespec *abstime); | |
c8bf4ecd MD |
187 | extern int coop_condition_variable_signal (coop_c*); |
188 | extern int coop_condition_variable_destroy (coop_c*); | |
32e738bb | 189 | #define scm_cond_init coop_new_condition_variable_init |
c8bf4ecd | 190 | #define scm_cond_wait coop_condition_variable_wait_mutex |
32e738bb | 191 | #define scm_cond_timedwait coop_condition_variable_timed_wait_mutex |
c8bf4ecd | 192 | #define scm_cond_signal coop_condition_variable_signal |
32e738bb | 193 | #define scm_cond_broadcast coop_condition_variable_signal /* yes */ |
c8bf4ecd MD |
194 | #define scm_cond_destroy coop_condition_variable_destroy |
195 | ||
32e738bb MD |
196 | typedef int coop_k; |
197 | ||
198 | typedef coop_k scm_key_t; | |
199 | ||
817e55b9 | 200 | extern int coop_key_create (coop_k *keyp, void (*destruktor) (void *value)); |
32e738bb MD |
201 | extern int coop_setspecific (coop_k key, const void *value); |
202 | extern void *coop_getspecific (coop_k key); | |
203 | extern int coop_key_delete (coop_k); | |
204 | #define scm_key_create coop_key_create | |
205 | #define scm_setspecific coop_setspecific | |
206 | #define scm_getspecific coop_getspecific | |
207 | #define scm_key_delete coop_key_delete | |
208 | ||
7bfd3b9e JB |
209 | extern coop_t *coop_global_curr; /* Currently-executing thread. */ |
210 | ||
6d71500e | 211 | extern void coop_join (coop_t *t); |
7bfd3b9e JB |
212 | extern void coop_yield (void); |
213 | ||
214 | extern size_t scm_switch_counter; | |
215 | extern size_t scm_thread_count; | |
216 | ||
217 | \f | |
6d71500e JB |
218 | /* Some iselect functions. */ |
219 | ||
220 | /* I'm not sure whether these three declarations should be here. | |
221 | They're really defined in iselect.c, so you'd think they'd go in | |
222 | iselect.h, but they use coop_t, defined above, which uses things | |
223 | defined in iselect.h. Basically, we're making at best a flailing | |
224 | (and failing) attempt at modularity here, and I don't have time to | |
225 | rethink this at the moment. This code awaits a Hero. --JimB */ | |
32e738bb MD |
226 | #ifdef GUILE_ISELECT |
227 | void coop_timeout_qinsert (coop_q_t *, coop_t *); | |
228 | #endif | |
6d71500e JB |
229 | extern coop_t *coop_next_runnable_thread (void); |
230 | extern coop_t *coop_wait_for_runnable_thread_now (struct timeval *); | |
231 | extern coop_t *coop_wait_for_runnable_thread (void); | |
232 | ||
233 | ||
234 | \f | |
7bfd3b9e JB |
235 | |
236 | /* Cooperative threads don't need to have these defined */ | |
237 | ||
216eedfc DH |
238 | #define SCM_CRITICAL_SECTION_START |
239 | #define SCM_CRITICAL_SECTION_END | |
7bfd3b9e JB |
240 | |
241 | \f | |
242 | ||
243 | #define SCM_NO_CRITICAL_SECTION_OWNER 0 | |
244 | #define SCM_THREAD_SWITCH_COUNT 50 /* was 10 /mdj */ | |
245 | ||
246 | \f | |
247 | ||
7bfd3b9e JB |
248 | #if 0 |
249 | #define SCM_THREAD_SWITCHING_CODE \ | |
d3a6bc94 | 250 | do { \ |
7bfd3b9e JB |
251 | if (scm_thread_count > 1) \ |
252 | coop_yield(); \ | |
d3a6bc94 | 253 | } while (0) |
7bfd3b9e JB |
254 | |
255 | #else | |
256 | #define SCM_THREAD_SWITCHING_CODE \ | |
d3a6bc94 | 257 | do { \ |
7bfd3b9e JB |
258 | if (scm_thread_count > 1) \ |
259 | { \ | |
260 | scm_switch_counter--; \ | |
261 | if (scm_switch_counter == 0) \ | |
262 | { \ | |
263 | scm_switch_counter = SCM_THREAD_SWITCH_COUNT; \ | |
264 | coop_yield(); \ | |
265 | } \ | |
266 | } \ | |
d3a6bc94 | 267 | } while (0) |
7bfd3b9e JB |
268 | |
269 | #endif | |
270 | ||
32e738bb MD |
271 | /* For pthreads, this is a value associated with a specific key. |
272 | * For coop, we use a special field for increased efficiency. | |
273 | */ | |
7bfd3b9e JB |
274 | #define SCM_THREAD_LOCAL_DATA (coop_global_curr->data) |
275 | #define SCM_SET_THREAD_LOCAL_DATA(ptr) (coop_global_curr->data = (ptr)) | |
276 | ||
277 | #endif /* COOP_DEFSH */ | |
89e00824 ML |
278 | |
279 | /* | |
280 | Local Variables: | |
281 | c-file-style: "gnu" | |
282 | End: | |
283 | */ |