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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
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 | /** |
29 | /** |
30 | * @file futex.c |
30 | * @file futex.c |
31 | * @brief Kernel backend for futexes. |
31 | * @brief Kernel backend for futexes. |
32 | */ |
32 | */ |
33 | 33 | ||
34 | #include <synch/futex.h> |
34 | #include <synch/futex.h> |
35 | #include <synch/rwlock.h> |
35 | #include <synch/rwlock.h> |
36 | #include <synch/spinlock.h> |
36 | #include <synch/spinlock.h> |
37 | #include <synch/synch.h> |
37 | #include <synch/synch.h> |
38 | #include <mm/frame.h> |
38 | #include <mm/frame.h> |
39 | #include <mm/page.h> |
39 | #include <mm/page.h> |
40 | #include <mm/slab.h> |
40 | #include <mm/slab.h> |
41 | #include <proc/thread.h> |
41 | #include <proc/thread.h> |
42 | #include <proc/task.h> |
42 | #include <proc/task.h> |
43 | #include <genarch/mm/page_pt.h> |
43 | #include <genarch/mm/page_pt.h> |
44 | #include <genarch/mm/page_ht.h> |
44 | #include <genarch/mm/page_ht.h> |
45 | #include <adt/hash_table.h> |
45 | #include <adt/hash_table.h> |
46 | #include <adt/list.h> |
46 | #include <adt/list.h> |
47 | #include <arch.h> |
47 | #include <arch.h> |
48 | #include <align.h> |
48 | #include <align.h> |
49 | #include <panic.h> |
49 | #include <panic.h> |
50 | #include <errno.h> |
50 | #include <errno.h> |
51 | #include <print.h> |
51 | #include <print.h> |
52 | 52 | ||
53 | #define FUTEX_HT_SIZE 1024 /* keep it a power of 2 */ |
53 | #define FUTEX_HT_SIZE 1024 /* keep it a power of 2 */ |
54 | 54 | ||
55 | static void futex_initialize(futex_t *futex); |
55 | static void futex_initialize(futex_t *futex); |
56 | 56 | ||
57 | static futex_t *futex_find(__address paddr); |
57 | static futex_t *futex_find(__address paddr); |
58 | static index_t futex_ht_hash(__native *key); |
58 | static index_t futex_ht_hash(__native *key); |
59 | static bool futex_ht_compare(__native *key, count_t keys, link_t *item); |
59 | static bool futex_ht_compare(__native *key, count_t keys, link_t *item); |
60 | static void futex_ht_remove_callback(link_t *item); |
60 | static void futex_ht_remove_callback(link_t *item); |
61 | 61 | ||
62 | /** |
62 | /** |
63 | * Read-write lock protecting global futex hash table. |
63 | * Read-write lock protecting global futex hash table. |
64 | * It is also used to serialize access to all futex_t structures. |
64 | * It is also used to serialize access to all futex_t structures. |
65 | * Must be acquired before the task futex B+tree lock. |
65 | * Must be acquired before the task futex B+tree lock. |
66 | */ |
66 | */ |
67 | static rwlock_t futex_ht_lock; |
67 | static rwlock_t futex_ht_lock; |
68 | 68 | ||
69 | /** Futex hash table. */ |
69 | /** Futex hash table. */ |
70 | static hash_table_t futex_ht; |
70 | static hash_table_t futex_ht; |
71 | 71 | ||
72 | /** Futex hash table operations. */ |
72 | /** Futex hash table operations. */ |
73 | static hash_table_operations_t futex_ht_ops = { |
73 | static hash_table_operations_t futex_ht_ops = { |
74 | .hash = futex_ht_hash, |
74 | .hash = futex_ht_hash, |
75 | .compare = futex_ht_compare, |
75 | .compare = futex_ht_compare, |
76 | .remove_callback = futex_ht_remove_callback |
76 | .remove_callback = futex_ht_remove_callback |
77 | }; |
77 | }; |
78 | 78 | ||
79 | /** Initialize futex subsystem. */ |
79 | /** Initialize futex subsystem. */ |
80 | void futex_init(void) |
80 | void futex_init(void) |
81 | { |
81 | { |
82 | rwlock_initialize(&futex_ht_lock); |
82 | rwlock_initialize(&futex_ht_lock); |
83 | hash_table_create(&futex_ht, FUTEX_HT_SIZE, 1, &futex_ht_ops); |
83 | hash_table_create(&futex_ht, FUTEX_HT_SIZE, 1, &futex_ht_ops); |
84 | } |
84 | } |
85 | 85 | ||
86 | /** Initialize kernel futex structure. |
86 | /** Initialize kernel futex structure. |
87 | * |
87 | * |
88 | * @param futex Kernel futex structure. |
88 | * @param futex Kernel futex structure. |
89 | */ |
89 | */ |
90 | void futex_initialize(futex_t *futex) |
90 | void futex_initialize(futex_t *futex) |
91 | { |
91 | { |
92 | waitq_initialize(&futex->wq); |
92 | waitq_initialize(&futex->wq); |
93 | link_initialize(&futex->ht_link); |
93 | link_initialize(&futex->ht_link); |
94 | futex->paddr = 0; |
94 | futex->paddr = 0; |
95 | futex->refcount = 1; |
95 | futex->refcount = 1; |
96 | } |
96 | } |
97 | 97 | ||
98 | /** Sleep in futex wait queue. |
98 | /** Sleep in futex wait queue. |
99 | * |
99 | * |
100 | * @param uaddr Userspace address of the futex counter. |
100 | * @param uaddr Userspace address of the futex counter. |
101 | * @param usec If non-zero, number of microseconds this thread is willing to sleep. |
101 | * @param usec If non-zero, number of microseconds this thread is willing to sleep. |
102 | * @param flags Select mode of operation. |
102 | * @param flags Select mode of operation. |
103 | * |
103 | * |
104 | * @return One of ESYNCH_TIMEOUT, ESYNCH_OK_ATOMIC and ESYNCH_OK_BLOCKED. See synch.h. |
104 | * @return One of ESYNCH_TIMEOUT, ESYNCH_OK_ATOMIC and ESYNCH_OK_BLOCKED. See synch.h. |
105 | * If there is no physical mapping for uaddr ENOENT is returned. |
105 | * If there is no physical mapping for uaddr ENOENT is returned. |
106 | */ |
106 | */ |
107 | __native sys_futex_sleep_timeout(__address uaddr, __u32 usec, int flags) |
107 | __native sys_futex_sleep_timeout(__address uaddr, __u32 usec, int flags) |
108 | { |
108 | { |
109 | futex_t *futex; |
109 | futex_t *futex; |
110 | __address paddr; |
110 | __address paddr; |
111 | pte_t *t; |
111 | pte_t *t; |
112 | ipl_t ipl; |
112 | ipl_t ipl; |
113 | 113 | ||
114 | ipl = interrupts_disable(); |
114 | ipl = interrupts_disable(); |
115 | 115 | ||
116 | /* |
116 | /* |
117 | * Find physical address of futex counter. |
117 | * Find physical address of futex counter. |
118 | */ |
118 | */ |
119 | page_table_lock(AS, true); |
119 | page_table_lock(AS, true); |
120 | t = page_mapping_find(AS, ALIGN_DOWN(uaddr, PAGE_SIZE)); |
120 | t = page_mapping_find(AS, ALIGN_DOWN(uaddr, PAGE_SIZE)); |
121 | if (!t || !PTE_VALID(t) || !PTE_PRESENT(t)) { |
121 | if (!t || !PTE_VALID(t) || !PTE_PRESENT(t)) { |
122 | page_table_unlock(AS, true); |
122 | page_table_unlock(AS, true); |
123 | interrupts_restore(ipl); |
123 | interrupts_restore(ipl); |
124 | return (__native) ENOENT; |
124 | return (__native) ENOENT; |
125 | } |
125 | } |
126 | paddr = PTE_GET_FRAME(t) + (uaddr - ALIGN_DOWN(uaddr, PAGE_SIZE)); |
126 | paddr = PTE_GET_FRAME(t) + (uaddr - ALIGN_DOWN(uaddr, PAGE_SIZE)); |
127 | page_table_unlock(AS, true); |
127 | page_table_unlock(AS, true); |
128 | 128 | ||
129 | interrupts_restore(ipl); |
129 | interrupts_restore(ipl); |
130 | 130 | ||
131 | futex = futex_find(paddr); |
131 | futex = futex_find(paddr); |
132 | 132 | ||
133 | return (__native) waitq_sleep_timeout(&futex->wq, usec, flags | SYNCH_FLAGS_INTERRUPTIBLE); |
133 | return (__native) waitq_sleep_timeout(&futex->wq, usec, flags | SYNCH_FLAGS_INTERRUPTIBLE); |
134 | } |
134 | } |
135 | 135 | ||
136 | /** Wakeup one thread waiting in futex wait queue. |
136 | /** Wakeup one thread waiting in futex wait queue. |
137 | * |
137 | * |
138 | * @param uaddr Userspace address of the futex counter. |
138 | * @param uaddr Userspace address of the futex counter. |
139 | * |
139 | * |
140 | * @return ENOENT if there is no physical mapping for uaddr. |
140 | * @return ENOENT if there is no physical mapping for uaddr. |
141 | */ |
141 | */ |
142 | __native sys_futex_wakeup(__address uaddr) |
142 | __native sys_futex_wakeup(__address uaddr) |
143 | { |
143 | { |
144 | futex_t *futex; |
144 | futex_t *futex; |
145 | __address paddr; |
145 | __address paddr; |
146 | pte_t *t; |
146 | pte_t *t; |
147 | ipl_t ipl; |
147 | ipl_t ipl; |
148 | 148 | ||
149 | ipl = interrupts_disable(); |
149 | ipl = interrupts_disable(); |
150 | 150 | ||
151 | /* |
151 | /* |
152 | * Find physical address of futex counter. |
152 | * Find physical address of futex counter. |
153 | */ |
153 | */ |
154 | page_table_lock(AS, true); |
154 | page_table_lock(AS, true); |
155 | t = page_mapping_find(AS, ALIGN_DOWN(uaddr, PAGE_SIZE)); |
155 | t = page_mapping_find(AS, ALIGN_DOWN(uaddr, PAGE_SIZE)); |
156 | if (!t || !PTE_VALID(t) || !PTE_PRESENT(t)) { |
156 | if (!t || !PTE_VALID(t) || !PTE_PRESENT(t)) { |
157 | page_table_unlock(AS, true); |
157 | page_table_unlock(AS, true); |
158 | interrupts_restore(ipl); |
158 | interrupts_restore(ipl); |
159 | return (__native) ENOENT; |
159 | return (__native) ENOENT; |
160 | } |
160 | } |
161 | paddr = PTE_GET_FRAME(t) + (uaddr - ALIGN_DOWN(uaddr, PAGE_SIZE)); |
161 | paddr = PTE_GET_FRAME(t) + (uaddr - ALIGN_DOWN(uaddr, PAGE_SIZE)); |
162 | page_table_unlock(AS, true); |
162 | page_table_unlock(AS, true); |
163 | 163 | ||
164 | interrupts_restore(ipl); |
164 | interrupts_restore(ipl); |
165 | 165 | ||
166 | futex = futex_find(paddr); |
166 | futex = futex_find(paddr); |
167 | 167 | ||
168 | waitq_wakeup(&futex->wq, WAKEUP_FIRST); |
168 | waitq_wakeup(&futex->wq, WAKEUP_FIRST); |
169 | 169 | ||
170 | return 0; |
170 | return 0; |
171 | } |
171 | } |
172 | 172 | ||
173 | /** Find kernel address of the futex structure corresponding to paddr. |
173 | /** Find kernel address of the futex structure corresponding to paddr. |
174 | * |
174 | * |
175 | * If the structure does not exist already, a new one is created. |
175 | * If the structure does not exist already, a new one is created. |
176 | * |
176 | * |
177 | * @param paddr Physical address of the userspace futex counter. |
177 | * @param paddr Physical address of the userspace futex counter. |
178 | * |
178 | * |
179 | * @return Address of the kernel futex structure. |
179 | * @return Address of the kernel futex structure. |
180 | */ |
180 | */ |
181 | futex_t *futex_find(__address paddr) |
181 | futex_t *futex_find(__address paddr) |
182 | { |
182 | { |
183 | link_t *item; |
183 | link_t *item; |
184 | futex_t *futex; |
184 | futex_t *futex; |
185 | btree_node_t *leaf; |
185 | btree_node_t *leaf; |
186 | 186 | ||
187 | /* |
187 | /* |
188 | * Find the respective futex structure |
188 | * Find the respective futex structure |
189 | * or allocate new one if it does not exist already. |
189 | * or allocate new one if it does not exist already. |
190 | */ |
190 | */ |
191 | rwlock_read_lock(&futex_ht_lock); |
191 | rwlock_read_lock(&futex_ht_lock); |
192 | item = hash_table_find(&futex_ht, &paddr); |
192 | item = hash_table_find(&futex_ht, &paddr); |
193 | if (item) { |
193 | if (item) { |
194 | futex = hash_table_get_instance(item, futex_t, ht_link); |
194 | futex = hash_table_get_instance(item, futex_t, ht_link); |
195 | 195 | ||
196 | /* |
196 | /* |
197 | * See if the current task knows this futex. |
197 | * See if the current task knows this futex. |
198 | */ |
198 | */ |
199 | mutex_lock(&TASK->futexes_lock); |
199 | mutex_lock(&TASK->futexes_lock); |
200 | if (!btree_search(&TASK->futexes, paddr, &leaf)) { |
200 | if (!btree_search(&TASK->futexes, paddr, &leaf)) { |
201 | /* |
201 | /* |
202 | * The futex is new to the current task. |
202 | * The futex is new to the current task. |
203 | * However, we only have read access. |
203 | * However, we only have read access. |
204 | * Gain write access and try again. |
204 | * Gain write access and try again. |
205 | */ |
205 | */ |
206 | mutex_unlock(&TASK->futexes_lock); |
206 | mutex_unlock(&TASK->futexes_lock); |
207 | goto gain_write_access; |
207 | goto gain_write_access; |
208 | } |
208 | } |
209 | mutex_unlock(&TASK->futexes_lock); |
209 | mutex_unlock(&TASK->futexes_lock); |
210 | 210 | ||
211 | rwlock_read_unlock(&futex_ht_lock); |
211 | rwlock_read_unlock(&futex_ht_lock); |
212 | } else { |
212 | } else { |
213 | gain_write_access: |
213 | gain_write_access: |
214 | /* |
214 | /* |
215 | * Upgrade to writer is not currently supported, |
215 | * Upgrade to writer is not currently supported, |
216 | * therefore, it is necessary to release the read lock |
216 | * therefore, it is necessary to release the read lock |
217 | * and reacquire it as a writer. |
217 | * and reacquire it as a writer. |
218 | */ |
218 | */ |
219 | rwlock_read_unlock(&futex_ht_lock); |
219 | rwlock_read_unlock(&futex_ht_lock); |
220 | 220 | ||
221 | rwlock_write_lock(&futex_ht_lock); |
221 | rwlock_write_lock(&futex_ht_lock); |
222 | /* |
222 | /* |
223 | * Avoid possible race condition by searching |
223 | * Avoid possible race condition by searching |
224 | * the hash table once again with write access. |
224 | * the hash table once again with write access. |
225 | */ |
225 | */ |
226 | item = hash_table_find(&futex_ht, &paddr); |
226 | item = hash_table_find(&futex_ht, &paddr); |
227 | if (item) { |
227 | if (item) { |
228 | futex = hash_table_get_instance(item, futex_t, ht_link); |
228 | futex = hash_table_get_instance(item, futex_t, ht_link); |
229 | 229 | ||
230 | /* |
230 | /* |
231 | * See if this futex is known to the current task. |
231 | * See if this futex is known to the current task. |
232 | */ |
232 | */ |
233 | mutex_lock(&TASK->futexes_lock); |
233 | mutex_lock(&TASK->futexes_lock); |
234 | if (!btree_search(&TASK->futexes, paddr, &leaf)) { |
234 | if (!btree_search(&TASK->futexes, paddr, &leaf)) { |
235 | /* |
235 | /* |
236 | * The futex is new to the current task. |
236 | * The futex is new to the current task. |
237 | * Upgrade its reference count and put it to the |
237 | * Upgrade its reference count and put it to the |
238 | * current task's B+tree of known futexes. |
238 | * current task's B+tree of known futexes. |
239 | */ |
239 | */ |
240 | futex->refcount++; |
240 | futex->refcount++; |
241 | btree_insert(&TASK->futexes, paddr, futex, leaf); |
241 | btree_insert(&TASK->futexes, paddr, futex, leaf); |
242 | } |
242 | } |
243 | mutex_unlock(&TASK->futexes_lock); |
243 | mutex_unlock(&TASK->futexes_lock); |
244 | 244 | ||
245 | rwlock_write_unlock(&futex_ht_lock); |
245 | rwlock_write_unlock(&futex_ht_lock); |
246 | } else { |
246 | } else { |
247 | futex = (futex_t *) malloc(sizeof(futex_t), 0); |
247 | futex = (futex_t *) malloc(sizeof(futex_t), 0); |
248 | futex_initialize(futex); |
248 | futex_initialize(futex); |
249 | futex->paddr = paddr; |
249 | futex->paddr = paddr; |
250 | hash_table_insert(&futex_ht, &paddr, &futex->ht_link); |
250 | hash_table_insert(&futex_ht, &paddr, &futex->ht_link); |
251 | 251 | ||
252 | /* |
252 | /* |
253 | * This is the first task referencing the futex. |
253 | * This is the first task referencing the futex. |
254 | * It can be directly inserted into its |
254 | * It can be directly inserted into its |
255 | * B+tree of known futexes. |
255 | * B+tree of known futexes. |
256 | */ |
256 | */ |
257 | mutex_lock(&TASK->futexes_lock); |
257 | mutex_lock(&TASK->futexes_lock); |
258 | btree_insert(&TASK->futexes, paddr, futex, NULL); |
258 | btree_insert(&TASK->futexes, paddr, futex, NULL); |
259 | mutex_unlock(&TASK->futexes_lock); |
259 | mutex_unlock(&TASK->futexes_lock); |
260 | 260 | ||
261 | rwlock_write_unlock(&futex_ht_lock); |
261 | rwlock_write_unlock(&futex_ht_lock); |
262 | } |
262 | } |
263 | } |
263 | } |
264 | 264 | ||
265 | return futex; |
265 | return futex; |
266 | } |
266 | } |
267 | 267 | ||
268 | /** Compute hash index into futex hash table. |
268 | /** Compute hash index into futex hash table. |
269 | * |
269 | * |
270 | * @param key Address where the key (i.e. physical address of futex counter) is stored. |
270 | * @param key Address where the key (i.e. physical address of futex counter) is stored. |
271 | * |
271 | * |
272 | * @return Index into futex hash table. |
272 | * @return Index into futex hash table. |
273 | */ |
273 | */ |
274 | index_t futex_ht_hash(__native *key) |
274 | index_t futex_ht_hash(__native *key) |
275 | { |
275 | { |
276 | return *key & (FUTEX_HT_SIZE-1); |
276 | return *key & (FUTEX_HT_SIZE-1); |
277 | } |
277 | } |
278 | 278 | ||
279 | /** Compare futex hash table item with a key. |
279 | /** Compare futex hash table item with a key. |
280 | * |
280 | * |
281 | * @param key Address where the key (i.e. physical address of futex counter) is stored. |
281 | * @param key Address where the key (i.e. physical address of futex counter) is stored. |
282 | * |
282 | * |
283 | * @return True if the item matches the key. False otherwise. |
283 | * @return True if the item matches the key. False otherwise. |
284 | */ |
284 | */ |
285 | bool futex_ht_compare(__native *key, count_t keys, link_t *item) |
285 | bool futex_ht_compare(__native *key, count_t keys, link_t *item) |
286 | { |
286 | { |
287 | futex_t *futex; |
287 | futex_t *futex; |
288 | 288 | ||
289 | ASSERT(keys == 1); |
289 | ASSERT(keys == 1); |
290 | 290 | ||
291 | futex = hash_table_get_instance(item, futex_t, ht_link); |
291 | futex = hash_table_get_instance(item, futex_t, ht_link); |
292 | return *key == futex->paddr; |
292 | return *key == futex->paddr; |
293 | } |
293 | } |
294 | 294 | ||
295 | /** Callback for removal items from futex hash table. |
295 | /** Callback for removal items from futex hash table. |
296 | * |
296 | * |
297 | * @param item Item removed from the hash table. |
297 | * @param item Item removed from the hash table. |
298 | */ |
298 | */ |
299 | void futex_ht_remove_callback(link_t *item) |
299 | void futex_ht_remove_callback(link_t *item) |
300 | { |
300 | { |
301 | futex_t *futex; |
301 | futex_t *futex; |
302 | 302 | ||
303 | futex = hash_table_get_instance(item, futex_t, ht_link); |
303 | futex = hash_table_get_instance(item, futex_t, ht_link); |
304 | free(futex); |
304 | free(futex); |
305 | } |
305 | } |
306 | 306 | ||
307 | /** Remove references from futexes known to the current task. */ |
307 | /** Remove references from futexes known to the current task. */ |
308 | void futex_cleanup(void) |
308 | void futex_cleanup(void) |
309 | { |
309 | { |
- | 310 | link_t *cur; |
|
- | 311 | ||
- | 312 | rwlock_write_lock(&futex_ht_lock); |
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- | 313 | mutex_lock(&TASK->futexes_lock); |
|
- | 314 | ||
- | 315 | for (cur = TASK->futexes.leaf_head.next; cur != &TASK->futexes.leaf_head; cur = cur->next) { |
|
- | 316 | btree_node_t *node; |
|
- | 317 | int i; |
|
- | 318 | ||
- | 319 | node = list_get_instance(cur, btree_node_t, leaf_link); |
|
- | 320 | for (i = 0; i < node->keys; i++) { |
|
- | 321 | futex_t *ftx; |
|
- | 322 | __address paddr = node->key[i]; |
|
- | 323 | ||
- | 324 | ftx = (futex_t *) node->value[i]; |
|
- | 325 | if (--ftx->refcount == 0) |
|
- | 326 | hash_table_remove(&futex_ht, &paddr, 1); |
|
- | 327 | } |
|
- | 328 | } |
|
- | 329 | ||
- | 330 | mutex_unlock(&TASK->futexes_lock); |
|
- | 331 | rwlock_write_unlock(&futex_ht_lock); |
|
310 | } |
332 | } |
311 | 333 |