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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup libc |
29 | /** @addtogroup libc |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <libadt/list.h> |
35 | #include <libadt/list.h> |
36 | #include <psthread.h> |
36 | #include <psthread.h> |
37 | #include <malloc.h> |
37 | #include <malloc.h> |
38 | #include <unistd.h> |
38 | #include <unistd.h> |
39 | #include <thread.h> |
39 | #include <thread.h> |
40 | #include <stdio.h> |
40 | #include <stdio.h> |
41 | #include <kernel/arch/faddr.h> |
41 | #include <kernel/arch/faddr.h> |
42 | #include <futex.h> |
42 | #include <futex.h> |
43 | #include <assert.h> |
43 | #include <assert.h> |
44 | #include <async.h> |
44 | #include <async.h> |
45 | 45 | ||
46 | #ifndef PSTHREAD_INITIAL_STACK_PAGES_NO |
46 | #ifndef PSTHREAD_INITIAL_STACK_PAGES_NO |
47 | #define PSTHREAD_INITIAL_STACK_PAGES_NO 1 |
47 | #define PSTHREAD_INITIAL_STACK_PAGES_NO 1 |
48 | #endif |
48 | #endif |
49 | 49 | ||
50 | static LIST_INITIALIZE(ready_list); |
50 | static LIST_INITIALIZE(ready_list); |
51 | static LIST_INITIALIZE(serialized_list); |
51 | static LIST_INITIALIZE(serialized_list); |
52 | static LIST_INITIALIZE(manager_list); |
52 | static LIST_INITIALIZE(manager_list); |
53 | 53 | ||
54 | static void psthread_main(void); |
54 | static void psthread_main(void); |
55 | 55 | ||
56 | static atomic_t psthread_futex = FUTEX_INITIALIZER; |
56 | static atomic_t psthread_futex = FUTEX_INITIALIZER; |
57 | /** Count of real threads that are in async_serialized mode */ |
57 | /** Count of real threads that are in async_serialized mode */ |
58 | static int serialized_threads; /* Protected by async_futex */ |
58 | static int serialized_threads; /* Protected by async_futex */ |
59 | /** Thread-local count of serialization. If >0, we must not preempt */ |
59 | /** Thread-local count of serialization. If >0, we must not preempt */ |
60 | static __thread int serialization_count; |
60 | static __thread int serialization_count; |
61 | /** Counter of threads residing in async_manager */ |
61 | /** Counter of threads residing in async_manager */ |
62 | static int threads_in_manager; |
62 | static int threads_in_manager; |
63 | 63 | ||
64 | /** Setup PSthread information into TCB structure */ |
64 | /** Setup PSthread information into TCB structure */ |
65 | psthread_data_t * psthread_setup() |
65 | psthread_data_t * psthread_setup() |
66 | { |
66 | { |
67 | psthread_data_t *pt; |
67 | psthread_data_t *pt; |
68 | tcb_t *tcb; |
68 | tcb_t *tcb; |
69 | 69 | ||
70 | tcb = __make_tls(); |
70 | tcb = __make_tls(); |
71 | if (!tcb) |
71 | if (!tcb) |
72 | return NULL; |
72 | return NULL; |
73 | 73 | ||
74 | pt = malloc(sizeof(*pt)); |
74 | pt = malloc(sizeof(*pt)); |
75 | if (!pt) { |
75 | if (!pt) { |
76 | __free_tls(tcb); |
76 | __free_tls(tcb); |
77 | return NULL; |
77 | return NULL; |
78 | } |
78 | } |
79 | 79 | ||
80 | tcb->pst_data = pt; |
80 | tcb->pst_data = pt; |
81 | pt->tcb = tcb; |
81 | pt->tcb = tcb; |
82 | 82 | ||
83 | return pt; |
83 | return pt; |
84 | } |
84 | } |
85 | 85 | ||
86 | void psthread_teardown(psthread_data_t *pt) |
86 | void psthread_teardown(psthread_data_t *pt) |
87 | { |
87 | { |
88 | __free_tls(pt->tcb); |
88 | __free_tls(pt->tcb); |
89 | free(pt); |
89 | free(pt); |
90 | } |
90 | } |
91 | 91 | ||
92 | /** Function that is called on entry to new uspace thread */ |
92 | /** Function that is called on entry to new uspace thread */ |
93 | void psthread_main(void) |
93 | void psthread_main(void) |
94 | { |
94 | { |
95 | psthread_data_t *pt = __tcb_get()->pst_data; |
95 | psthread_data_t *pt = __tcb_get()->pst_data; |
96 | 96 | ||
97 | pt->retval = pt->func(pt->arg); |
97 | pt->retval = pt->func(pt->arg); |
98 | 98 | ||
99 | pt->finished = 1; |
99 | pt->finished = 1; |
100 | if (pt->waiter) |
100 | if (pt->waiter) |
101 | list_append(&pt->waiter->link, &ready_list); |
101 | list_append(&pt->waiter->link, &ready_list); |
102 | 102 | ||
103 | psthread_schedule_next_adv(PS_FROM_DEAD); |
103 | psthread_schedule_next_adv(PS_FROM_DEAD); |
104 | } |
104 | } |
105 | 105 | ||
106 | /** Schedule next userspace pseudo thread. |
106 | /** Schedule next userspace pseudo thread. |
107 | * |
107 | * |
108 | * If calling with PS_TO_MANAGER parameter, the async_futex should be |
108 | * If calling with PS_TO_MANAGER parameter, the async_futex should be |
109 | * held. |
109 | * held. |
110 | * |
110 | * |
111 | * @param ctype Type of switch. |
111 | * @param ctype Type of switch. |
112 | * @return 0 if there is no ready pseudo thread, 1 otherwise. |
112 | * @return 0 if there is no ready pseudo thread, 1 otherwise. |
113 | */ |
113 | */ |
114 | int psthread_schedule_next_adv(pschange_type ctype) |
114 | int psthread_schedule_next_adv(pschange_type ctype) |
115 | { |
115 | { |
116 | psthread_data_t *srcpt, *dstpt; |
116 | psthread_data_t *srcpt, *dstpt; |
117 | int retval = 0; |
117 | int retval = 0; |
118 | 118 | ||
119 | futex_down(&psthread_futex); |
119 | futex_down(&psthread_futex); |
120 | 120 | ||
121 | if (ctype == PS_PREEMPT && list_empty(&ready_list)) |
121 | if (ctype == PS_PREEMPT && list_empty(&ready_list)) |
122 | goto ret_0; |
122 | goto ret_0; |
123 | 123 | ||
124 | if (ctype == PS_FROM_MANAGER) { |
124 | if (ctype == PS_FROM_MANAGER) { |
125 | if (list_empty(&ready_list) && list_empty(&serialized_list)) |
125 | if (list_empty(&ready_list) && list_empty(&serialized_list)) |
126 | goto ret_0; |
126 | goto ret_0; |
127 | /* Do not preempt if there is not sufficient count of thread managers */ |
127 | /* Do not preempt if there is not sufficient count of thread managers */ |
128 | if (list_empty(&serialized_list) && threads_in_manager <= serialized_threads) { |
128 | if (list_empty(&serialized_list) && threads_in_manager <= serialized_threads) { |
129 | goto ret_0; |
129 | goto ret_0; |
130 | } |
130 | } |
131 | } |
131 | } |
132 | /* If we are going to manager and none exists, create it */ |
132 | /* If we are going to manager and none exists, create it */ |
133 | if (ctype == PS_TO_MANAGER || ctype == PS_FROM_DEAD) { |
133 | if (ctype == PS_TO_MANAGER || ctype == PS_FROM_DEAD) { |
134 | while (list_empty(&manager_list)) { |
134 | while (list_empty(&manager_list)) { |
135 | futex_up(&psthread_futex); |
135 | futex_up(&psthread_futex); |
136 | async_create_manager(); |
136 | async_create_manager(); |
137 | futex_down(&psthread_futex); |
137 | futex_down(&psthread_futex); |
138 | } |
138 | } |
139 | } |
139 | } |
140 | 140 | ||
141 | if (ctype != PS_FROM_DEAD) { |
141 | if (ctype != PS_FROM_DEAD) { |
142 | /* Save current state */ |
142 | /* Save current state */ |
143 | srcpt = __tcb_get()->pst_data; |
143 | srcpt = __tcb_get()->pst_data; |
144 | if (!context_save(&srcpt->ctx)) { |
144 | if (!context_save(&srcpt->ctx)) { |
145 | if (serialization_count) |
145 | if (serialization_count) |
146 | srcpt->flags &= ~PSTHREAD_SERIALIZED; |
146 | srcpt->flags &= ~PSTHREAD_SERIALIZED; |
147 | return 1; // futex_up already done here |
147 | return 1; // futex_up already done here |
148 | } |
148 | } |
149 | 149 | ||
150 | /* Save myself to correct run list */ |
150 | /* Save myself to correct run list */ |
151 | if (ctype == PS_PREEMPT) |
151 | if (ctype == PS_PREEMPT) |
152 | list_append(&srcpt->link, &ready_list); |
152 | list_append(&srcpt->link, &ready_list); |
153 | else if (ctype == PS_FROM_MANAGER) { |
153 | else if (ctype == PS_FROM_MANAGER) { |
154 | list_append(&srcpt->link, &manager_list); |
154 | list_append(&srcpt->link, &manager_list); |
155 | threads_in_manager--; |
155 | threads_in_manager--; |
156 | } /* If ctype == PS_TO_MANAGER, don't save ourselves to any list, we should |
156 | } /* If ctype == PS_TO_MANAGER, don't save ourselves to any list, we should |
157 | * already be somewhere, or we will be lost */ |
157 | * already be somewhere, or we will be lost */ |
158 | } |
158 | } else |
- | 159 | srcpt = NULL; /* Avoid GCC warning, if ctype == PS_FROM_DEAD, srcpt is not used */ |
|
159 | 160 | ||
160 | /* Choose new thread to run */ |
161 | /* Choose new thread to run */ |
161 | if (ctype == PS_TO_MANAGER || ctype == PS_FROM_DEAD) { |
162 | if (ctype == PS_TO_MANAGER || ctype == PS_FROM_DEAD) { |
162 | dstpt = list_get_instance(manager_list.next,psthread_data_t, link); |
163 | dstpt = list_get_instance(manager_list.next,psthread_data_t, link); |
163 | if (serialization_count && ctype == PS_TO_MANAGER) { |
164 | if (serialization_count && ctype == PS_TO_MANAGER) { |
164 | serialized_threads++; |
165 | serialized_threads++; |
165 | srcpt->flags |= PSTHREAD_SERIALIZED; |
166 | srcpt->flags |= PSTHREAD_SERIALIZED; |
166 | } |
167 | } |
167 | threads_in_manager++; |
168 | threads_in_manager++; |
168 | } else { |
169 | } else { |
169 | if (!list_empty(&serialized_list)) { |
170 | if (!list_empty(&serialized_list)) { |
170 | dstpt = list_get_instance(serialized_list.next, psthread_data_t, link); |
171 | dstpt = list_get_instance(serialized_list.next, psthread_data_t, link); |
171 | serialized_threads--; |
172 | serialized_threads--; |
172 | } else |
173 | } else |
173 | dstpt = list_get_instance(ready_list.next, psthread_data_t, link); |
174 | dstpt = list_get_instance(ready_list.next, psthread_data_t, link); |
174 | } |
175 | } |
175 | list_remove(&dstpt->link); |
176 | list_remove(&dstpt->link); |
176 | 177 | ||
177 | futex_up(&psthread_futex); |
178 | futex_up(&psthread_futex); |
178 | context_restore(&dstpt->ctx); |
179 | context_restore(&dstpt->ctx); |
179 | 180 | ||
180 | ret_0: |
181 | ret_0: |
181 | futex_up(&psthread_futex); |
182 | futex_up(&psthread_futex); |
182 | return retval; |
183 | return retval; |
183 | } |
184 | } |
184 | 185 | ||
185 | /** Wait for uspace pseudo thread to finish. |
186 | /** Wait for uspace pseudo thread to finish. |
186 | * |
187 | * |
187 | * @param psthrid Pseudo thread to wait for. |
188 | * @param psthrid Pseudo thread to wait for. |
188 | * |
189 | * |
189 | * @return Value returned by the finished thread. |
190 | * @return Value returned by the finished thread. |
190 | */ |
191 | */ |
191 | int psthread_join(pstid_t psthrid) |
192 | int psthread_join(pstid_t psthrid) |
192 | { |
193 | { |
193 | volatile psthread_data_t *pt; |
194 | volatile psthread_data_t *pt; |
194 | volatile int retval; |
195 | volatile int retval; |
195 | 196 | ||
196 | /* Handle psthrid = Kernel address -> it is wait for call */ |
197 | /* Handle psthrid = Kernel address -> it is wait for call */ |
197 | pt = (psthread_data_t *) psthrid; |
198 | pt = (psthread_data_t *) psthrid; |
198 | 199 | ||
199 | /* TODO */ |
200 | /* TODO */ |
200 | printf("join unsupported\n"); |
201 | printf("join unsupported\n"); |
201 | _exit(1); |
202 | _exit(1); |
202 | 203 | ||
203 | retval = pt->retval; |
204 | retval = pt->retval; |
204 | 205 | ||
205 | free(pt->stack); |
206 | free(pt->stack); |
206 | psthread_teardown((void *)pt); |
207 | psthread_teardown((void *)pt); |
207 | 208 | ||
208 | return retval; |
209 | return retval; |
209 | } |
210 | } |
210 | 211 | ||
211 | /** |
212 | /** |
212 | * Create a userspace thread |
213 | * Create a userspace thread |
213 | * |
214 | * |
214 | * @param func Pseudo thread function. |
215 | * @param func Pseudo thread function. |
215 | * @param arg Argument to pass to func. |
216 | * @param arg Argument to pass to func. |
216 | * |
217 | * |
217 | * @return 0 on failure, TLS of the new pseudo thread. |
218 | * @return 0 on failure, TLS of the new pseudo thread. |
218 | */ |
219 | */ |
219 | pstid_t psthread_create(int (*func)(void *), void *arg) |
220 | pstid_t psthread_create(int (*func)(void *), void *arg) |
220 | { |
221 | { |
221 | psthread_data_t *pt; |
222 | psthread_data_t *pt; |
222 | 223 | ||
223 | pt = psthread_setup(); |
224 | pt = psthread_setup(); |
224 | if (!pt) |
225 | if (!pt) |
225 | return 0; |
226 | return 0; |
226 | pt->stack = (char *) malloc(PSTHREAD_INITIAL_STACK_PAGES_NO*getpagesize()); |
227 | pt->stack = (char *) malloc(PSTHREAD_INITIAL_STACK_PAGES_NO*getpagesize()); |
227 | 228 | ||
228 | if (!pt->stack) { |
229 | if (!pt->stack) { |
229 | psthread_teardown(pt); |
230 | psthread_teardown(pt); |
230 | return 0; |
231 | return 0; |
231 | } |
232 | } |
232 | 233 | ||
233 | pt->arg= arg; |
234 | pt->arg= arg; |
234 | pt->func = func; |
235 | pt->func = func; |
235 | pt->finished = 0; |
236 | pt->finished = 0; |
236 | pt->waiter = NULL; |
237 | pt->waiter = NULL; |
237 | pt->flags = 0; |
238 | pt->flags = 0; |
238 | 239 | ||
239 | context_save(&pt->ctx); |
240 | context_save(&pt->ctx); |
240 | context_set(&pt->ctx, FADDR(psthread_main), pt->stack, PSTHREAD_INITIAL_STACK_PAGES_NO*getpagesize(), pt->tcb); |
241 | context_set(&pt->ctx, FADDR(psthread_main), pt->stack, PSTHREAD_INITIAL_STACK_PAGES_NO*getpagesize(), pt->tcb); |
241 | 242 | ||
242 | return (pstid_t )pt; |
243 | return (pstid_t )pt; |
243 | } |
244 | } |
244 | 245 | ||
245 | /** Add a thread to ready list */ |
246 | /** Add a thread to ready list */ |
246 | void psthread_add_ready(pstid_t psthrid) |
247 | void psthread_add_ready(pstid_t psthrid) |
247 | { |
248 | { |
248 | psthread_data_t *pt; |
249 | psthread_data_t *pt; |
249 | 250 | ||
250 | pt = (psthread_data_t *) psthrid; |
251 | pt = (psthread_data_t *) psthrid; |
251 | futex_down(&psthread_futex); |
252 | futex_down(&psthread_futex); |
252 | if ((pt->flags & PSTHREAD_SERIALIZED)) |
253 | if ((pt->flags & PSTHREAD_SERIALIZED)) |
253 | list_append(&pt->link, &serialized_list); |
254 | list_append(&pt->link, &serialized_list); |
254 | else |
255 | else |
255 | list_append(&pt->link, &ready_list); |
256 | list_append(&pt->link, &ready_list); |
256 | futex_up(&psthread_futex); |
257 | futex_up(&psthread_futex); |
257 | } |
258 | } |
258 | 259 | ||
259 | /** Add a thread to manager list */ |
260 | /** Add a thread to manager list */ |
260 | void psthread_add_manager(pstid_t psthrid) |
261 | void psthread_add_manager(pstid_t psthrid) |
261 | { |
262 | { |
262 | psthread_data_t *pt; |
263 | psthread_data_t *pt; |
263 | 264 | ||
264 | pt = (psthread_data_t *) psthrid; |
265 | pt = (psthread_data_t *) psthrid; |
265 | 266 | ||
266 | futex_down(&psthread_futex); |
267 | futex_down(&psthread_futex); |
267 | list_append(&pt->link, &manager_list); |
268 | list_append(&pt->link, &manager_list); |
268 | futex_up(&psthread_futex); |
269 | futex_up(&psthread_futex); |
269 | } |
270 | } |
270 | 271 | ||
271 | /** Remove one manager from manager list */ |
272 | /** Remove one manager from manager list */ |
272 | void psthread_remove_manager() |
273 | void psthread_remove_manager() |
273 | { |
274 | { |
274 | futex_down(&psthread_futex); |
275 | futex_down(&psthread_futex); |
275 | if (list_empty(&manager_list)) { |
276 | if (list_empty(&manager_list)) { |
276 | futex_up(&psthread_futex); |
277 | futex_up(&psthread_futex); |
277 | return; |
278 | return; |
278 | } |
279 | } |
279 | list_remove(manager_list.next); |
280 | list_remove(manager_list.next); |
280 | futex_up(&psthread_futex); |
281 | futex_up(&psthread_futex); |
281 | } |
282 | } |
282 | 283 | ||
283 | /** Return thread id of current running thread */ |
284 | /** Return thread id of current running thread */ |
284 | pstid_t psthread_get_id(void) |
285 | pstid_t psthread_get_id(void) |
285 | { |
286 | { |
286 | return (pstid_t)__tcb_get()->pst_data; |
287 | return (pstid_t)__tcb_get()->pst_data; |
287 | } |
288 | } |
288 | 289 | ||
289 | /** Disable preemption |
290 | /** Disable preemption |
290 | * |
291 | * |
291 | * If the thread wants to send several message in row and does not want |
292 | * If the thread wants to send several message in row and does not want |
292 | * to be preempted, it should start async_serialize_start() in the beginning |
293 | * to be preempted, it should start async_serialize_start() in the beginning |
293 | * of communication and async_serialize_end() in the end. If it is a |
294 | * of communication and async_serialize_end() in the end. If it is a |
294 | * true multithreaded application, it should protect the communication channel |
295 | * true multithreaded application, it should protect the communication channel |
295 | * by a futex as well. Interrupt messages will can still be preempted. |
296 | * by a futex as well. Interrupt messages will can still be preempted. |
296 | */ |
297 | */ |
297 | void psthread_inc_sercount(void) |
298 | void psthread_inc_sercount(void) |
298 | { |
299 | { |
299 | serialization_count++; |
300 | serialization_count++; |
300 | } |
301 | } |
301 | 302 | ||
302 | void psthread_dec_sercount(void) |
303 | void psthread_dec_sercount(void) |
303 | { |
304 | { |
304 | serialization_count--; |
305 | serialization_count--; |
305 | } |
306 | } |
306 | 307 | ||
307 | 308 | ||
308 | /** @} |
309 | /** @} |
309 | */ |
310 | */ |
310 | 311 |