source: mainline/uspace/srv/ns/task.c@ 84dc30c

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 84dc30c was 84dc30c, checked in by Martin Decky <martin@…>, 10 years ago

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1/*
2 * Copyright (c) 2009 Martin Decky
3 * Copyright (c) 2009 Jiri Svoboda
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
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
16 * derived from this software without specific prior written permission.
17 *
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
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup ns
31 * @{
32 */
33
34#include <ipc/ipc.h>
35#include <adt/hash_table.h>
36#include <stdbool.h>
37#include <errno.h>
38#include <assert.h>
39#include <stdio.h>
40#include <macros.h>
41#include <malloc.h>
42#include <types/task.h>
43#include "task.h"
44#include "ns.h"
45
46
47/** Task hash table item. */
48typedef struct {
49 ht_link_t link;
50
51 task_id_t id; /**< Task ID. */
52 bool finished; /**< Task is done. */
53 bool have_rval; /**< Task returned a value. */
54 int retval; /**< The return value. */
55} hashed_task_t;
56
57
58static size_t task_key_hash(void *key)
59{
60 return *(task_id_t*)key;
61}
62
63static size_t task_hash(const ht_link_t *item)
64{
65 hashed_task_t *ht = hash_table_get_inst(item, hashed_task_t, link);
66 return ht->id;
67}
68
69static bool task_key_equal(void *key, const ht_link_t *item)
70{
71 hashed_task_t *ht = hash_table_get_inst(item, hashed_task_t, link);
72 return ht->id == *(task_id_t*)key;
73}
74
75/** Perform actions after removal of item from the hash table. */
76static void task_remove(ht_link_t *item)
77{
78 free(hash_table_get_inst(item, hashed_task_t, link));
79}
80
81/** Operations for task hash table. */
82static hash_table_ops_t task_hash_table_ops = {
83 .hash = task_hash,
84 .key_hash = task_key_hash,
85 .key_equal = task_key_equal,
86 .equal = NULL,
87 .remove_callback = task_remove
88};
89
90/** Task hash table structure. */
91static hash_table_t task_hash_table;
92
93typedef struct {
94 ht_link_t link;
95 sysarg_t in_phone_hash; /**< Incoming phone hash. */
96 task_id_t id; /**< Task ID. */
97} p2i_entry_t;
98
99/* phone-to-id hash table operations */
100
101static size_t p2i_key_hash(void *key)
102{
103 sysarg_t in_phone_hash = *(sysarg_t*)key;
104 return in_phone_hash;
105}
106
107static size_t p2i_hash(const ht_link_t *item)
108{
109 p2i_entry_t *entry = hash_table_get_inst(item, p2i_entry_t, link);
110 return entry->in_phone_hash;
111}
112
113static bool p2i_key_equal(void *key, const ht_link_t *item)
114{
115 sysarg_t in_phone_hash = *(sysarg_t*)key;
116 p2i_entry_t *entry = hash_table_get_inst(item, p2i_entry_t, link);
117
118 return (in_phone_hash == entry->in_phone_hash);
119}
120
121/** Perform actions after removal of item from the hash table.
122 *
123 * @param item Item that was removed from the hash table.
124 *
125 */
126static void p2i_remove(ht_link_t *item)
127{
128 assert(item);
129 free(hash_table_get_inst(item, p2i_entry_t, link));
130}
131
132/** Operations for task hash table. */
133static hash_table_ops_t p2i_ops = {
134 .hash = p2i_hash,
135 .key_hash = p2i_key_hash,
136 .key_equal = p2i_key_equal,
137 .equal = NULL,
138 .remove_callback = p2i_remove
139};
140
141/** Map phone hash to task ID */
142static hash_table_t phone_to_id;
143
144/** Pending task wait structure. */
145typedef struct {
146 link_t link;
147 task_id_t id; /**< Task ID. */
148 ipc_callid_t callid; /**< Call ID waiting for the connection */
149} pending_wait_t;
150
151static list_t pending_wait;
152
153int task_init(void)
154{
155 if (!hash_table_create(&task_hash_table, 0, 0, &task_hash_table_ops)) {
156 printf(NAME ": No memory available for tasks\n");
157 return ENOMEM;
158 }
159
160 if (!hash_table_create(&phone_to_id, 0, 0, &p2i_ops)) {
161 printf(NAME ": No memory available for tasks\n");
162 return ENOMEM;
163 }
164
165 list_initialize(&pending_wait);
166 return EOK;
167}
168
169/** Process pending wait requests */
170void process_pending_wait(void)
171{
172 task_exit_t texit;
173
174loop:
175 list_foreach(pending_wait, link, pending_wait_t, pr) {
176 ht_link_t *link = hash_table_find(&task_hash_table, &pr->id);
177 if (!link)
178 continue;
179
180 hashed_task_t *ht = hash_table_get_inst(link, hashed_task_t, link);
181 if (!ht->finished)
182 continue;
183
184 if (!(pr->callid & IPC_CALLID_NOTIFICATION)) {
185 texit = ht->have_rval ? TASK_EXIT_NORMAL :
186 TASK_EXIT_UNEXPECTED;
187 ipc_answer_2(pr->callid, EOK, texit,
188 ht->retval);
189 }
190
191 list_remove(&pr->link);
192 free(pr);
193 goto loop;
194 }
195}
196
197void wait_for_task(task_id_t id, ipc_call_t *call, ipc_callid_t callid)
198{
199 ht_link_t *link = hash_table_find(&task_hash_table, &id);
200 hashed_task_t *ht = (link != NULL) ?
201 hash_table_get_inst(link, hashed_task_t, link) : NULL;
202
203 if (ht == NULL) {
204 /* No such task exists. */
205 ipc_answer_0(callid, ENOENT);
206 return;
207 }
208
209 if (ht->finished) {
210 task_exit_t texit = ht->have_rval ? TASK_EXIT_NORMAL :
211 TASK_EXIT_UNEXPECTED;
212 ipc_answer_2(callid, EOK, texit, ht->retval);
213 return;
214 }
215
216 /* Add to pending list */
217 pending_wait_t *pr =
218 (pending_wait_t *) malloc(sizeof(pending_wait_t));
219 if (!pr) {
220 if (!(callid & IPC_CALLID_NOTIFICATION))
221 ipc_answer_0(callid, ENOMEM);
222 return;
223 }
224
225 link_initialize(&pr->link);
226 pr->id = id;
227 pr->callid = callid;
228 list_append(&pr->link, &pending_wait);
229}
230
231int ns_task_id_intro(ipc_call_t *call)
232{
233 task_id_t id = MERGE_LOUP32(IPC_GET_ARG1(*call), IPC_GET_ARG2(*call));
234
235 ht_link_t *link = hash_table_find(&phone_to_id, &call->in_phone_hash);
236 if (link != NULL)
237 return EEXISTS;
238
239 p2i_entry_t *entry = (p2i_entry_t *) malloc(sizeof(p2i_entry_t));
240 if (entry == NULL)
241 return ENOMEM;
242
243 hashed_task_t *ht = (hashed_task_t *) malloc(sizeof(hashed_task_t));
244 if (ht == NULL)
245 return ENOMEM;
246
247 /*
248 * Insert into the phone-to-id map.
249 */
250
251 entry->in_phone_hash = call->in_phone_hash;
252 entry->id = id;
253 hash_table_insert(&phone_to_id, &entry->link);
254
255 /*
256 * Insert into the main table.
257 */
258
259 ht->id = id;
260 ht->finished = false;
261 ht->have_rval = false;
262 ht->retval = -1;
263 hash_table_insert(&task_hash_table, &ht->link);
264
265 return EOK;
266}
267
268static int get_id_by_phone(sysarg_t phone_hash, task_id_t *id)
269{
270 ht_link_t *link = hash_table_find(&phone_to_id, &phone_hash);
271 if (link == NULL)
272 return ENOENT;
273
274 p2i_entry_t *entry = hash_table_get_inst(link, p2i_entry_t, link);
275 *id = entry->id;
276
277 return EOK;
278}
279
280int ns_task_retval(ipc_call_t *call)
281{
282 task_id_t id;
283 int rc = get_id_by_phone(call->in_phone_hash, &id);
284 if (rc != EOK)
285 return rc;
286
287 ht_link_t *link = hash_table_find(&task_hash_table, &id);
288 hashed_task_t *ht = (link != NULL) ?
289 hash_table_get_inst(link, hashed_task_t, link) : NULL;
290
291 if ((ht == NULL) || (ht->finished))
292 return EINVAL;
293
294 ht->finished = true;
295 ht->have_rval = true;
296 ht->retval = IPC_GET_ARG1(*call);
297
298 process_pending_wait();
299
300 return EOK;
301}
302
303int ns_task_disconnect(ipc_call_t *call)
304{
305 task_id_t id;
306 int rc = get_id_by_phone(call->in_phone_hash, &id);
307 if (rc != EOK)
308 return rc;
309
310 /* Delete from phone-to-id map. */
311 hash_table_remove(&phone_to_id, &call->in_phone_hash);
312
313 /* Mark task as finished. */
314 ht_link_t *link = hash_table_find(&task_hash_table, &id);
315 if (link == NULL)
316 return EOK;
317
318 hashed_task_t *ht = hash_table_get_inst(link, hashed_task_t, link);
319
320 ht->finished = true;
321
322 process_pending_wait();
323 hash_table_remove(&task_hash_table, &id);
324
325 return EOK;
326}
327
328/**
329 * @}
330 */
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