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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Ondrej Palkovsky |
2 | * Copyright (c) 2006 Ondrej Palkovsky |
3 | * Copyright (c) 2007 Jakub Jermar |
3 | * Copyright (c) 2007 Jakub Jermar |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup libc |
30 | /** @addtogroup libc |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** @file |
33 | /** @file |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <libadt/list.h> |
36 | #include <libadt/list.h> |
37 | #include <fibril.h> |
37 | #include <fibril.h> |
38 | #include <malloc.h> |
38 | #include <malloc.h> |
39 | #include <unistd.h> |
39 | #include <unistd.h> |
40 | #include <thread.h> |
40 | #include <thread.h> |
41 | #include <stdio.h> |
41 | #include <stdio.h> |
42 | #include <libarch/faddr.h> |
42 | #include <libarch/faddr.h> |
43 | #include <futex.h> |
43 | #include <futex.h> |
44 | #include <assert.h> |
44 | #include <assert.h> |
45 | #include <async.h> |
45 | #include <async.h> |
46 | 46 | ||
47 | #ifndef FIBRIL_INITIAL_STACK_PAGES_NO |
47 | #ifndef FIBRIL_INITIAL_STACK_PAGES_NO |
48 | #define FIBRIL_INITIAL_STACK_PAGES_NO 1 |
48 | #define FIBRIL_INITIAL_STACK_PAGES_NO 1 |
49 | #endif |
49 | #endif |
50 | 50 | ||
- | 51 | /** This futex serializes access to ready_list, serialized_list and manage_list. |
|
- | 52 | */ |
|
- | 53 | static atomic_t fibril_futex = FUTEX_INITIALIZER; |
|
- | 54 | ||
51 | static LIST_INITIALIZE(ready_list); |
55 | static LIST_INITIALIZE(ready_list); |
52 | static LIST_INITIALIZE(serialized_list); |
56 | static LIST_INITIALIZE(serialized_list); |
53 | static LIST_INITIALIZE(manager_list); |
57 | static LIST_INITIALIZE(manager_list); |
54 | 58 | ||
55 | static void fibril_main(void); |
59 | static void fibril_main(void); |
56 | 60 | ||
57 | static atomic_t fibril_futex = FUTEX_INITIALIZER; |
- | |
58 | /** Number of threads that are in async_serialized mode */ |
61 | /** Number of fibrils that are in async_serialized mode */ |
59 | static int serialized_threads; /* Protected by async_futex */ |
62 | static int serialized_fibrils; /* Protected by async_futex */ |
60 | /** Thread-local count of serialization. If >0, we must not preempt */ |
63 | /** Thread-local count of serialization. If >0, we must not preempt */ |
61 | static __thread int serialization_count; |
64 | static __thread int serialization_count; |
62 | /** Counter for fibrils residing in async_manager */ |
65 | /** Counter for fibrils residing in async_manager */ |
63 | static int fibrils_in_manager; |
66 | static int fibrils_in_manager; |
64 | 67 | ||
65 | /** Setup fibril information into TCB structure */ |
68 | /** Setup fibril information into TCB structure */ |
66 | fibril_t *fibril_setup(void) |
69 | fibril_t *fibril_setup(void) |
67 | { |
70 | { |
68 | fibril_t *f; |
71 | fibril_t *f; |
69 | tcb_t *tcb; |
72 | tcb_t *tcb; |
70 | 73 | ||
71 | tcb = __make_tls(); |
74 | tcb = __make_tls(); |
72 | if (!tcb) |
75 | if (!tcb) |
73 | return NULL; |
76 | return NULL; |
74 | 77 | ||
75 | f = malloc(sizeof(*f)); |
78 | f = malloc(sizeof(*f)); |
76 | if (!f) { |
79 | if (!f) { |
77 | __free_tls(tcb); |
80 | __free_tls(tcb); |
78 | return NULL; |
81 | return NULL; |
79 | } |
82 | } |
80 | 83 | ||
81 | tcb->fibril_data = f; |
84 | tcb->fibril_data = f; |
82 | f->tcb = tcb; |
85 | f->tcb = tcb; |
83 | 86 | ||
84 | return f; |
87 | return f; |
85 | } |
88 | } |
86 | 89 | ||
87 | void fibril_teardown(fibril_t *f) |
90 | void fibril_teardown(fibril_t *f) |
88 | { |
91 | { |
89 | __free_tls(f->tcb); |
92 | __free_tls(f->tcb); |
90 | free(f); |
93 | free(f); |
91 | } |
94 | } |
92 | 95 | ||
93 | /** Function that spans the whole life-cycle of a fibril. |
96 | /** Function that spans the whole life-cycle of a fibril. |
94 | * |
97 | * |
95 | * Each fibril begins execution in this function. Then the function |
98 | * Each fibril begins execution in this function. Then the function implementing |
96 | * implementing the fibril logic is called. After its return, the return value |
99 | * the fibril logic is called. After its return, the return value is saved. |
97 | * is saved for a potentional joiner. If the joiner exists, it is woken up. The |
- | |
98 | * fibril then switches to another fibril, which cleans up after it. |
100 | * The fibril then switches to another fibril, which cleans up after it. |
99 | */ |
101 | */ |
100 | void fibril_main(void) |
102 | void fibril_main(void) |
101 | { |
103 | { |
102 | fibril_t *f = __tcb_get()->fibril_data; |
104 | fibril_t *f = __tcb_get()->fibril_data; |
103 | 105 | ||
- | 106 | /* Call the implementing function. */ |
|
104 | f->retval = f->func(f->arg); |
107 | f->retval = f->func(f->arg); |
105 | 108 | ||
106 | /* |
- | |
107 | * If there is a joiner, wake it up and save our return value. |
- | |
108 | */ |
- | |
109 | if (f->joiner) { |
- | |
110 | list_append(&f->joiner->link, &ready_list); |
- | |
111 | f->joiner->joinee_retval = f->retval; |
- | |
112 | } |
- | |
113 | - | ||
114 | fibril_schedule_next_adv(FIBRIL_FROM_DEAD); |
109 | fibril_schedule_next_adv(FIBRIL_FROM_DEAD); |
115 | /* not reached */ |
110 | /* not reached */ |
116 | } |
111 | } |
117 | 112 | ||
118 | /** Schedule next fibril. |
113 | /** Schedule next fibril. |
119 | * |
114 | * |
120 | * If calling with FIBRIL_TO_MANAGER parameter, the async_futex should be |
115 | * If calling with FIBRIL_TO_MANAGER parameter, the async_futex should be |
121 | * held. |
116 | * held. |
122 | * |
117 | * |
123 | * @param stype One of FIBRIL_SLEEP, FIBRIL_PREEMPT, FIBRIL_TO_MANAGER, |
118 | * @param stype Switch type. One of FIBRIL_PREEMPT, FIBRIL_TO_MANAGER, |
124 | * FIBRIL_FROM_MANAGER, FIBRIL_FROM_DEAD. The parameter |
119 | * FIBRIL_FROM_MANAGER, FIBRIL_FROM_DEAD. The parameter |
125 | * describes the circumstances of the switch. |
120 | * describes the circumstances of the switch. |
126 | * @return Return 0 if there is no ready fibril, |
121 | * @return Return 0 if there is no ready fibril, |
127 | * return 1 otherwise. |
122 | * return 1 otherwise. |
128 | */ |
123 | */ |
129 | int fibril_schedule_next_adv(fibril_switch_type_t stype) |
124 | int fibril_schedule_next_adv(fibril_switch_type_t stype) |
130 | { |
125 | { |
131 | fibril_t *srcf, *dstf; |
126 | fibril_t *srcf, *dstf; |
132 | int retval = 0; |
127 | int retval = 0; |
133 | 128 | ||
134 | futex_down(&fibril_futex); |
129 | futex_down(&fibril_futex); |
135 | 130 | ||
136 | if (stype == FIBRIL_PREEMPT && list_empty(&ready_list)) |
131 | if (stype == FIBRIL_PREEMPT && list_empty(&ready_list)) |
137 | goto ret_0; |
132 | goto ret_0; |
138 | if (stype == FIBRIL_SLEEP) { |
- | |
139 | if (list_empty(&ready_list) && list_empty(&serialized_list)) |
- | |
140 | goto ret_0; |
- | |
141 | } |
- | |
142 | 133 | ||
143 | if (stype == FIBRIL_FROM_MANAGER) { |
134 | if (stype == FIBRIL_FROM_MANAGER) { |
144 | if (list_empty(&ready_list) && list_empty(&serialized_list)) |
135 | if (list_empty(&ready_list) && list_empty(&serialized_list)) |
145 | goto ret_0; |
136 | goto ret_0; |
146 | /* |
137 | /* |
147 | * Do not preempt if there is not sufficient count of thread |
138 | * Do not preempt if there is not sufficient count of fibril |
148 | * managers. |
139 | * managers. |
149 | */ |
140 | */ |
150 | if (list_empty(&serialized_list) && fibrils_in_manager <= |
141 | if (list_empty(&serialized_list) && fibrils_in_manager <= |
151 | serialized_threads) { |
142 | serialized_fibrils) { |
152 | goto ret_0; |
143 | goto ret_0; |
153 | } |
144 | } |
154 | } |
145 | } |
155 | /* If we are going to manager and none exists, create it */ |
146 | /* If we are going to manager and none exists, create it */ |
156 | if (stype == FIBRIL_TO_MANAGER || stype == FIBRIL_FROM_DEAD) { |
147 | if (stype == FIBRIL_TO_MANAGER || stype == FIBRIL_FROM_DEAD) { |
157 | while (list_empty(&manager_list)) { |
148 | while (list_empty(&manager_list)) { |
158 | futex_up(&fibril_futex); |
149 | futex_up(&fibril_futex); |
159 | async_create_manager(); |
150 | async_create_manager(); |
160 | futex_down(&fibril_futex); |
151 | futex_down(&fibril_futex); |
161 | } |
152 | } |
162 | } |
153 | } |
163 | 154 | ||
164 | srcf = __tcb_get()->fibril_data; |
155 | srcf = __tcb_get()->fibril_data; |
165 | if (stype != FIBRIL_FROM_DEAD) { |
156 | if (stype != FIBRIL_FROM_DEAD) { |
166 | /* Save current state */ |
157 | /* Save current state */ |
167 | if (!context_save(&srcf->ctx)) { |
158 | if (!context_save(&srcf->ctx)) { |
168 | if (serialization_count) |
159 | if (serialization_count) |
169 | srcf->flags &= ~FIBRIL_SERIALIZED; |
160 | srcf->flags &= ~FIBRIL_SERIALIZED; |
170 | if (srcf->clean_after_me) { |
161 | if (srcf->clean_after_me) { |
171 | /* |
162 | /* |
172 | * Cleanup after the dead fibril from which we |
163 | * Cleanup after the dead fibril from which we |
173 | * restored context here. |
164 | * restored context here. |
174 | */ |
165 | */ |
175 | free(srcf->clean_after_me->stack); |
166 | free(srcf->clean_after_me->stack); |
176 | fibril_teardown(srcf->clean_after_me); |
167 | fibril_teardown(srcf->clean_after_me); |
177 | srcf->clean_after_me = NULL; |
168 | srcf->clean_after_me = NULL; |
178 | } |
169 | } |
179 | return 1; /* futex_up already done here */ |
170 | return 1; /* futex_up already done here */ |
180 | } |
171 | } |
181 | 172 | ||
182 | /* Save myself to the correct run list */ |
173 | /* Save myself to the correct run list */ |
183 | if (stype == FIBRIL_PREEMPT) |
174 | if (stype == FIBRIL_PREEMPT) |
184 | list_append(&srcf->link, &ready_list); |
175 | list_append(&srcf->link, &ready_list); |
185 | else if (stype == FIBRIL_FROM_MANAGER) { |
176 | else if (stype == FIBRIL_FROM_MANAGER) { |
186 | list_append(&srcf->link, &manager_list); |
177 | list_append(&srcf->link, &manager_list); |
187 | fibrils_in_manager--; |
178 | fibrils_in_manager--; |
188 | } else { |
179 | } else { |
189 | /* |
180 | /* |
190 | * If stype == FIBRIL_TO_MANAGER, don't put ourselves to |
181 | * If stype == FIBRIL_TO_MANAGER, don't put ourselves to |
191 | * any list, we should already be somewhere, or we will |
182 | * any list, we should already be somewhere, or we will |
192 | * be lost. |
183 | * be lost. |
193 | * |
- | |
194 | * The stype == FIBRIL_SLEEP case is similar. The fibril |
- | |
195 | * has an external refernce which can be used to wake it |
- | |
196 | * up once that time has come. |
- | |
197 | */ |
184 | */ |
198 | } |
185 | } |
199 | } |
186 | } |
200 | 187 | ||
201 | /* Choose a new fibril to run */ |
188 | /* Choose a new fibril to run */ |
202 | if (stype == FIBRIL_TO_MANAGER || stype == FIBRIL_FROM_DEAD) { |
189 | if (stype == FIBRIL_TO_MANAGER || stype == FIBRIL_FROM_DEAD) { |
203 | dstf = list_get_instance(manager_list.next, fibril_t, link); |
190 | dstf = list_get_instance(manager_list.next, fibril_t, link); |
204 | if (serialization_count && stype == FIBRIL_TO_MANAGER) { |
191 | if (serialization_count && stype == FIBRIL_TO_MANAGER) { |
205 | serialized_threads++; |
192 | serialized_fibrils++; |
206 | srcf->flags |= FIBRIL_SERIALIZED; |
193 | srcf->flags |= FIBRIL_SERIALIZED; |
207 | } |
194 | } |
208 | fibrils_in_manager++; |
195 | fibrils_in_manager++; |
209 | 196 | ||
210 | if (stype == FIBRIL_FROM_DEAD) |
197 | if (stype == FIBRIL_FROM_DEAD) |
211 | dstf->clean_after_me = srcf; |
198 | dstf->clean_after_me = srcf; |
212 | } else { |
199 | } else { |
213 | if (!list_empty(&serialized_list)) { |
200 | if (!list_empty(&serialized_list)) { |
214 | dstf = list_get_instance(serialized_list.next, fibril_t, |
201 | dstf = list_get_instance(serialized_list.next, fibril_t, |
215 | link); |
202 | link); |
216 | serialized_threads--; |
203 | serialized_fibrils--; |
217 | } else { |
204 | } else { |
218 | dstf = list_get_instance(ready_list.next, fibril_t, |
205 | dstf = list_get_instance(ready_list.next, fibril_t, |
219 | link); |
206 | link); |
220 | } |
207 | } |
221 | } |
208 | } |
222 | list_remove(&dstf->link); |
209 | list_remove(&dstf->link); |
223 | 210 | ||
224 | futex_up(&fibril_futex); |
211 | futex_up(&fibril_futex); |
225 | context_restore(&dstf->ctx); |
212 | context_restore(&dstf->ctx); |
226 | /* not reached */ |
213 | /* not reached */ |
227 | 214 | ||
228 | ret_0: |
215 | ret_0: |
229 | futex_up(&fibril_futex); |
216 | futex_up(&fibril_futex); |
230 | return retval; |
217 | return retval; |
231 | } |
218 | } |
232 | 219 | ||
233 | /** Wait for fibril to finish. |
- | |
234 | * |
- | |
235 | * Each fibril can be only joined by one other fibril. Moreover, the joiner must |
- | |
236 | * be from the same thread as the joinee. |
- | |
237 | * |
- | |
238 | * @param fid Fibril to join. |
- | |
239 | * |
- | |
240 | * @return Value returned by the completed fibril. |
- | |
241 | */ |
- | |
242 | int fibril_join(fid_t fid) |
- | |
243 | { |
- | |
244 | fibril_t *f; |
- | |
245 | fibril_t *cur; |
- | |
246 | - | ||
247 | /* Handle fid = Kernel address -> it is wait for call */ |
- | |
248 | f = (fibril_t *) fid; |
- | |
249 | - | ||
250 | /* |
- | |
251 | * The joiner is running so the joinee isn't. |
- | |
252 | */ |
- | |
253 | cur = __tcb_get()->fibril_data; |
- | |
254 | f->joiner = cur; |
- | |
255 | fibril_schedule_next_adv(FIBRIL_SLEEP); |
- | |
256 | - | ||
257 | /* |
- | |
258 | * The joinee fills in the return value. |
- | |
259 | */ |
- | |
260 | return cur->joinee_retval; |
- | |
261 | } |
- | |
262 | - | ||
263 | /** Create a new fibril. |
220 | /** Create a new fibril. |
264 | * |
221 | * |
265 | * @param func Implementing function of the new fibril. |
222 | * @param func Implementing function of the new fibril. |
266 | * @param arg Argument to pass to func. |
223 | * @param arg Argument to pass to func. |
267 | * |
224 | * |
268 | * @return Return 0 on failure or TLS of the new fibril. |
225 | * @return Return 0 on failure or TLS of the new fibril. |
269 | */ |
226 | */ |
270 | fid_t fibril_create(int (*func)(void *), void *arg) |
227 | fid_t fibril_create(int (*func)(void *), void *arg) |
271 | { |
228 | { |
272 | fibril_t *f; |
229 | fibril_t *f; |
273 | 230 | ||
274 | f = fibril_setup(); |
231 | f = fibril_setup(); |
275 | if (!f) |
232 | if (!f) |
276 | return 0; |
233 | return 0; |
277 | f->stack = (char *) malloc(FIBRIL_INITIAL_STACK_PAGES_NO * |
234 | f->stack = (char *) malloc(FIBRIL_INITIAL_STACK_PAGES_NO * |
278 | getpagesize()); |
235 | getpagesize()); |
279 | 236 | ||
280 | if (!f->stack) { |
237 | if (!f->stack) { |
281 | fibril_teardown(f); |
238 | fibril_teardown(f); |
282 | return 0; |
239 | return 0; |
283 | } |
240 | } |
284 | 241 | ||
285 | f->arg = arg; |
242 | f->arg = arg; |
286 | f->func = func; |
243 | f->func = func; |
287 | f->clean_after_me = NULL; |
244 | f->clean_after_me = NULL; |
288 | f->joiner = NULL; |
- | |
289 | f->joinee_retval = 0; |
- | |
290 | f->retval = 0; |
245 | f->retval = 0; |
291 | f->flags = 0; |
246 | f->flags = 0; |
292 | 247 | ||
293 | context_save(&f->ctx); |
248 | context_save(&f->ctx); |
294 | context_set(&f->ctx, FADDR(fibril_main), f->stack, |
249 | context_set(&f->ctx, FADDR(fibril_main), f->stack, |
295 | FIBRIL_INITIAL_STACK_PAGES_NO * getpagesize(), f->tcb); |
250 | FIBRIL_INITIAL_STACK_PAGES_NO * getpagesize(), f->tcb); |
296 | 251 | ||
297 | return (fid_t) f; |
252 | return (fid_t) f; |
298 | } |
253 | } |
299 | 254 | ||
300 | /** Add a fibril to the ready list. |
255 | /** Add a fibril to the ready list. |
301 | * |
256 | * |
302 | * @param fid Pinter to the fibril structure of the fibril to be added. |
257 | * @param fid Pinter to the fibril structure of the fibril to be added. |
303 | */ |
258 | */ |
304 | void fibril_add_ready(fid_t fid) |
259 | void fibril_add_ready(fid_t fid) |
305 | { |
260 | { |
306 | fibril_t *f; |
261 | fibril_t *f; |
307 | 262 | ||
308 | f = (fibril_t *) fid; |
263 | f = (fibril_t *) fid; |
309 | futex_down(&fibril_futex); |
264 | futex_down(&fibril_futex); |
310 | if ((f->flags & FIBRIL_SERIALIZED)) |
265 | if ((f->flags & FIBRIL_SERIALIZED)) |
311 | list_append(&f->link, &serialized_list); |
266 | list_append(&f->link, &serialized_list); |
312 | else |
267 | else |
313 | list_append(&f->link, &ready_list); |
268 | list_append(&f->link, &ready_list); |
314 | futex_up(&fibril_futex); |
269 | futex_up(&fibril_futex); |
315 | } |
270 | } |
316 | 271 | ||
317 | /** Add a fibril to the manager list. |
272 | /** Add a fibril to the manager list. |
318 | * |
273 | * |
319 | * @param fid Pinter to the fibril structure of the fibril to be added. |
274 | * @param fid Pinter to the fibril structure of the fibril to be added. |
320 | */ |
275 | */ |
321 | void fibril_add_manager(fid_t fid) |
276 | void fibril_add_manager(fid_t fid) |
322 | { |
277 | { |
323 | fibril_t *f; |
278 | fibril_t *f; |
324 | 279 | ||
325 | f = (fibril_t *) fid; |
280 | f = (fibril_t *) fid; |
326 | 281 | ||
327 | futex_down(&fibril_futex); |
282 | futex_down(&fibril_futex); |
328 | list_append(&f->link, &manager_list); |
283 | list_append(&f->link, &manager_list); |
329 | futex_up(&fibril_futex); |
284 | futex_up(&fibril_futex); |
330 | } |
285 | } |
331 | 286 | ||
332 | /** Remove one manager from the manager list. */ |
287 | /** Remove one manager from the manager list. */ |
333 | void fibril_remove_manager(void) |
288 | void fibril_remove_manager(void) |
334 | { |
289 | { |
335 | futex_down(&fibril_futex); |
290 | futex_down(&fibril_futex); |
336 | if (list_empty(&manager_list)) { |
291 | if (list_empty(&manager_list)) { |
337 | futex_up(&fibril_futex); |
292 | futex_up(&fibril_futex); |
338 | return; |
293 | return; |
339 | } |
294 | } |
340 | list_remove(manager_list.next); |
295 | list_remove(manager_list.next); |
341 | futex_up(&fibril_futex); |
296 | futex_up(&fibril_futex); |
342 | } |
297 | } |
343 | 298 | ||
344 | /** Return fibril id of the currently running fibril. |
299 | /** Return fibril id of the currently running fibril. |
345 | * |
300 | * |
346 | * @return Fibril ID of the currently running pseudo thread. |
301 | * @return Fibril ID of the currently running pseudo thread. |
347 | */ |
302 | */ |
348 | fid_t fibril_get_id(void) |
303 | fid_t fibril_get_id(void) |
349 | { |
304 | { |
350 | return (fid_t) __tcb_get()->fibril_data; |
305 | return (fid_t) __tcb_get()->fibril_data; |
351 | } |
306 | } |
352 | 307 | ||
353 | /** Disable preemption |
308 | /** Disable preemption |
354 | * |
309 | * |
355 | * If the fibril wants to send several message in a row and does not want to be |
310 | * If the fibril wants to send several message in a row and does not want to be |
356 | * preempted, it should start async_serialize_start() in the beginning of |
311 | * preempted, it should start async_serialize_start() in the beginning of |
357 | * communication and async_serialize_end() in the end. If it is a true |
312 | * communication and async_serialize_end() in the end. If it is a true |
358 | * multithreaded application, it should protect the communication channel by a |
313 | * multithreaded application, it should protect the communication channel by a |
359 | * futex as well. Interrupt messages can still be preempted. |
314 | * futex as well. Interrupt messages can still be preempted. |
360 | */ |
315 | */ |
361 | void fibril_inc_sercount(void) |
316 | void fibril_inc_sercount(void) |
362 | { |
317 | { |
363 | serialization_count++; |
318 | serialization_count++; |
364 | } |
319 | } |
365 | 320 | ||
366 | /** Restore the preemption counter to the previous state. */ |
321 | /** Restore the preemption counter to the previous state. */ |
367 | void fibril_dec_sercount(void) |
322 | void fibril_dec_sercount(void) |
368 | { |
323 | { |
369 | serialization_count--; |
324 | serialization_count--; |
370 | } |
325 | } |
371 | 326 | ||
372 | /** @} |
327 | /** @} |
373 | */ |
328 | */ |
374 | 329 | ||
375 | 330 |