sys/kern/kern_mtxpool.c

26 /* Mutex pool routines.  These routines are designed to be used as short
28  * calling msleep()).  They operate using a shared pool.  A mutex is chosen
29  * from the pool based on the supplied pointer (which may or may not be
42  *	- pool/pool dependency ordering cannot be depended on.
59 static MALLOC_DEFINE(M_MTXPOOL, "mtx_pool", "mutex pool");
94  * Return the (shared) pool mutex associated with the specified address.
100 mtx_pool_find(struct mtx_pool *pool, void *ptr)
104 	KASSERT(pool != NULL, ("_mtx_pool_find(): null pool"));
109 	p = ((HASH_MULTIPLIER * (uintptr_t)ptr) >> pool->mtx_pool_shift) &
110 	    pool->mtx_pool_mask;
111 	return (&pool->mtx_pool_ary[p]);
115 mtx_pool_initialize(struct mtx_pool *pool, const char *mtx_name, int pool_size,
120 	pool->mtx_pool_size = pool_size;
121 	pool->mtx_pool_mask = pool_size - 1;
124 	pool->mtx_pool_shift = POINTER_BITS - maskbits;
125 	pool->mtx_pool_next = 0;
127 		mtx_init(&pool->mtx_pool_ary[i], mtx_name, NULL, opts);
133 	struct mtx_pool *pool;
136 		printf("WARNING: %s pool size is not a power of 2.\n",
140 	pool = malloc(sizeof (struct mtx_pool) +
143 	mtx_pool_initialize(pool, mtx_name, pool_size, opts);
144 	return pool;
151 	struct mtx_pool *pool = *poolp;
153 	for (i = pool->mtx_pool_size - 1; i >= 0; --i)
154 		mtx_destroy(&pool->mtx_pool_ary[i]);
155 	free(pool, M_MTXPOOL);
167  * Obtain a (shared) mutex from the pool.  The returned mutex is a leaf
172 mtx_pool_alloc(struct mtx_pool *pool)
176 	KASSERT(pool != NULL, ("mtx_pool_alloc(): null pool"));
182 	i = pool->mtx_pool_next;
183 	pool->mtx_pool_next = (i + 1) & pool->mtx_pool_mask;
184 	return (&pool->mtx_pool_ary[i]);