Cross Reference: /src/sys/external/bsd/drm2/linux/linux

Lines Matching defs:rwsem
43 #include <linux/rwsem.h>
45 #define	RWSEM_WANTLOCK(RWSEM)						      \
46 	LOCKDEBUG_WANTLOCK((RWSEM)->rws_debug, (RWSEM),			      \
48 #define	RWSEM_LOCKED_EX(RWSEM)						      \
49 	LOCKDEBUG_LOCKED((RWSEM)->rws_debug, (RWSEM), NULL,		      \
51 #define	RWSEM_LOCKED_SH(RWSEM)						      \
52 	LOCKDEBUG_LOCKED((RWSEM)->rws_debug, (RWSEM), NULL,		      \
54 #define	RWSEM_UNLOCKED_EX(RWSEM)					      \
55 	LOCKDEBUG_UNLOCKED((RWSEM)->rws_debug, (RWSEM),			      \
57 #define	RWSEM_UNLOCKED_SH(RWSEM)					      \
58 	LOCKDEBUG_UNLOCKED((RWSEM)->rws_debug, (RWSEM),			      \
65 	const volatile struct rw_semaphore *rwsem = cookie;
67 	pr("%-13s: %p", "writer", rwsem->rws_writer);
68 	pr("%-13s: %u", "readers", rwsem->rws_readers);
69 	pr("%-13s: %s", "writewanted", rwsem->rws_writewanted ? "yes" : "no");
80 init_rwsem(struct rw_semaphore *rwsem)
83 	mutex_init(&rwsem->rws_lock, MUTEX_DEFAULT, IPL_VM);
84 	cv_init(&rwsem->rws_cv, "lnxrwsem");
85 	rwsem->rws_writer = NULL;
86 	rwsem->rws_readers = 0;
89 	rwsem->rws_debug = LOCKDEBUG_ALLOC(rwsem, &rwsem_lockops,
95 destroy_rwsem(struct rw_semaphore *rwsem)
98 	KASSERT(rwsem->rws_readers == 0);
99 	KASSERT(rwsem->rws_writer == NULL);
102 	LOCKDEBUG_FREE(rwsem->rws_debug, rwsem);
105 	cv_destroy(&rwsem->rws_cv);
106 	mutex_destroy(&rwsem->rws_lock);
110 down_read(struct rw_semaphore *rwsem)
113 	RWSEM_WANTLOCK(rwsem);
115 	mutex_enter(&rwsem->rws_lock);
116 	while (rwsem->rws_writer || rwsem->rws_writewanted)
117 		cv_wait(&rwsem->rws_cv, &rwsem->rws_lock);
118 	KASSERT(rwsem->rws_readers < UINT_MAX);
119 	rwsem->rws_readers++;
120 	mutex_exit(&rwsem->rws_lock);
122 	RWSEM_LOCKED_SH(rwsem);
126 down_read_trylock(struct rw_semaphore *rwsem)
138 	mutex_enter(&rwsem->rws_lock);
139 	if (rwsem->rws_writer == NULL && !rwsem->rws_writewanted) {
140 		KASSERT(rwsem->rws_readers < UINT_MAX);
141 		rwsem->rws_readers++;
144 	mutex_exit(&rwsem->rws_lock);
147 		RWSEM_LOCKED_SH(rwsem);
154 up_read(struct rw_semaphore *rwsem)
157 	RWSEM_UNLOCKED_SH(rwsem);
159 	mutex_enter(&rwsem->rws_lock);
160 	KASSERT(rwsem->rws_readers);
161 	KASSERT(rwsem->rws_writer == NULL);
162 	if (--rwsem->rws_readers == 0)
163 		cv_broadcast(&rwsem->rws_cv);
164 	mutex_exit(&rwsem->rws_lock);
168 down_write(struct rw_semaphore *rwsem)
171 	RWSEM_WANTLOCK(rwsem);
173 	mutex_enter(&rwsem->rws_lock);
176 	while (rwsem->rws_writewanted)
177 		cv_wait(&rwsem->rws_cv, &rwsem->rws_lock);
183 	rwsem->rws_writewanted = true;
184 	while (rwsem->rws_writer || rwsem->rws_readers) {
185 		KASSERTMSG(rwsem->rws_writer != curlwp,
186 		    "locking against myself: rwsem=%p lwp=%p", rwsem, curlwp);
187 		cv_wait(&rwsem->rws_cv, &rwsem->rws_lock);
191 	KASSERT(rwsem->rws_readers == 0);
192 	KASSERT(rwsem->rws_writer == NULL);
193 	KASSERT(rwsem->rws_writewanted);
194 	rwsem->rws_writewanted = false;
195 	rwsem->rws_writer = curlwp;
197 	mutex_exit(&rwsem->rws_lock);
199 	RWSEM_LOCKED_EX(rwsem);
203 up_write(struct rw_semaphore *rwsem)
206 	RWSEM_UNLOCKED_EX(rwsem);
208 	mutex_enter(&rwsem->rws_lock);
209 	KASSERT(rwsem->rws_writer == curlwp);
210 	KASSERT(rwsem->rws_readers == 0);
211 	rwsem->rws_writer = NULL;
212 	cv_broadcast(&rwsem->rws_cv);
213 	mutex_exit(&rwsem->rws_lock);
217 downgrade_write(struct rw_semaphore *rwsem)
220 	RWSEM_UNLOCKED_EX(rwsem);
222 	mutex_enter(&rwsem->rws_lock);
223 	KASSERT(rwsem->rws_writer == curlwp);
224 	KASSERT(rwsem->rws_readers == 0);
225 	rwsem->rws_writer = NULL;
226 	rwsem->rws_readers = 1;
227 	cv_broadcast(&rwsem->rws_cv);
228 	mutex_exit(&rwsem->rws_lock);
230 	RWSEM_LOCKED_SH(rwsem);
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