1 /*-
14  *    documentation and/or other materials provided with the distribution.
34 #include "un-namespace.h"
40 	void *key;  member
47 #define	PSHARED_KEY_HASH(key)	(((unsigned long)(key) >> 8) % HASH_SIZE)  argument
48 /* XXXKIB: lock could be split to per-hash chain, if appears contested */
70 	curthread->locklevel++;  in pshared_rlock()
78 	curthread->locklevel++;  in pshared_wlock()
87 	curthread->locklevel--;  in pshared_unlock()
93  * pthread_lock_destroy().  Other processes still have the hash and
94  * mapped off-page.
99  * too time-consuming.
113 			    h->val, NULL);  in pshared_gc()
117 			munmap(h->val, page_size);  in pshared_gc()
125 pshared_lookup(void *key)  in pshared_lookup()  argument
130 	hd = &pshared_hash[PSHARED_KEY_HASH(key)];  in pshared_lookup()
132 		if (h->key == key)  in pshared_lookup()
133 			return (h->val);  in pshared_lookup()
139 pshared_insert(void *key, void **val)  in pshared_insert()  argument
144 	hd = &pshared_hash[PSHARED_KEY_HASH(key)];  in pshared_insert()
147 		 * When the key already exists in the hash, we should  in pshared_insert()
149 		 * val, and the other val should be unmapped to avoid  in pshared_insert()
158 		 * might operate on an unmapped off-page object.  in pshared_insert()
160 		 * There is still an issue: if hashed key was unmapped  in pshared_insert()
161 		 * and then other page is mapped at the same key  in pshared_insert()
167 		if (h->key == key) {  in pshared_insert()
168 			if (h->val != *val) {  in pshared_insert()
170 				*val = h->val;  in pshared_insert()
179 	h->key = key;  in pshared_insert()
180 	h->val = *val;  in pshared_insert()
186 pshared_remove(void *key)  in pshared_remove()  argument
192 	hd = &pshared_hash[PSHARED_KEY_HASH(key)];  in pshared_remove()
194 		if (h->key == key) {  in pshared_remove()
196 			val = h->val;  in pshared_remove()
205 pshared_clean(void *key, void *val)  in pshared_clean()  argument
210 	_umtx_op(NULL, UMTX_OP_SHM, UMTX_SHM_DESTROY, key, NULL);  in pshared_clean()
214 pshared_destroy(struct pthread *curthread, void *key)  in pshared_destroy()  argument
219 	val = pshared_remove(key);  in pshared_destroy()
221 	pshared_clean(key, val);  in pshared_destroy()
225 __thr_pshared_offpage(void *key, int doalloc)  in __thr_pshared_offpage()  argument
233 		pshared_destroy(curthread, key);  in __thr_pshared_offpage()
237 		res = pshared_lookup(key);  in __thr_pshared_offpage()
243 	    UMTX_SHM_LOOKUP, key, NULL);  in __thr_pshared_offpage()
244 	if (fd == -1)  in __thr_pshared_offpage()
251 	ins_done = pshared_insert(key, &res);  in __thr_pshared_offpage()
254 		pshared_clean(key, res);  in __thr_pshared_offpage()
261 __thr_pshared_destroy(void *key)  in __thr_pshared_destroy()  argument
266 	pshared_destroy(curthread, key);  in __thr_pshared_destroy()