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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 | /* Lock ordering |
29 | /* Lock ordering |
30 | * |
30 | * |
31 | * First the answerbox, then the phone |
31 | * First the answerbox, then the phone |
32 | */ |
32 | */ |
33 | 33 | ||
34 | #include <synch/spinlock.h> |
34 | #include <synch/spinlock.h> |
35 | #include <synch/waitq.h> |
35 | #include <synch/waitq.h> |
36 | #include <ipc/ipc.h> |
36 | #include <ipc/ipc.h> |
37 | #include <errno.h> |
37 | #include <errno.h> |
38 | #include <mm/slab.h> |
38 | #include <mm/slab.h> |
39 | #include <arch.h> |
39 | #include <arch.h> |
40 | #include <proc/task.h> |
40 | #include <proc/task.h> |
41 | #include <memstr.h> |
41 | #include <memstr.h> |
42 | #include <debug.h> |
42 | #include <debug.h> |
43 | 43 | ||
44 | #include <print.h> |
44 | #include <print.h> |
45 | #include <proc/thread.h> |
45 | #include <proc/thread.h> |
46 | 46 | ||
47 | /* Open channel that is assigned automatically to new tasks */ |
47 | /* Open channel that is assigned automatically to new tasks */ |
48 | answerbox_t *ipc_phone_0 = NULL; |
48 | answerbox_t *ipc_phone_0 = NULL; |
49 | 49 | ||
50 | static slab_cache_t *ipc_call_slab; |
50 | static slab_cache_t *ipc_call_slab; |
51 | 51 | ||
52 | /* Initialize new call */ |
52 | /* Initialize new call */ |
53 | static void _ipc_call_init(call_t *call) |
53 | static void _ipc_call_init(call_t *call) |
54 | { |
54 | { |
55 | memsetb((__address)call, sizeof(*call), 0); |
55 | memsetb((__address)call, sizeof(*call), 0); |
56 | call->callerbox = &TASK->answerbox; |
56 | call->callerbox = &TASK->answerbox; |
57 | call->sender = TASK; |
57 | call->sender = TASK; |
58 | } |
58 | } |
59 | 59 | ||
60 | /** Allocate & initialize call structure |
60 | /** Allocate & initialize call structure |
61 | * |
61 | * |
62 | * The call is initialized, so that the reply will be directed |
62 | * The call is initialized, so that the reply will be directed |
63 | * to TASK->answerbox |
63 | * to TASK->answerbox |
64 | */ |
64 | */ |
65 | call_t * ipc_call_alloc(void) |
65 | call_t * ipc_call_alloc(void) |
66 | { |
66 | { |
67 | call_t *call; |
67 | call_t *call; |
68 | 68 | ||
69 | call = slab_alloc(ipc_call_slab, 0); |
69 | call = slab_alloc(ipc_call_slab, 0); |
70 | _ipc_call_init(call); |
70 | _ipc_call_init(call); |
71 | 71 | ||
72 | return call; |
72 | return call; |
73 | } |
73 | } |
74 | 74 | ||
75 | /** Initialize allocated call */ |
75 | /** Initialize allocated call */ |
76 | void ipc_call_static_init(call_t *call) |
76 | void ipc_call_static_init(call_t *call) |
77 | { |
77 | { |
78 | _ipc_call_init(call); |
78 | _ipc_call_init(call); |
79 | call->flags |= IPC_CALL_STATIC_ALLOC; |
79 | call->flags |= IPC_CALL_STATIC_ALLOC; |
80 | } |
80 | } |
81 | 81 | ||
82 | /** Deallocate call stracuture */ |
82 | /** Deallocate call stracuture */ |
83 | void ipc_call_free(call_t *call) |
83 | void ipc_call_free(call_t *call) |
84 | { |
84 | { |
85 | slab_free(ipc_call_slab, call); |
85 | slab_free(ipc_call_slab, call); |
86 | } |
86 | } |
87 | 87 | ||
88 | /** Initialize answerbox structure |
88 | /** Initialize answerbox structure |
89 | */ |
89 | */ |
90 | void ipc_answerbox_init(answerbox_t *box) |
90 | void ipc_answerbox_init(answerbox_t *box) |
91 | { |
91 | { |
92 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
92 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
93 | waitq_initialize(&box->wq); |
93 | waitq_initialize(&box->wq); |
94 | list_initialize(&box->connected_phones); |
94 | list_initialize(&box->connected_phones); |
95 | list_initialize(&box->calls); |
95 | list_initialize(&box->calls); |
96 | list_initialize(&box->dispatched_calls); |
96 | list_initialize(&box->dispatched_calls); |
97 | list_initialize(&box->answers); |
97 | list_initialize(&box->answers); |
98 | box->task = TASK; |
98 | box->task = TASK; |
99 | } |
99 | } |
100 | 100 | ||
101 | /** Connect phone to answerbox */ |
101 | /** Connect phone to answerbox */ |
102 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
102 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
103 | { |
103 | { |
104 | spinlock_lock(&phone->lock); |
104 | spinlock_lock(&phone->lock); |
105 | 105 | ||
106 | ASSERT(!phone->callee); |
106 | ASSERT(!phone->callee); |
107 | phone->busy = IPC_BUSY_CONNECTED; |
107 | phone->busy = IPC_BUSY_CONNECTED; |
108 | phone->callee = box; |
108 | phone->callee = box; |
109 | 109 | ||
110 | spinlock_lock(&box->lock); |
110 | spinlock_lock(&box->lock); |
111 | list_append(&phone->list, &box->connected_phones); |
111 | list_append(&phone->list, &box->connected_phones); |
112 | spinlock_unlock(&box->lock); |
112 | spinlock_unlock(&box->lock); |
113 | 113 | ||
114 | spinlock_unlock(&phone->lock); |
114 | spinlock_unlock(&phone->lock); |
115 | } |
115 | } |
116 | 116 | ||
117 | /** Initialize phone structure and connect phone to naswerbox |
117 | /** Initialize phone structure and connect phone to naswerbox |
118 | */ |
118 | */ |
119 | void ipc_phone_init(phone_t *phone) |
119 | void ipc_phone_init(phone_t *phone) |
120 | { |
120 | { |
121 | spinlock_initialize(&phone->lock, "phone_lock"); |
121 | spinlock_initialize(&phone->lock, "phone_lock"); |
122 | phone->callee = NULL; |
122 | phone->callee = NULL; |
123 | phone->busy = IPC_BUSY_FREE; |
123 | phone->busy = IPC_BUSY_FREE; |
124 | atomic_set(&phone->active_calls, 0); |
124 | atomic_set(&phone->active_calls, 0); |
125 | } |
125 | } |
126 | 126 | ||
127 | /** Helper function to facilitate synchronous calls */ |
127 | /** Helper function to facilitate synchronous calls */ |
128 | void ipc_call_sync(phone_t *phone, call_t *request) |
128 | void ipc_call_sync(phone_t *phone, call_t *request) |
129 | { |
129 | { |
130 | answerbox_t sync_box; |
130 | answerbox_t sync_box; |
131 | 131 | ||
132 | ipc_answerbox_init(&sync_box); |
132 | ipc_answerbox_init(&sync_box); |
133 | 133 | ||
134 | /* We will receive data on special box */ |
134 | /* We will receive data on special box */ |
135 | request->callerbox = &sync_box; |
135 | request->callerbox = &sync_box; |
136 | 136 | ||
137 | ipc_call(phone, request); |
137 | ipc_call(phone, request); |
138 | ipc_wait_for_call(&sync_box, 0); |
138 | ipc_wait_for_call(&sync_box, 0); |
139 | } |
139 | } |
140 | 140 | ||
141 | /** Answer message that was not dispatched and is not entered in |
141 | /** Answer message that was not dispatched and is not entered in |
142 | * any queue |
142 | * any queue |
143 | */ |
143 | */ |
144 | static void _ipc_answer_free_call(call_t *call) |
144 | static void _ipc_answer_free_call(call_t *call) |
145 | { |
145 | { |
146 | answerbox_t *callerbox = call->callerbox; |
146 | answerbox_t *callerbox = call->callerbox; |
147 | 147 | ||
148 | call->flags &= ~IPC_CALL_DISPATCHED; |
- | |
149 | call->flags |= IPC_CALL_ANSWERED; |
148 | call->flags |= IPC_CALL_ANSWERED; |
150 | 149 | ||
151 | spinlock_lock(&callerbox->lock); |
150 | spinlock_lock(&callerbox->lock); |
152 | list_append(&call->list, &callerbox->answers); |
151 | list_append(&call->list, &callerbox->answers); |
153 | spinlock_unlock(&callerbox->lock); |
152 | spinlock_unlock(&callerbox->lock); |
154 | waitq_wakeup(&callerbox->wq, 0); |
153 | waitq_wakeup(&callerbox->wq, 0); |
155 | } |
154 | } |
156 | 155 | ||
157 | /** Answer message, that is in callee queue |
156 | /** Answer message, that is in callee queue |
158 | * |
157 | * |
159 | * @param box Answerbox that is answering the message |
158 | * @param box Answerbox that is answering the message |
160 | * @param call Modified request that is being sent back |
159 | * @param call Modified request that is being sent back |
161 | */ |
160 | */ |
162 | void ipc_answer(answerbox_t *box, call_t *call) |
161 | void ipc_answer(answerbox_t *box, call_t *call) |
163 | { |
162 | { |
164 | /* Remove from active box */ |
163 | /* Remove from active box */ |
165 | spinlock_lock(&box->lock); |
164 | spinlock_lock(&box->lock); |
166 | list_remove(&call->list); |
165 | list_remove(&call->list); |
167 | spinlock_unlock(&box->lock); |
166 | spinlock_unlock(&box->lock); |
168 | /* Send back answer */ |
167 | /* Send back answer */ |
169 | _ipc_answer_free_call(call); |
168 | _ipc_answer_free_call(call); |
170 | } |
169 | } |
171 | 170 | ||
- | 171 | /** Simulate sending back a message |
|
- | 172 | * |
|
- | 173 | * Most errors are better handled by forming a normal backward |
|
- | 174 | * message and sending it as a normal answer. |
|
- | 175 | */ |
|
- | 176 | void ipc_backsend_err(phone_t *phone, call_t *call, __native err) |
|
- | 177 | { |
|
- | 178 | call->data.phone = phone; |
|
- | 179 | atomic_inc(&phone->active_calls); |
|
- | 180 | if (phone->busy == IPC_BUSY_CONNECTED) |
|
- | 181 | IPC_SET_RETVAL(call->data, EHANGUP); |
|
- | 182 | else |
|
- | 183 | IPC_SET_RETVAL(call->data, ENOENT); |
|
- | 184 | ||
- | 185 | _ipc_answer_free_call(call); |
|
- | 186 | } |
|
- | 187 | ||
172 | /* Unsafe unchecking ipc_call */ |
188 | /* Unsafe unchecking ipc_call */ |
173 | static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call) |
189 | static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call) |
174 | { |
190 | { |
175 | if (! (call->flags & IPC_CALL_FORWARDED)) { |
191 | if (! (call->flags & IPC_CALL_FORWARDED)) { |
176 | atomic_inc(&phone->active_calls); |
192 | atomic_inc(&phone->active_calls); |
177 | call->data.phone = phone; |
193 | call->data.phone = phone; |
178 | } |
194 | } |
179 | 195 | ||
180 | spinlock_lock(&box->lock); |
196 | spinlock_lock(&box->lock); |
181 | list_append(&call->list, &box->calls); |
197 | list_append(&call->list, &box->calls); |
182 | spinlock_unlock(&box->lock); |
198 | spinlock_unlock(&box->lock); |
183 | waitq_wakeup(&box->wq, 0); |
199 | waitq_wakeup(&box->wq, 0); |
184 | } |
200 | } |
185 | 201 | ||
186 | /** Send a asynchronous request using phone to answerbox |
202 | /** Send a asynchronous request using phone to answerbox |
187 | * |
203 | * |
188 | * @param phone Phone connected to answerbox |
204 | * @param phone Phone connected to answerbox |
189 | * @param request Request to be sent |
205 | * @param request Request to be sent |
190 | */ |
206 | */ |
191 | int ipc_call(phone_t *phone, call_t *call) |
207 | int ipc_call(phone_t *phone, call_t *call) |
192 | { |
208 | { |
193 | answerbox_t *box; |
209 | answerbox_t *box; |
194 | 210 | ||
195 | spinlock_lock(&phone->lock); |
211 | spinlock_lock(&phone->lock); |
196 | 212 | ||
197 | box = phone->callee; |
213 | box = phone->callee; |
198 | if (!box) { |
214 | if (!box) { |
199 | /* Trying to send over disconnected phone */ |
215 | /* Trying to send over disconnected phone */ |
200 | spinlock_unlock(&phone->lock); |
216 | spinlock_unlock(&phone->lock); |
201 | if (call->flags & IPC_CALL_FORWARDED) { |
217 | if (call->flags & IPC_CALL_FORWARDED) { |
202 | IPC_SET_RETVAL(call->data, EFORWARD); |
218 | IPC_SET_RETVAL(call->data, EFORWARD); |
- | 219 | _ipc_answer_free_call(call); |
|
203 | } else { /* Simulate sending a message */ |
220 | } else { /* Simulate sending back a message */ |
204 | call->data.phone = phone; |
- | |
205 | atomic_inc(&phone->active_calls); |
- | |
206 | if (phone->busy == IPC_BUSY_CONNECTED) |
221 | if (phone->busy == IPC_BUSY_CONNECTED) |
207 | IPC_SET_RETVAL(call->data, EHANGUP); |
222 | ipc_backsend_err(phone, call, EHANGUP); |
208 | else |
223 | else |
209 | IPC_SET_RETVAL(call->data, ENOENT); |
224 | ipc_backsend_err(phone, call, ENOENT); |
210 | } |
225 | } |
211 | 226 | ||
212 | _ipc_answer_free_call(call); |
- | |
213 | return ENOENT; |
227 | return ENOENT; |
214 | } |
228 | } |
215 | _ipc_call(phone, box, call); |
229 | _ipc_call(phone, box, call); |
216 | 230 | ||
217 | spinlock_unlock(&phone->lock); |
231 | spinlock_unlock(&phone->lock); |
218 | return 0; |
232 | return 0; |
219 | } |
233 | } |
220 | 234 | ||
221 | /** Disconnect phone from answerbox |
235 | /** Disconnect phone from answerbox |
222 | * |
236 | * |
223 | * It is allowed to call disconnect on already disconnected phone |
237 | * It is allowed to call disconnect on already disconnected phone |
224 | * |
238 | * |
225 | * @return 0 - phone disconnected, -1 - the phone was already disconnected |
239 | * @return 0 - phone disconnected, -1 - the phone was already disconnected |
226 | */ |
240 | */ |
227 | int ipc_phone_hangup(phone_t *phone) |
241 | int ipc_phone_hangup(phone_t *phone) |
228 | { |
242 | { |
229 | answerbox_t *box; |
243 | answerbox_t *box; |
230 | call_t *call; |
244 | call_t *call; |
231 | 245 | ||
232 | spinlock_lock(&phone->lock); |
246 | spinlock_lock(&phone->lock); |
233 | box = phone->callee; |
247 | box = phone->callee; |
234 | if (!box) { |
248 | if (!box) { |
235 | if (phone->busy == IPC_BUSY_CONNECTING) { |
249 | if (phone->busy == IPC_BUSY_CONNECTING) { |
236 | spinlock_unlock(&phone->lock); |
250 | spinlock_unlock(&phone->lock); |
237 | return -1; |
251 | return -1; |
238 | } |
252 | } |
239 | /* Already disconnected phone */ |
253 | /* Already disconnected phone */ |
240 | phone->busy = IPC_BUSY_FREE; |
254 | phone->busy = IPC_BUSY_FREE; |
241 | spinlock_unlock(&phone->lock); |
255 | spinlock_unlock(&phone->lock); |
242 | return 0; |
256 | return 0; |
243 | } |
257 | } |
244 | 258 | ||
245 | spinlock_lock(&box->lock); |
259 | spinlock_lock(&box->lock); |
246 | list_remove(&phone->list); |
260 | list_remove(&phone->list); |
247 | phone->callee = NULL; |
261 | phone->callee = NULL; |
248 | spinlock_unlock(&box->lock); |
262 | spinlock_unlock(&box->lock); |
249 | 263 | ||
250 | call = ipc_call_alloc(); |
264 | call = ipc_call_alloc(); |
251 | IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP); |
265 | IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP); |
252 | call->flags |= IPC_CALL_DISCARD_ANSWER; |
266 | call->flags |= IPC_CALL_DISCARD_ANSWER; |
253 | _ipc_call(phone, box, call); |
267 | _ipc_call(phone, box, call); |
254 | 268 | ||
255 | phone->busy = IPC_BUSY_FREE; |
269 | phone->busy = IPC_BUSY_FREE; |
256 | 270 | ||
257 | spinlock_unlock(&phone->lock); |
271 | spinlock_unlock(&phone->lock); |
258 | 272 | ||
259 | return 0; |
273 | return 0; |
260 | } |
274 | } |
261 | 275 | ||
262 | /** Forwards call from one answerbox to a new one |
276 | /** Forwards call from one answerbox to a new one |
263 | * |
277 | * |
264 | * @param request Request to be forwarded |
278 | * @param request Request to be forwarded |
265 | * @param newbox Target answerbox |
279 | * @param newbox Target answerbox |
266 | * @param oldbox Old answerbox |
280 | * @param oldbox Old answerbox |
267 | * @return 0 on forward ok, error code, if there was error |
281 | * @return 0 on forward ok, error code, if there was error |
268 | * |
282 | * |
269 | * - the return value serves only as an information for the forwarder, |
283 | * - the return value serves only as an information for the forwarder, |
270 | * the original caller is notified automatically with EFORWARD |
284 | * the original caller is notified automatically with EFORWARD |
271 | */ |
285 | */ |
272 | int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox) |
286 | int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox) |
273 | { |
287 | { |
274 | spinlock_lock(&oldbox->lock); |
288 | spinlock_lock(&oldbox->lock); |
275 | list_remove(&call->list); |
289 | list_remove(&call->list); |
276 | spinlock_unlock(&oldbox->lock); |
290 | spinlock_unlock(&oldbox->lock); |
277 | 291 | ||
278 | return ipc_call(newphone, call); |
292 | return ipc_call(newphone, call); |
279 | } |
293 | } |
280 | 294 | ||
281 | 295 | ||
282 | /** Wait for phone call |
296 | /** Wait for phone call |
283 | * |
297 | * |
284 | * @return Recived message address |
298 | * @return Recived message address |
285 | * - to distinguish between call and answer, look at call->flags |
299 | * - to distinguish between call and answer, look at call->flags |
286 | */ |
300 | */ |
287 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
301 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
288 | { |
302 | { |
289 | call_t *request; |
303 | call_t *request; |
290 | 304 | ||
291 | restart: |
305 | restart: |
292 | if (flags & IPC_WAIT_NONBLOCKING) { |
306 | if (flags & IPC_WAIT_NONBLOCKING) { |
293 | if (waitq_sleep_timeout(&box->wq,0,1) == ESYNCH_WOULD_BLOCK) |
307 | if (waitq_sleep_timeout(&box->wq,0,1) == ESYNCH_WOULD_BLOCK) |
294 | return NULL; |
308 | return NULL; |
295 | } else |
309 | } else |
296 | waitq_sleep(&box->wq); |
310 | waitq_sleep(&box->wq); |
297 | 311 | ||
298 | spinlock_lock(&box->lock); |
312 | spinlock_lock(&box->lock); |
299 | if (!list_empty(&box->answers)) { |
313 | if (!list_empty(&box->answers)) { |
300 | /* Handle asynchronous answers */ |
314 | /* Handle asynchronous answers */ |
301 | request = list_get_instance(box->answers.next, call_t, list); |
315 | request = list_get_instance(box->answers.next, call_t, list); |
302 | list_remove(&request->list); |
316 | list_remove(&request->list); |
303 | atomic_dec(&request->data.phone->active_calls); |
317 | atomic_dec(&request->data.phone->active_calls); |
304 | } else if (!list_empty(&box->calls)) { |
318 | } else if (!list_empty(&box->calls)) { |
305 | /* Handle requests */ |
319 | /* Handle requests */ |
306 | request = list_get_instance(box->calls.next, call_t, list); |
320 | request = list_get_instance(box->calls.next, call_t, list); |
307 | list_remove(&request->list); |
321 | list_remove(&request->list); |
308 | /* Append request to dispatch queue */ |
322 | /* Append request to dispatch queue */ |
309 | list_append(&request->list, &box->dispatched_calls); |
323 | list_append(&request->list, &box->dispatched_calls); |
310 | request->flags |= IPC_CALL_DISPATCHED; |
- | |
311 | } else { |
324 | } else { |
312 | printf("WARNING: Spurious IPC wakeup.\n"); |
325 | printf("WARNING: Spurious IPC wakeup.\n"); |
313 | spinlock_unlock(&box->lock); |
326 | spinlock_unlock(&box->lock); |
314 | goto restart; |
327 | goto restart; |
315 | } |
328 | } |
316 | spinlock_unlock(&box->lock); |
329 | spinlock_unlock(&box->lock); |
317 | return request; |
330 | return request; |
318 | } |
331 | } |
319 | 332 | ||
320 | /** Initilize ipc subsystem */ |
333 | /** Initilize ipc subsystem */ |
321 | void ipc_init(void) |
334 | void ipc_init(void) |
322 | { |
335 | { |
323 | ipc_call_slab = slab_cache_create("ipc_call", |
336 | ipc_call_slab = slab_cache_create("ipc_call", |
324 | sizeof(call_t), |
337 | sizeof(call_t), |
325 | 0, |
338 | 0, |
326 | NULL, NULL, 0); |
339 | NULL, NULL, 0); |
327 | } |
340 | } |
328 | 341 | ||
329 | /** Cleans up all IPC communication of the given task |
342 | /** Cleans up all IPC communication of the given task |
330 | * |
343 | * |
331 | * |
344 | * |
332 | */ |
345 | */ |
333 | void ipc_cleanup(task_t *task) |
346 | void ipc_cleanup(task_t *task) |
334 | { |
347 | { |
335 | int i; |
348 | int i; |
336 | 349 | ||
337 | /* Disconnect all our phones ('ipc_phone_hangup') */ |
350 | /* Disconnect all our phones ('ipc_phone_hangup') */ |
338 | for (i=0;i < IPC_MAX_PHONES; i++) |
351 | for (i=0;i < IPC_MAX_PHONES; i++) |
339 | ipc_phone_hangup(&task->phones[i]); |
352 | ipc_phone_hangup(&task->phones[i]); |
340 | 353 | ||
341 | /* Disconnect all phones connected to answerbox */ |
354 | /* Disconnect all phones connected to answerbox */ |
342 | 355 | ||
343 | /* Answer all messages in 'calls' and 'dispatched_calls' queues */ |
356 | /* Answer all messages in 'calls' and 'dispatched_calls' queues */ |
344 | 357 | ||
345 | /* Wait for all async answers to arrive */ |
358 | /* Wait for all async answers to arrive */ |
346 | } |
359 | } |
347 | 360 |